JPH02106683A - Defrosting control device for open show case - Google Patents

Defrosting control device for open show case

Info

Publication number
JPH02106683A
JPH02106683A JP25889288A JP25889288A JPH02106683A JP H02106683 A JPH02106683 A JP H02106683A JP 25889288 A JP25889288 A JP 25889288A JP 25889288 A JP25889288 A JP 25889288A JP H02106683 A JPH02106683 A JP H02106683A
Authority
JP
Japan
Prior art keywords
defrosting
open
relay
signal
cooling operation
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
JP25889288A
Other languages
Japanese (ja)
Other versions
JPH0674940B2 (en
Inventor
Masaya Kurita
栗田 正哉
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.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric Co Ltd
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 Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP25889288A priority Critical patent/JPH0674940B2/en
Publication of JPH02106683A publication Critical patent/JPH02106683A/en
Publication of JPH0674940B2 publication Critical patent/JPH0674940B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Freezers Or Refrigerated Showcases (AREA)
  • Defrosting Systems (AREA)

Abstract

PURPOSE:To prevent mixture of cold air and warm air between adjoining chambers by a method wherein when even one signal by means of which a state under defrosting is shown is inputted, a signal by means of which the starting of cooling operation is suspended is outputted to all open cases. CONSTITUTION:Since, during defrosting operation, a relay XD is energized and an (a) contact XD thereof is turned ON, a signal therefrom is outputted from a signal circuit 6 to a control panel to short-circuit a terminal 8. When the terminal 8 is short-circuited, a relay XB of a relay circuit 7 is energized, a (b) contact XB is turned OFF to open a solenoid valve, and cooling operation is rendered ineffective. Signal circuits 6 of open show cases are connected in parallel to the terminal 8. Thus, when even any one set is under defrosting operation, the short-circuit state of the terminal 8 is maintained. In which case, a voltage is applied on all the relay circuits 7 through the terminal 9, the relay XB is energized and cooling operation is blocked. Namely, the re-starting of cooling operation of even the open show case defrosting of which is completed is suspended until defrosting of other open show case is completed.

Description

【発明の詳細な説明】[Detailed description of the invention] 【産業上の利用分野】[Industrial application field]

この発明は、商品を冷蔵して展示するオープンショーケ
ースにおいて、冷却器に付着した霜を除去するための除
霜制御装置に関し、更に詳しくは複数台のオープンショ
ーケースを一系統として、除霜運転を同期して行わせる
オープンショーケースの除霜制御装置に関する。
The present invention relates to a defrosting control device for removing frost adhering to a cooler in an open showcase in which products are refrigerated and displayed. The present invention relates to a defrosting control device for an open showcase that performs synchronous defrosting.

【従来の技術】[Conventional technology]

