JP2018009709A - refrigerator - Google Patents

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JP2018009709A
JP2018009709A JP2016136592A JP2016136592A JP2018009709A JP 2018009709 A JP2018009709 A JP 2018009709A JP 2016136592 A JP2016136592 A JP 2016136592A JP 2016136592 A JP2016136592 A JP 2016136592A JP 2018009709 A JP2018009709 A JP 2018009709A
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defrosting
time
integrated value
period
refrigerator
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JP6562879B2 (en
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直之 小林
Naoyuki Kobayashi
直之 小林
暢志郎 小池
Nobushiro Koike
暢志郎 小池
慎一郎 岡留
Shinichiro Okadome
慎一郎 岡留
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Hitachi Appliances Inc
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Hitachi Appliances Inc
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Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator capable of not only suppressing a substantial increase in temperature in a storage chamber by performing defrosting according to an actual use state, but also suppressing an increase in energy consumption when an unnecessary defrosting operation is performed, by appropriately controlling the frequency of defrosting operations.SOLUTION: A refrigerator of the present invention includes defrosting means for defrosting frost adhering to a chiller, compressor operation time calculation means for calculating an operation time of a compressor, door open time calculation means for calculating an open time of a door, and integrated value calculation means for calculating an integrated value obtained by integrating the compressor operation time and the door open time. During a first period, a defrosting operation by the defrosting means is not performed when the integrated value does not reach a first threshold, and during an extension period following the first period, the defrosting operation is performed when the integrated value reaches a second threshold smaller than the first threshold.SELECTED DRAWING: Figure 7

Description

本発明は、冷却器の除霜運転を行う冷蔵庫に関する。   The present invention relates to a refrigerator that performs a defrosting operation of a cooler.

特許文献１には、冷蔵庫の消費電力量低減化を図るため、圧縮機の積算運転時間と前記圧縮機の運転時間により、除霜周期を延長させるにより低消費電力量の冷蔵庫として、冷凍室にドアスイッチ機構を有せず、圧縮機と減圧器と蒸発器と構成され、冷凍サイクルによって冷却された冷気を庫内に循環させる冷却用ファンと、前記蒸発器に付着した霜を除去させる除霜ヒータを有する冷蔵庫において、前記圧縮機の積算運転時間と前記圧縮機の運転時間により、除霜周期を延長させ除霜ヒータ通電率を低下させることにより、消費電力量を低減するものが開示されている。   In Patent Document 1, in order to reduce power consumption of a refrigerator, a refrigerator with low power consumption can be provided in a freezer compartment by extending the defrost cycle according to the accumulated operation time of the compressor and the operation time of the compressor. A cooling fan that does not have a door switch mechanism and is composed of a compressor, a decompressor, and an evaporator, and circulates the cold air cooled by the refrigeration cycle in the cabinet, and a defrost that removes frost adhering to the evaporator In a refrigerator having a heater, there is disclosed an apparatus that reduces power consumption by extending a defrost cycle and decreasing a defrost heater energization rate based on an accumulated operation time of the compressor and an operation time of the compressor. Yes.

そして、同文献の例えば図２から図４に示される除霜制御では、冷却器に除霜ヒータを配置して、前回の除霜終了時点から圧縮機の運転時間を積算し、その積算値が所定の時間に達した場合に、除霜を実施するかの判断を行っている。   In the defrosting control shown in FIGS. 2 to 4, for example, in the same document, a defrosting heater is arranged in the cooler, the operation time of the compressor is integrated from the end of the previous defrosting, and the integrated value is When a predetermined time is reached, it is determined whether to perform defrosting.

