JPH0814455B2 - Defrost control device for storage - Google Patents
Defrost control device for storageInfo
- Publication number
- JPH0814455B2 JPH0814455B2 JP2289243A JP28924390A JPH0814455B2 JP H0814455 B2 JPH0814455 B2 JP H0814455B2 JP 2289243 A JP2289243 A JP 2289243A JP 28924390 A JP28924390 A JP 28924390A JP H0814455 B2 JPH0814455 B2 JP H0814455B2
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- JP
- Japan
- Prior art keywords
- defrosting
- signal
- temperature
- time
- storage
- 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.)
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Description
【発明の詳細な説明】 〔発明の目的〕 産業上の利用分野 本発明は、蒸発器の除霜運転の開始及び終了を制御す
る貯蔵庫の除霜制御装置に関する。Description: [Object of the invention] Industrial field of application The present invention relates to a defrosting control device for a storage that controls the start and end of the defrosting operation of an evaporator.
従来の技術 従来此種貯蔵庫の除霜制御装置として、例えば特開昭
63−318444号公報に示す除霜制御装置がある。ここに示
された構成は、外気温を検出する外気温度検出器と、室
外熱交換器の配管温度を検出する配管温度検出器とを備
え、外気温度検出器が検出した温度を入力信号として、
必須暖房運転時間を判定する運転時間設定手段と、必須
除霜時間を判定する除霜時間設定手段と、配管温度検出
器が検出した温度を入力信号として、着霜状態の配管温
度を一定時間測定し着霜を検出する着霜検出測定手段
と、着霜検出測定手段からの測定信号に基づき除霜終了
時の室外熱交換器温度を設定する除霜終了温度設定手段
とを備えたものである。2. Description of the Related Art As a conventional defrost control device for this type of storage, for example, Japanese Patent Laid-Open No.
There is a defrost control device disclosed in Japanese Patent Laid-Open No. 63-318444. The configuration shown here includes an outside air temperature detector that detects the outside air temperature and a pipe temperature detector that detects the pipe temperature of the outdoor heat exchanger, and the temperature detected by the outside air temperature detector as an input signal,
Operating time setting means for determining the required heating operation time, defrosting time setting means for determining the required defrosting time, and the temperature detected by the pipe temperature detector as an input signal, the pipe temperature in the frosted state is measured for a certain period of time. Frost detection measuring means for detecting frost formation, and a defrosting end temperature setting means for setting the outdoor heat exchanger temperature at the end of defrosting based on a measurement signal from the frosting detection measuring means. .
発明が解決しようとする課題 前記構成にあっては、除霜終了温度設定手段により設
定された温度以上になったとき、あるいは除霜時間設定
手段により設定された時間が経過したときの何れか一方
の場合の出力によって除霜運転を終了させるものである
が、設定された温度以上になる前に、設定された時間が
経過する場合として考えられる原因には、後述するいく
つかのものがある。即ち、蒸発器への着霜量が多くて完
全に除霜できなかったとき、あるいは温度センサに異常
があって終了温度以上に至らなかったとき、もしくは除
霜手段が正規に作動しなかったとき等の場合がそれであ
る。このような原因がありながら前記構成では、これら
の原因に対応した解決策を講じることなく、単に除霜運
転を終了させるだけのものであった。このため、貯蔵庫
の周囲温度が通常の温度の時と冬季等低温の時とで、蒸
発器への着霜量が著しく異なるにもかかわらず、周囲状
況の変化に合わせた適切な除霜運転を実行できない問題
や、貯蔵物の種類並びに冷却温度に応じて除霜周期を異
ならせることができず、しかも温度センサの異常を検出
できない問題があった。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above configuration, when the temperature becomes equal to or higher than the temperature set by the defrosting end temperature setting means, or when the time set by the defrosting time setting means elapses. Although the defrosting operation is terminated by the output in the case of, there are several causes described below as possible causes when the set time elapses before the temperature becomes equal to or higher than the set temperature. That is, when the amount of frost on the evaporator cannot be completely defrosted, or when the temperature sensor is abnormal and the temperature does not reach the end temperature or higher, or when the defrosting means does not operate properly. That is the case. Although there are such causes, in the above-described configuration, the defrosting operation is simply ended without taking a solution to these causes. For this reason, even if the amount of frost on the evaporator is significantly different between when the ambient temperature of the storage is normal and when it is low such as in winter, an appropriate defrosting operation that matches the changes in the ambient conditions can be performed. There is a problem that it cannot be executed, the defrosting cycle cannot be changed according to the type of stored material and the cooling temperature, and furthermore, the abnormality of the temperature sensor cannot be detected.
