JPH04295577A - Method of temperature-controlling and defrosting for refrigerating showcase - Google Patents
Method of temperature-controlling and defrosting for refrigerating showcaseInfo
- Publication number
- JPH04295577A JPH04295577A JP6001191A JP6001191A JPH04295577A JP H04295577 A JPH04295577 A JP H04295577A JP 6001191 A JP6001191 A JP 6001191A JP 6001191 A JP6001191 A JP 6001191A JP H04295577 A JPH04295577 A JP H04295577A
- Authority
- JP
- Japan
- Prior art keywords
- defrosting
- showcases
- refrigerated
- temperature
- showcase
- 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.)
- Pending
Links
- 238000010257 thawing Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000003507 refrigerant Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Landscapes
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Defrosting Systems (AREA)
- Feedback Control In General (AREA)
- Control Of Temperature (AREA)
- Freezers Or Refrigerated Showcases (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、冷蔵ショーケースの庫
内温度調節と冷却装置の除霜の方法に関するものである
。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the internal temperature of a refrigerated showcase and defrosting a cooling device.
【０００２】0002
【従来の技術】冷蔵ショーケースは周知のごとく冷凍装
置を備え、商品収納庫内に要冷蔵商品を収納して冷凍装
置で庫内温度を一定に保持するものであるが、スーパー
マーケットや食品店舗など複数台の冷蔵ショーケースを
設置するところでは、庫内に収納する商品の種類や量な
どの条件により、保冷のための庫内温度が各冷蔵ショー
ケース毎に異なる。また、各冷蔵ショーケースに設置し
てある冷凍装置の一部を構成する冷却器は、冷却運転が
進行するにしたがい、ここに吸込まれる湿気を含んだ外
気により着霜し、次第に冷却能力が低下してくるため、
一定のサイクルで除霜を行う必要がある。この場合も、
複数台の冷蔵ショーケースでは、各々の冷蔵ショーケー
スが設置されている場所の外部条件や商品の出入れが頻
繁に行われるかどうかなどの条件により冷蔵ショーケー
ス毎に着霜の程度が異なり、除霜のサイクルが異なる。[Prior Art] As is well known, a refrigerated showcase is equipped with a refrigeration device, stores products that need to be refrigerated in the product storage compartment, and uses the refrigeration device to maintain the internal temperature at a constant level. In places where a plurality of refrigerated showcases are installed, the internal temperature for cold storage differs for each refrigerated showcase depending on conditions such as the type and amount of products stored in the refrigerator. In addition, as the cooling operation progresses, the coolers that form part of the refrigeration equipment installed in each refrigerated showcase become frosted due to the moisture-laden outside air sucked in, and the cooling capacity gradually decreases. Because it is decreasing,
It is necessary to defrost in a certain cycle. In this case too,
In the case of multiple refrigerated showcases, the degree of frost formation varies depending on conditions such as the external conditions of the location where each refrigerated showcase is installed and whether products are frequently taken in and out. Different defrost cycles.
【０００３】そこで、従来は庫内温度を各冷蔵ショーケ
ース毎に一定の温度に保持するための手段として、例え
ば図２に示すように、各冷蔵ショーケース１ａ〜１ｎ毎
に温度調整装置１０ａ〜１０ｎを設けている。この温度
調整装置１０ａ〜１０ｎは、ＡＣ１００Ｖの電源に接続
され、各冷蔵ショーケース１ａ〜１ｎ毎に設定した設定
値以下に庫内温度が低下すると開く接点を有し、冷媒回
路に設けた電磁弁４ａ〜４ｎが電源との間に接続される
。Therefore, conventionally, as a means for maintaining the internal temperature at a constant temperature for each refrigerated showcase, for example, as shown in FIG. 10n is provided. The temperature adjustment devices 10a to 10n are connected to an AC 100V power source, have contacts that open when the temperature inside the refrigerator falls below a set value set for each refrigerated showcase 1a to 1n, and have electromagnetic valves provided in the refrigerant circuit. 4a to 4n are connected between the power supply and the power supply.
【０００４】また、除霜の手段としては、各冷蔵ショー
ケース１ａ〜１ｎ毎にそれぞれ一定の時間毎に接点が開
閉するタイマ１１ａ〜１１ｎを設ける。該タイマ１１ａ
〜１１ｎの接点はＡＣ１００ Ｖの電源と温度調整装置
１０ａ〜１０ｎとの間に挿入接続されるとともに、タイ
マリレーは電源に対し温度調整装置１０ａ〜１０ｎと並
列接続となる。Further, as means for defrosting, timers 11a to 11n are provided for each of the refrigerated showcases 1a to 1n, the contacts of which open and close at regular intervals. The timer 11a
The contacts 11n are inserted and connected between the AC 100 V power supply and the temperature adjustment devices 10a to 10n, and the timer relays are connected in parallel to the power supply and the temperature adjustment devices 10a to 10n.
