JPH06331264A - Control device for defrosting showcase - Google Patents

Control device for defrosting showcase

Info

Publication number
JPH06331264A
JPH06331264A JP12439393A JP12439393A JPH06331264A JP H06331264 A JPH06331264 A JP H06331264A JP 12439393 A JP12439393 A JP 12439393A JP 12439393 A JP12439393 A JP 12439393A JP H06331264 A JPH06331264 A JP H06331264A
Authority
JP
Japan
Prior art keywords
refrigerator
time
temperature
evaporator
defrosting
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.)
Granted
Application number
JP12439393A
Other languages
Japanese (ja)
Other versions
JP3313452B2 (en
Inventor
Kenzou Murase
検造 村瀬
Yoshihisa Sasaki
義久 佐々木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanden Corp
Original Assignee
Sanden Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sanden Corp filed Critical Sanden Corp
Priority to JP12439393A priority Critical patent/JP3313452B2/en
Publication of JPH06331264A publication Critical patent/JPH06331264A/en
Application granted granted Critical
Publication of JP3313452B2 publication Critical patent/JP3313452B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Defrosting Systems (AREA)

Abstract

PURPOSE:To obtain a control device for defrosting a showcase which enables completion of defrosting in a short time by electrifying an auxiliary electric heater when the capacity of defrosting is judged to be insufficient by a liquid refrigerant of high temperature and high pressure alone. CONSTITUTION:An auxiliary electric heater 20 is electrified for defrosting when the temperature of a liquid refrigerant detected by a liquid temperature sensor 21 is prescribed temperature or a below in a defrosting operation or when the rate of a drive time of a refrigerator computed by an arithmetic means is a prescribed rate or below or a defrosting operation time measured by a timer 18 amounts to a prescribed time or more or when the temperature of the liquid is low and this causes an insufficiency in defrosting, as is the case in winter, at the time of extinguishment of an illuminating device in a freezing chamber or/when a heat load of a showcase lessens due to the extinguishment of the illumination or the like and this makes the defrosting time longer.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は補助電熱ヒータへの通電
を制御し、蒸発器に付着した霜を短時間で除去できるシ
ョーケースの除霜制御装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defrosting control device for a showcase, which controls energization to an auxiliary electric heater to remove frost attached to an evaporator in a short time.

【０００２】[0002]

【従来の技術】従来、ショーケース、例えばオープンシ
ョーケースでは、庫内の周りに形成された冷風ダクト内
に冷媒が循環する蒸発器を前後に２台設置しており、こ
れらの蒸発器で冷却された冷風を庫内の前面に吹出し庫
内の保冷を行っている。また、この庫内の保冷を継続す
るとき蒸発器に霜が付着成長するため、冷凍機の冷却運
転を所定時間に亘って継続した後にはこの霜を除去する
ようにしている。2. Description of the Related Art Conventionally, in a showcase, for example, an open showcase, two evaporators in which a refrigerant circulates are installed in front and rear in a cool air duct formed around the inside of a refrigerator, and cooling is performed by these evaporators. The cold air is blown to the front of the refrigerator to keep it cool. Further, since frost adheres to and grows on the evaporator when keeping the inside of the refrigerator cool, the frost is removed after the cooling operation of the refrigerator is continued for a predetermined time.

【０００３】この除霜制御装置として、従来、高温高圧
の液冷媒を使用するものが知られている。即ち、圧縮機
から吐出したガス冷媒を凝縮器に流し、この凝縮器から
流れでた液冷媒を除霜すべき一方の蒸発器に循環させ、
更に、この液冷媒を膨張弁を介して他方の蒸発器に流し
ている。これにより、一方の蒸発器がこの高温高圧の液
冷媒により加熱され、この蒸発器に付着した霜が融解す
る一方、他方の蒸発器ではその冷媒の気化熱により庫内
の冷却を継続する。As this defrosting control device, one using a high temperature and high pressure liquid refrigerant has been conventionally known. That is, the gas refrigerant discharged from the compressor is caused to flow into the condenser, and the liquid refrigerant flowing from this condenser is circulated to one evaporator to be defrosted,
Further, this liquid refrigerant is caused to flow to the other evaporator via the expansion valve. As a result, one of the evaporators is heated by the high-temperature and high-pressure liquid refrigerant, and the frost adhering to the evaporator is melted, while the other evaporator continues to cool the inside of the refrigerator by the heat of vaporization of the refrigerant.

【０００４】[0004]

【発明が解決しようとする課題】ところで、オープンシ
ョーケースは夏期はその外気温度が高いため、その液冷
媒の温度も高く、他方、冬期は逆に外気温度が低いため
液冷媒の温度も低くなる。従って、夏期においては液冷
媒による除霜運転に問題はないが、冬期には液冷媒の温
度が低い分その除霜機能が低下し除霜時間が長時間とな
ったり、また、オープンショーケースの熱負荷の減少に
伴い冷凍機の発停が頻繁となり除霜が不完全になるとい
う不具合を起こしていた。By the way, in the open showcase, the temperature of the liquid refrigerant is high in the summer and therefore the temperature of the liquid refrigerant is high. On the other hand, in the winter, the temperature of the liquid refrigerant is also low due to the low outside air temperature. . Therefore, although there is no problem in the defrosting operation with the liquid refrigerant in the summer, the defrosting function is reduced due to the low temperature of the liquid refrigerant in the winter and the defrosting time becomes long, and the open showcase As the heat load decreases, the refrigerator frequently starts and stops, resulting in incomplete defrosting.

【０００５】本発明の目的は前記従来の課題に鑑み、高
温高圧の液冷媒による除霜では能力不足であると判断し
たとき補助電熱ヒータに通電して完全かつ短時間で除霜
できるショーケースの除霜制御装置を提供することにあ
る。In view of the above-mentioned conventional problems, an object of the present invention is to provide a showcase capable of defrosting completely and in a short time by energizing an auxiliary electric heater when it is determined that defrosting with a high-temperature and high-pressure liquid refrigerant is insufficient. It is to provide a defrost control device.

【０００６】[0006]

【課題を解決するための手段】本発明は前記課題を解決
するため、請求項１の発明は、除霜運転時に高温高圧の
液冷媒を蒸発器に循環して該蒸発器に付着成長した霜を
除去するショーケースの除霜制御装置において、前記蒸
発器に付着成長した霜を除去する補助電熱ヒータと、前
記高温高圧の液冷媒の温度を検出する液温度センサと、
前記除霜運転中に該液温度センサの検出信号に基づき該
液冷媒が所定温度以下となったとき該補助電熱ヒータに
通電する制御手段とを備えている。SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a frost which is formed by circulating a high temperature and high pressure liquid refrigerant to an evaporator during defrosting operation and adhering to and growing on the evaporator. In a defrost control device for a showcase that removes, an auxiliary electric heater that removes frost that has adhered and grown on the evaporator, and a liquid temperature sensor that detects the temperature of the high-temperature high-pressure liquid refrigerant,
And a control means for energizing the auxiliary electric heater when the liquid refrigerant becomes a predetermined temperature or lower based on a detection signal of the liquid temperature sensor during the defrosting operation.

【０００７】請求項２の発明は、冷凍機の発停を繰り返
して庫内を冷却するとともに、除霜運転時に高温高圧の
液冷媒を蒸発器に循環して該蒸発器に付着成長した霜を
除去するショーケースの除霜制御装置において、前記蒸
発器に付着成長した霜を除去する補助電熱ヒータと、前
記冷凍機の駆動時間と停止時間との割合を演算する演算
手段と、該演算手段で該冷凍機の駆動時間の割合が所定
割合以下となったとき前記除霜運転において該補助電熱
ヒータに通電する制御手段とを備えている。According to the second aspect of the present invention, the refrigerator is repeatedly started and stopped to cool the inside of the refrigerator, and at the time of the defrosting operation, the high-temperature and high-pressure liquid refrigerant is circulated to the evaporator so that the frost adhered and grown on the evaporator is removed. In a defrost control device for a showcase to be removed, an auxiliary electric heater that removes frost that has adhered and grown on the evaporator, a computing unit that computes a ratio of a drive time and a stop time of the refrigerator, and the computing unit. And a control unit that energizes the auxiliary electric heater in the defrosting operation when the driving time ratio of the refrigerator becomes equal to or lower than a predetermined ratio.

【０００８】請求項３の発明は、除霜運転時に高温高圧
の液冷媒を蒸発器に循環して該蒸発器に付着成長した霜
を除去するショーケースの除霜制御装置において、前記
蒸発器に付着成長した霜を除去する補助電熱ヒータと、
前記除霜運転時間を計数するタイマと、該タイマに基づ
き該除霜運転時間が所定時間以上となったとき該補助電
熱ヒータに通電する制御手段とを備えている。According to a third aspect of the present invention, in the defrost control device for a showcase, the high-temperature and high-pressure liquid refrigerant is circulated to the evaporator during the defrosting operation to remove the frost adhered and grown on the evaporator. An auxiliary electric heater that removes the frost that has adhered and grown,
A timer for counting the defrosting operation time and a control means for energizing the auxiliary electric heater when the defrosting operation time becomes a predetermined time or more based on the timer.

【０００９】請求項４の発明は、除霜運転時に高温高圧
の液冷媒を蒸発器に循環して該蒸発器に付着成長した霜
を除去するショーケースの除霜制御装置において、前記
蒸発器に付着成長した霜を除去する補助電熱ヒータと、
庫内の照明装置を消灯したとき該補助電熱ヒータに通電
する制御手段とを備えている。According to a fourth aspect of the present invention, in the defrost control device for a showcase, the high-temperature and high-pressure liquid refrigerant is circulated to the evaporator during the defrosting operation to remove the frost adhering to and grown on the evaporator. An auxiliary electric heater that removes the frost that has adhered and grown,
And a control means for energizing the auxiliary electric heater when the lighting device in the refrigerator is turned off.

【００１０】請求項５の発明は、請求項１の液温度セン
サと請求項２の演算手段とを備え、除霜運転中に液冷媒
が所定温度以下となるか、又は、冷凍機の駆動時間の割
合が所定割合以下となったとき補助電熱ヒータに通電す
る制御手段を有している。According to a fifth aspect of the present invention, the liquid temperature sensor according to the first aspect and the calculating means according to the second aspect are provided, and the liquid refrigerant is kept at a predetermined temperature or lower during the defrosting operation, or the driving time of the refrigerator. Has a control means for energizing the auxiliary electric heater when the ratio becomes less than a predetermined ratio.

【００１１】請求項６の発明は、請求項１の液温度セン
サと請求項３のタイマとを備え、除霜運転中に液冷媒が
所定温度以下となるか、又は、除霜運転時間が所定時間
以上となったとき補助電熱ヒータに通電する制御手段を
有している。According to a sixth aspect of the present invention, the liquid temperature sensor according to the first aspect and the timer according to the third aspect are provided, and the liquid refrigerant has a predetermined temperature or lower during the defrosting operation, or a predetermined defrosting operation time. It has a control means for energizing the auxiliary electric heater when the time is exceeded.

【００１２】請求項７の発明は、請求項１の液温度セン
サと請求項４の照明装置とを備え、除霜運転中に液冷媒
が所定温度以下となるか、又は、庫内の照明装置を消灯
したとき補助電熱ヒータに通電する制御手段を有してい
る。According to a seventh aspect of the present invention, the liquid temperature sensor according to the first aspect and the illuminating device according to the fourth aspect are provided, and the liquid refrigerant has a predetermined temperature or lower during the defrosting operation, or the illuminating device in the refrigerator. It has a control means for energizing the auxiliary electric heater when is turned off.

【００１３】請求項８の発明は、請求項２の演算手段と
請求項３のタイマとを備え、冷凍機の駆動時間の割合が
所定割合以下となるか、又は、除霜運転時間が所定時間
以上となったとき補助電熱ヒータに通電する制御手段を
有している。The invention of claim 8 is provided with the calculating means of claim 2 and the timer of claim 3, wherein the ratio of the driving time of the refrigerator is equal to or less than a predetermined ratio, or the defrosting operation time is a predetermined time. It has a control means to energize the auxiliary electric heater when the above is reached.

【００１４】請求項９の発明は、請求項２の演算手段と
請求項４の照明装置とを備え、冷凍機の駆動時間の割合
が所定割合以下となるか、又は、庫内の照明装置を消灯
したとき補助電熱ヒータに通電する制御手段を有してい
る。According to a ninth aspect of the present invention, the invention is provided with the calculating means of the second aspect and the illuminating device of the fourth aspect, and the ratio of the driving time of the refrigerator is equal to or less than a predetermined ratio, or the illuminating device in the refrigerator is It has a control means for energizing the auxiliary electric heater when it is turned off.

【００１５】請求項１０の発明は、請求項３のタイマと
請求項４の照明装置とを備え、除霜運転時間が所定時間
以上となるか、又は、庫内の照明装置を消灯したとき補
助電熱ヒータに通電する制御手段を有している。The invention of claim 10 comprises the timer of claim 3 and the illuminating device of claim 4, and assists when the defrosting operation time is a predetermined time or more, or when the illuminating device in the refrigerator is turned off. It has a control means for energizing the electric heater.

【００１６】請求項１１の発明は、請求項１の液温度セ
ンサと請求項２の演算手段と請求項３のタイマとを備
え、除霜運転中に液冷媒が所定温度以下となるか、冷凍
機の駆動時間の割合が所定割合以下となるか、又は、除
霜運転時間が所定時間以上となったとき補助電熱ヒータ
に通電する制御手段を有している。According to an eleventh aspect of the present invention, the liquid temperature sensor according to the first aspect, the calculating means according to the second aspect, and the timer according to the third aspect are provided. It has a control means for energizing the auxiliary electric heater when the ratio of the driving time of the machine becomes a predetermined ratio or less or when the defrosting operation time becomes a predetermined time or more.

【００１７】請求項１２の発明は、請求項１の液温度セ
ンサと請求項２の演算手段と請求項４の照明装置とを備
え、除霜運転中に液冷媒が所定温度以下となるか、冷凍
機の駆動時間の割合が所定割合以下となるか、又は、庫
内の照明装置を消灯したとき補助電熱ヒータに通電する
制御手段を有している。According to a twelfth aspect of the present invention, the liquid temperature sensor according to the first aspect, the calculating means according to the second aspect, and the illuminating device according to the fourth aspect are provided, and whether the liquid refrigerant has a predetermined temperature or lower during the defrosting operation, It has a control means for energizing the auxiliary electric heater when the ratio of the driving time of the refrigerator is equal to or less than a predetermined ratio or when the lighting device in the refrigerator is turned off.