そこで本発明にあっては、貯蔵庫の周囲状況及び庫内
収納物の冷却状況等で変化する除霜運転時間に基づい
て、次回の除霜運転を開始させる時期を変更できるよう
にした貯蔵庫の除霜制御装置を提供するものである。Therefore, in the present invention, based on the defrosting operation time that changes depending on the surrounding conditions of the storage and the cooling status of the items stored in the storage, the defrosting of the storage that can change the time to start the next defrosting operation. A frost control device is provided.
課題を解決するための手段 本発明の貯蔵庫の除霜制御装置は、上述の課題に鑑み
為されたもので、貯蔵庫を冷却する冷凍サイクルに含ま
れた圧縮機の運転時間が設定値を越えたとき除霜開始信
号を出力する除霜開始指令手段と、除霜開始信号により
蒸発器の除霜運転を実行する除霜手段と、除霜開始信号
により起動し所定時間経過後に第１の除霜終了信号を出
力する計時手段と、蒸発器の温度が所定温度以上になっ
たとき第２の除霜終了信号を出力する除霜終了指令手段
と、第１あるいは第２の除霜終了信号の何れか一方の信
号により除霜手段の除霜運転を終了させる制御手段とを
備え、制御手段は、第１の除霜終了信号にて除霜運転を
終了させたときに、除霜開始指令手段の設定値を小さく
するようにしたものである。Means for Solving the Problems The defrost control device for a storage according to the present invention is made in view of the above-mentioned problems, and the operating time of the compressor included in the refrigeration cycle for cooling the storage exceeds the set value. When the defrosting start command means outputs the defrosting start signal, the defrosting means executes the defrosting operation of the evaporator by the defrosting start signal, and the first defrosting is started by the defrosting start signal and after a predetermined time elapses. Any one of the first or second defrosting end signal, the time counting means for outputting the end signal, the defrosting end commanding means for outputting the second defrosting end signal when the temperature of the evaporator becomes equal to or higher than the predetermined temperature. Control means for terminating the defrosting operation of the defrosting means by one of the signals, the control means of the defrosting start command means when the defrosting operation is terminated by the first defrosting end signal. The setting value is reduced.
また、制御装置にて除霜開始指令手段の設定値が小さ
くされた後の除霜運転中に、第１の除霜終了信号が出力
されたときには、計時手段による除霜運転に切り替える
ことで、除霜終了指令手段の異常を判断できるととも
に、異常時における除霜運転終了を指示することができ
る。Further, during the defrosting operation after the set value of the defrosting start command means is reduced by the control device, when the first defrosting end signal is output, by switching to the defrosting operation by the timekeeping means, It is possible to judge the abnormality of the defrosting termination instruction means and to instruct the termination of the defrosting operation at the time of abnormality.
作用 制御手段が、第１の除霜終了信号に基づいて除霜運転
を終了させたときには、除霜開始指令手段の設定値を小
さくするため、冷却運動再開から次回の除霜運転開始ま
での時間を短くするように作用する。When the operation control unit ends the defrosting operation based on the first defrosting end signal, the time from the restart of the cooling motion to the start of the next defrosting operation is set to reduce the set value of the defrosting start instruction unit. Acts to shorten.
また、除霜開始指令手段の設定値を小さくした後の除
霜運転中において、計時手段より第１の除霜終了信号が
出力されたときには、制御手段が除霜終了指令手段に何
らかの異常があったものと判断し、除霜終了時期の決定
を計時手段だけによるものに移行させることから、制御
手段は、除霜終了指令手段の異常を検出する異常検出部
として作用する。Further, during the defrosting operation after reducing the set value of the defrosting start instruction means, when the first defrosting end signal is output from the timing means, the control means has some abnormality in the defrosting end instruction means. Since the determination of the end of defrosting is made and the determination of the end time of defrosting is made to shift to that of only the timekeeping means, the control means acts as an abnormality detecting section for detecting an abnormality of the defrosting end instruction means.