【０００５】次に動作について説明する。複数台の冷蔵
ショーケース１ａ〜１ｎのうち、冷蔵ショーケース１ａ
を例に説明すると、冷却運転時には、電磁弁４ａに通電
されこれが開いて冷媒回路内の冷媒が冷却器に送られ、
ここで行われる冷却作用により冷蔵ショーケースの商品
収納庫が所定の温度に冷却される。そして、冷却が進み
、庫内温度が低下して温度調整装置１０ａの設定値以下
にまで下がると、温度調整装置１０ａの接点が開いて、
冷媒回路の電磁弁４ａへの通電が断たれこれが閉じて、
冷却器へ冷媒が送られなくなり冷却運転が一時停止する
。
その結果、庫内温度が上昇し、これが設定値以上になる
と温度調整装置１０ａの接点が再び閉じ電磁弁４ａに通
電されこれが開いて冷却運転が再開する。このようにし
て電磁弁４ａの開閉を繰返して庫内温度を設定値に保持
する。Next, the operation will be explained. Among the multiple refrigerated showcases 1a to 1n, the refrigerated showcase 1a
For example, during cooling operation, the solenoid valve 4a is energized and opened, and the refrigerant in the refrigerant circuit is sent to the cooler.
The cooling action performed here cools the product storage in the refrigerated showcase to a predetermined temperature. When the cooling progresses and the temperature inside the refrigerator drops to below the set value of the temperature adjustment device 10a, the contacts of the temperature adjustment device 10a open,
The energization to the solenoid valve 4a of the refrigerant circuit is cut off and it closes.
Refrigerant is no longer sent to the cooler and cooling operation temporarily stops. As a result, the temperature inside the refrigerator rises, and when the temperature exceeds the set value, the contacts of the temperature adjustment device 10a close again and the solenoid valve 4a is energized, which opens and the cooling operation resumes. In this way, the solenoid valve 4a is repeatedly opened and closed to maintain the internal temperature at the set value.
【０００６】一方、冷却運転の開始と同時にタイマ１１
ａがカウントを開始し、予め設定された所定の時間が経
過すると、タイマ１１ａの接点が開き、冷媒回路の電磁
弁４ａが閉じてオフサイクルによる冷却器の除霜が行わ
れる。そして、予め設定した除霜運転時間が経過すると
タイマ１１ａの接点が復帰し、冷媒回路の電磁弁４ａが
開き、除霜運転が終了して冷却運転が開始する。On the other hand, at the same time as the cooling operation starts, the timer 11
a starts counting, and when a preset predetermined time has elapsed, the contact of the timer 11a opens, the solenoid valve 4a of the refrigerant circuit closes, and the cooler is defrosted by an off cycle. Then, when the preset defrosting operation time has elapsed, the contact of the timer 11a returns, the solenoid valve 4a of the refrigerant circuit opens, the defrosting operation ends, and the cooling operation starts.
【０００７】[0007]
【発明が解決しようとする課題】このように温度調整の
ための回路と除霜のための回路とがそれぞれ別系統のも
のとして回路構成され電源に接続されているため、複数
台の冷蔵ショーケースが設置される場合に各冷蔵ショー
ケース毎に除霜サイクルが異なると温度調整の回路に加
えて、さらに除霜の回路として各ショーケース毎にタイ
マを設置し複数本の配線工事を行う必要があり、設置工
事に手数を要した。[Problem to be Solved by the Invention] Since the circuit for temperature adjustment and the circuit for defrosting are each configured as separate circuits and connected to the power supply, it is difficult to use multiple refrigerated showcases. If a defrost cycle is different for each refrigerated showcase when a refrigerated showcase is installed, in addition to the temperature adjustment circuit, it is necessary to install a timer for each showcase as a defrost circuit and perform multiple wiring work. However, the installation work required a lot of effort.