【００１８】請求項１３の発明は、請求項１の液温度セ
ンサと請求項３のタイマと請求項４の照明装置とを備
え、除霜運転中に液冷媒が所定温度以下となるか、除霜
運転時間が所定時間以上となるか、又は、庫内の照明装
置を消灯したとき補助電熱ヒータに通電する制御手段を
有している。According to a thirteenth aspect of the present invention, the liquid temperature sensor according to the first aspect, the timer according to the third aspect, and the lighting device according to the fourth aspect are provided. It has a control means for energizing the auxiliary electric heater when the frost operation time is longer than a predetermined time or when the lighting device in the refrigerator is turned off.

【００１９】請求項１４の発明は、請求項２の演算手段
と請求項３のタイマと請求項４の照明装置とを備え、冷
凍機の駆動時間の割合が所定割合以下となるか、除霜運
転時間が所定時間以上となるか、又は、庫内の照明装置
を消灯したとき補助電熱ヒータに通電する制御手段を有
している。According to a fourteenth aspect of the present invention, the calculation means according to the second aspect, the timer according to the third aspect, and the illumination device according to the fourth aspect are provided, and the ratio of the driving time of the refrigerator is equal to or less than a predetermined ratio, or the defrosting is performed. It has a control means for energizing the auxiliary electric heater when the operating time exceeds a predetermined time or when the lighting device in the refrigerator is turned off.

【００２０】請求項１５の発明は、請求項１の液温度セ
ンサと請求項２の演算手段と請求項３のタイマと請求項
４の照明装置とを備え、除霜運転中に液冷媒が所定温度
以下となるか、冷凍機の駆動時間の割合が所定割合以下
となるか、除霜運転時間が所定時間以上となるか、又
は、庫内の照明装置を消灯したとき補助電熱ヒータに通
電する制御手段を有している。According to a fifteenth aspect of the present invention, the liquid temperature sensor according to the first aspect, the calculating means according to the second aspect, the timer according to the third aspect, and the illumination device according to the fourth aspect are provided, and the liquid refrigerant is kept at a predetermined level during the defrosting operation. If the temperature is lower than or equal to, the ratio of the driving time of the refrigerator is equal to or lower than a predetermined ratio, the defrosting operation time is equal to or longer than a predetermined time, or the auxiliary electric heater is energized when the lighting device in the refrigerator is turned off. It has a control means.

【００２１】[0021]

【作用】請求項１の発明によれば、液温度センサの検出
信号に基づき液冷媒が所定温度以下となったとき、即ち
冬期の如く液温度が低く除霜不足を起こすおそれのある
とき、補助電熱ヒータに通電する。これにより、この補
助電熱ヒータの熱により短時間でかつ完全に除霜され
る。According to the first aspect of the invention, when the temperature of the liquid refrigerant is lower than a predetermined temperature based on the detection signal of the liquid temperature sensor, that is, when the liquid temperature is low and defrosting may be insufficient as in the winter season, the auxiliary Energize the electric heater. As a result, the heat of the auxiliary electric heater is used to completely defrost in a short time.

【００２２】請求項２の発明によれば、演算手段で冷凍
機の駆動時間の割合が所定割合以下となったとき、即ち
ショーケースの熱負荷が減少し冷凍機の駆動時間が短く
なったとき、補助電熱ヒータに通電する。これにより、
短時間でかつ完全に除霜する。According to the invention of claim 2, when the ratio of the driving time of the refrigerator becomes less than a predetermined ratio by the calculating means, that is, when the heat load of the showcase is reduced and the driving time of the refrigerator is shortened. , Energize the auxiliary electric heater. This allows
Defrost quickly and completely.

【００２３】請求項３の発明によれば、タイマに基づき
除霜運転時間が所定時間以上となったとき、即ち液冷媒
の温度の低下等で除霜時間が長くなったとき、補助電熱
ヒータに通電する。これにより、除霜時間の遅延を防止
する。According to the third aspect of the invention, when the defrosting operation time becomes longer than a predetermined time based on the timer, that is, when the defrosting time becomes long due to a decrease in the temperature of the liquid refrigerant, the auxiliary electric heater is provided. Energize. This prevents the defrosting time from being delayed.

【００２４】請求項４の発明によれば、庫内の照明装置
を消灯したとき、即ち照明装置の消灯により庫内の熱負
荷が減少し冷凍機の駆動時間が短くなったとき、補助電
熱ヒータに通電する。これにより、短時間でかつ完全に
除霜する。According to the fourth aspect of the present invention, when the lighting device in the refrigerator is turned off, that is, when the lighting device is turned off, the heat load in the refrigerator is reduced and the driving time of the refrigerator is shortened. Energize. As a result, defrosting is completed in a short time.

【００２５】請求項５の発明によれば、除霜運転中に液
冷媒が所定温度以下となったり、また、冷凍機の駆動時
間の割合が所定割合以下となったとき、即ち冬期の如く
液温度が低く除霜不足を起こすおそれがあり、また、シ
ョーケースの熱負荷が減少し冷凍機の駆動時間が短くな
ったとき、補助電熱ヒータに通電し除霜を行う。According to the invention of claim 5, when the temperature of the liquid refrigerant is lower than a predetermined temperature during the defrosting operation or when the ratio of the driving time of the refrigerator is lower than the predetermined ratio, that is, as in the winter season, the liquid refrigerant is cooled. When the temperature is low and defrosting may be insufficient, and when the heat load on the showcase is reduced and the driving time of the refrigerator is shortened, the auxiliary electric heater is energized for defrosting.

【００２６】請求項６の発明によれば、除霜運転中に液
冷媒が所定温度以下となり、また、除霜運転時間が所定
時間以上となったとき、即ち冬期の如く液温度が低く除
霜不足を起こし除霜時間が長くなるとき、補助電熱ヒー
タに通電し除霜を行う。According to the invention of claim 6, when the liquid refrigerant is below a predetermined temperature during the defrosting operation and when the defrosting operation time is above a predetermined time, that is, the liquid temperature is low and the defrosting is performed as in the winter season. When a shortage occurs and the defrosting time becomes long, the auxiliary electric heater is energized to defrost.

【００２７】請求項７の発明によれば、除霜運転中に液
冷媒が所定温度以下となったり、また、庫内の照明装置
を消灯したとき、即ち冬期の如く液温度が低く除霜不足
を起こし、また、照明装置の消灯により庫内の熱負荷が
減少したとき、補助電熱ヒータに通電し除霜を行う。According to the invention of claim 7, when the liquid refrigerant is below a predetermined temperature during the defrosting operation, or when the lighting device in the refrigerator is turned off, that is, in the winter season, the liquid temperature is low and defrosting is insufficient. In addition, when the lighting device is turned off and the heat load in the refrigerator is reduced, the auxiliary electric heater is energized to defrost.

【００２８】請求項８の発明によれば、冷凍機の駆動時
間の割合が所定割合以下となったり、また、除霜運転時
間が所定時間以上となったとき、即ちショーケースの熱
負荷が減少し冷凍機の駆動時間が短くなり除霜時間が長
くなるとき、補助電熱ヒータに通電し除霜を行う。According to the invention of claim 8, when the ratio of the driving time of the refrigerator is less than a predetermined ratio or when the defrosting operation time is more than a predetermined time, that is, the heat load of the showcase is reduced. When the driving time of the refrigerator becomes short and the defrosting time becomes long, the auxiliary electric heater is energized for defrosting.

【００２９】請求項９の発明によれば、冷凍機の駆動時
間の割合が所定割合以下となったり、また、庫内の照明
装置を消灯したとき、即ち店舗の閉店等で照明を消しシ
ョーケースの熱負荷が減少したとき、補助電熱ヒータに
通電し除霜を行う。According to the ninth aspect of the present invention, the driving time of the refrigerator is less than a predetermined ratio, or when the lighting device in the refrigerator is turned off, that is, when the store is closed, the lighting is turned off and the showcase is turned on. When the heat load of is reduced, the auxiliary electric heater is energized to defrost.

【００３０】請求項１０の発明によれば、除霜運転時間
が所定時間以上となったり、また、庫内の照明装置を消
灯したとき、即ち照明の消灯等によりショーケース内の
熱負荷が減少する一方、除霜時間が長くなるとき、補助
電熱ヒータに通電し除霜を行う。According to the tenth aspect of the invention, the heat load in the showcase is reduced when the defrosting operation time is longer than a predetermined time or when the lighting device in the refrigerator is turned off, that is, when the lighting is turned off. On the other hand, when the defrosting time becomes long, the auxiliary electric heater is energized to defrost.

【００３１】請求項１１の発明によれば、除霜運転中に
液冷媒が所定温度以下となったり、冷凍機の駆動時間の
割合が所定割合以下となったり、また、除霜運転時間が
所定時間以上となったとき、即ち外気温度の低下及びシ
ョーケース内の熱負荷の減少等により除霜時間が長くな
ったとき、補助電熱ヒータに通電し除霜を行う。According to the invention of claim 11, during the defrosting operation, the temperature of the liquid refrigerant becomes a predetermined temperature or lower, the ratio of the driving time of the refrigerator becomes a predetermined ratio or lower, and the defrosting operation time becomes a predetermined value. When the time exceeds the time, that is, when the defrosting time becomes long due to a decrease in outside air temperature and a decrease in heat load in the showcase, the auxiliary electric heater is energized to perform defrosting.

【００３２】請求項１２の発明によれば、除霜運転中に
液冷媒が所定温度以下となったり、冷凍機の駆動時間の
割合が所定割合以下となったり、また、庫内の照明装置
を消灯したとき、即ち外気温度の低下及びショーケース
内の熱負荷の減少したとき、補助電熱ヒータに通電し除
霜を行う。According to the twelfth aspect of the present invention, during the defrosting operation, the temperature of the liquid refrigerant becomes a predetermined temperature or lower, the ratio of the driving time of the refrigerator becomes a predetermined ratio or lower, and the lighting device in the refrigerator is When the light is turned off, that is, when the outside air temperature decreases and the heat load in the showcase decreases, the auxiliary electric heater is energized to defrost.

【００３３】請求項１３の発明によれば、除霜運転中に
液冷媒が所定温度以下となったり、除霜運転時間が所定
時間以上となったり、また、庫内の照明装置を消灯した
とき、即ち外気温度の低下及びショーケース内の熱負荷
の減少等により除霜時間が長くなったとき、補助電熱ヒ
ータに通電し除霜を行う。According to the thirteenth aspect of the present invention, during the defrosting operation, the temperature of the liquid refrigerant becomes lower than a predetermined temperature, the defrosting operation time becomes longer than a predetermined time, and the lighting device in the refrigerator is turned off. That is, when the defrosting time becomes long due to a decrease in the outside air temperature and a decrease in the heat load in the showcase, the auxiliary electric heater is energized for defrosting.

【００３４】請求項１４の発明によれば、冷凍機の駆動
時間の割合が所定割合以下となったり、除霜運転時間が
所定時間以上となったり、また、庫内の照明装置を消灯
したとき、即ち冬期の如く液温度が低く除霜不足を起こ
し、また、照明の消灯によりショーケースの熱負荷が減
少し除霜時間が長くなるとき、補助電熱ヒータに通電し
除霜する。According to the fourteenth aspect of the present invention, when the driving time ratio of the refrigerator is less than a predetermined ratio, the defrosting operation time is more than a predetermined time, or when the lighting device in the refrigerator is turned off. That is, when the liquid temperature is low and defrosting is insufficient as in the winter season, and when the heat load on the showcase is reduced and the defrosting time is lengthened by turning off the light, the auxiliary electric heater is energized for defrosting.

【００３５】請求項１５の発明によれば、除霜運転中に
液冷媒が所定温度以下となったり、冷凍機の駆動時間の
割合が所定割合以下となったり、除霜運転時間が所定時
間以上となったり、また、庫内の照明装置を消灯したと
き、即ち冬期の如く液温度が低く除霜不足を起こし、ま
た、照明の消灯等によりショーケースの熱負荷が減少し
除霜時間が長くなるとき、補助電熱ヒータに通電し除霜
を行う。According to the fifteenth aspect of the present invention, during the defrosting operation, the temperature of the liquid refrigerant becomes lower than a predetermined temperature, the ratio of the driving time of the refrigerator becomes a predetermined ratio or lower, and the defrosting operation time becomes a predetermined time or longer. In addition, when the lighting device inside the refrigerator is turned off, that is, when the liquid temperature is low and defrosting is insufficient like in the winter, the heat load on the showcase is reduced due to the turning off of the light and the defrosting time is long. Then, the auxiliary electric heater is energized to defrost.

【００３６】[0036]

【実施例】図１乃至図３は本発明に係る除霜制御装置が
適用されるオープンショーケースを示すもので、図１は
オープンショーケースを示す断面図、図２の(a)(b)はオ
ープンショーケースの同時冷却運転を示す冷媒回路図及
び風回路図、図３の(a)(b)はオープンショーケースの片
側除霜運転を示す冷媒回路図及び風回路図である。1 to 3 show an open showcase to which a defrost control device according to the present invention is applied. FIG. 1 is a sectional view showing the open showcase, and FIGS. 3A and 3B are a refrigerant circuit diagram and a wind circuit diagram showing the simultaneous cooling operation of the open showcase, and FIGS. 3A and 3B are a refrigerant circuit diagram and a wind circuit diagram showing the one-side defrosting operation of the open showcase.

【００３７】このオープンショーケース１はその前面を
開口してなり、庫内２には商品を展示販売する棚３が上
下に複数設置されている。この棚３に載せられた商品、
例えば野菜、精肉等を照明するため各棚３及びオープン
ショーケース１の上部に照明装置である蛍光灯４が設置
されている。The open showcase 1 has an opening on the front surface thereof, and a plurality of shelves 3 for exhibiting and selling products are installed in the interior 2 at the top and bottom. Products placed on this shelf 3,
For example, in order to illuminate vegetables, meat, etc., a fluorescent lamp 4 which is a lighting device is installed above each shelf 3 and the open showcase 1.

【００３８】また、この庫内２を保冷するため、庫内２
の周りに上下に延びる冷風ダクト５が形成され、この背
面側の冷風ダクト５には前後に仕切板６を介して２台の
冷凍機の蒸発器７ａ，７ｂが設置されている。ここで、
前側の蒸発器７ａは冷媒が相互に連通する状態で上下に
分離されている。また、この各蒸発器７ａ，７ｂの上方
には一方又は双方の蒸発器７ａ，７ｂへの風の流通を制
御するダンパ８が設置されている。この各蒸発器７ａ，
７ｂには冷却用の冷媒が循環しており、送風機９で送風
される空気を冷却し、この冷却された空気を冷風ダクト
５の上部からオープンショーケース１の前面開口に沿っ
て下方に吹出すとともに、更に冷風ダクト５の下部から
この空気を吸い込み（いわゆるエアーカーテン）、庫内
保冷のための冷気循環を構成している（図１の１点鎖線
矢印）。In order to keep the inside 2 cold, the inside 2
A cold air duct 5 extending vertically is formed around, and two evaporators 7a and 7b of the refrigerator are installed in front and rear of the cold air duct 5 on the back side via a partition plate 6. here,
The front evaporator 7a is vertically separated so that the refrigerants communicate with each other. A damper 8 for controlling the flow of air to one or both of the evaporators 7a and 7b is installed above each of the evaporators 7a and 7b. Each of these evaporators 7a,
Refrigerant for cooling is circulated in 7b to cool the air blown by the blower 9 and blow the cooled air downward from the upper part of the cool air duct 5 along the front opening of the open showcase 1. At the same time, this air is further sucked in from the lower part of the cold air duct 5 (so-called air curtain) to form a cold air circulation for keeping cold in the refrigerator (one-dot chain line arrow in FIG. 1).