実施例 以下図面に基づき本発明の実施例を説明する。Embodiment An embodiment of the present invention will be described below with reference to the drawings.
１は冷凍冷蔵庫等の貯蔵庫を冷却する冷凍サイクルで
あって、圧縮機2,凝縮器3,減圧手段４及び蒸発器５を備
える。Reference numeral 1 is a refrigeration cycle for cooling a storage such as a freezer-refrigerator, which includes a compressor 2, a condenser 3, a pressure reducing means 4 and an evaporator 5.
10は冷凍サイクル中の蒸発器５に付着した霜を強制的
に除去するための除霜制御装置であり、圧縮機２の運転
時間（即ちON時間）が設定値TON（例えば８時間）を越
えたとき除霜開始信号を出力するタイマー等の除霜開始
指令手段11と、除霜開始信号により蒸発器５の除霜運転
を実行する加熱ヒータ等の除霜手段12と、除霜開始信号
により起動して所定時間T1（例えば50分）経過後に第１
の除霜終了信号を出力するタイマー等の計時手段13と、
蒸発器５の空気出口側に配設され蒸発器５の温度が所定
温度ts（例えば５℃）以上になったとき、第２の除霜終
了信号を出力する負特性サーミスタにて代表される温度
センサ等の除霜終了指令手段14と、前記第１あるいは第
２の除霜終了信号の何れか一方の信号により前記除霜手
段12の除霜運転を終了させる制御手段15とを備えてい
る。尚、本実施例においては、除霜開始指令手段11,計
時手段13及び制御手段15は、マイクロコンピュータに組
み込まれているものとする。Reference numeral 10 is a defrost control device for forcibly removing frost attached to the evaporator 5 during the refrigeration cycle, and the operation time (that is, ON time) of the compressor 2 has a set value T ON (for example, 8 hours). Defrosting start command means 11 such as a timer that outputs a defrosting start signal when it exceeds, defrosting means 12 such as a heater that executes the defrosting operation of the evaporator 5 by the defrosting start signal, and a defrosting start signal After starting for a predetermined time T 1 (eg 50 minutes), the first
A time measuring means 13 such as a timer for outputting a defrosting end signal of
This is represented by a negative characteristic thermistor which is arranged on the air outlet side of the evaporator 5 and outputs a second defrosting completion signal when the temperature of the evaporator 5 exceeds a predetermined temperature t s (for example, 5 ° C.). A defrosting end commanding means 14 such as a temperature sensor, and a control means 15 for ending the defrosting operation of the defrosting means 12 by one of the first and second defrosting end signals. . In the present embodiment, the defrosting start command means 11, the timing means 13 and the control means 15 are incorporated in a microcomputer.
制御手段15は、除霜開始指令手段11から除霜開始信号
が出力されたとき、除霜終了指令手段14から第２の除霜
終了手段が出力されていないことを確認した後、計時手
段13に計時開始指令を出力するとともに除霜手段12を動
作させる。そして除霜手段12にて除霜運動が開始され
て、蒸発器５の温度が設定温度ts以上になったとき除霜
終了指令手段14から出力される第２の除霜終了信号、若
しくは、計時手段13から出力される第１の除霜終了信号
の何れかの一方の信号を入力したとき、制御手段15は、
除霜手段12の除霜運転を終了させて圧縮機２を駆動して
冷却運転に復帰させるとともに、除霜開始指令手段11及
び計時手段13をリセットする。When the defrosting start command means 11 outputs the defrosting start signal, the control means 15 confirms that the defrosting end command means 14 does not output the second defrosting end means, and then the clock means 13 The defrosting means 12 is operated while outputting the clocking start command to. Then, when the defrosting movement is started by the defrosting means 12 and the temperature of the evaporator 5 becomes equal to or higher than the set temperature t s , the second defrosting end signal output from the defrosting end command means 14, or When any one of the first defrosting end signals output from the timing means 13 is input, the control means 15
The defrosting operation of the defrosting means 12 is ended, the compressor 2 is driven to return to the cooling operation, and the defrosting start command means 11 and the time counting means 13 are reset.