【０００８】本発明の目的は前記従来例の不都合を解消
し、庫内温度や除霜サイクルが異なる複数台の冷蔵ショ
ーケースを設置する場合に、除霜については各冷蔵ショ
ーケース毎にタイマを有する除霜回路を設けずにすみ、
配線工事を簡略でき、しかも温調と除霜とを１つの制御
装置で制御できる冷蔵ショーケースの温調・除霜方法を
提供することにある。An object of the present invention is to eliminate the disadvantages of the conventional example, and to set up a timer for each refrigerated showcase for defrosting when a plurality of refrigerated showcases with different internal temperatures and defrosting cycles are installed. There is no need to install a defrosting circuit with
To provide a temperature control/defrosting method for a refrigerated showcase that can simplify wiring work and control both temperature control and defrost with one control device.
【０００９】[0009]
【課題を解決するための手段】本発明は前記目的を達成
するため、複数の冷蔵ショーケース毎にそれぞれ庫内温
度検知器と、制御装置とを設け、庫内温度検知器から制
御装置への出力信号に基いて制御装置で各冷蔵ショーケ
ース毎にその庫内温度を調整し、また、複数の冷蔵ショ
ーケースに対して共用のパルス信号発信器を設け、ここ
から各制御装置へ出力される除霜開始または終了のパル
ス信号が当該冷蔵ショーケースに対するものである場合
に、当該冷蔵ショーケースの冷媒回路に設けた電磁弁を
閉じまたは開くことを要旨とするものである。[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides an internal temperature detector and a control device for each of a plurality of refrigerated showcases, and connects the internal temperature sensor to the control device. Based on the output signal, the control device adjusts the internal temperature of each refrigerated showcase, and a common pulse signal transmitter is provided for multiple refrigerated showcases, from which the signal is output to each control device. The gist of this is to close or open a solenoid valve provided in the refrigerant circuit of the refrigerated showcase when a pulse signal for starting or ending defrosting is directed to the refrigerated showcase.
【００１０】0010
【作用】本発明によれば、庫内温度や除霜サイクルが異
なる複数台の冷蔵ショーケースに対して、庫内温度の調
整は、各冷蔵ショーケース毎に設けた温度検知器からの
出力に基いて各冷蔵ショーケース毎にリアルタイムで行
われる。一方、除霜は各冷蔵ショーケース毎に除霜サイ
クルが予め設定されるので、１個のパルス発信器から複
数台全ての冷蔵ショーケースに対して除霜開始、終了の
パルス信号が常時発信されており、各冷蔵ショーケース
では入力したパルス信号が当該ショーケースに対するも
のであると制御装置で判断された場合に除霜を開始また
は終了する。よって除霜回路は１個のパルス発信器と各
冷蔵ショーケースとを信号線で接続するだけで足りる。[Operation] According to the present invention, for multiple refrigerated showcases with different internal temperatures and defrosting cycles, the internal temperature can be adjusted based on the output from the temperature detector provided for each refrigerated showcase. This is done in real time for each refrigerated showcase. On the other hand, for defrosting, the defrosting cycle is set in advance for each refrigerated showcase, so one pulse transmitter constantly sends pulse signals to start and end defrosting to all multiple refrigerated showcases. In each refrigerated showcase, defrosting is started or ended when the control device determines that the input pulse signal is for that showcase. Therefore, it is sufficient for the defrosting circuit to connect one pulse transmitter and each refrigerated showcase with a signal line.
【００１１】[0011]
【実施例】以下、図面について本発明の実施例を詳細に
説明する。図１は本発明の冷蔵ショーケースの温調・除
霜方法の実施例を示す回路図で、図中、前記図２に示し
た従来例と同一の構成要素には同一の参照符号を付して
ある。本発明では複数の冷蔵ショーケース１ａ，１ｂ〜
１ｎに対して各冷蔵ショーケース１ａ，１ｂ〜１ｎ毎に
庫内温度検知器としてサーミスタ２ａ，２ｂ〜２ｎを設
け、また、従来周知のマイクロコンピュータを用いる温
調・除霜の制御装置３ａ，３ｂ〜３ｎを設ける。この制
御装置３ａ，３ｂ〜３ｎは、除霜開始または終了のパル
ス信号の送受信回路５ａ，５ｂ〜５ｎ、庫内温度や当該
冷蔵ショーケースを特定するためのアドレス番号の設定
を行う設定部６ａ，６ｂ〜６ｎ、中央処理装置７ａ，７
ｂ〜７ｎ、入出力回路８ａ，８ｂ〜８ｎとにより構成さ
れる。また、入出力回路８ａ，８ｂ〜８ｎにはサーミス
タ２ａ，２ｂ〜２ｎや冷媒回路の電磁弁４ａ，４ｂ〜４
ｎが接続されて温度調整回路が形成される。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a circuit diagram showing an embodiment of the temperature control/defrosting method for a refrigerated showcase according to the present invention. In the figure, the same components as in the conventional example shown in FIG. 2 are given the same reference numerals. There is. In the present invention, a plurality of refrigerated showcases 1a, 1b to
1n, thermistors 2a, 2b to 2n are provided as internal temperature detectors for each refrigerated showcase 1a, 1b to 1n, and temperature control/defrosting control devices 3a, 3b using conventionally well-known microcomputers. ~3n is provided. The control devices 3a, 3b to 3n include transmitting/receiving circuits 5a, 5b to 5n for pulse signals for starting or ending defrosting, a setting unit 6a for setting the internal temperature and an address number for specifying the refrigerated showcase; 6b to 6n, central processing units 7a, 7
b to 7n, and input/output circuits 8a and 8b to 8n. In addition, the input/output circuits 8a, 8b to 8n include thermistors 2a, 2b to 2n and solenoid valves 4a, 4b to 4 of the refrigerant circuit.