【００３９】この冷気循環において、蒸発器７ａ，７ｂ
には霜が付着成長するため、庫内２の冷却運転を所定時
間継続した後には片側除霜運転を交互に行い蒸発器７
ａ，７ｂの霜を融解する。In this cold air circulation, evaporators 7a, 7b
Since frost adheres to and grows on the evaporator 7, after the cooling operation of the inside 2 is continued for a predetermined time, the one-side defrosting operation is alternately performed.
Thaw the frost of a and 7b.

【００４０】このような庫内の冷却運転及び片側除霜運
転は図２の(a)(b)及び図３の(a)(b)に示す冷媒回路で行
われ、その冷媒回路の構成をこれらの図を参照して説明
する。The cooling operation and the one-side defrosting operation in the refrigerator are performed in the refrigerant circuit shown in FIGS. 2 (a) and (b) and FIGS. 3 (a) and 3 (b). Description will be made with reference to these figures.

【００４１】即ち、１０は圧縮機、１１は凝縮器、１２
ａ，１２ｂは膨張弁、１３ａ，１３ｂは四方弁、１４
ａ，１４ｂ，１４ｃは電磁弁、１５ａ，１５ｂは逆止弁
である。ここで、各蒸発器７ａ，７ｂを冷却用に使用す
る同時冷却運転を行うときは、圧縮機１０の冷媒が、図
２の(a)の実線矢印に示すように、凝縮器１１→電磁弁
１４ａ→電磁弁１４ｂ→各膨張弁１２ａ，１２ｂ→各蒸
発器７ａ，７ｂ→各四方弁１３ａ，１３ｂ→圧縮機１０
と順次循環する。ここで、ダンパ８は図２の(b)に示す
ように、各蒸発器７ａ，７ｂの双方に空気が流れるよう
垂直に回転規制され、各蒸発器７ａ，７ｂを通る空気を
冷却し、庫内２の保冷を行っている。That is, 10 is a compressor, 11 is a condenser, and 12
a, 12b are expansion valves, 13a, 13b are four-way valves, 14
Reference numerals a, 14b and 14c are solenoid valves, and 15a and 15b are check valves. Here, when performing the simultaneous cooling operation in which each of the evaporators 7a and 7b is used for cooling, the refrigerant of the compressor 10 is changed from the condenser 11 to the solenoid valve as shown by the solid arrow in (a) of FIG. 14a → solenoid valve 14b → expansion valves 12a, 12b → evaporators 7a, 7b → four-way valves 13a, 13b → compressor 10
And cycle in sequence. Here, as shown in FIG. 2B, the damper 8 is vertically regulated so that air flows through both of the evaporators 7a and 7b, cools the air passing through the evaporators 7a and 7b, and I keep 2 of them cold.

【００４２】他方、前側の蒸発器７ａを除霜し、後側の
蒸発器７ｂを冷却運転する片側除霜運転においては、図
３の(a)に実線矢印に示すように冷媒を循環させる。即
ち、圧縮機１０の冷媒は凝縮器１１→電磁弁１４ａ→四
方弁１３ａ→前側の蒸発器７ａ→逆止弁１５ａ→電磁弁
１４ｃ→膨張弁１２ｂ→後側の蒸発器７ｂ→四方弁１３
ｂ→圧縮機１０と順次循環する。ここで、ダンパ８は図
３の(b)の実線矢印で示すように前側の蒸発器７ａ内の
空気の流通を規制し、この蒸発器７ａ内の除霜熱が庫内
２に流れ込まないようにしている。On the other hand, in the one-side defrosting operation in which the front side evaporator 7a is defrosted and the rear side evaporator 7b is cooled, the refrigerant is circulated as indicated by the solid arrow in FIG. That is, the refrigerant of the compressor 10 is the condenser 11 → the solenoid valve 14a → the four-way valve 13a → the front evaporator 7a → the check valve 15a → the solenoid valve 14c → the expansion valve 12b → the rear evaporator 7b → the four-way valve 13
b-> The compressor 10 is sequentially circulated. Here, the damper 8 regulates the flow of air in the evaporator 7a on the front side so that the defrosting heat in the evaporator 7a does not flow into the inside 2 as shown by the solid arrow in (b) of FIG. I have to.

【００４３】また、これとは逆に後側の蒸発器７ｂを除
霜し、前側の蒸発器７ｂを冷却運転する片側除霜運転に
おいては、図３の(a)に１点鎖線矢印に示すように、圧
縮機１０の冷媒は凝縮器１１→電磁弁１４ａ→四方弁１
３ｂ→後側の蒸発器７ｂ→逆止弁１５ｂ→電磁弁１４ｃ
→膨張弁１２ａ→前側の蒸発器７ａ→四方弁１３ａ→圧
縮機１０と順次循環する。ここで、ダンパ８は図３の
(b)の１点鎖線矢印で示すように後側の蒸発器７ｂ内の
空気の流通を規制し、この蒸発器７ｂ内の除霜熱が庫内
２に流れ込まないようにしている。On the contrary, in the one-side defrosting operation in which the rear evaporator 7b is defrosted and the front evaporator 7b is cooled, the one-dot chain line arrow in FIG. As described above, the refrigerant of the compressor 10 is the condenser 11 → the solenoid valve 14a → the four-way valve 1
3b-> rear evaporator 7b-> check valve 15b-> solenoid valve 14c
-> Expansion valve 12a-> Front side evaporator 7a-> Four-way valve 13a-> Compressor 10 is sequentially circulated. Here, the damper 8 is shown in FIG.
As indicated by the one-dot chain line arrow in (b), the circulation of air in the rear evaporator 7b is regulated so that the defrosting heat in the evaporator 7b does not flow into the inside 2.

【００４４】このように、片側除霜運転では除霜すべき
一方の蒸発器７ａ又は７ｂに凝縮器１１からの高温高圧
の液冷媒を循環させ蒸発器７ａ又は７ｂに付着成長した
霜を除去している。As described above, in the one-side defrosting operation, the high-temperature and high-pressure liquid refrigerant from the condenser 11 is circulated through the one evaporator 7a or 7b to be defrosted to remove the frost adhered and grown on the evaporator 7a or 7b. ing.

【００４５】この冷却運転は庫内２の温度を検出する図
１に示す庫内温度センサ１６の検出信号に基づき冷凍機
をオンオフ制御して庫内を保冷する。他方、片側除霜運
転はその駆動開始時がＣＰＵ１７のタイマ１８で制御さ
れ、例えば同時冷却運転が２５分間継続した時に開始さ
れるよう設定され、また、その運転終了時は蒸発器７
ａ，７ｂの温度を検出する蒸発器温度センサ１９で除霜
終了温度に達したときに停止するようになっている。In this cooling operation, the refrigerator is turned on / off based on the detection signal of the inside temperature sensor 16 shown in FIG. 1 for detecting the temperature of the inside 2 to keep the inside of the refrigerator cool. On the other hand, the one-side defrosting operation is controlled by the timer 18 of the CPU 17 at the start of driving, and is set to be started, for example, when the simultaneous cooling operation is continued for 25 minutes.
The evaporator temperature sensor 19 for detecting the temperatures a and 7b stops when the defrosting end temperature is reached.

【００４６】このような冷却運転及び片側除霜運転は従
来例と同様であり、本発明はこの各蒸発器７ａ，７ｂに
除霜用の補助電熱ヒータ（以下、ヒータという）２０を
図１に示すように各蒸発器７ａ，７ｂの下方に設置し、
除霜に不具合を生ずる事態となったとき、ヒータ２０に
通電することを特徴とするものであり、以下その各実施
例に係る除霜制御装置を説明する。The cooling operation and the one-side defrosting operation are the same as those in the conventional example. In the present invention, an auxiliary electric heater (hereinafter referred to as a heater) 20 for defrosting is provided in each of the evaporators 7a and 7b as shown in FIG. Installed under each evaporator 7a, 7b as shown,
The present invention is characterized in that the heater 20 is energized when a problem occurs in defrosting, and the defrosting control device according to each embodiment will be described below.

【００４７】（実施例１）図４の(a)(b)は実施例１に係
る除霜制御装置の制御ブロック図及び制御フローチャー
トを示すものである。図４の(a)に示すように、蒸発器
温度センサ１９の検出信号と、凝縮器１１から吐出され
た液冷媒の温度を検出する液温度センサ２１（図２及び
図３に示す）の検出信号に基づき制御するもので、これ
らの信号からＣＰＵ１７が補助電熱ヒータ駆動回路（以
下、ヒータ駆動回路という）２２を介してヒータ２０を
駆動制御している。(Embodiment 1) FIGS. 4A and 4B are a control block diagram and a control flowchart of the defrosting control apparatus according to Embodiment 1. As shown in FIG. As shown in FIG. 4A, the detection signal of the evaporator temperature sensor 19 and the detection of the liquid temperature sensor 21 (shown in FIGS. 2 and 3) for detecting the temperature of the liquid refrigerant discharged from the condenser 11 are detected. Control is performed based on signals, and the CPU 17 drives and controls the heater 20 from these signals via an auxiliary electric heater drive circuit (hereinafter referred to as a heater drive circuit) 22.

【００４８】即ち、前述したようにタイマ１８及び蒸発
器温度センサ１９の検出信号に基づいて、まず、除霜す
べき一方の蒸発器７ａ又は７ｂが片側除霜運転されてい
るか否かを判断し（Ｓ１）、片側除霜運転がされている
ときは、液温度センサ２１の検出信号に基づき液温度ｔ
１が２０℃以下となっているかを判断する（Ｓ２）。こ
こで、液温度ｔ１が２０℃以下となっているとき、即ち
冬期の如く外気温度が低くこれに伴い液冷媒の温度が低
くなり、除霜に適さない状態となったときは、ヒータ２
０に通電しこの除霜を補助する（Ｓ３）。これにより、
短時間で完全な除霜が行われる。That is, as described above, based on the detection signals from the timer 18 and the evaporator temperature sensor 19, first, it is determined whether or not one of the evaporators 7a or 7b to be defrosted is in the one-side defrosting operation. (S1), when the one-side defrosting operation is being performed, the liquid temperature t based on the detection signal of the liquid temperature sensor 21.
It is determined whether 1 is 20 ° C. or lower (S2). Here, when the liquid temperature t1 is 20 ° C. or lower, that is, when the outside air temperature is low as in winter and the temperature of the liquid refrigerant is lowered accordingly, and it is not suitable for defrosting, the heater 2
0 is energized to assist this defrosting (S3). This allows
Complete defrosting takes place in a short time.

【００４９】このような除霜が継続し、蒸発器温度セン
サ１９の検出信号に基づき蒸発器温度ｔ２が除霜完了温
度１０℃以上となったときは、ヒータ２０への通電を停
止する。また、除霜経過時間Ｔが５時間以上となっても
蒸発器温度ｔ２が１０℃以下とならないときは、強制的
に通電を停止し片側除霜運転を停止する（Ｓ４〜Ｓ
６）。ここで、このような片側除霜運転を停止させる制
御、即ちステップ４〜６を、以下、片側除霜停止制御と
いう。When such defrosting continues, and when the evaporator temperature t2 becomes equal to or higher than the defrosting completion temperature of 10 ° C. based on the detection signal of the evaporator temperature sensor 19, the energization of the heater 20 is stopped. If the evaporator temperature t2 does not fall below 10 ° C even if the defrost elapsed time T exceeds 5 hours, the energization is forcibly stopped and the one-side defrost operation is stopped (S4 to S).
6). Here, the control for stopping the one-side defrosting operation, that is, steps 4 to 6 will be referred to as one-side defrosting stop control hereinafter.

【００５０】（実施例２）図５の(a)(b)は実施例２に係
る除霜制御装置の制御ブロック図及び制御フローチャー
トを示すものである。図５の(a)に示すように、蒸発器
温度センサ１９の検出信号と、庫内温度センサ１６の検
出信号に基づき、ＣＰＵ１７がヒータ駆動回路２２を介
してヒータ２０を駆動制御している。(Second Embodiment) FIGS. 5A and 5B are a control block diagram and a control flowchart of a defrosting control apparatus according to the second embodiment. As shown in FIG. 5A, the CPU 17 drives and controls the heater 20 via the heater driving circuit 22 based on the detection signal of the evaporator temperature sensor 19 and the detection signal of the internal temperature sensor 16.

【００５１】即ち、前述したように片側除霜運転がされ
ているか否かを判断し（Ｓ１）、ここで、片側除霜運転
がされているときは、庫内温度センサ１６の検出信号に
基づき冷凍機が運転中か否かを判断する（Ｓ２）。ここ
で、庫内温度センサ１６が庫内上限温度を検出したとき
は冷凍機が駆動し、他方、この冷凍機の運転で庫内下限
温度を検出したときは冷凍機が停止するため、この庫内
温度センサ１６に基づき冷凍機が運転中か否かを検出で
きる。That is, as described above, it is determined whether the one-side defrosting operation is being performed (S1). Here, when the one-side defrosting operation is being performed, based on the detection signal of the internal temperature sensor 16, It is determined whether the refrigerator is operating (S2). Here, when the inside temperature sensor 16 detects the upper limit temperature inside the refrigerator, the refrigerator is driven. On the other hand, when the lower limit temperature inside the refrigerator is detected during operation of this refrigerator, the refrigerator stops. Based on the internal temperature sensor 16, it is possible to detect whether or not the refrigerator is in operation.