尚、通常状態を対象として、蒸発器５が所定温度以上
になるまでに要する時間が、所定時間T1よりも小さくな
るようにヒータ加熱容器及び所定時間を設定している
が、蒸発器への着霜量が多くて完全に除霜できなかった
とき、あるいは温度センサに異常があって終了温度以上
に至らなかったとき、もしくは除霜手段が正規に作動し
なかったとき等、通常状態とは異なる状況となった場合
には、第２の除霜終了信号が出力される前に計時手段13
から第１の除霜終了信号が出力される。Note that the heater heating container and the predetermined time are set so that the time required for the evaporator 5 to reach the predetermined temperature or higher is smaller than the predetermined time T 1 for the normal state. When the amount of frost is too large to completely defrost, or when the temperature sensor is abnormal and the temperature does not reach the end temperature or higher, or when the defrosting means does not operate properly, the normal state is defined. In the case of a different situation, the timing means 13 is output before the second defrosting end signal is output.
Outputs a first defrosting end signal.
そこで、この第１の除霜終了信号が出力されたときに
は、それを記憶し、除霜制御装置10に異常が発生したか
否かを検出するために、除霜開始指令手段設11の定値T
ONを初期値（本例では８時間）よりも小さい値に変更す
る。変更値は、初期値の半分以下に設定することが望ま
しく、本実施例では例えばTON/4とする。そして、冷却
運転再開後、圧縮機２の運転時間がこの変更値以上とな
ったときには、再度除霜運転を行う。このときにも、計
時手段13から第１の除霜終了信号が出力されたときに
は、制御手段15が、除霜終了指令手段14等の制御対象部
品に何らかの異常があったものと判断して、異常の報知
を行うようにしたものである。Therefore, when the first defrosting end signal is output, the fixed value T of the defrosting start command means 11 is stored in order to store it and detect whether or not an abnormality has occurred in the defrosting control device 10.
ON is changed to a value smaller than the initial value (8 hours in this example). The changed value is preferably set to half or less of the initial value, and is T ON / 4 in this embodiment. Then, after the cooling operation is restarted, when the operation time of the compressor 2 becomes equal to or greater than the change value, the defrosting operation is performed again. Also at this time, when the first defrosting end signal is output from the time counting means 13, the control means 15 determines that there is some abnormality in the controlled object parts such as the defrosting end command means 14, The notification of abnormality is made.
以上の構成に基づき除霜制御装置10の動作説明を行な
う。だたし、貯蔵庫内には保冷物品が適宜収納され、庫
内温度tkは所望の温度toffをはるかに上回っているもの
とする。The operation of the defrost control device 10 will be described based on the above configuration. However, it is assumed that cold storage articles are appropriately stored in the storage, and the internal temperature t k is far higher than the desired temperature t off .
（ｉ）tk＞toffであることから、冷却運転制御手段（図
示せず）がON信号を出力して、圧縮機モータが運転状態
となり、庫内を所望の温度迄引き下げる冷却運転（即ち
プルダウン運転）を行なう一方、除霜開始指令手段11が
計時動作を開始する。(I) Since t k > t off , the cooling operation control means (not shown) outputs an ON signal, the compressor motor enters the operating state, and the cooling operation for lowering the inside temperature to the desired temperature (ie, While performing the pull-down operation), the defrosting start command means 11 starts the time counting operation.
（ii）冷却運転により温度検知手段21にて検知された庫
内温度tkが所望の温度toffを一定温度（本例では１℃と
する）だけ下回ると、冷却運転制御手段OFF信号を出力
し、モータを停止させ、冷却を停止するとともに、除霜
開始指令手段11が計時動作を一時停止する。(Ii) When the internal temperature t k detected by the temperature detecting means 21 during the cooling operation falls below the desired temperature t off by a certain temperature (1 ° C. in this example), the cooling operation control means OFF signal is output. Then, the motor is stopped, the cooling is stopped, and the defrosting start command means 11 temporarily stops the time counting operation.