また、特許文献２には、実使用状況に合わせて除霜を実行することにより、貯蔵室内の大幅な温度上昇を抑制する冷蔵庫として、７日分の扉の開時間を１時間毎に蓄積し、各時間から３時間単位での扉開時間を加算する。除霜終了時に次の除霜を開始可能な範囲（８時間後から２４時間後）を求め、その範囲内で扉開時間の少ない時間単位が存在したら、その時刻を除霜開始予定時刻とする。除霜開始予定時刻前に圧縮機の運転積算時間が所定の時間に達した場合は、その時点で除霜を開始するものが開示されている。   Further, Patent Document 2 accumulates the door opening time for 7 days every hour as a refrigerator that suppresses a significant temperature rise in the storage room by performing defrosting according to the actual usage situation. Add the door opening time in units of 3 hours from each time. When a range (8 hours to 24 hours later) at which the next defrosting can be started at the end of defrosting is obtained, and there is a time unit with a small door opening time within that range, that time is set as the scheduled defrosting start time . It is disclosed that when the accumulated operation time of the compressor reaches a predetermined time before the scheduled defrosting start time, the defrosting is started at that time.

そして、同文献の例えば図４Ａに示される除霜制御では、圧縮機運転時間の積算値が所定の時間に達しない場合であっても、前回の除霜運転から既定の除霜間隔時間が経過した場合に、除霜運転を開始している。   And in the defrost control shown by FIG. 4A of the same literature, even if it is a case where the integrated value of compressor operation time does not reach predetermined time, predetermined defrost interval time passes since the last defrost operation. In this case, the defrosting operation is started.

特開２００６−６４２４４号公報JP 2006-64244 A 特開２０１２−５７８８６号公報JP 2012-57886 A

しかしながら、特許文献１の図２から図４の除霜制御では、圧縮機の運転時間の積算値が所定時間に達しない限り、除霜運転が開始されないため、冷却器に多量の霜が付着したまま運転が継続されるという問題があった。   However, in the defrost control of FIGS. 2 to 4 of Patent Document 1, since the defrost operation is not started unless the integrated value of the compressor operation time reaches a predetermined time, a large amount of frost has adhered to the cooler. There was a problem of continued operation.

また、特許文献２の図４Ａの除霜制御では、既定の除霜間隔時間が経過した場合に必ず除霜運転を実行するため、冷蔵庫の扉の開時間が短く、圧縮機の運転時間も短いなど、冷却器への霜の付着が少ない場合であっても除霜運転が開始されてしまい、消費電力を抑制できないという問題があった。   Moreover, in the defrost control of FIG. 4A of patent document 2, since the defrost operation is always performed when the predetermined defrost interval time has elapsed, the open time of the refrigerator door is short and the compressor operation time is also short. For example, even if there is little frost adhesion to the cooler, the defrosting operation is started, and there is a problem that power consumption cannot be suppressed.

そこで、本発明は、実使用状況に合わせて除霜を実行することにより、貯蔵室内の大幅な温度上昇を抑制することができることに加え、除霜運転の頻度を適切に制御することによって、不要な除霜運転を行うことによる消費エネルギーの増加を抑制することができる冷蔵庫を提供することを目的とする。   Therefore, the present invention eliminates the need for controlling the frequency of defrosting operation appropriately by performing defrosting in accordance with the actual use situation, in addition to suppressing a significant temperature rise in the storage chamber. It aims at providing the refrigerator which can suppress the increase in the energy consumption by performing a defrosting operation.

上記課題を解決するために、本発明の冷蔵庫は、冷蔵室または冷凍室の扉と、圧縮機と冷却器を有する冷凍サイクルと、前記冷却器に付着する霜を除霜する除霜手段と、前記扉の開閉を検知する扉開閉検知手段と、時間帯毎の前記圧縮機の運転時間を算出する圧縮機運転時間算出手段と、時間帯毎の前記扉の開時間を算出する扉開時間算出手段と、圧縮機運転時間および扉開時間を積算した積算値を算出する積算値算出手段と、を有し、第一期間中に、前記積算値が第一閾値に達した場合、前記除霜手段による除霜運転を実施し、前記積算値が第一閾値に達しない場合、前記除霜手段による除霜運転を実施せず、前記第一期間に続く延長期間中に、前記積算値が前記第一閾値よりも小さい第二閾値に達した場合、前記除霜手段による除霜運転を実施することとした。   In order to solve the above problems, the refrigerator of the present invention includes a refrigerator compartment or freezer compartment door, a refrigeration cycle having a compressor and a cooler, and a defrosting means for defrosting frost adhering to the cooler. Door opening / closing detection means for detecting opening / closing of the door, compressor operating time calculating means for calculating the operating time of the compressor for each time zone, and door opening time calculation for calculating the door opening time for each time zone And an integrated value calculating means for calculating an integrated value obtained by integrating the compressor operating time and the door opening time, and when the integrated value reaches a first threshold during the first period, the defrosting When the defrosting operation by means is performed and the integrated value does not reach the first threshold value, the defrosting operation by the defrosting means is not performed, and during the extended period following the first period, the integrated value is When the second threshold value smaller than the first threshold value is reached, the defrosting operation by the defrosting means is performed. It was decided to implement.