n are connected to form a temperature adjustment circuit.
【００１２】また、送受信回路５ａ，５ｂ〜５ｎに各冷
蔵ショーケース１ａ，１ｂ〜１ｎに対して共用の１個の
パルス信号発信器（図示せず）が信号線９で接続されて
入出力回路８ａ，８ｂ〜８ｎや電磁弁４ａ，４ｂ〜４ｎ
とで除霜回路が形成される。この場合、前記パルス信号
発信器には全ての冷蔵ショーケース１ａ，１ｂ〜１ｎの
除霜サイクルが予め設定され、全ての冷蔵ショーケース
１ａ，１ｂ〜１ｎの除霜開始及び終了のパルス信号を発
信するよう構成されている。Furthermore, one pulse signal generator (not shown) which is shared by each of the refrigerated showcases 1a, 1b-1n is connected to the transmitting/receiving circuits 5a, 5b-5n by a signal line 9 to form an input/output circuit. 8a, 8b-8n and solenoid valve 4a, 4b-4n
A defrosting circuit is formed. In this case, the defrosting cycles of all the refrigerated showcases 1a, 1b to 1n are set in advance in the pulse signal transmitter, and the pulse signal to start and end defrosting of all the refrigerated showcases 1a, 1b to 1n is transmitted. is configured to do so.
【００１３】次に動作について説明する。まず、庫内温
度の調整方法を冷蔵ショーケース１ａについて説明する
と、電源が投入されると中央処理装置７ａの働きで入出
力回路８ａから電磁弁４ａに出力され、電磁弁４ａが開
いて冷却運転が開始する。この間、サーミスタ２ａで庫
内温度を検出し、この検知信号が入出力回路８ａに入力
され、中央処理装置７ａで、設定部６ａで予め設定した
設定値と比較されて設定値よりも低下していれば入出力
回路８ａから電磁弁４ａに出力し、電磁弁４ａを閉じ、
一旦冷却を停止する。その結果、庫内温度が上昇し、設
定値以上になると，今度は入出力回路８ａから電磁弁４
ａに出力し、電磁弁４ａが開いて冷却運転が再開する。
このようにサーミスタ２ａで検出される庫内温度と設定
部６ａで設定した温度とが中央処理装置７ａで比較され
、その結果により、入出力回路８ａからの出力で電磁弁
４ａを開閉し、これを繰返して冷却運転が行われる。
この間、冷蔵ショーケースは湿気を含んだ外気が冷却器
に吸込まれるため、冷却運転の進行にしたがい、冷却器
に着霜し、着霜量が増加する。Next, the operation will be explained. First, to explain how to adjust the temperature inside the refrigerator for the refrigerated showcase 1a, when the power is turned on, the central processing unit 7a outputs the output from the input/output circuit 8a to the solenoid valve 4a, and the solenoid valve 4a opens to start the cooling operation. starts. During this time, the temperature inside the refrigerator is detected by the thermistor 2a, this detection signal is input to the input/output circuit 8a, and the central processing unit 7a compares it with the preset value set in the setting section 6a to determine if the temperature has decreased below the set value. If so, output from the input/output circuit 8a to the solenoid valve 4a, close the solenoid valve 4a,
Temporarily stop cooling. As a result, when the temperature inside the refrigerator rises and exceeds the set value, the input/output circuit 8a sends the solenoid valve 4
a, the solenoid valve 4a opens, and the cooling operation resumes. In this way, the internal temperature detected by the thermistor 2a and the temperature set by the setting part 6a are compared in the central processing unit 7a, and based on the result, the solenoid valve 4a is opened or closed by the output from the input/output circuit 8a. Cooling operation is performed repeatedly. During this time, the outside air containing moisture is sucked into the cooler in the refrigerated showcase, so as the cooling operation progresses, frost forms on the cooler and the amount of frost increases.