（iii）冷却停止により庫内温度tkが所望の温度を１℃
だけ上回ると、冷却運転制御手段が再びON信号出力し
て、圧縮機モータが運転状態となり、庫内の冷却運転を
行なうとともに除霜終了指令手段11が計時動作を再開す
る（この時点からサーモサイクル運転における冷却が開
始する）。(Iii) When the cooling is stopped, the internal temperature t k becomes the desired temperature of 1 ° C.
When the temperature exceeds this value, the cooling operation control means outputs the ON signal again, the compressor motor enters the operating state, the inside cooling operation is performed, and the defrosting end instruction means 11 restarts the timing operation (thermocycle from this point). Cooling in operation begins).
（iv）このサーモサイクル運転における冷却により、庫
内温度tkが所望の温度toffを１℃だけ下回ると、冷却運
転制御手段はOFF信号を出力するため、圧縮機モータが
停止して冷却を停止するとともに、除霜開始指令手段11
が計時動作を一時停止する。(Iv) When the internal temperature t k falls below the desired temperature t off by 1 ° C. due to the cooling in this thermocycle operation, the cooling operation control means outputs an OFF signal, so that the compressor motor is stopped and cooling is performed. Stop and defrost start command means 11
Stops the timekeeping operation.
（ｖ）以下上述の（iii）（iv）の動作を繰り返して、
庫内温度の所望の温度を上下１℃のディファレンシャル
でもって冷却しつつ、除霜開始指令手段11は計時動作を
繰り返し行う。(V) Repeating the above-mentioned operations (iii) and (iv),
The defrosting start instruction means 11 repeats the time counting operation while cooling the desired temperature of the inside of the refrigerator with the differential of 1 ° C. above and below.
（vi）そして、除霜開始指令手段11による計時時間が設
定値TONになると、除霜開始信号が出力されて、除霜手
段12による除霜運転が実行される。(Vi) When the time measured by the defrosting start command means 11 reaches the set value T ON , the defrosting start signal is output and the defrosting operation by the defrosting means 12 is executed.
次に、この除霜運転について、第２図のフローチャー
トに基づいてその制御動作を説明する。Next, the control operation of this defrosting operation will be described based on the flowchart of FIG.
まず、ステップS1にて除霜開始指令即ち除霜開始信号
が出力されたか否かが判断され、出力されていなければ
ステップS1へ戻り、出力されていれば計時手段13の計時
動作即ち所定時間T1からの減算動作を開始して、ステッ
プS2にて除霜終了指令即ち第２の除霜終了信号が出力さ
れているか否かが判断される。First, in step S 1, it is determined whether or not a defrosting start command, that is, a defrosting start signal is output. If it is not output, the process returns to step S 1; The subtraction operation from the time T 1 is started, and it is determined in step S 2 whether or not the defrosting end command, that is, the second defrosting end signal is output.
次に、第２の除霜終了信号が出力されていれば、ステ
ップS3にて除霜終了の解除即ち除霜開始指令手段11及び
計時手段13をリセットし、ステップS4で除霜手段として
の除霜ヒータ12の通電をOFFしてステップS1へ復帰す
る。Then, if the second defrost termination signal is output, the defrosting completion of release i.e. defrosting start command means 11 and counting means 13 is reset in step S 3, the defrosting means in step S 4 Turn off the power supply to the defrost heater 12 and return to step S 1 .
一方、第２の除霜終了信号が出力されていなければ、
ステップS11にて計時手段13の減算動作が終了したか否
かを判断し、終了していなければステップS19へ移行し
て（T1−１）をT1に置き換え、ステップS20で除霜ヒー
タ12への通電を開始即ちONさせてステップS1へ復帰す
る。On the other hand, if the second defrosting end signal is not output,
It is determined whether the subtraction operation of the time measuring means 13 has been completed in step S 11, replacing the operation proceeds to Step S 19 if not terminated (T 1 -1) to T 1, divided by the step S 20 The power supply to the frost heater 12 is started, that is, turned on, and the process returns to step S 1 .