本発明によれば、実使用状況に合わせて除霜を実行することにより、貯蔵室内の大幅な温度上昇を抑制することができることに加え、除霜運転の頻度を適切に制御することによって、不要な除霜運転を行うことによる消費エネルギーの増加を抑制することができる。   According to the present invention, by performing defrosting according to the actual usage situation, it is possible to suppress a significant temperature rise in the storage chamber, and in addition, it is unnecessary by appropriately controlling the frequency of the defrosting operation. The increase in energy consumption due to performing a defrosting operation can be suppressed.

一実施例の冷蔵庫の正面図である。It is a front view of the refrigerator of one Example. 一実施例の冷蔵庫の断面図である。It is sectional drawing of the refrigerator of one Example. 一実施例の冷却器の斜視図である。It is a perspective view of the cooler of one example. 一実施例の冷蔵庫の制御ブロック図である。It is a control block diagram of the refrigerator of one Example. 一実施例の冷蔵庫の除霜運転制御を説明するタイムチャートである。It is a time chart explaining the defrost operation control of the refrigerator of one Example. 一実施例の冷蔵庫の除霜運転制御を説明するタイムチャートである。It is a time chart explaining the defrost operation control of the refrigerator of one Example. 一実施例の冷蔵庫の除霜運転制御を説明するフローチャートである。It is a flowchart explaining the defrost operation control of the refrigerator of one Example.

以下本発明の実施例を図１から図６を用いて説明する。   Embodiments of the present invention will be described below with reference to FIGS.

図１は本実施例の冷蔵庫１の正面図である。冷蔵庫１は、冷蔵室または冷凍室の扉１０１〜１０６を備えており、扉１０１の前面には操作パネル１０７を備えている。   FIG. 1 is a front view of the refrigerator 1 of the present embodiment. The refrigerator 1 includes doors 101 to 106 of a refrigerator compartment or a freezer compartment, and an operation panel 107 is provided on the front surface of the door 101.

図２は冷蔵庫１を図１のＡ−Ａで切断した断面図である。図２において、９ａは冷媒を圧縮循環させる圧縮機、９ｂは圧縮機９ａとともに冷凍サイクルを形成し冷媒を蒸発させる冷却器、１０は冷却器９ｂにより冷却された冷気を冷蔵庫内に循環させる庫内冷却ファン、１１は冷却器９ｂに付着した霜を解かすラジアントヒータなどの除霜ヒータである。   FIG. 2 is a cross-sectional view of the refrigerator 1 taken along the line AA of FIG. In FIG. 2, 9a is a compressor that compresses and circulates refrigerant, 9b is a cooler that forms a refrigeration cycle together with the compressor 9a and evaporates the refrigerant, and 10 is an interior that circulates cold air cooled by the cooler 9b into the refrigerator. A cooling fan 11 is a defrosting heater such as a radiant heater that dissolves frost adhering to the cooler 9b.