従来の除霜制御回路を第4図に示す。図は8台のオープ
ンショーケースを一系統とし、これらのオープンショー
ケースを1台の冷凍機に共通に接続した例を示している
。そして、第4図(A)はオープンショーケースごとに
それぞれ搭載される制御回路の1台分(図は第1オープ
ンシヨーケースのもの)を示し、第4図(B)は8台の
オープンショーケースに共通の制御盤に納められる制御
回路を示す。すなわち、第4図(A)の各制御回路は第
4図(B)の制御回路に並列に接続されるものである。 まず、第4図(A)において、■は図示しない冷却器に
付着した霜を溶かす除霜ヒータ、2はオープンショーケ
ース内を循環する冷気の温度を検知して0N−OFF動
作する温′度調節用のサーモスタット(以下、温調サー
モという。)、3は冷凍機とオープンショーケースの冷
却器とを結ぶ冷媒配管に挿入された電磁弁、4は除霜ヒ
ータ1で加熱された冷却器の温度から除霜終了を検知し
てONする除霜サーモスタット(以下、デフサーモとい
う。)、xoは除霜ヒータ1に通電するためのヒータ用
リレー Xl1lはそのC接点、Xは補助リレー Xl
及びX、はそれぞれそ補助リレーXのC接点及びb接点
、XT+はタイマリレーXTIのC接点で、これらはA
C200Vの電源に図示の通り接続されている。 次に、第4図(B)において、5は各オープンショーケ
ースに除霜開始信号を出力する24時間タイマで、例え
ば第3図に示すように、0時、4時及び8時の1日に3
回、各30分ずつ接点TをONさせる。接点TがONす
ると、各オープンショーケースに対して設けられたタイ
マリレーXTI・・・x’rsが一斉に付勢され、これ
らの各C接点(第1のオープンショーケースについては
Xt+)が同時に切り替わる。 このような従来構成の動作を簡単に説明すると次の通り
である。第4図(A)は通常の冷却運転状態を示し、温
調サーモ2は所定の上・下限温度内で0N−OFF動作
している。温調サーモ2がONしているときは電磁弁3
が開いて冷却器に冷媒が供給され、オープンショーケー
ス内が冷却される。また、’tK 8MサーモがOFF
すれば上記冷媒が断たれ冷却が中断される。そこで、第
3図に示すタイムスケジュールによってタイマ5がON
動作すると、第4図(A)のタイマリレー接点Xア。 が切り替わりリレーx0が付勢される。これによりa接
点X、がONL、て除霜ヒータ1に通電される。除霜が
進行し冷却器の温度が上昇するとデフサーモ4がONL
、補助リレーXが付勢される。 これにより、b接点XbがOFFしてリレーX。 が消勢され、接点X。がOFFして除霜ヒータ1に対す
る通電が断たれる。同時にa接点xaがONしてリレー
Xが自己保持されるとともに、電磁弁3が開き冷却運転
が再開される。
A conventional defrosting control circuit is shown in FIG. The figure shows an example in which eight open showcases are connected to one system, and these open showcases are commonly connected to one refrigerator. Figure 4 (A) shows the control circuit for one car installed in each open showcase (the figure is for the first open show case), and Figure 4 (B) shows the control circuit for 8 open showcases. The control circuit housed in the common control panel in the case is shown. That is, each control circuit in FIG. 4(A) is connected in parallel to the control circuit in FIG. 4(B). First, in Fig. 4 (A), ■ is a defrosting heater that melts the frost attached to the cooler (not shown), and 2 is a temperature that detects the temperature of the cold air circulating inside the open showcase and turns it on and off. Thermostat for adjustment (hereinafter referred to as temperature control thermostat), 3 is a solenoid valve inserted in the refrigerant pipe connecting the refrigerator and the cooler of the open showcase, 4 is the solenoid valve of the cooler heated by the defrosting heater 1. A defrost thermostat (hereinafter referred to as a defrost thermostat) that detects the end of defrosting from the temperature and turns on, xo is a heater relay for energizing the defrost heater 1, Xl1l is its C contact,
and X are the C contact and B contact of the auxiliary relay
It is connected to a C200V power supply as shown. Next, in FIG. 4(B), numeral 5 is a 24-hour timer that outputs a defrosting start signal to each open showcase.For example, as shown in FIG. to 3
Turn on contact T for 30 minutes each time. When contact T turns ON, the timer relays XTI...x'rs provided for each open showcase are energized all at once, and each of these C contacts (Xt+ for the first open showcase) Switch. The operation of such a conventional configuration will be briefly explained as follows. FIG. 4(A) shows a normal cooling operation state, in which the temperature control thermostat 2 is operating ON-OFF within predetermined upper and lower temperature limits. When temperature control thermostat 2 is ON, solenoid valve 3
is opened, refrigerant is supplied to the cooler, and the inside of the open showcase is cooled. Also, 'tK 8M thermo is OFF.
Then, the refrigerant is cut off and cooling is interrupted. Therefore, timer 5 is turned on according to the time schedule shown in Figure 3.
When activated, the timer relay contact Xa in FIG. 4(A). is switched and relay x0 is energized. As a result, the a contact X is ONL, and the defrosting heater 1 is energized. As defrosting progresses and the temperature of the cooler rises, the differential thermometer 4 turns ON.
, auxiliary relay X is energized. This turns b contact Xb OFF and relay X. is deenergized, contact point X. is turned off, and power to the defrosting heater 1 is cut off. At the same time, the a contact xa is turned on and the relay X is self-held, and the solenoid valve 3 is opened and the cooling operation is restarted.