そして、計時手段13の減算動作が終了していれば、ス
テップS12にて除霜指令の解除即ち除霜開始指令手段11
及び計時手段13をリセットし、ステップS13で除霜ヒー
タ12への通電をOFFし、ステップS14で除霜開始指令手段
11の設定値を初期値TONの４分の１に変更してセット即
ち計時動作を開始させ、ステップS15で圧縮機２を起動
させて冷却運転を再開させる。即ち上述の（ｉ）〜（i
i）の動作を行う。このため、計時手段13による第１の
除霜終了信号にて除霜ヒータ12の除霜運転を終了させた
ときには、除霜終了指令手段11の設定値を小さくして、
異常を検知するためのモードに移行することとなる。Then, if the subtraction operation of the time measuring means 13 has been completed, release i.e. defrosting start command means defrosting command at step S 12 11
And resets the timer means 13, and OFF the power supply to the defrosting heater 12 in step S 13, the defrosting start command means in step S 14
The setting value of 11 is changed to 1/4 of the initial value T ON to start the set operation, that is, the time counting operation, and in step S 15 , the compressor 2 is activated to restart the cooling operation. That is, (i) to (i
Perform the operation of i). Therefore, when the defrosting operation of the defrosting heater 12 is terminated by the first defrosting termination signal from the timing means 13, the set value of the defrosting termination command means 11 is reduced,
The mode shifts to the mode for detecting an abnormality.
次に、ステップS16で計時時間ＴがTON/4以上であるか
否かが判断され、Ｔ＜（TON/4）のとき、ステップS16を
繰り換し、Ｔ≧（TON/4）のとき、ステップS17で除霜開
始指令手段11から除霜開始信号が出力され、ステップS
18で除霜ヒータ12をONさせステップS21へ移行する。Then, the counted time T in step S 16 it is determined whether it is T ON / 4 or more, T <time (T ON / 4), and conversion repeated a step S 16, T ≧ (T ON / 4), the defrosting start command means 11 outputs a defrosting start signal in step S 17 ,
The defrost heater 12 is turned on at 18 and the process proceeds to step S 21 .
ステップS21では、第２の除霜終了信号が出力された
か否かが判断され、出力されていればステップS3へ移行
し、出力されていなければステップS22にて計時手段13
の減算動作が終了したか否かを判断し、終了していなけ
ればステップS25へ移行して（T1−１）をT1に置き換え
ステップS21へ復帰し、終了していればステップS23で除
霜ヒータをOFFし、ステップS24で異常発生と判断して報
知装置（図示せず）により報知させてステップS1へ復帰
する。このため、計時手段13から２回続けて除霜終了信
号が出力された場合には、制御対象部品に何らかの異常
があったものと判断して、異常を報知することができ
る。In step S 21, whether the second defrosting completion signal is output is determined, the process proceeds to Step S 3 if the output, time measuring means at step S 22 if it is not output 13
It is determined whether the subtraction operation is completed, the operation proceeds to Step S 25 if not terminated (T 1 -1) and returns to step S 21 replaced by T 1, step S if it has been completed the defrosting heater is OFF at 23, by notification by the notification unit determines that an abnormality occurs in the step S 24 (not shown) to return to step S 1. Therefore, when the defrosting end signal is output from the timekeeping means 13 twice in succession, it is possible to determine that there is some abnormality in the control target component and notify the abnormality.
尚、制御手段15が、この報知動作に合わせて除霜終了
指令手段14への入出力を行わないようにしておけば、異
常発生時には、自動的に計時手段13だけ除霜終了信号に
よって除霜運転を終了するフェイルセーフ運転に移行す
ることとなる。If the control means 15 does not perform input / output to / from the defrosting end commanding means 14 in accordance with this notification operation, when an abnormality occurs, only the timekeeping means 13 automatically defrosts by the defrosting end signal. The operation will be switched to fail-safe operation, which ends the operation.
以上詳細の如く本発明の請求項１によれば、計時手段
の出力により除霜手段の除霜運転を終了させたときに
は、冷却運転復帰から次回の除霜運転開始までの時間が
短縮され、着霜量が大幅に増大しないうちに除霜運転を
実行することができ、次回の除霜運転で着霜を除去しや
すくなる。As described above in detail, according to claim 1 of the present invention, when the defrosting operation of the defrosting means is terminated by the output of the timing means, the time from the return of the cooling operation to the start of the next defrosting operation is shortened, and The defrosting operation can be executed before the amount of frost greatly increases, and frost formation can be easily removed in the next defrosting operation.