次に、図３の斜視図を用いて、冷却器９ｂの構造を詳細に説明する。図３において、冷却器９ｂはフィン３０１が複数枚挿入された冷媒配管３０２を、上下方向に複数段となるように蛇行状に構成している。冷媒配管３０２の両端に位置して、上段と下段を接続する略Ｕ字状の湾曲部は、サイドプレート３０３ａ、３０３ｂでそれぞれ支持されており、外形が略矩形状の冷却器９ｂが構成されている。この冷媒配管３０２の一端にはアキユームレータ３０４が取り付けられている。   Next, the structure of the cooler 9b will be described in detail with reference to the perspective view of FIG. In FIG. 3, the cooler 9b has a refrigerant pipe 302 into which a plurality of fins 301 are inserted in a meandering manner so as to form a plurality of stages in the vertical direction. The substantially U-shaped curved portions connecting the upper and lower stages located at both ends of the refrigerant pipe 302 are respectively supported by the side plates 303a and 303b, and the cooler 9b having a substantially rectangular outer shape is configured. Yes. An accumulator 304 is attached to one end of the refrigerant pipe 302.

パイプヒータ３０５は、冷却器９ｂに接触又は近接するように配置されており、一例として上段と下段のフィン３０１の隙間に位置するように蛇行状に構成されている。さらパイプヒータ３０５の両端に位置して、上段と下段を接続する略Ｕ字状の湾曲部は、サイドプレート３０３ａ、３０３ｂでそれぞれ支持されている。パイプヒータ３０５は、一例としてアルミニウム配管内にコードヒータを挿入して形成されたものである。本実施例では、冷却器９ｂの下方に設けた除霜ヒータ１１またはパイプヒータ３０５によって冷却器９ｂに付着した霜を融解する構成である。   The pipe heater 305 is disposed so as to be in contact with or close to the cooler 9b, and as an example, is configured in a meandering manner so as to be positioned in a gap between the upper and lower fins 301. Furthermore, the substantially U-shaped curved portions that are located at both ends of the pipe heater 305 and connect the upper and lower stages are supported by side plates 303a and 303b, respectively. As an example, the pipe heater 305 is formed by inserting a cord heater into an aluminum pipe. In this embodiment, the defrost heater 11 or the pipe heater 305 provided below the cooler 9b is used to melt the frost attached to the cooler 9b.

図４は冷蔵庫１の制御ブロック図である。図４において、５は冷蔵室扉の開閉を検知する冷蔵室扉スイッチ、６は冷凍室扉の開閉を検知する冷凍室扉スイッチ、７は除霜の開始および終了を判定するために冷却器９ｂの温度を検知する冷却器温度センサ、８は冷蔵庫１の周囲温度を検知する外気温温度センサである。２は制御部であり、冷蔵庫１の全体を制御するマイコン３を搭載し、マイコン３は扉１０１〜１０６の開時間、圧縮機９ａの運転時間や冷蔵庫の周囲温度などを把握し、それらを内蔵するメモリ４に記憶する。   FIG. 4 is a control block diagram of the refrigerator 1. In FIG. 4, 5 is a refrigerator compartment door switch for detecting the opening / closing of the refrigerator compartment door, 6 is a freezer compartment door switch for detecting the opening / closing of the freezer compartment door, and 7 is a cooler 9b for judging the start and end of defrosting. A cooler temperature sensor for detecting the temperature of the refrigerator 1 and an outside air temperature sensor 8 for detecting the ambient temperature of the refrigerator 1. Reference numeral 2 denotes a control unit, which is equipped with a microcomputer 3 that controls the entire refrigerator 1. The microcomputer 3 grasps the opening time of the doors 101 to 106, the operation time of the compressor 9a, the ambient temperature of the refrigerator, and the like. Stored in the memory 4.

次に、図５を用いて、本実施例の除霜運転制御を説明する。特許文献２の図４Ａでは、圧縮機積算運転時間が既定の除霜開始運転時間に達した場合に除霜運転を実施していた。一方、圧縮機積算運転時間が当該除霜開始運転時間に達しない場合は、除霜運転が実施されないという問題があった。そこで、本実施例では、圧縮機積算運転時間等が所定の除霜周期内に特許文献２の除霜開始運転時間に相当する第一閾値に達しなかった場合は、第一閾値よりも小さい第二閾値を導入し除霜運転実施の要否を判断するものである。   Next, the defrosting operation control of this embodiment will be described with reference to FIG. In FIG. 4A of Patent Document 2, the defrosting operation is performed when the compressor integrated operation time reaches the predetermined defrosting start operation time. On the other hand, when the compressor integrated operation time does not reach the defrost start operation time, there is a problem that the defrost operation is not performed. Therefore, in this embodiment, when the compressor integrated operation time or the like does not reach the first threshold value corresponding to the defrosting start operation time of Patent Document 2 within a predetermined defrosting cycle, the second value smaller than the first threshold value is set. Two threshold values are introduced to determine whether or not the defrosting operation is necessary.