【００１４】一方、パルス信号発信器では、全ての冷蔵
ショーケース１ａ，１ｂ〜１ｎの除霜サイクルに基いて
除霜開始及び終了のパルス信号を信号線９を介して全て
の冷蔵ショーケース１ａ，１ｂ〜１ｎの送受信回路５ａ
，５ｂ〜５ｎに常時発信している。そこで、当該冷蔵シ
ョーケース１ａでは、送受信回路５ａに入力されたパル
ス信号を変換して中央処理装置７ａに出力し、中央処理
装置７ａでは入力した信号のアドレス番号を判別して設
定部６ａで予め設定した当該ショーケースのアドレス番
号と比較し、入力した信号が当該ショーケースに対する
ものであれば、信号の内容をさらに判別して、除霜開始
の信号であれば、中央処理装置７ａから入出力回路８ａ
へ出力し、ここからの出力で電磁弁４ａが閉じ、オフサ
イクルによる除霜運転が開始する。除霜終了の信号であ
れば入出力回路８ａからの出力で電磁弁４ａが開き、冷
却運転が再開する。On the other hand, the pulse signal transmitter sends pulse signals for starting and ending defrosting to all the refrigerated showcases 1a, 1b to 1n via the signal line 9 based on the defrosting cycle of all the refrigerated showcases 1a, 1b to 1n. 1b to 1n transmitter/receiver circuit 5a
, 5b to 5n. Therefore, in the refrigerated showcase 1a, the pulse signal input to the transmitting/receiving circuit 5a is converted and outputted to the central processing unit 7a, and the central processing unit 7a determines the address number of the input signal and presets it in the setting section 6a. It is compared with the set address number of the relevant showcase, and if the input signal is for the relevant showcase, the content of the signal is further determined, and if it is a signal to start defrosting, the input/output is sent from the central processing unit 7a. circuit 8a
The output from this closes the solenoid valve 4a, and the off-cycle defrosting operation starts. If the signal indicates the end of defrosting, the solenoid valve 4a is opened by the output from the input/output circuit 8a, and the cooling operation is restarted.
【００１５】他の冷蔵ショーケース１ａ〜１ｎも前記冷
蔵ショーケース１ａと同様に送受信回路５ａ〜５ｎに入
力されるパルス信号が当該ショーケース１ｂ〜１ｎに対
するものであるか否か中央処理装置７ａ〜７ｎで判断し
、当該ショーケース１ｂ〜１ｎに対するものであれば信
号の内容にしたがい除霜を開始、または終了する。Similar to the refrigerated showcase 1a, the other refrigerated showcases 1a to 1n also check whether the pulse signals inputted to the transmitting/receiving circuits 5a to 5n are for the showcases 1b to 1n, or not, to the central processing units 7a to 1n, respectively. 7n, and if it is for the relevant showcases 1b to 1n, defrosting is started or ended according to the content of the signal.
【００１６】[0016]
【発明の効果】以上述べたように本発明の冷蔵ショーケ
ースの温調・除霜方法は、庫内温度や除霜サイクルが異
なる複数の冷蔵ショーケースを設置する場合、除霜につ
いては各冷蔵ショーケース毎に独立の除霜回路を設けず
にすみタイマも不要としたので、配線工事が簡略化でき
、温調も除霜と同じ制御装置で制御でき、構造が簡単な
ものである。Effects of the Invention As described above, the temperature control/defrosting method for refrigerated showcases of the present invention is effective when installing multiple refrigerated showcases with different internal temperatures and defrosting cycles. Since there is no need to provide an independent defrosting circuit for each showcase and there is no need for a timer, wiring work can be simplified, temperature control can be controlled by the same control device as defrosting, and the structure is simple.
【図１】本発明の冷蔵ショーケースの温調・除霜方法の
実施例を示す回路図である。FIG. 1 is a circuit diagram showing an embodiment of the temperature control/defrosting method for a refrigerated showcase according to the present invention.