【００５２】このステップ２で冷凍機が停止していると
きは、その後の冷凍機の発停（１サイクル）のオン時間
ＴONとオフ時間ＴOFFとをタイマ１８で計測し、更に、
このオン時間ＴONが１サイクル時間の例えば半分以下と
なっているか否かを演算する（Ｓ３，Ｓ４）。ここで、
オン時間ＴONが１サイクル時間の半分以下となっている
とき、即ち庫内２の熱負荷が減少し冷凍機の駆動時間が
短くなっているときは、ヒータ２０に通電しこの除霜を
補助する（Ｓ５）。これにより、短時間で完全な除霜が
行われる。なお、その後の片側除霜停止制御については
前記実施例１と同様である。When the refrigerator is stopped in step 2, the timer 18 measures the on-time TON and the off-time TOFF when the refrigerator is started and stopped (one cycle) thereafter.
It is calculated whether this ON time TON is, for example, half or less of one cycle time (S3, S4). here,
When the ON time TON is less than half of one cycle time, that is, when the heat load in the refrigerator 2 is reduced and the driving time of the refrigerator is shortened, the heater 20 is energized to assist this defrosting. (S5). As a result, complete defrosting is performed in a short time. The subsequent one-side defrost stop control is the same as in the first embodiment.

【００５３】（実施例３）図６の(a)(b)は実施例３に係
る除霜制御装置の制御ブロック図及び制御フローチャー
トを示すものである。図６の(a)に示すように、蒸発器
温度センサ１９の検出信号に基づきＣＰＵ１７がヒータ
駆動回路２２を介してヒータ２０を駆動制御している。(Third Embodiment) FIGS. 6 (a) and 6 (b) are a control block diagram and a control flowchart of a defrosting control apparatus according to the third embodiment. As shown in FIG. 6A, the CPU 17 drives and controls the heater 20 via the heater drive circuit 22 based on the detection signal of the evaporator temperature sensor 19.

【００５４】即ち、前述したように片側除霜運転がされ
ているか否かを判断し（Ｓ１）、片側除霜運転がされて
いるときは、片側除霜運転の経過時間Ｔが１時間以上と
なっているか否かを判断する（Ｓ２）。ここで、経過時
間Ｔが１時間以上となっているとき、即ち除霜時間が長
くなっているときはヒータ２０に通電しこの除霜を補助
する（Ｓ３）。これにより、除霜時間の長期化を防止し
ている。なお、その後の片側除霜停止制御については前
記実施例１と同様である。That is, as described above, it is determined whether the one-side defrosting operation is being performed (S1). When the one-side defrosting operation is being performed, the elapsed time T of the one-side defrosting operation is 1 hour or more. It is determined whether or not (S2). Here, when the elapsed time T is 1 hour or more, that is, when the defrosting time is long, the heater 20 is energized to assist the defrosting (S3). This prevents the defrosting time from being lengthened. The subsequent one-side defrost stop control is the same as in the first embodiment.

【００５５】（実施例４）図７の(a)(b)は実施例４に係
る除霜制御装置の制御ブロック図及び制御フローチャー
トを示すものである。図７の(a)に示すように、蒸発器
温度センサ１９の検出信号と、蛍光灯４の照明スイッチ
２３のオンオフ信号に基づきＣＰＵ１７がヒータ駆動回
路２２を介してヒータ２０を駆動制御している。(Fourth Embodiment) FIGS. 7A and 7B are a control block diagram and a control flowchart of a defrosting control device according to the fourth embodiment. As shown in FIG. 7A, the CPU 17 drives and controls the heater 20 via the heater drive circuit 22 based on the detection signal of the evaporator temperature sensor 19 and the on / off signal of the illumination switch 23 of the fluorescent lamp 4. .

【００５６】即ち、前述したように片側除霜運転がされ
ているか否かを判断し（Ｓ１）、片側除霜運転がされて
いるときは、照明スイッチ２３がオンしているか否かを
判断する（Ｓ２）。ここで、照明スイッチ２３がオフし
ているとき、即ちショーケースの庫内照明が消灯され庫
内２の熱負荷が減少したときはヒータ２０に通電しこの
除霜を補助する（Ｓ３）。これにより、短時間で完全な
除霜が行われる。なお、その後の片側除霜停止制御につ
いては前記実施例１と同様である。That is, as described above, it is determined whether the one-side defrosting operation is being performed (S1), and when the one-side defrosting operation is being performed, it is determined whether or not the lighting switch 23 is turned on. (S2). Here, when the lighting switch 23 is off, that is, when the interior lighting of the showcase is turned off and the heat load in the interior 2 is reduced, the heater 20 is energized to assist this defrosting (S3). As a result, complete defrosting is performed in a short time. The subsequent one-side defrost stop control is the same as in the first embodiment.

【００５７】（実施例５）図８の(a)(b)は実施例５に係
る除霜制御装置の制御ブロック図及び制御フローチャー
トを示すものである。図８の(a)に示すように、液冷媒
の温度を検出する液温度センサ２１の検出信号と、蒸発
器温度センサ１９の検出信号と、庫内温度センサ１６の
検出信号に基づきＣＰＵ１７がヒータ駆動回路２２を介
してヒータ２０を駆動制御している。(Fifth Embodiment) FIGS. 8A and 8B are a control block diagram and a control flowchart of a defrost control device according to the fifth embodiment. As shown in (a) of FIG. 8, the CPU 17 controls the heater based on the detection signal of the liquid temperature sensor 21 that detects the temperature of the liquid refrigerant, the detection signal of the evaporator temperature sensor 19, and the detection signal of the internal temperature sensor 16. The heater 20 is drive-controlled via the drive circuit 22.

【００５８】即ち、前述したように片側除霜運転がされ
ているか否かを判断し（Ｓ１）、ここで、片側除霜運転
がされているときは、前記実施例２と同様に冷凍機が運
転中か否かを判断し、冷凍機が停止しているときは、冷
凍機のオン時間ＴONとオフ時間ＴOFFとをタイマ１８で
計測し、更に、このオン時間ＴONが１サイクル時間の例
えば半分以下となっているか否かを演算する（Ｓ２，Ｓ
３，Ｓ４）。ここで、オン時間ＴONが１サイクル時間の
例えば半分以下となっているときは、ヒータ２０に通電
しこの除霜を補助する（Ｓ５）。That is, as described above, it is determined whether the one-side defrosting operation is being performed (S1). Here, when the one-side defrosting operation is being performed, the refrigerator is operated as in the second embodiment. When it is determined whether or not the refrigerator is operating, when the refrigerator is stopped, the ON time TON and the OFF time TOFF of the refrigerator are measured by the timer 18, and the ON time TON is, for example, half of one cycle time. It is calculated whether or not (S2, S
3, S4). Here, when the ON time TON is, for example, half or less of one cycle time, the heater 20 is energized to assist this defrosting (S5).

【００５９】このような除霜制御において、本実施例で
はステップ２で冷凍機が運転中のとき、及び、オン時間
ＴONが１サイクル時間の例えば半分より長いときは、液
冷媒の温度が２０℃以下となっているかを判断する（Ｓ
６）。ここで、液温度ｔ１が２０℃以下となっていると
き、即ち冬期の如く外気温度が低くこれに伴い液冷媒の
温度が低くなり、除霜に適さない状態となったときはス
テップ５に戻ってヒータ２０に通電する。In such defrosting control, in the present embodiment, when the refrigerator is operating in step 2 and when the ON time TON is longer than, for example, half of one cycle time, the temperature of the liquid refrigerant is 20 ° C. It is judged whether it is below (S
6). Here, when the liquid temperature t1 is 20 ° C. or lower, that is, when the outside air temperature is low like in winter and the temperature of the liquid refrigerant decreases accordingly, and the state becomes unsuitable for defrosting, the process returns to step 5. To energize the heater 20.

【００６０】このように、本実施例では、冷凍機の運転
割合と液冷媒の温度の両者からヒータ２０を制御してい
る。なお、片側除霜停止制御については前記実施例１と
同様である。As described above, in this embodiment, the heater 20 is controlled based on both the operating ratio of the refrigerator and the temperature of the liquid refrigerant. The one-side defrost stop control is the same as in the first embodiment.

【００６１】（実施例６）図９の(a)(b)は実施例６に係
る除霜制御装置の制御ブロック図及び制御フローチャー
トを示すものである。図９の(a)に示すように、液温度
センサ２１の検出信号と、蒸発器温度センサ１９の検出
信号に基づきＣＰＵ１７がヒータ駆動回路２２を介して
ヒータ２０を駆動制御している。(Sixth Embodiment) FIGS. 9A and 9B are a control block diagram and a control flowchart of a defrost control device according to the sixth embodiment. As shown in FIG. 9A, the CPU 17 drives and controls the heater 20 via the heater drive circuit 22 based on the detection signal of the liquid temperature sensor 21 and the detection signal of the evaporator temperature sensor 19.

【００６２】即ち、前述したように片側除霜運転がされ
ているか否かを判断し（Ｓ１）、ここで、片側除霜運転
がされているときは、前記実施例１と同様に、液冷媒の
温度ｔ１が２０℃以上となっているか否かを判断し（Ｓ
２）、この温度以下のときはヒータ２０に通電しこの除
霜を補助する（Ｓ３）。That is, as described above, it is determined whether the one-side defrosting operation is being performed (S1). Here, when the one-side defrosting operation is being performed, the liquid refrigerant is used as in the first embodiment. It is judged whether or not the temperature t1 of is above 20 ° C (S
2) When the temperature is lower than this temperature, the heater 20 is energized to assist the defrosting (S3).

【００６３】このような除霜制御において、ステップ２
で液冷媒の温度ｔ１が２０℃以上となっているときは、
片側除霜運転の経過時間Ｔが１時間以上となっているか
否かを判断する（Ｓ４）。ここで、経過時間Ｔが１時間
以上となっているとき、即ち除霜時間が長くなっている
ときはステップ３に戻ってヒータ２０に通電する。In such defrosting control, step 2
When the temperature t1 of the liquid refrigerant is 20 ° C. or higher,
It is determined whether the elapsed time T of the one-side defrosting operation is one hour or more (S4). Here, when the elapsed time T is 1 hour or more, that is, when the defrosting time is long, the process returns to step 3 and the heater 20 is energized.

【００６４】このように本実施例では液冷媒温度と除霜
時間の両者でヒータ２０への通電を制御し、除霜時間の
長期化を防止している。なお、片側除霜停止制御につい
ては前記実施例１と同様である。As described above, in this embodiment, the energization of the heater 20 is controlled by both the liquid refrigerant temperature and the defrosting time to prevent the defrosting time from being prolonged. The one-side defrost stop control is the same as in the first embodiment.

【００６５】（実施例７）図１０の(a)(b)は実施例７に
係る除霜制御装置の制御ブロック図及び制御フローチャ
ートを示すものである。図１０の(a)に示すように、液
温度センサ２１の検出信号と、照明スイッチ２３のオン
オフ信号と、蒸発器温度センサ１９の検出信号に基づき
ＣＰＵ１７がヒータ駆動回路２２を介してヒータ２０を
駆動制御している。(Embodiment 7) FIGS. 10 (a) and 10 (b) are a control block diagram and a control flowchart of a defrosting control apparatus according to Embodiment 7, respectively. As shown in (a) of FIG. 10, the CPU 17 controls the heater 20 via the heater drive circuit 22 based on the detection signal of the liquid temperature sensor 21, the on / off signal of the lighting switch 23, and the detection signal of the evaporator temperature sensor 19. The drive is controlled.

【００６６】即ち、前述したように片側除霜運転がされ
ているか否かを判断し（Ｓ１）、ここで、片側除霜運転
がされているときは、前記実施例１と同様に、液冷媒の
温度ｔ１が２０℃以上となっているか否かを判断し（Ｓ
２）、この温度以下のときはヒータ２０に通電しこの除
霜を補助する（Ｓ３）。That is, it is determined whether the one-side defrosting operation is being performed as described above (S1). Here, when the one-side defrosting operation is being performed, the liquid refrigerant is used as in the first embodiment. It is judged whether or not the temperature t1 of is above 20 ° C (S
2) When the temperature is lower than this temperature, the heater 20 is energized to assist the defrosting (S3).

【００６７】このような除霜制御において、ステップ２
で液冷媒の温度ｔ１が２０℃以上となっているときは、
照明スイッチ２３がオンしているか否かを判断する（Ｓ
４）。ここで、照明スイッチ２３がオフしているとき、
即ち庫内２の熱負荷が減少しているときはステップ３に
戻ってヒータ２０に通電する。In such defrost control, step 2
When the temperature t1 of the liquid refrigerant is 20 ° C. or higher,
It is determined whether or not the lighting switch 23 is turned on (S
4). Here, when the lighting switch 23 is off,
That is, when the heat load of the inside 2 is decreasing, the process returns to step 3 and the heater 20 is energized.

【００６８】このように本実施例では液冷媒温度と蛍光
灯４の点灯及び消灯の両者でヒータ２０への通電を制御
し、短時間で完全な除霜を行う。なお、片側除霜停止制
御については前記実施例１と同様である。As described above, in this embodiment, the energization of the heater 20 is controlled by both the temperature of the liquid refrigerant and the turning on and off of the fluorescent lamp 4 to perform complete defrosting in a short time. The one-side defrost stop control is the same as in the first embodiment.

【００６９】（実施例８）図１１の(a)(b)は実施例８に
係る除霜制御装置の制御ブロック図及び制御フローチャ
ートを示すものである。図１１の(a)に示すように、蒸
発器温度センサ１９の検出信号と、庫内温度センサ１６
の検出信号に基づきＣＰＵ１７がヒータ駆動回路２２を
介してヒータ２０を駆動制御している。(Embodiment 8) FIGS. 11 (a) and 11 (b) are a control block diagram and a control flow chart of the defrosting control apparatus according to the eighth embodiment. As shown in (a) of FIG. 11, the detection signal of the evaporator temperature sensor 19 and the inside temperature sensor 16
The CPU 17 drives and controls the heater 20 via the heater drive circuit 22 based on the detection signal of.

【００７０】即ち、前述したように片側除霜運転がされ
ているか否かを判断し（Ｓ１）、ここで、片側除霜運転
がされているときは、前記実施例２と同様に冷凍機が運
転中か否かを判断し、冷凍機が停止しているときは、冷
凍機のオン時間ＴONとオフ時間ＴOFFとをタイマ１８で
計測し、更に、このオン時間ＴONが１サイクル時間の例
えば半分以下となっているか否かを演算する（Ｓ２，Ｓ
３，Ｓ４）。ここで、オン時間ＴONが１サイクル時間の
例えば半分以下となっているときは、ヒータ２０に通電
しこの除霜を補助する（Ｓ５）。That is, as described above, it is determined whether or not the one-side defrosting operation is being performed (S1). Here, when the one-side defrosting operation is being performed, the refrigerator is operated as in the second embodiment. When it is determined whether or not the refrigerator is operating, when the refrigerator is stopped, the ON time TON and the OFF time TOFF of the refrigerator are measured by the timer 18, and the ON time TON is, for example, half of one cycle time. It is calculated whether or not (S2, S
3, S4). Here, when the ON time TON is, for example, half or less of one cycle time, the heater 20 is energized to assist this defrosting (S5).