図４の制御ブロック図からも分かるように、マイコン３は、圧縮機９ａへの出力信号に基づいて、圧縮機９ａの運転時間を把握することができる。また、マイコン３は、冷蔵室扉スイッチ５や冷凍室扉スイッチ６からの入力信号に基づいて、扉の開時間を把握することもできる。これらは所定時間帯毎にまとめられ、図５（ａ）（ｂ）に示す、圧縮機運転時間データ、扉開時間データとしてメモリ４に記憶される。また、マイコン３は、図５（ａ）の圧縮機運転時間、図５（ｂ）の扉開時間それぞれに所定の係数をかけ積算したものを、図５（ｃ）に示す積算値としてメモリ４に記憶する。   As can be seen from the control block diagram of FIG. 4, the microcomputer 3 can grasp the operation time of the compressor 9 a based on the output signal to the compressor 9 a. The microcomputer 3 can also grasp the opening time of the door based on the input signal from the refrigerator door switch 5 or the freezer door switch 6. These are collected for each predetermined time zone and stored in the memory 4 as compressor operation time data and door opening time data shown in FIGS. 5 (a) and 5 (b). Further, the microcomputer 3 stores the values obtained by multiplying the compressor operating time in FIG. 5A and the door opening time in FIG. 5B by a predetermined coefficient and integrating them as an integrated value shown in FIG. 5C. To remember.

ここでは、両者に同じ係数をかけたと仮定して積算値を演算しているが、外気温、扉の大きさなどの状況に応じて、係数を変えても良い。例えば、外気温温度センサ８から得た外気温が高い場合は扉開時間にかける係数を大きくし、外気温が低い場合は扉開時間にかける係数を小さくするなどである。   Here, the integrated value is calculated on the assumption that the same coefficient is applied to both, but the coefficient may be changed according to the situation such as the outside air temperature and the size of the door. For example, when the outside air temperature obtained from the outside air temperature sensor 8 is high, the coefficient applied to the door opening time is increased, and when the outside air temperature is low, the coefficient applied to the door opening time is decreased.

本実施例の冷蔵庫１では、例えば２４時間間隔などの既定の除霜周期が用意されている。以下では、最初の除霜周期を、「第一期間」と称し、これに続く除霜周期を「延長期間」、「第二期間」、「第三期間」などと称する。なお、以下では「第一期間」と「延長期間」の長さを等しくした例で説明を行うが、両者の長さを異ならせても良い。   In the refrigerator 1 of the present embodiment, a predetermined defrost cycle such as a 24-hour interval is prepared. Hereinafter, the first defrost cycle is referred to as “first period”, and the subsequent defrost cycle is referred to as “extended period”, “second period”, “third period”, and the like. In the following description, the lengths of the “first period” and the “extension period” are equal to each other. However, the lengths of both may be different.

図５の例では、第一期間中は積算値が第一閾値に達しておらず、最終時間帯で第一閾値よりも小さい第二閾値にも達していないため、第一期間中には除霜運転が実施されない。図５（ｄ）では当該期間中に除霜運転が実施されなかったことを「×」で示している。第一期間に続く第二期間（延長期間ともいう）では、第二期間の最終時間帯には積算値が第二閾値にも達しないため、第二期間中には除霜運転が実施されない。一方、第三期間の最終時間帯には積算値が第二閾値に達するため、第三期間の最終時間帯に除霜運転が実施される。   In the example of FIG. 5, the integrated value does not reach the first threshold value during the first period and does not reach the second threshold value that is smaller than the first threshold value in the final time zone. Frost operation is not performed. In FIG. 5D, “x” indicates that the defrosting operation was not performed during the period. In the second period (also referred to as the extension period) following the first period, the integrated value does not reach the second threshold value in the final time zone of the second period, so the defrosting operation is not performed during the second period. On the other hand, since the integrated value reaches the second threshold value in the last time zone of the third period, the defrosting operation is performed in the last time zone of the third period.