【図２】従来の温調・除霜方法を示す回路図である。FIG. 2 is a circuit diagram showing a conventional temperature control/defrosting method.
１ａ，１ｂ〜１ｎ…冷蔵ショーケース
２ａ，２ｂ〜２ｎ…サーミスタ
３ａ，３ｂ〜３ｎ…制御装置
４ａ，４ｂ〜４ｎ…電磁弁
５ａ，５ｂ〜５ｎ…送受信回路
６ａ，６ｂ〜６ｎ…設定部
７ａ，７ｂ〜７ｎ…中央処理装置
８ａ，８ｂ〜８ｎ…入出力回路
９…信号線
１０ａ，１０ｂ〜１０ｎ…温度調整装置１１ａ，１１ｂ
〜１１ｎ…タイマ1a, 1b to 1n... Refrigerated showcases 2a, 2b to 2n... Thermistors 3a, 3b to 3n... Control devices 4a, 4b to 4n... Solenoid valves 5a, 5b to 5n... Transmission/reception circuits 6a, 6b to 6n... Setting section 7a, 7b to 7n... Central processing unit 8a, 8b to 8n... Input/output circuit 9... Signal line 10a, 10b to 10n... Temperature adjustment device 11a, 11b
~11n…Timer
Claims (1)
庫内温度検知器と制御装置とを設け、庫内温度検知器か
ら制御装置への出力信号に基いて制御装置で各冷蔵ショ
ーケース毎にその庫内温度を調整し、また、複数の冷蔵
ショーケースに対して共用のパルス信号発信器を設け、
ここから各制御装置へ出力される除霜開始または終了の
パルス信号が当該冷蔵ショーケースに対するものである
場合に、当該冷蔵ショーケースの冷媒回路に設けた電磁
弁を閉じまたは開くことを特徴とした冷蔵ショーケース
の温調・除霜方法。Claim 1: Each of a plurality of refrigerated showcases is provided with an internal temperature sensor and a control device, and the control device controls the temperature of each refrigerated showcase based on an output signal from the internal temperature sensor to the control device. Adjusts the temperature inside the refrigerator, and provides a shared pulse signal transmitter for multiple refrigerated showcases.
When the pulse signal for starting or ending defrosting outputted from here to each control device is for the refrigerated showcase concerned, the solenoid valve provided in the refrigerant circuit of the refrigerated showcase concerned is closed or opened. Temperature control and defrosting methods for refrigerated showcases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6001191A JPH04295577A (en) | 1991-03-25 | 1991-03-25 | Method of temperature-controlling and defrosting for refrigerating showcase |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6001191A JPH04295577A (en) | 1991-03-25 | 1991-03-25 | Method of temperature-controlling and defrosting for refrigerating showcase |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04295577A true JPH04295577A (en) | 1992-10-20 |
Family
ID=13129706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6001191A Pending JPH04295577A (en) | 1991-03-25 | 1991-03-25 | Method of temperature-controlling and defrosting for refrigerating showcase |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04295577A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004101003A (en) * | 2002-09-06 | 2004-04-02 | Daikin Ind Ltd | Defrosting controller and facility equipment monitoring system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4886447A (en) * | 1972-02-16 | 1973-11-15 | ||
| JPS5618935A (en) * | 1979-07-25 | 1981-02-23 | Sumitomo Chem Co Ltd | Novel bicyclo-octane derivative and its preparation |
| JPS5812975A (en) * | 1981-04-09 | 1983-01-25 | パラゴン、エレクトリック、リミテッド | Defrostation controller for one or plural refrigerator to which defroster is combined |
| JPH01291085A (en) * | 1988-02-09 | 1989-11-22 | Fuji Electric Co Ltd | Centralized controller for showcase |
-
1991
- 1991-03-25 JP JP6001191A patent/JPH04295577A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4886447A (en) * | 1972-02-16 | 1973-11-15 | ||
| JPS5618935A (en) * | 1979-07-25 | 1981-02-23 | Sumitomo Chem Co Ltd | Novel bicyclo-octane derivative and its preparation |
| JPS5812975A (en) * | 1981-04-09 | 1983-01-25 | パラゴン、エレクトリック、リミテッド | Defrostation controller for one or plural refrigerator to which defroster is combined |
| JPH01291085A (en) * | 1988-02-09 | 1989-11-22 | Fuji Electric Co Ltd | Centralized controller for showcase |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004101003A (en) * | 2002-09-06 | 2004-04-02 | Daikin Ind Ltd | Defrosting controller and facility equipment monitoring system |
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