【００７１】このような除霜制御において、本実施例で
はステップ２で冷凍機が運転されているとき、及び、オ
ン時間ＴONが１サイクル時間の例えば半分より長いとき
は、片側除霜運転の経過時間Ｔが１時間以上となってい
るか否かを判断する（Ｓ６）。ここで、経過時間Ｔが１
時間以上となっているとき、即ち除霜時間が長くなって
いるときはステップ５に戻ってヒータ２０に通電する。In such defrosting control, in this embodiment, when the refrigerator is operated in step 2 and when the ON time TON is longer than, for example, half of one cycle time, the one-sided defrosting operation progresses. It is determined whether the time T is one hour or more (S6). Here, the elapsed time T is 1
When the time is longer than the time, that is, when the defrosting time is long, the process returns to step 5 and the heater 20 is energized.

【００７２】このように、本実施例では、冷凍機の運転
割合と除霜経過時間の両者からヒータ２０への通電を制
御している。なお、片側除霜停止制御については前記実
施例１と同様である。As described above, in this embodiment, the energization of the heater 20 is controlled from both the operating ratio of the refrigerator and the defrosting elapsed time. The one-side defrost stop control is the same as in the first embodiment.

【００７３】（実施例９）図１２の(a)(b)は実施例９に
係る除霜制御装置の制御ブロック図及び制御フローチャ
ートを示すものである。図１２の(a)に示すように、蒸
発器温度センサ１９の検出信号と、照明スイッチ２３の
オンオフ信号と、庫内温度センサ１６の検出信号に基づ
きＣＰＵ１７がヒータ駆動回路２２を介してヒータ２０
を駆動制御している。(Ninth Embodiment) FIGS. 12 (a) and 12 (b) are a control block diagram and a control flowchart of a defrosting control apparatus according to the ninth embodiment. As shown in (a) of FIG. 12, the CPU 17 causes the heater 20 via the heater drive circuit 22 based on the detection signal of the evaporator temperature sensor 19, the ON / OFF signal of the lighting switch 23, and the detection signal of the internal temperature sensor 16.
Drive control.

【００７４】即ち、前述したように片側除霜運転がされ
ているか否かを判断し（Ｓ１）、ここで、片側除霜運転
がされているときは、前記実施例２と同様に冷凍機が運
転中か否かを判断し、冷凍機が停止しているときは、冷
凍機のオン時間ＴONとオフ時間ＴOFFとをタイマ１８で
計測し、更に、このオン時間ＴONが１サイクル時間の例
えば半分以下となっているか否かを演算する（Ｓ２，Ｓ
３，Ｓ４）。ここで、オン時間ＴONが１サイクル時間の
例えば半分以下となっているときは、ヒータ２０に通電
しこの除霜を補助する（Ｓ５）。That is, as described above, it is determined whether the one-side defrosting operation is being performed (S1). Here, when the one-side defrosting operation is being performed, the refrigerator is operated as in the second embodiment. When it is determined whether or not the refrigerator is operating, when the refrigerator is stopped, the ON time TON and the OFF time TOFF of the refrigerator are measured by the timer 18, and the ON time TON is, for example, half of one cycle time. It is calculated whether or not (S2, S
3, S4). Here, when the ON time TON is, for example, half or less of one cycle time, the heater 20 is energized to assist this defrosting (S5).

【００７５】このような除霜制御において、本実施例で
はステップ２で冷凍機が運転しているとき、及び、オン
時間ＴONが１サイクル時間の例えば半分より長いとき
は、照明スイッチ２３がオンしているか否かを判断する
（Ｓ６）。ここで、照明スイッチ２３がオフしていると
き、即ち庫内２の熱負荷が減少しているときはステップ
５に戻ってヒータ２０に通電する。In such defrosting control, in this embodiment, the illumination switch 23 is turned on when the refrigerator is operating in step 2 and when the ON time TON is longer than, for example, half of one cycle time. It is determined whether or not (S6). Here, when the lighting switch 23 is off, that is, when the heat load of the inside 2 is decreasing, the process returns to step 5 and the heater 20 is energized.

【００７６】このように、本実施例では、冷凍機の運転
割合と蛍光灯４の点灯及び消灯の両者からヒータ２０へ
の通電を制御している。なお、片側除霜停止制御につい
ては前記実施例１と同様である。As described above, in this embodiment, the energization of the heater 20 is controlled from both the operating ratio of the refrigerator and both turning on and off the fluorescent lamp 4. The one-side defrost stop control is the same as in the first embodiment.

【００７７】（実施例１０）図１３の(a)(b)は実施例１
０に係る除霜制御装置の制御ブロック図及び制御フロー
チャートを示すものである。図１３の(a)に示すよう
に、蒸発器温度センサ１９の検出信号と、蛍光灯４の照
明スイッチ２３のオンオフ信号に基づきＣＰＵ１７がヒ
ータ駆動回路２２を介してヒータ２０を駆動制御してい
る。(Embodiment 10) FIGS. 13A and 13B show Embodiment 1
The control block diagram and control flowchart of the defrost control apparatus concerning 0 are shown. As shown in FIG. 13A, the CPU 17 drives and controls the heater 20 via the heater drive circuit 22 based on the detection signal of the evaporator temperature sensor 19 and the ON / OFF signal of the illumination switch 23 of the fluorescent lamp 4. .

【００７８】即ち、前述したように片側除霜運転がされ
ているか否かを判断し（Ｓ１）、ここで、片側除霜運転
がされているときは、前記実施例４で説明したように、
照明スイッチ２３がオンしているか否かを判断し（Ｓ
２）、ここで、照明スイッチ２３がオフしているときは
ヒータ２０に通電しこの除霜を補助する（Ｓ３）。That is, it is determined whether the one-side defrosting operation is performed as described above (S1). When the one-side defrosting operation is performed, as described in the fourth embodiment,
It is determined whether or not the lighting switch 23 is turned on (S
2) Here, when the illumination switch 23 is off, the heater 20 is energized to assist in this defrosting (S3).

【００７９】このような除霜制御において、本実施例で
はステップ２で照明スイッチ２３がオンしているときで
も、その除霜経過時間Ｔが１時間以上となっているとき
は、除霜不足になっているとしてステップ３に戻り、ヒ
ータ２０に通電する。In such defrosting control, in this embodiment, even when the illumination switch 23 is turned on in step 2, when the defrosting elapsed time T is 1 hour or more, defrosting is insufficient. If so, the process returns to step 3 and the heater 20 is energized.

【００８０】このように、本実施例では、除霜時間と蛍
光灯４の点灯及び消灯の両者からヒータ２０への通電を
制御している。なお、片側除霜停止制御については前記
実施例１と同様である。As described above, in this embodiment, the energization to the heater 20 is controlled from both the defrosting time and the turning on and off of the fluorescent lamp 4. The one-side defrost stop control is the same as in the first embodiment.

【００８１】（実施例１１）図１４の(a)(b)は実施例１
１に係る除霜制御装置の制御ブロック図及び制御フロー
チャートを示すものである。図１４の(a)に示すよう
に、液温度センサ２１の検出信号と、蒸発器温度センサ
１９の検出信号と、庫内温度センサ１６の検出信号に基
づきＣＰＵ１７がヒータ駆動回路２２を介してヒータ２
０を駆動制御している。(Embodiment 11) FIGS. 14 (a) and 14 (b) show Embodiment 1
2 is a control block diagram and a control flowchart of the defrost control device according to the first embodiment. As shown in (a) of FIG. 14, the CPU 17 causes the heater driving circuit 22 to drive the heater based on the detection signal of the liquid temperature sensor 21, the detection signal of the evaporator temperature sensor 19, and the detection signal of the internal temperature sensor 16. Two
0 is drive-controlled.

【００８２】即ち、前述したように片側除霜運転がされ
ているか否かを判断し（Ｓ１）、ここで、片側除霜運転
がされているときは、前記実施例２と同様に冷凍機が運
転中か否かを判断し、冷凍機が停止しているときは、冷
凍機のオン時間ＴONとオフ時間ＴOFFとをタイマ１８で
計測し、更に、このオン時間ＴONが１サイクル時間の例
えば半分以下となっているか否かを演算する（Ｓ２，Ｓ
３，Ｓ４）。ここで、オン時間ＴONが１サイクル時間の
例えば半分以下となっているときは、ヒータ２０に通電
しこの除霜を補助する（Ｓ５）。That is, as described above, it is determined whether the one-side defrosting operation is being performed (S1). Here, when the one-side defrosting operation is being performed, the refrigerator is operated as in the second embodiment. When it is determined whether or not the refrigerator is operating, when the refrigerator is stopped, the ON time TON and the OFF time TOFF of the refrigerator are measured by the timer 18, and the ON time TON is, for example, half of one cycle time. It is calculated whether or not (S2, S
3, S4). Here, when the ON time TON is, for example, half or less of one cycle time, the heater 20 is energized to assist this defrosting (S5).

【００８３】このような除霜制御において、本実施例で
はステップ２で冷凍機が運転されているとき、及び、オ
ン時間ＴONが１サイクル時間の例えば半分より長いとき
は、液冷媒の温度ｔ１が２０℃以上となっているか、ま
た、除霜経過時間Ｔが１時間以上となっているかを判断
する（Ｓ６，Ｓ７）。ここで、液冷媒の温度ｔ１が２０
℃より低いとき、また、この温度ｔ１が２０℃以上であ
っても除霜経過時間Ｔが１時間以上となっているとき
は、ステップ５に戻ってヒータ２０に通電する。In such defrosting control, in this embodiment, when the refrigerator is operated in step 2 and when the ON time TON is longer than, for example, half of one cycle time, the temperature t1 of the liquid refrigerant is It is determined whether the temperature is 20 ° C. or higher and the defrost elapsed time T is 1 hour or longer (S6, S7). Here, the temperature t1 of the liquid refrigerant is 20
When the temperature is lower than 0 ° C., or when the defrosting elapsed time T is 1 hour or longer even when the temperature t1 is 20 ° C. or higher, the process returns to step 5 and the heater 20 is energized.

【００８４】このように、本実施例では、冷凍機の運転
割合、液温度、更には除霜時間の３者からヒータ２０へ
の通電を制御している。なお、片側除霜停止制御につい
ては前記実施例１と同様である。As described above, in this embodiment, the energization of the heater 20 is controlled by the three factors of the operation ratio of the refrigerator, the liquid temperature, and the defrosting time. The one-side defrost stop control is the same as in the first embodiment.

【００８５】（実施例１２）図１５の(a)(b)は実施例１
２に係る除霜制御装置の制御ブロック図及び制御フロー
チャートを示すものである。図１５の(a)に示すよう
に、液温度センサ２１の検出信号と、照明スイッチ２３
のオンオフ信号と、蒸発器温度センサ１９の検出信号
と、庫内温度センサ１６の検出信号に基づきＣＰＵ１７
がヒータ駆動回路２２を介してヒータ２０を駆動制御し
ている。(Embodiment 12) FIGS. 15 (a) and 15 (b) show Embodiment 1
3 is a control block diagram and a control flowchart of the defrosting control device according to the second embodiment. As shown in (a) of FIG. 15, the detection signal of the liquid temperature sensor 21 and the illumination switch 23
Based on the ON / OFF signal of the, the detection signal of the evaporator temperature sensor 19, and the detection signal of the internal temperature sensor 16.
Controls the heater 20 via the heater drive circuit 22.

【００８６】即ち、前述したように片側除霜運転がされ
ているか否かを判断し（Ｓ１）、ここで、片側除霜運転
がされているときは、前記実施例２と同様に冷凍機が運
転中か否かを判断し、冷凍機が停止しているときは、冷
凍機のオン時間ＴONとオフ時間ＴOFFとをタイマ１８で
計測し、更に、このオン時間ＴONが１サイクル時間の例
えば半分以下となっているか否かを演算する（Ｓ２，Ｓ
３，Ｓ４）。ここで、オン時間ＴONが１サイクル時間の
例えば半分以下となっているときは、ヒータ２０に通電
しこの除霜を補助する（Ｓ５）。That is, it is determined whether the one-side defrosting operation is being performed as described above (S1). Here, when the one-side defrosting operation is being performed, the refrigerator is operated as in the second embodiment. When it is determined whether or not the refrigerator is operating, when the refrigerator is stopped, the ON time TON and the OFF time TOFF of the refrigerator are measured by the timer 18, and the ON time TON is, for example, half of one cycle time. It is calculated whether or not (S2, S
3, S4). Here, when the ON time TON is, for example, half or less of one cycle time, the heater 20 is energized to assist this defrosting (S5).

【００８７】このような除霜制御において、本実施例で
はステップ２で冷凍機が運転されているとき、及び、オ
ン時間ＴONが１サイクル時間の例えば半分より長いとき
は、液冷媒の温度ｔ１が２０℃以上となっているか、ま
た、照明スイッチ２３がオンしているかを判断する（Ｓ
６，Ｓ７）。ここで、液冷媒の温度ｔ１が２０℃より低
いとき、また、この温度ｔ１が２０℃以上であっても照
明スイッチ２３がオフしているときは、ステップ５に戻
ってヒータ２０に通電する。In such defrosting control, in this embodiment, when the refrigerator is operated in step 2 and when the ON time TON is longer than, for example, half of one cycle time, the temperature t1 of the liquid refrigerant is It is determined whether the temperature is 20 ° C. or higher, and whether the lighting switch 23 is turned on (S
6, S7). Here, when the temperature t1 of the liquid refrigerant is lower than 20 ° C., or when the lighting switch 23 is off even when the temperature t1 is 20 ° C. or higher, the process returns to step 5 and the heater 20 is energized.

【００８８】このように、本実施例では、冷凍機の運転
割合、液温度、更には蛍光灯４の点灯及び消灯の３者か
らヒータ２０への通電を制御している。なお、片側除霜
停止制御については前記実施例１と同様である。As described above, in the present embodiment, the operation ratio of the refrigerator, the liquid temperature, and the energization of the heater 20 from the three persons of turning on and off the fluorescent lamp 4 are controlled. The one-side defrost stop control is the same as in the first embodiment.

【００８９】（実施例１３）図１６の(a)(b)は実施例１
３に係る除霜制御装置の制御ブロック図及び制御フロー
チャートを示すものである。図１６の(a)に示すよう
に、液温度センサ２１の検出信号と、照明スイッチ２３
のオンオフ信号と、蒸発器温度センサ１９の検出信号に
基づきＣＰＵ１７がヒータ駆動回路２２を介してヒータ
２０を駆動制御している。(Embodiment 13) FIGS. 16 (a) and 16 (b) show Embodiment 1
3 is a control block diagram and a control flowchart of a defrost control device according to No. 3. As shown in (a) of FIG. 16, the detection signal of the liquid temperature sensor 21 and the illumination switch 23
The CPU 17 drives and controls the heater 20 via the heater drive circuit 22 based on the ON / OFF signal of the above and the detection signal of the evaporator temperature sensor 19.