除霜運転が実行されると、次の期間は第一期間となり、積算値がゼロにリセットされる。   When the defrosting operation is executed, the next period becomes the first period, and the integrated value is reset to zero.

なお、ここで実施される除霜運転とは、単に圧縮機９ａを停止して除霜ヒータ１１やパイプヒータ３０５に通電することに限定されるものではなく、除霜前のプリクール運転や、霜冷却運転を含んでも良い。霜冷却運転とは、圧縮機９ａを停止後、除霜ヒータ１１やパイプヒータ３０５の通電前に庫内冷却ファン１０を運転し、冷却器９ｂに付着した霜の冷気を循環させ、庫内を冷却する冷却方法である。   Note that the defrosting operation performed here is not limited to simply stopping the compressor 9a and energizing the defrosting heater 11 or the pipe heater 305, but a precooling operation before defrosting or frosting. A cooling operation may be included. In the frost cooling operation, after the compressor 9a is stopped, the internal cooling fan 10 is operated before the defrost heater 11 and the pipe heater 305 are energized, and the frost cool air adhering to the cooler 9b is circulated. This is a cooling method for cooling.

以上で説明した図５に示す除霜運転制御によれば、圧縮機運転時間が短い場合や、扉開時間が短い場合など、霜の付着が少なく除霜運転の必要がないと判断できる場合は、既定の除霜間隔毎の除霜運転をスキップすることで、除霜運転でのエネルギー消費を回避し、冷蔵庫１の消費エネルギーを抑制するとともに、続く除霜周期中はより小さい閾値を用いて除霜要否を判断することで、長時間除霜が行われないという不都合を回避することができる。   According to the defrosting operation control shown in FIG. 5 described above, when the compressor operation time is short or when the door opening time is short, when it can be determined that there is little frost adhesion and the defrosting operation is not necessary. By skipping the defrosting operation at each predetermined defrosting interval, energy consumption in the defrosting operation is avoided, the energy consumption of the refrigerator 1 is suppressed, and a smaller threshold is used during the subsequent defrosting cycle. By determining whether or not defrosting is necessary, the inconvenience that defrosting is not performed for a long time can be avoided.

次に、図６を用いて、他の除霜運転制御を説明する。なお、図５と重複する説明は省略するものとする。図６でも第二期間中の積算値は第二閾値を超えていないため、第二期間の最終時間帯では除霜運転は行われない。一方、第三期間の最初の時間帯の圧縮機運転位より積算値が第二閾値を超えるが、第二閾値は除霜周期の最終時間帯に除霜運転を実行するかの判断に用いるものであるため、この時点では除霜運転は実行されない。その後、扉が長時間解放されるなどした結果、積算値が第一閾値を超えると、次の時間帯に除霜運転を開始し、除霜運転の終了後に積算値がゼロにリセットされるとともに、新たに第一期間を開始する。   Next, another defrosting operation control will be described with reference to FIG. In addition, the description which overlaps with FIG. 5 shall be abbreviate | omitted. Also in FIG. 6, since the integrated value during the second period does not exceed the second threshold, the defrosting operation is not performed in the final time zone of the second period. On the other hand, the integrated value exceeds the second threshold value from the compressor operating position in the first time zone of the third period, but the second threshold value is used to determine whether to perform the defrosting operation in the last time zone of the defrosting cycle. Therefore, the defrosting operation is not executed at this time. After that, if the integrated value exceeds the first threshold as a result of the door being opened for a long time, the defrosting operation is started in the next time zone, and the integrated value is reset to zero after the defrosting operation is completed. A new first period starts.

このように、図６の例では、延長期間中に積算値が第一閾値を超え、霜が急激に付着していると判断されたときには、直ちに除霜運転を実施することで、冷却器９ｂの冷却性能を適宜回復させることができる。   As described above, in the example of FIG. 6, when it is determined that the integrated value exceeds the first threshold value during the extension period and the frost is abruptly attached, the defrosting operation is immediately performed, thereby the cooler 9b. The cooling performance can be recovered as appropriate.