また請求項２によれば、計時手段から２回続けて除霜
終了信号が出力されたときに、制御手段の制御対象部品
に異常が発生したものと判断するため、異常の報知及び
除霜運転の終了タイミングを計時手段だけの出力信号に
移行するフェイルセーフ運転が可能となる。Further, according to claim 2, when the defrosting end signal is output from the timing means twice in succession, it is determined that an abnormality has occurred in the control target component of the control means. Therefore, the abnormality is notified and the defrosting operation is performed. It becomes possible to perform a fail-safe operation in which the end timing of is shifted to the output signal of only the time measuring means.
各図は本発明の一実施例を示し、第１図は除霜制御装置
のブロック回路図、第２図は除霜運転の動作の流れを説
明するフローチャート、第３図は冷媒回路図である。 １……冷凍サイクル、２……圧縮機、５……蒸発器、10
……除霜制御装置、11……除霜開始指令手段、12……除
霜手段、13……計時手段、14……除霜終了指令手段、15
……制御手段。Each drawing shows an embodiment of the present invention, FIG. 1 is a block circuit diagram of a defrosting control device, FIG. 2 is a flow chart for explaining the flow of the operation of the defrosting operation, and FIG. 3 is a refrigerant circuit diagram. . 1 ... Refrigeration cycle, 2 ... Compressor, 5 ... Evaporator, 10
... Defrost control device, 11 ... Defrost start command means, 12 ... Defrost means, 13 ... Timekeeping means, 14 ... Defrost end command means, 15
...... Control means.
Claims (2)
圧縮機の運転時間が設定値を越えたとき除霜開始信号を
出力する除霜開始指令手段と、前記除霜開始信号により
蒸発器の除霜運転を実行する除霜手段と、前記除霜開始
信号により起動して所定時間経過後に第１の除霜終了信
号を出力する計時手段と、前記蒸発器の温度が所定温度
以上になったとき第２の除霜終了信号を出力する除霜終
了指令手段と、前記第１あるいは第２の除霜終了信号の
何れか一方の信号により前記除霜手段の除霜運転を終了
させる制御手段とを備え、制御手段は、前記第１の除霜
終了信号にて除霜運転を終了させたときに、前記除霜開
始指令手段の設定値を小さくしてなる貯蔵庫の除霜制御
装置。1. A defrosting start command means for outputting a defrosting start signal when the operating time of a compressor included in a refrigerating cycle for cooling a storage exceeds a set value, and an evaporator by the defrosting start signal. The defrosting means for executing the defrosting operation, the clocking means for starting by the defrosting start signal and outputting the first defrosting end signal after a lapse of a predetermined time, and the temperature of the evaporator becomes equal to or higher than the predetermined temperature. A defrosting end command means for outputting a second defrosting end signal, and a control means for ending the defrosting operation of the defrosting means by one of the first and second defrosting end signals. The defrosting control device for a storage, wherein the control means reduces the set value of the defrosting start command means when the defrosting operation is terminated by the first defrosting termination signal.
信号が出力されたときには、除霜終了指令手段の異常と
判断して計時手段による除霜運転に切り替えることを特
徴とする請求項１記載の貯蔵庫の除霜制御装置。2. When the first defrosting end signal is output after the set value has been reduced, it is judged that the defrosting end command means is abnormal, and the timekeeping means is switched to the defrosting operation. The defrosting control device for a storage according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2289243A JPH0814455B2 (en) | 1990-10-26 | 1990-10-26 | Defrost control device for storage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2289243A JPH0814455B2 (en) | 1990-10-26 | 1990-10-26 | Defrost control device for storage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04161776A JPH04161776A (en) | 1992-06-05 |
| JPH0814455B2 true JPH0814455B2 (en) | 1996-02-14 |
Family
ID=17740634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2289243A Expired - Fee Related JPH0814455B2 (en) | 1990-10-26 | 1990-10-26 | Defrost control device for storage |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0814455B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015129315A1 (en) * | 2014-02-28 | 2015-09-03 | シャープ株式会社 | Refrigerator |
-
1990
- 1990-10-26 JP JP2289243A patent/JPH0814455B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015129315A1 (en) * | 2014-02-28 | 2015-09-03 | シャープ株式会社 | Refrigerator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04161776A (en) | 1992-06-05 |
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