【００９０】即ち、前述したように片側除霜運転がされ
ているか否かを判断し（Ｓ１）、ここで、片側除霜運転
がされているときは、前記実施例１と同様に、液冷媒の
温度ｔ１が２０℃以上となっているか否かを判断し（Ｓ
２）、この温度以下のときはヒータ２０に通電しこの除
霜を補助する（Ｓ３）。That is, it is determined whether the one-side defrosting operation is performed as described above (S1). Here, when the one-side defrosting operation is performed, the liquid refrigerant is used as in the first embodiment. It is judged whether or not the temperature t1 of is above 20 ° C (S
2) When the temperature is lower than this temperature, the heater 20 is energized to assist the defrosting (S3).

【００９１】このような除霜制御において、ステップ２
で液冷媒の温度ｔ１が２０℃以上となっているときは、
照明スイッチ２３がオンしているか、また、除霜経過時
間Ｔが１時間以上となっているかを判断する（Ｓ４，Ｓ
５）。ここで、照明スイッチ２３がオフしているとき、
また、照明スイッチ２３がオンしているときでも、除霜
経過時間Ｔが１時間以上となっているときはステップ３
に戻ってヒータ２０に通電する。In such defrost control, step 2
When the temperature t1 of the liquid refrigerant is 20 ° C. or higher,
It is determined whether the lighting switch 23 is turned on and whether the defrosting elapsed time T is 1 hour or more (S4, S
5). Here, when the lighting switch 23 is off,
Even when the lighting switch 23 is turned on, if the defrost elapsed time T is 1 hour or more, step 3
Then, the heater 20 is energized.

【００９２】このように本実施例では液冷媒温度と、蛍
光灯４の点灯及び消灯と、除霜時間の３両者でヒータ２
０への通電を制御している。なお、片側除霜停止制御に
ついては前記実施例１と同様である。As described above, in this embodiment, the heater 2 is controlled by the liquid refrigerant temperature, the lighting and extinguishing of the fluorescent lamp 4, and the defrosting time.
The energization to 0 is controlled. The one-side defrost stop control is the same as in the first embodiment.

【００９３】（実施例１４）図１７の(a)(b)は実施例１
４に係る除霜制御装置の制御ブロック図及び制御フロー
チャートを示すものである。図１７の(a)に示すよう
に、照明スイッチ２３のオンオフ信号と、蒸発器温度セ
ンサ１９の検出信号と、庫内温度センサ１６の検出信号
に基づきＣＰＵ１７がヒータ駆動回路２２を介してヒー
タ２０を駆動制御している。(Embodiment 14) FIGS. 17 (a) and 17 (b) show Embodiment 1
4 is a control block diagram and a control flowchart of the defrost control device according to No. 4 of the present invention. As shown in (a) of FIG. 17, the CPU 17 causes the heater 20 to drive the heater 20 via the heater drive circuit 22 based on the ON / OFF signal of the lighting switch 23, the detection signal of the evaporator temperature sensor 19, and the detection signal of the internal temperature sensor 16. Drive control.

【００９４】即ち、前述したように片側除霜運転がされ
ているか否かを判断し（Ｓ１）、ここで、片側除霜運転
がされているときは、前記実施例２と同様に冷凍機が運
転中か否かを判断し、冷凍機が停止しているときは、冷
凍機のオン時間ＴONとオフ時間ＴOFFとをタイマ１８で
計測し、更に、このオン時間ＴONが１サイクル時間の例
えば半分以下となっているか否かを演算する（Ｓ２，Ｓ
３，Ｓ４）。ここで、オン時間ＴONが１サイクル時間の
例えば半分以下となっているときは、ヒータ２０に通電
しこの除霜を補助する（Ｓ５）。That is, it is determined whether or not the one-side defrosting operation is performed as described above (S1). Here, when the one-side defrosting operation is performed, the refrigerator is operated as in the second embodiment. When it is determined whether or not the refrigerator is operating, when the refrigerator is stopped, the ON time TON and the OFF time TOFF of the refrigerator are measured by the timer 18, and the ON time TON is, for example, half of one cycle time. It is calculated whether or not (S2, S
3, S4). Here, when the ON time TON is, for example, half or less of one cycle time, the heater 20 is energized to assist this defrosting (S5).

【００９５】このような除霜制御において、本実施例で
はステップ２で冷凍機が停止しているとき、及び、オン
時間ＴONが１サイクル時間の例えば半分より長いとき
は、液照明スイッチ２３がオンしているか、また、除霜
経過時間Ｔが１時間以上となっているかを判断する（Ｓ
６，Ｓ７）。ここで、照明スイッチ２３がオフしている
とき、また、この照明スイッチ２３がオンしているとき
であっても除霜経過時間Ｔが１時間以上となっていると
きは、ステップ５に戻ってヒータ２０に通電する。In such defrosting control, in this embodiment, the liquid lighting switch 23 is turned on when the refrigerator is stopped in step 2 and when the on-time TON is longer than, for example, half of one cycle time. Whether or not the defrost elapsed time T is 1 hour or more (S
6, S7). Here, when the illumination switch 23 is off, or when the defrost elapsed time T is 1 hour or more even when the illumination switch 23 is on, the process returns to step 5. Energize the heater 20.

【００９６】このように、本実施例では、冷凍機の運転
割合、蛍光灯４の点灯及び消灯、更には除霜時間の３者
からヒータ２０への通電を制御している。なお、片側除
霜停止制御については前記実施例１と同様である。As described above, in this embodiment, the operation ratio of the refrigerator, the lighting and extinguishing of the fluorescent lamp 4, and the energization of the heater 20 by the three persons during the defrosting time are controlled. The one-side defrost stop control is the same as in the first embodiment.

【００９７】（実施例１５）図１８の(a)(b)は実施例１
５に係る除霜制御装置の制御ブロック図及び制御フロー
チャートを示すものである。図１８の(a)に示すよう
に、液温度センサ２１の検出信号と、照明スイッチ２３
のオンオフ信号と、蒸発器温度センサ１９の検出信号
と、庫内温度センサ１６の検出信号に基づきＣＰＵ１７
がヒータ駆動回路２２を介してヒータ２０を駆動制御し
ている。(Embodiment 15) FIGS. 18 (a) and 18 (b) show Embodiment 1
6 is a control block diagram and a control flowchart of the defrost control device according to No. 5. As shown in FIG. 18A, the detection signal of the liquid temperature sensor 21 and the illumination switch 23
Based on the ON / OFF signal of the, the detection signal of the evaporator temperature sensor 19, and the detection signal of the internal temperature sensor 16.
Controls the heater 20 via the heater drive circuit 22.

【００９８】即ち、前述したように片側除霜運転がされ
ているか否かを判断し（Ｓ１）、ここで、片側除霜運転
がされているときは、前記実施例２と同様に冷凍機が運
転中か否かを判断し、冷凍機が停止しているときは、冷
凍機のオン時間ＴONとオフ時間ＴOFFとをタイマ１８で
計測し、更に、このオン時間ＴONが１サイクル時間の例
えば半分以下となっているか否かを演算する（Ｓ２，Ｓ
３，Ｓ４）。ここで、オン時間ＴONが１サイクル時間の
例えば半分以下となっているときは、ヒータ２０に通電
しこの除霜を補助する（Ｓ５）。That is, it is determined whether the one-side defrosting operation is being performed as described above (S1). Here, when the one-side defrosting operation is being performed, the refrigerator is operated as in the second embodiment. When it is determined whether or not the refrigerator is operating, when the refrigerator is stopped, the ON time TON and the OFF time TOFF of the refrigerator are measured by the timer 18, and the ON time TON is, for example, half of one cycle time. It is calculated whether or not (S2, S
3, S4). Here, when the ON time TON is, for example, half or less of one cycle time, the heater 20 is energized to assist this defrosting (S5).

【００９９】このような除霜制御において、本実施例で
はステップ２で冷凍機が停止しているとき、及び、オン
時間ＴONが１サイクル時間の例えば半分より長いとき
は、液温度ｔ１が２０℃以上か、照明スイッチ２３がオ
ンしているか、更には、除霜経過時間Ｔが１時間以上と
なっているかを判断する（Ｓ６，Ｓ７，Ｓ８）。ここ
で、液温度ｔ１が２０℃より低いときはステップ５に戻
ってヒータ２０に通電する。また、液温度ｔ１が２０℃
より高いときでも照明スイッチ２３がオフしていると
き、また、この照明スイッチ２３がオンしているときで
あっても除霜経過時間Ｔが１時間以上となっているとき
は、ステップ５に戻ってヒータ２０に通電する。In such defrosting control, in this embodiment, when the refrigerator is stopped in step 2 and when the ON time TON is longer than, for example, half of one cycle time, the liquid temperature t1 is 20 ° C. From the above, it is determined whether the lighting switch 23 is turned on, and whether the defrosting elapsed time T is 1 hour or more (S6, S7, S8). Here, when the liquid temperature t1 is lower than 20 ° C., the process returns to step 5 and the heater 20 is energized. The liquid temperature t1 is 20 ° C.
When the lighting switch 23 is turned off even at a higher time, or when the defrost elapsed time T is 1 hour or more even when the lighting switch 23 is turned on, the process returns to step 5. To energize the heater 20.

【０１００】このように、本実施例では、液冷媒温度、
冷凍機の運転割合、蛍光灯４の点灯及び消灯、更には除
霜時間の４者からヒータ２０への通電を制御している。
なお、片側除霜停止制御については前記実施例１と同様
である。As described above, in this embodiment, the liquid refrigerant temperature,
The operating ratio of the refrigerator, the turning on and off of the fluorescent lamp 4, and the energization of the heater 20 by the four persons during the defrosting time are controlled.
The one-side defrost stop control is the same as in the first embodiment.

【０１０１】[0101]

【発明の効果】以上説明したように、請求項１の発明に
よれば、冬期の如く液温度が低く除霜不足を起こすおそ
れのあるときは補助電熱ヒータに通電され、短時間でか
つ完全に除霜することができる。As described above, according to the first aspect of the present invention, when the temperature of the liquid is low and there is a possibility of insufficient defrosting as in winter, the auxiliary electric heater is energized to complete the operation in a short time. Can be defrosted.

【０１０２】請求項２の発明によれば、ショーケースの
熱負荷が減少し冷凍機の駆動時間が短くなったときは補
助電熱ヒータに通電される。これにより、前記請求項１
の効果と同様の効果を奏する。According to the invention of claim 2, when the heat load of the showcase is reduced and the driving time of the refrigerator is shortened, the auxiliary electric heater is energized. Thereby, the claim 1
Has the same effect as the effect of.

【０１０３】請求項３の発明によれば、液冷媒の温度の
低下等で除霜時間が長くなったときは補助電熱ヒータに
通電される。これにより、前記請求項１の効果と同様の
効果を奏する。According to the third aspect of the invention, when the defrosting time becomes long due to a decrease in the temperature of the liquid refrigerant, the auxiliary electric heater is energized. As a result, the same effect as that of the first aspect can be obtained.

【０１０４】請求項４の発明によれば、照明装置の消灯
により庫内の熱負荷が減少し冷凍機の駆動時間が短くな
ったときは補助電熱ヒータに通電される。これにより、
前記請求項１の効果と同様の効果を奏する。According to the fourth aspect of the present invention, when the lighting device is turned off to reduce the heat load in the refrigerator and the driving time of the refrigerator is shortened, the auxiliary electric heater is energized. This allows
The same effect as the effect of claim 1 is obtained.

【０１０５】請求項５の発明によれば、冬期の如く液温
度が低く除霜不足を起こすおそれがあり、また、ショー
ケースの熱負荷が減少し冷凍機の駆動時間が短くなった
ときは補助電熱ヒータに通電される。これにより、前記
請求項１の効果と同様の効果を奏する。According to the fifth aspect of the invention, the liquid temperature may be low and defrosting may be insufficient as in the winter, and when the heat load of the showcase is reduced and the driving time of the refrigerator is shortened, the auxiliary operation is performed. The electric heater is energized. As a result, the same effect as that of the first aspect can be obtained.

【０１０６】請求項６の発明によれば、冬期の如く液温
度が低く除霜不足を起こし、また、除霜時間が長くなる
ときは補助電熱ヒータに通電される。これにより、前記
請求項１の効果と同様の効果を奏する。According to the sixth aspect of the present invention, when the liquid temperature is low and defrosting is insufficient as in the winter, and the defrosting time is long, the auxiliary electric heater is energized. As a result, the same effect as that of the first aspect can be obtained.

【０１０７】請求項７の発明によれば、冬期の如く液温
度が低く除霜不足を起こし、また、照明装置の消灯によ
り庫内の熱負荷が減少したときは補助電熱ヒータに通電
される。これにより、前記請求項１の効果と同様の効果
を奏する。According to the seventh aspect of the invention, when the liquid temperature is low and defrosting is insufficient as in the winter, and the heat load in the refrigerator is reduced by turning off the lighting device, the auxiliary electric heater is energized. As a result, the same effect as that of the first aspect can be obtained.

【０１０８】請求項８の発明によれば、ショーケースの
熱負荷が減少し冷凍機の駆動時間が短くなり除霜時間が
長くなるときは補助電熱ヒータに通電される。これによ
り、前記請求項１の効果と同様の効果を奏する。According to the eighth aspect of the present invention, when the heat load of the showcase decreases, the driving time of the refrigerator becomes short, and the defrosting time becomes long, the auxiliary electric heater is energized. As a result, the same effect as that of the first aspect can be obtained.

【０１０９】請求項９の発明によれば、庫内照明の消灯
や庫内商品の減少等によりショーケースの熱負荷が減少
したときは補助電熱ヒータに通電される。これにより、
前記請求項１の効果と同様の効果を奏する。According to the ninth aspect of the present invention, when the heat load on the showcase is reduced due to, for example, turning off the interior lighting or reducing the number of products in the interior, the auxiliary electric heater is energized. This allows
The same effect as the effect of claim 1 is obtained.

【０１１０】請求項１０の発明によれば、照明の消灯等
によりショーケース内の熱負荷が減少する一方、除霜時
間が長くなるときは補助電熱ヒータに通電される。これ
により、前記請求項１の効果と同様の効果を奏する。According to the tenth aspect of the present invention, while the heat load in the showcase is reduced by turning off the illumination, etc., when the defrosting time becomes long, the auxiliary electric heater is energized. As a result, the same effect as that of the first aspect can be obtained.