図７は、図５、図６で説明した除霜運転制御を、フローチャート表現したものである。Ｓ７０２では、図５、図６の（ａ）〜（ｃ）に示したように、圧縮機運転時間、扉開時間の積算値を求める。次に、Ｓ７０３では、積算値が第一閾値を超えているか判定する。積算値が第一閾値を超えている場合は、霜の付着が急増した予想できるため、直ちに臨時除霜を実行するとともに、積算値をリセットする（Ｓ７０７）。   FIG. 7 is a flowchart representation of the defrosting operation control described in FIGS. 5 and 6. In S702, as shown to (a)-(c) of FIG. 5, FIG. 6, the integrated value of compressor operation time and door opening time is calculated | required. Next, in S703, it is determined whether the integrated value exceeds the first threshold value. When the integrated value exceeds the first threshold value, it can be predicted that frost adhesion has increased rapidly. Therefore, temporary defrosting is immediately performed and the integrated value is reset (S707).

一方、積算値が第一閾値を超えていない場合は、直ちに除霜運転をする必要性が低いと判断できるため、当面は除霜運転を実行しない。   On the other hand, when the integrated value does not exceed the first threshold value, it can be determined that the necessity for immediate defrosting operation is low, and therefore the defrosting operation is not performed for the time being.

しかしながら、前回の除霜運転実行後から所定の時間が経過し、第一期間の最終時間帯、もしくは第二期間、第三期間などの延長期間に入っている場合には、圧縮機９ａの運転時間が短い場合であっても、冷却器９ｂへの霜付着量が多くなっていると考えられるため、積算値が第一閾値よりも小さい第二閾値を超えているかを基準に除霜運転を実施するか判定する（Ｓ７０４、Ｓ７０５）。積算値が第二閾値を超えている場合は、霜の付着量が多くなったと予測できるため、当該除霜周期の最終時間帯に定期除霜を実行するとともに、積算値をリセットする（Ｓ７０６）。   However, if a predetermined time has elapsed since the previous defrosting operation was performed and the first time period is in an extended period such as the second period or the third period, the compressor 9a is operated. Even if the time is short, it is considered that the amount of frost attached to the cooler 9b is increased. Therefore, the defrosting operation is performed based on whether the integrated value exceeds the second threshold value which is smaller than the first threshold value. It is determined whether to implement (S704, S705). When the integrated value exceeds the second threshold value, it can be predicted that the amount of frost attached has increased, so that periodic defrosting is executed in the final time zone of the defrost cycle and the integrated value is reset (S706). .

以上で説明した本実施例の構成のよれば、冷蔵庫１の使用状況に合わせて除霜を実施するので、庫内の温度上昇を抑制できる。また、圧縮機の運転が頻繁に行われて冷却器への着霜が多くなるような状況下では、扉の開時間の多少に関わらず、圧縮機の運転状況に応じて除霜を実施するよう制御を切替えるので、冷却能力の低下を防ぐことができる。総じて食品への影響を抑えることが可能な冷蔵庫を得ることができる。   According to the configuration of the present embodiment described above, defrosting is performed in accordance with the usage state of the refrigerator 1, so that an increase in temperature in the refrigerator can be suppressed. In addition, under circumstances where the compressor is frequently operated and frost formation on the cooler increases, defrosting is performed according to the operation state of the compressor regardless of the opening time of the door. Since the control is switched, it is possible to prevent the cooling capacity from being lowered. As a whole, a refrigerator capable of suppressing the influence on food can be obtained.