【発明が解決しようとする課題】[Problem to be solved by the invention]

上に述べたように、従来装置においては除霜開始時刻が
同期し、同一系統の複数台のオープンショーケースはす
べて同一時刻に除霜が始まるようになっている。しかし
ながら、除霜を終了する時刻については各オープンショ
ーケースのデフサーモ4にまかされているため、各オー
プンショーケースごとにばらばらになっている。 一方、同一系統のオープンショーケースは互いに連結し
て配列され、その場合、隣接するオープンショーケース
間には仕切りがないのが普通である。したがって、除霜
終了時刻、つまり冷却運転再開時刻が従来のようにばら
ばらで、隣接するオープンショーケースの一方が除霜運
転中、他方が冷却運転中という事態が生じると、除霜運
転中のオープンショーケースは冷気が侵入して除霜が妨
げられ、冷却運転中のオープンショーケースは暖気が侵
入して庫内の温度が上がり、商品が劣化するという問題
があった。 そこで、この発明は、除霜開始のみならず冷却運転の再
開も同期させるようにして上記不具合をなくしたオープ
ンショーケースの除霜制御装置を提供することを目的と
するものである。
As described above, in the conventional device, the defrosting start times are synchronized, and defrosting of multiple open showcases in the same system all starts at the same time. However, the time at which defrosting ends is determined by the differential thermostat 4 of each open showcase, so the time differs for each open showcase. On the other hand, open showcases of the same system are arranged in a connected manner, and in this case, there is usually no partition between adjacent open showcases. Therefore, if the defrosting end time, that is, the cooling operation restart time is different as in the past, and one of the adjacent open showcases is in defrosting operation and the other is in cooling operation, if an open showcase during defrosting operation There was a problem that cool air entered the showcases, preventing defrosting, and warm air entered the open showcases during cooling operation, raising the temperature inside the store and causing the products to deteriorate. SUMMARY OF THE INVENTION An object of the present invention is to provide a defrosting control device for an open showcase that eliminates the above-mentioned problems by synchronizing not only the start of defrosting but also the restart of cooling operation.

【課題を解決するための手段】[Means to solve the problem]

上記目的を達成するために、この発明は、複数台のオー
プンショーケースに対して除霜開始信号を同時に出力す
るタイマを備えたオープンショーケースの除霜制御装置
において、除霜運転中はその旨の信号を出力する手段を
各オープンショーケースにそれぞれ設けるとともに、除
霜中を示す前記信号が一つでも入力されているときは冷
却運転の開始を保留させる信号をすべての前記オープン
ショーケースに対して出力する手段を設けるものである
In order to achieve the above object, the present invention provides a defrosting control device for open showcases equipped with a timer that simultaneously outputs a defrosting start signal to a plurality of open showcases. Each open showcase is provided with a means for outputting a signal, and a signal is sent to all open showcases to suspend the start of the cooling operation when even one of the signals indicating that defrosting is in progress is input. A means for outputting the information is provided.

【作 用】[For use]

オープンショーケース側からの除霜生信号により、すべ
てのオープンショーケースの冷却運転再開を保留させ、
前記除霜生信号がなくなったら初めてこれを解除するこ
とにより冷却運転の再開を同期させる。
In response to the defrosting raw signal from the open showcase side, the resumption of cooling operation of all open showcases is suspended.
The resumption of the cooling operation is synchronized by canceling the defrosting raw signal only when it disappears.