【０１１１】請求項１１の発明によれば、外気温度の低
下及びショーケース内の熱負荷の減少等により除霜時間
が長くなったときは補助電熱ヒータに通電される。これ
により、前記請求項１の効果と同様の効果を奏する。According to the eleventh aspect of the invention, when the defrosting time becomes long due to a decrease in the outside air temperature, a decrease in the heat load in the showcase, etc., the auxiliary electric heater is energized. As a result, the same effect as that of the first aspect can be obtained.

【０１１２】請求項１２の発明によれば、外気温度の低
下及びショーケース内の熱負荷の減少したときは補助電
熱ヒータに通電される。これにより、前記請求項１の効
果と同様の効果を奏する。According to the twelfth aspect of the invention, when the outside air temperature is lowered and the heat load in the showcase is reduced, the auxiliary electric heater is energized. As a result, the same effect as that of the first aspect can be obtained.

【０１１３】請求項１３の発明によれば、外気温度の低
下及びショーケース内の熱負荷の減少等により除霜時間
が長くなったときは補助電熱ヒータに通電される。これ
により、前記請求項１の効果と同様の効果を奏すること
ができる。According to the thirteenth aspect of the present invention, the auxiliary electric heater is energized when the defrosting time becomes long due to a decrease in the outside air temperature, a decrease in the heat load in the showcase, or the like. As a result, the same effect as that of the first aspect can be obtained.

【０１１４】請求項１４の発明によれば、冬期の如く液
温度が低く除霜不足を起こし、かつ、照明の消灯により
ショーケースの熱負荷が減少し除霜時間が長くなるとき
は補助電熱ヒータに通電される。これにより、前記請求
項１の効果と同様の効果を奏する。According to the fourteenth aspect of the present invention, the auxiliary electric heater is used when the temperature of the liquid is low and defrosting is insufficient as in the winter season, and the heat load on the showcase is reduced by turning off the light and the defrosting time becomes long. Is energized. As a result, the same effect as that of the first aspect can be obtained.

【０１１５】請求項１５の発明によれば、冬期の如く液
温度が低く除霜不足を起こし、かつ、照明の消灯等によ
りショーケースの熱負荷が減少し更に除霜時間が長くな
るときは補助電熱ヒータに通電される。これにより、前
記請求項１の効果と同様の効果を奏する。According to the fifteenth aspect of the present invention, when the temperature of the liquid is low and defrosting is insufficient like in the winter season, and the heat load of the showcase is reduced due to the turning off of the light or the like, the defrosting time is further extended. The electric heater is energized. As a result, the same effect as that of the first aspect can be obtained.

【図面の簡単な説明】[Brief description of drawings]

【図１】オープンショーケースを示す断面図FIG. 1 is a sectional view showing an open showcase.

【図２】オープンショーケースの同時冷却運転を示す冷
媒回路図及び風回路図FIG. 2 is a refrigerant circuit diagram and a wind circuit diagram showing the simultaneous cooling operation of the open showcase.

【図３】オープンショーケースの片側除霜運転を示す冷
媒回路図及び風回路図FIG. 3 is a refrigerant circuit diagram and a wind circuit diagram showing one-side defrosting operation of the open showcase.

【図４】実施例１に係る除霜制御装置の制御ブロック図
及び制御フローチャートFIG. 4 is a control block diagram and control flowchart of the defrosting control device according to the first embodiment.

【図５】実施例２に係る除霜制御装置の制御ブロック図
及び制御フローチャートFIG. 5 is a control block diagram and a control flowchart of the defrost control device according to the second embodiment.

【図６】実施例３に係る除霜制御装置の制御ブロック図
及び制御フローチャートFIG. 6 is a control block diagram and control flowchart of a defrost control device according to a third embodiment.

【図７】実施例４に係る除霜制御装置の制御ブロック図
及び制御フローチャートFIG. 7 is a control block diagram and control flowchart of a defrost control device according to a fourth embodiment.

【図８】実施例５に係る除霜制御装置の制御ブロック図
及び制御フローチャートFIG. 8 is a control block diagram and a control flowchart of a defrost control device according to a fifth embodiment.

【図９】実施例６に係る除霜制御装置の制御ブロック図
及び制御フローチャートFIG. 9 is a control block diagram and a control flowchart of a defrost control device according to a sixth embodiment.

【図１０】実施例７に係る除霜制御装置の制御ブロック
図及び制御フローチャートFIG. 10 is a control block diagram and control flowchart of a defrost control device according to a seventh embodiment.

【図１１】実施例８に係る除霜制御装置の制御ブロック
図及び制御フローチャートFIG. 11 is a control block diagram and a control flowchart of the defrost control device according to the eighth embodiment.

【図１２】実施例９に係る除霜制御装置の制御ブロック
図及び制御フローチャートFIG. 12 is a control block diagram and control flowchart of a defrost control device according to a ninth embodiment.

【図１３】実施例１０に係る除霜制御装置の制御ブロッ
ク図及び制御フローチャートFIG. 13 is a control block diagram and a control flowchart of the defrost control device according to the tenth embodiment.

【図１４】実施例１１に係る除霜制御装置の制御ブロッ
ク図及び制御フローチャートFIG. 14 is a control block diagram and a control flowchart of the defrost control device according to the eleventh embodiment.

【図１５】実施例１２に係る除霜制御装置の制御ブロッ
ク図及び制御フローチャートFIG. 15 is a control block diagram and control flowchart of a defrost control device according to a twelfth embodiment.

【図１６】実施例１３に係る除霜制御装置の制御ブロッ
ク図及び制御フローチャートFIG. 16 is a control block diagram and control flowchart of a defrost control device according to a thirteenth embodiment.

【図１７】実施例１４に係る除霜制御装置の制御ブロッ
ク図及び制御フローチャートFIG. 17 is a control block diagram and control flowchart of a defrost control device according to a fourteenth embodiment.

【図１８】実施例１５に係る除霜制御装置の制御ブロッ
ク図及び制御フローチャートFIG. 18 is a control block diagram and control flowchart of a defrost control device according to a fifteenth embodiment.

【符号の説明】 １…オープンショーケース、４…蛍光灯、７ａ，７ｂ…
蒸発器、１６…庫内温度センサ、１７…ＣＰＵ、１８…
タイマ、２０…補助電熱ヒータ、２１…液温度センサ、
２３…照明スイッチ。[Explanation of symbols] 1 ... Open showcase, 4 ... Fluorescent lamps, 7a, 7b ...
Evaporator, 16 ... Internal temperature sensor, 17 ... CPU, 18 ...
Timer, 20 ... Auxiliary electric heater, 21 ... Liquid temperature sensor,
23 ... Lighting switch.

Claims (15)