１ 冷蔵庫、２ 制御部、３ マイコン、４ メモリ、５ 冷蔵室扉スイッチ、６ 冷凍室扉スイッチ、７ 冷却器温度センサ、８ 外気温温度センサ、９ａ 圧縮機、９ｂ 冷却器、１０ 庫内冷却ファン、１１ 除霜ヒータ、１０１〜１０６ 扉、１０７ 操作パネル、３０１ フィン、３０２ 冷媒配管、３０３ａ、３０３ｂ サイドプレート、３０４ アキユームレータ、３０５ パイプヒータ   1 refrigerator, 2 control unit, 3 microcomputer, 4 memory, 5 refrigerator compartment door switch, 6 freezer compartment door switch, 7 cooler temperature sensor, 8 outside air temperature sensor, 9a compressor, 9b cooler, 10 internal cooling fan , 11 Defrost heater, 101-106 Door, 107 Operation panel, 301 Fin, 302 Refrigerant piping, 303a, 303b Side plate, 304 Accumulator, 305 Pipe heater

Claims (4)

冷蔵室または冷凍室の扉と、
圧縮機と冷却器を有する冷凍サイクルと、
前記冷却器に付着する霜を除霜する除霜手段と、
前記扉の開閉を検知する扉開閉検知手段と、
時間帯毎の前記圧縮機の運転時間を算出する圧縮機運転時間算出手段と、
時間帯毎の前記扉の開時間を算出する扉開時間算出手段と、
圧縮機運転時間および扉開時間を積算した積算値を算出する積算値算出手段と、
を有する冷蔵庫において、
第一期間中に、
前記積算値が第一閾値に達した場合、前記除霜手段による除霜運転を実施し、
前記積算値が第一閾値に達しない場合、前記除霜手段による除霜運転を実施せず、
前記第一期間に続く延長期間中に、
前記積算値が前記第一閾値よりも小さい第二閾値に達した場合、前記除霜手段による除霜運転を実施することを特徴とする冷蔵庫。 A refrigerator or freezer door;
A refrigeration cycle having a compressor and a cooler;
Defrosting means for defrosting frost adhering to the cooler;
Door opening and closing detection means for detecting opening and closing of the door;
Compressor operating time calculating means for calculating the compressor operating time for each time zone;
Door opening time calculating means for calculating the opening time of the door for each time zone;
An integrated value calculating means for calculating an integrated value obtained by integrating the compressor operating time and the door opening time;
In a refrigerator having
During the first period,
When the integrated value reaches the first threshold, the defrosting operation by the defrosting means is performed,
When the integrated value does not reach the first threshold value, the defrosting operation by the defrosting means is not performed,
During the extension period following the first period,
When the integrated value reaches a second threshold value smaller than the first threshold value, a defrosting operation by the defrosting means is performed. 請求項１に記載の冷蔵庫において、
前記延長期間に実施される除霜運転は、前記延長期間を分割した複数の時間帯のうち、最後の時間帯に実施されることを特徴とする冷蔵庫。 The refrigerator according to claim 1,
The defrosting operation performed in the extended period is performed in a last time period among a plurality of time periods obtained by dividing the extended period. 請求項１または２に記載の冷蔵庫において、
前記延長期間中に前記積算値が前記第二閾値に達しない場合、前記除霜手段による除霜運転を実施せず、
当該延長期間後に同じ長さの延長期間を繰り返すことを特徴とする冷蔵庫。 In the refrigerator according to claim 1 or 2,
If the integrated value does not reach the second threshold during the extension period, the defrosting operation by the defrosting means is not performed,
A refrigerator characterized by repeating an extension period of the same length after the extension period. 請求項１から請求項３何れか一項に記載の冷蔵庫において、
前記延長期間中に前記積算値が前記第一閾値に達した場合は、直ちに前記除霜手段による除霜運転を開始することを特徴とする冷蔵庫。 In the refrigerator as described in any one of Claims 1-3,
When the integrated value reaches the first threshold value during the extension period, the defrosting operation by the defrosting unit is immediately started.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110530094A (en) * 2019-10-08 2019-12-03 珠海格力电器股份有限公司 Freezer and its defrosting control method
US11912104B2 (en) * 2018-04-13 2024-02-27 Carrier Corporation Method of defrosting a refrigeration system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11912104B2 (en) * 2018-04-13 2024-02-27 Carrier Corporation Method of defrosting a refrigeration system
CN110530094A (en) * 2019-10-08 2019-12-03 珠海格力电器股份有限公司 Freezer and its defrosting control method

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