【特許請求の範囲】[Claims] 【請求項１】 除霜運転時に高温高圧の液冷媒を蒸発器
に循環して該蒸発器に付着成長した霜を除去するショー
ケースの除霜制御装置において、 前記蒸発器に付着成長した霜を除去する補助電熱ヒータ
と、 前記高温高圧の液冷媒の温度を検出する液温度センサ
と、 前記除霜運転中に前記液温度センサの検出信号に基づき
該液冷媒が所定温度以下となったとき前記補助電熱ヒー
タに通電する制御手段とを備えたことを特徴とするショ
ーケースの除霜制御装置。1. A defrost control device for a showcase, wherein a high-temperature and high-pressure liquid refrigerant is circulated to an evaporator during defrosting operation to remove frost that has adhered and grown to the evaporator. Auxiliary electric heater to be removed, a liquid temperature sensor for detecting the temperature of the high-temperature and high-pressure liquid refrigerant, and when the liquid refrigerant is below a predetermined temperature based on the detection signal of the liquid temperature sensor during the defrosting operation, A defrosting control device for a showcase, comprising: a control unit that energizes an auxiliary electric heater. 【請求項２】 冷凍機の発停を繰り返して庫内を冷却す
るとともに、除霜運転時に高温高圧の液冷媒を蒸発器に
循環して該蒸発器に付着成長した霜を除去するショーケ
ースの除霜制御装置において、 前記蒸発器に付着成長した霜を除去する補助電熱ヒータ
と、 前記冷凍機の駆動時間と停止時間との割合を演算する演
算手段と、 前記演算手段で該冷凍機の駆動時間の割合が所定割合以
下となったとき前記除霜運転において前記補助電熱ヒー
タに通電する制御手段とを備えたことを特徴とするショ
ーケースの除霜制御装置。2. A showcase of cooling and refrigerating the inside of the refrigerator by repeating the start and stop of the refrigerator, and circulating a high-temperature and high-pressure liquid refrigerant to the evaporator during the defrosting operation to remove the frost adhering to and growing on the evaporator. In the defrost control device, an auxiliary electric heater that removes frost that has adhered and grown on the evaporator, a computing unit that computes a ratio of a driving time and a stop time of the refrigerator, and a driving unit that drives the refrigerator by the computing unit. A defrosting control device for a showcase, comprising: a control unit that energizes the auxiliary electric heater in the defrosting operation when a time ratio becomes a predetermined ratio or less. 【請求項３】 除霜運転時に高温高圧の液冷媒を蒸発器
に循環して該蒸発器に付着成長した霜を除去するショー
ケースの除霜制御装置において、 前記蒸発器に付着成長した霜を除去する補助電熱ヒータ
と、 前記除霜運転時間を計数するタイマと、 前記タイマに基づき前記除霜運転時間が所定時間以上と
なったとき前記補助電熱ヒータに通電する制御手段とを
備えたことを特徴とするショーケースの除霜制御装置。3. A defrost control device for a showcase, in which a high-temperature and high-pressure liquid refrigerant is circulated to an evaporator during defrosting operation to remove the frost adhering to the evaporator. An auxiliary electric heater to be removed, a timer that counts the defrosting operation time, and a control unit that energizes the auxiliary electric heater when the defrosting operation time is a predetermined time or more based on the timer. Defrost control device for showcases. 【請求項４】 除霜運転時に高温高圧の液冷媒を蒸発器
に循環して該蒸発器に付着成長した霜を除去するショー
ケースの除霜制御装置において、 前記蒸発器に付着成長した霜を除去する補助電熱ヒータ
と、 庫内の照明装置が消灯したとき前記補助電熱ヒータに通
電する制御手段とを備えたことを特徴とするショーケー
スの除霜制御装置。4. A defrost control device for a showcase, wherein a high-temperature and high-pressure liquid refrigerant is circulated to an evaporator during defrosting operation to remove frost that has adhered and grown to the evaporator. A defrosting control device for a showcase, comprising: an auxiliary electrothermal heater to be removed; and a control unit that energizes the auxiliary electrothermal heater when the lighting device in the refrigerator is turned off. 【請求項５】 冷凍機の発停を繰り返して庫内を冷却す
るとともに、除霜運転時に高温高圧の液冷媒を蒸発器に
循環して該蒸発器に付着成長した霜を除去するショーケ
ースの除霜制御装置において、 前記蒸発器に付着成長した霜を除去する補助電熱ヒータ
と、 前記高温高圧の液冷媒の温度を検出する液温度センサ
と、 前記冷凍機の駆動時間と停止時間との割合を演算する演
算手段と、 前記除霜運転中に該液温度センサの検出信号に基づき該
液冷媒が所定温度以下であるかを判定し、また、前記演
算手段で前記冷凍機の駆動時間の割合が所定割合以下で
あるかを判定し、これらの少なくとも１つの判定条件を
満足するとき前記補助電熱ヒータに通電する制御手段と
を備えたことを特徴とするショーケースの除霜制御装
置。5. A showcase in which a refrigerator is repeatedly turned on and off to cool the inside of the refrigerator and at the time of defrosting operation, a high-temperature and high-pressure liquid refrigerant is circulated to the evaporator to remove frost that has grown on the evaporator. In the defrost control device, an auxiliary electric heater that removes frost that has adhered and grown on the evaporator, a liquid temperature sensor that detects the temperature of the high-temperature high-pressure liquid refrigerant, and a ratio of the drive time and the stop time of the refrigerator. And a calculating means for calculating, and determines whether the liquid refrigerant is below a predetermined temperature based on the detection signal of the liquid temperature sensor during the defrosting operation, and the calculating means calculates the ratio of the driving time of the refrigerator. Is a predetermined ratio or less, and a control means for energizing the auxiliary electric heater when at least one of these determination conditions is satisfied, and a defrost control device for a showcase. 【請求項６】 除霜運転時に高温高圧の液冷媒を蒸発器
に循環して該蒸発器に付着成長した霜を除去するショー
ケースの除霜制御装置において、 前記蒸発器に付着成長した霜を除去する補助電熱ヒータ
と、 前記高温高圧の液冷媒の温度を検出する液温度センサ
と、 前記除霜運転時間を計数するタイマと、 前記除霜運転中に前記液温度センサの検出信号に基づき
該液冷媒が所定温度以下となっているかを判定し、ま
た、前記タイマに基づき除霜運転時間が所定時間以上と
なっているかを判定し、これらの少なくとも１つの判定
条件を満足するとき前記補助電熱ヒータに通電する制御
手段とを備えたことを特徴とするショーケースの除霜制
御装置。6. A defrost control device for a showcase, wherein a high-temperature and high-pressure liquid refrigerant is circulated to an evaporator during defrosting operation to remove frost that has adhered and grown to the evaporator. An auxiliary electric heater to remove, a liquid temperature sensor that detects the temperature of the high-temperature high-pressure liquid refrigerant, a timer that counts the defrosting operation time, and a liquid temperature sensor based on a detection signal of the liquid temperature sensor during the defrosting operation. It is determined whether the liquid refrigerant is at a predetermined temperature or lower, and whether the defrosting operation time is longer than a predetermined time based on the timer, and when at least one of these determination conditions is satisfied, the auxiliary electric heating is performed. A defrosting control device for a showcase, comprising: a control means for energizing a heater. 【請求項７】 除霜運転時に高温高圧の液冷媒を蒸発器
に循環して該蒸発器に付着成長した霜を除去するショー
ケースの除霜制御装置において、 前記蒸発器に付着成長した霜を除去する補助電熱ヒータ
と、 前記高温高圧の液冷媒の温度を検出する液温度センサ
と、 前記除霜運転中に前記液温度センサの検出信号に基づき
該液冷媒が所定温度以下となっているかを判定し、ま
た、庫内の照明装置が消灯したかを判定し、これらの少
なくとも１つの判定条件を満足するとき前記補助電熱ヒ
ータに通電する制御手段とを備えたことを特徴とするシ
ョーケースの除霜制御装置。7. A defrost control device for a showcase, wherein a high-temperature and high-pressure liquid refrigerant is circulated to an evaporator during defrosting operation to remove the frost adhering to the evaporator. An auxiliary electric heater to remove, a liquid temperature sensor that detects the temperature of the high-temperature and high-pressure liquid refrigerant, and whether the liquid refrigerant is below a predetermined temperature based on the detection signal of the liquid temperature sensor during the defrosting operation. And a control means for determining whether or not the lighting device in the refrigerator has been turned off and energizing the auxiliary electric heater when at least one of these determination conditions is satisfied. Defrost control device. 【請求項８】 冷凍機の発停を繰り返して庫内を冷却す
るとともに、除霜運転時に高温高圧の液冷媒を蒸発器に
循環して該蒸発器に付着成長した霜を除去するショーケ
ースの除霜制御装置において、 前記蒸発器に付着成長した霜を除去する補助電熱ヒータ
と、 前記冷凍機の駆動時間と停止時間との割合を演算する演
算手段と、 前記除霜運転時間を計数するタイマと、 前記演算手段で前記冷凍機の駆動時間の割合が所定割合
以下となっているかを判定し、また、前記タイマに基づ
き前記除霜運転時間が所定時間以上となったかを判定
し、これらの少なくとも１つの判定条件を満足するとき
前記補助電熱ヒータに通電する制御手段とを備えたこと
を特徴とするショーケースの除霜制御装置。8. A showcase for cooling the interior of a refrigerator by repeatedly turning on and off a refrigerator, and circulating a high-temperature and high-pressure liquid refrigerant to an evaporator during a defrosting operation to remove frost that has grown on the evaporator. In the defrost control device, an auxiliary electric heater that removes the frost that has adhered and grown on the evaporator, a computing unit that computes the ratio of the drive time and the stop time of the refrigerator, and a timer that counts the defrost operation time. And, it is determined whether the ratio of the driving time of the refrigerator is equal to or less than a predetermined ratio in the calculation unit, and also it is determined whether the defrosting operation time is equal to or more than a predetermined time based on the timer. A defrost control device for a showcase, comprising: a control unit that energizes the auxiliary electric heater when at least one determination condition is satisfied. 【請求項９】 冷凍機の発停を繰り返して庫内を冷却す
るとともに、除霜運転時に高温高圧の液冷媒を蒸発器に
循環して該蒸発器に付着成長した霜を除去するショーケ
ースの除霜制御装置において、 前記蒸発器に付着成長した霜を除去する補助電熱ヒータ
と、 前記冷凍機の駆動時間と停止時間との割合を演算する演
算手段と、 前記演算手段で前記冷凍機の駆動時間の割合が所定割合
以下となったかを判定し、また、庫内の照明装置を消灯
したかを判定し、これらの少なくとも１つの判定条件を
満足するとき前記補助電熱ヒータに通電する制御手段と
を備えたことを特徴とするショーケースの除霜制御装
置。9. A showcase in which a refrigerator is repeatedly turned on and off to cool the inside of the refrigerator, and at the time of defrosting operation, a high-temperature and high-pressure liquid refrigerant is circulated to the evaporator to remove frost that has grown on the evaporator. In the defrost control device, an auxiliary electric heater that removes frost that has adhered and grown on the evaporator, a calculation unit that calculates a ratio of a drive time and a stop time of the refrigerator, and a drive of the refrigerator by the calculation unit. A control means for determining whether the time ratio is equal to or less than a predetermined ratio, determining whether the lighting device in the refrigerator is turned off, and energizing the auxiliary electric heater when at least one of these determination conditions is satisfied; A defrost control device for a showcase, comprising: 【請求項１０】 除霜運転時に高温高圧の液冷媒を蒸発
器に循環して該蒸発器に付着成長した霜を除去するショ
ーケースの除霜制御装置において、 前記蒸発器に付着成長した霜を除去する補助電熱ヒータ
と、 前記除霜運転時間を計数するタイマと、 前記タイマに基づき該除霜運転時間が所定時間以上とな
ったかを判定し、また、庫内の照明装置が消灯したかを
判定し、これらの少なくとも１つの判定条件を満足する
とき前記補助電熱ヒータに通電する制御手段とを備えた
ことを特徴とするショーケースの除霜制御装置。10. A defrost control device for a showcase, wherein a high-temperature and high-pressure liquid refrigerant is circulated to an evaporator during defrosting operation to remove the frost adhering to the evaporator. An auxiliary electric heater to be removed, a timer that counts the defrosting operation time, it is determined whether the defrosting operation time is equal to or longer than a predetermined time based on the timer, and whether the lighting device in the refrigerator is turned off. A defrosting control apparatus for a showcase, comprising: a control unit that makes a determination and energizes the auxiliary electric heater when at least one of these determination conditions is satisfied. 【請求項１１】 冷凍機の発停を繰り返して庫内を冷却
するとともに、除霜運転時に高温高圧の液冷媒を蒸発器
に循環して該蒸発器に付着成長した霜を除去するショー
ケースの除霜制御装置において、 前記蒸発器に付着成長した霜を除去する補助電熱ヒータ
と、 前記高温高圧の液冷媒の温度を検出する液温度センサ
と、 前記冷凍機の駆動時間と停止時間との割合を演算する演
算手段と、 前記除霜運転時間を計数するタイマと、 前記除霜運転中に該液温度センサの検出信号に基づき該
液冷媒が所定温度以下となったかを判定し、また、前記
演算手段で前記冷凍機の駆動時間の割合が所定割合以下
となったかを判定し、更に前記タイマに基づき該除霜運
転時間が所定時間以上となったかを判定し、これらの少
なくとも１つの判定条件を満足するとき前記補助電熱ヒ
ータに通電する制御手段とを備えたことを特徴とするシ
ョーケースの除霜制御装置。11. A showcase in which a refrigerator is repeatedly turned on and off to cool the inside of the refrigerator and at the time of defrosting operation, a high-temperature and high-pressure liquid refrigerant is circulated to the evaporator to remove frost that has grown on the evaporator. In the defrost control device, an auxiliary electric heater that removes frost that has adhered and grown on the evaporator, a liquid temperature sensor that detects the temperature of the high-temperature and high-pressure liquid refrigerant, and a ratio of the drive time and the stop time of the refrigerator. And a timer that counts the defrosting operation time, and determines whether or not the liquid refrigerant has reached a predetermined temperature or lower based on a detection signal of the liquid temperature sensor during the defrosting operation. At least one of these determination conditions is determined by the calculation means, whether or not the ratio of the driving time of the refrigerator is below a predetermined ratio, and whether or not the defrosting operation time is above a predetermined time based on the timer. To satisfy Defrosting control apparatus of the showcase, characterized in that a control means for energizing the auxiliary electric heater can. 【請求項１２】 冷凍機の発停を繰り返して庫内を冷却
するとともに、除霜運転時に高温高圧の液冷媒を蒸発器
に循環して該蒸発器に付着成長した霜を除去するショー
ケースの除霜制御装置において、 前記蒸発器に付着成長した霜を除去する補助電熱ヒータ
と、 前記高温高圧の液冷媒の温度を検出する液温度センサ
と、 前記冷凍機の駆動時間と停止時間との割合を演算する演
算手段と、 前記除霜運転中に前記液温度センサの検出信号に基づき
該液冷媒が所定温度以下となったかを判定し、また、前
記演算手段で前記冷凍機の駆動時間の割合が所定割合以
下となったかを判定し、更に庫内の照明装置が消灯した
かを判定し、これらの少なくとも１つの判定条件を満足
するとき前記補助電熱ヒータに通電する制御手段とを備
えたことを特徴とするショーケースの除霜制御装置。12. A showcase for cooling the interior of a refrigerator by repeating the start and stop of a refrigerator and circulating a high-temperature and high-pressure liquid refrigerant to an evaporator during a defrosting operation to remove frost that has grown on the evaporator. In the defrost control device, an auxiliary electric heater that removes frost that has adhered and grown on the evaporator, a liquid temperature sensor that detects the temperature of the high-temperature high-pressure liquid refrigerant, and a ratio of the drive time and the stop time of the refrigerator. And a calculating means for calculating, determining whether the liquid refrigerant has become a predetermined temperature or less based on the detection signal of the liquid temperature sensor during the defrosting operation, and the calculating means calculates the ratio of the driving time of the refrigerator. Is determined to be less than or equal to a predetermined ratio, further determines whether or not the lighting device in the refrigerator has been turned off, and supplies control means for energizing the auxiliary electric heater when at least one of these determination conditions is satisfied. Characterized by Defrosting control apparatus of the showcase. 【請求項１３】 除霜運転時に高温高圧の液冷媒を蒸発
器に循環して該蒸発器に付着成長した霜を除去するショ
ーケースの除霜制御装置において、 前記蒸発器に付着成長した霜を除去する補助電熱ヒータ
と、 前記高温高圧の液冷媒の温度を検出する液温度センサ
と、 前記除霜運転時間を計数するタイマと、 前記除霜運転中に該液温度センサの検出信号に基づき該
液冷媒が所定温度以下となったかを判定し、また、前記
タイマに基づき該除霜運転時間が所定時間以上となった
かを判定し、更に庫内の照明装置が消灯したかを判定
し、これらの少なくとも１つの判定条件を満足するとき
前記補助電熱ヒータに通電する制御手段とを備えたこと
を特徴とするショーケースの除霜制御装置。13. A defrost control device for a showcase, wherein a high-temperature and high-pressure liquid refrigerant is circulated to an evaporator during defrosting operation to remove frost that has adhered and grown to the evaporator. An auxiliary electric heater to remove, a liquid temperature sensor that detects the temperature of the high-temperature and high-pressure liquid refrigerant, a timer that counts the defrosting operation time, and a timer based on a detection signal of the liquid temperature sensor during the defrosting operation. It is determined whether the liquid refrigerant has become a predetermined temperature or less, also determines whether the defrosting operation time has become a predetermined time or more based on the timer, further determines whether the lighting device in the refrigerator is turned off, these The defrosting control device for a showcase, comprising: a control unit that energizes the auxiliary electric heater when at least one of the determination conditions is satisfied. 【請求項１４】 冷凍機の発停を繰り返して庫内を冷却
するとともに、除霜運転時に高温高圧の液冷媒を蒸発器
に循環して該蒸発器に付着成長した霜を除去するショー
ケースの除霜制御装置において、 前記蒸発器に付着成長した霜を除去する補助電熱ヒータ
と、 前記冷凍機の駆動時間と停止時間との割合を演算する演
算手段と、 前記除霜運転時間を計数するタイマと、 前記演算手段で該冷凍機の駆動時間の割合が所定割合以
下となったかを判定し、また、前記タイマに基づき該除
霜運転時間が所定時間以上となったかを判定し、更に庫
内の照明装置が消灯したかを判定し、これらの少なくと
も１つの判定条件を満足するとき前記補助電熱ヒータに
通電する制御手段とを備えたことを特徴とするショーケ
ースの除霜制御装置。14. A showcase in which a refrigerator is repeatedly turned on and off to cool the inside of a refrigerator and at the time of defrosting operation, a high-temperature and high-pressure liquid refrigerant is circulated to an evaporator to remove frost that has grown on the evaporator. In the defrost control device, an auxiliary electric heater that removes the frost that has adhered and grown on the evaporator, a computing unit that computes the ratio of the drive time and the stop time of the refrigerator, and a timer that counts the defrost operation time. And, the calculating means determines whether the ratio of the driving time of the refrigerator has become a predetermined ratio or less, and also determines whether the defrosting operation time has become a predetermined time or more based on the timer. The defrosting control device for a showcase, comprising: a control unit that determines whether the lighting device is turned off, and energizes the auxiliary electric heater when at least one of these determination conditions is satisfied. 【請求項１５】 冷凍機の発停を繰り返して庫内を冷却
するとともに、除霜運転時に高温高圧の液冷媒を蒸発器
に循環して該蒸発器に付着成長した霜を除去するショー
ケースの除霜制御装置において、 前記蒸発器に付着成長した霜を除去する補助電熱ヒータ
と、 前記高温高圧の液冷媒の温度を検出する液温度センサ
と、 前記冷凍機の駆動時間と停止時間との割合を演算する演
算手段と、 前記除霜運転時間を計数するタイマと、 前記除霜運転中に前記液温度センサの検出信号に基づき
該液冷媒が所定温度以下となったかを判定し、前記演算
手段で前記冷凍機の駆動時間の割合が所定割合以下とな
ったかを判定し、前記タイマに基づき該除霜運転時間が
所定時間以上となったかを判定し、更に庫内の照明装置
が消灯したかを判定し、これらの少なくとも１つの判定
条件を満足するとき前記補助電熱ヒータに通電する制御
手段とを備えたことを特徴とするショーケースの除霜制
御装置。15. A showcase in which a refrigerator is repeatedly turned on and off to cool the inside of the refrigerator and at the time of defrosting operation, a high-temperature and high-pressure liquid refrigerant is circulated to the evaporator to remove frost that has grown on the evaporator. In the defrost control device, an auxiliary electric heater that removes frost that has adhered and grown on the evaporator, a liquid temperature sensor that detects the temperature of the high-temperature and high-pressure liquid refrigerant, and a ratio of the drive time and the stop time of the refrigerator. And a timer that counts the defrosting operation time, and determines whether the liquid refrigerant has reached a predetermined temperature or lower based on a detection signal of the liquid temperature sensor during the defrosting operation, It is determined whether the ratio of the driving time of the refrigerator has become equal to or less than a predetermined ratio, and whether the defrosting operation time has become equal to or more than a predetermined time based on the timer, and whether the lighting device in the refrigerator is turned off. Judging the Defrosting control apparatus of the showcase, characterized in that a control means for energizing the auxiliary electric heater when satisfying Kutomo one determination condition.
JP12439393A 1993-05-26 1993-05-26 Showcase defrost controller Expired - Lifetime JP3313452B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12439393A JP3313452B2 (en) 1993-05-26 1993-05-26 Showcase defrost controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12439393A JP3313452B2 (en) 1993-05-26 1993-05-26 Showcase defrost controller

Publications (2)

Publication Number Publication Date
JPH06331264A true JPH06331264A (en) 1994-11-29
JP3313452B2 JP3313452B2 (en) 2002-08-12

Family

ID=14884318

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12439393A Expired - Lifetime JP3313452B2 (en) 1993-05-26 1993-05-26 Showcase defrost controller

Country Status (1)

Country Link
JP (1) JP3313452B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006052878A (en) * 2004-08-10 2006-02-23 Hoshizaki Electric Co Ltd Defrosting control device for refrigeration storage
JP2018165599A (en) * 2017-03-28 2018-10-25 エスペック株式会社 Interior environment adjustment device and food maturation device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006052878A (en) * 2004-08-10 2006-02-23 Hoshizaki Electric Co Ltd Defrosting control device for refrigeration storage
JP4630016B2 (en) * 2004-08-10 2011-02-09 ホシザキ電機株式会社 Defrost control device for cooling storage
JP2018165599A (en) * 2017-03-28 2018-10-25 エスペック株式会社 Interior environment adjustment device and food maturation device

Also Published As

Publication number Publication date
JP3313452B2 (en) 2002-08-12

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