【実施例】【Example】

以下、第1図及び第2図に基づいてこの発明の詳細な説
明する。なお、従来例と同一部分には同−の符号を付は
説明を省略する。 さて、実施例の場合も1台の冷凍機に8台のオープンシ
ョーケースが接続されて一系統が構成されているものと
する。各オープンショーケースに搭載される制御回路を
示す第1図(A)において、除霜運転中はその旨の信号
を出力する手段として、ヒータ用リレーXDのa接点X
、が挿入された信号回路6が設けられ、更にリレーXl
lを持つリレー回路7が設けられている。リレーX3の
b接点X、は、電磁弁3と電源とを結ぶ回路に補助リレ
ーXのa接点X、と直列に挿入されている。 一方、制御盤に納められる第1図(B)の制御回路の電
源間には、信号回路6が接続される端子8、リレー回路
7が接続される端子9及び手動スイッチ10からなる直
列回路11が接続されている。端子8及び9には、各オ
ープンショーケースの信号回路6及びリレー回路7がそ
れぞれ並列に接続される。ここで、b接点X、を含むリ
レー回路7及び直列回路11は、オープンショーケース
から除霜中を示す信号が一つでも人力されていたら冷却
運転の開始を保留させる信号をすべてのオープンショー
ケースに対して出力する手段を構成している。 このような構成において、この発明の制御を行わせるた
めにはスイッチlOはONさせておく。 いま、例えば第3図のタイムスケジュールによりタイマ
5がON動作すると、タイマリレーXT+・・・X□を
介してすべてのオープンショーケースの一斉に除霜開始
信号が送られ、すでに述べたように各オープンショーケ
ースで除霜運転が開始される。 除霜運転中はリレーXDが付勢され、そのa接点x0が
ONL、ているので、この信号は信号回路6から制御盤
に送られ端子8を短絡させる。端子8が短絡すると、リ
レー回路7のリレーχBが付勢され、そのb接点x、が
OFFして電磁弁が開き、冷却運転は行われなくなる。 端子8には各オープンジローケースの信号回路6が並列
に接続されている。したがって、どれか1台でも除霜運
転中であれば端子8の短絡状態は維持される。そして、
その場合には端子9を介してすべてのリレー回路7に電
圧が印加され、リレーX、が付勢されて冷却運転が阻止
される。つまり、除霜が完了したオープンショーケース
も、他のすべてのオープンショーケースの除霜が完了す
るまで冷却運転の再開を保留させられることになる。そ
して、最後の1台が除霜を完了すると、直列回路11は
端子8によって開路され、すべてのオープンショーケー
スが一斉に冷却運転を再開することになる。 第2図はこの様子を示すタイムチャートである。 すなわち、第2図において、除霜ヒータlがOFFする
タイミングは各オープンショーケースについてばらばら
であるが、第8オープンシヨーケースが除霜を完了した
時点で、すべてのオープンショーケースが一斉に冷却運
転に移行している。 なお、もしなんらかの異常でいずれかのデフサーモ4が
ONLないことがあっても、タイマは30分後にOFF
するので冷却運転の再開が妨げられることはない。また
、スイッチlOをOFFすれば、従来と同様に、デフサ
ーモ4がONすれば直ちに冷却運転に移行する動作をさ
せることができる。
Hereinafter, the present invention will be explained in detail based on FIGS. 1 and 2. Note that parts that are the same as those in the conventional example are given the same reference numerals, and explanations thereof will be omitted. In the case of the embodiment as well, it is assumed that eight open showcases are connected to one refrigerator to form one system. In FIG. 1 (A) showing the control circuit installed in each open showcase, during defrosting operation, a contact X of heater relay XD is used as a means to output a signal to that effect.
A signal circuit 6 is provided, in which a relay Xl is inserted.
A relay circuit 7 is provided with l. The b contact X of the relay X3 is inserted in series with the a contact X of the auxiliary relay X in a circuit connecting the solenoid valve 3 and the power source. On the other hand, a series circuit 11 consisting of a terminal 8 to which the signal circuit 6 is connected, a terminal 9 to which the relay circuit 7 is connected, and a manual switch 10 is connected between the power supplies of the control circuit shown in FIG. 1(B) housed in the control panel. is connected. The signal circuit 6 and relay circuit 7 of each open showcase are connected in parallel to the terminals 8 and 9, respectively. Here, the relay circuit 7 and the series circuit 11 including the b contact It constitutes a means for outputting to. In such a configuration, the switch 10 is turned on in order to perform the control of the present invention. Now, for example, when timer 5 turns on according to the time schedule shown in Figure 3, a defrosting start signal is sent to all open showcases simultaneously via timer relays XT+... Defrosting operation begins in the open showcase. During defrosting operation, relay XD is energized and its a contact x0 is ONL, so this signal is sent from signal circuit 6 to the control panel and short-circuits terminal 8. When the terminal 8 is short-circuited, the relay χB of the relay circuit 7 is energized, its b contact x is turned off, the solenoid valve is opened, and the cooling operation is no longer performed. The signal circuits 6 of each open zipper case are connected to the terminal 8 in parallel. Therefore, if any one of the devices is in defrosting operation, the short-circuited state of the terminal 8 is maintained. and,
In that case, voltage is applied to all relay circuits 7 via terminals 9, relays X are energized, and cooling operation is blocked. In other words, restart of the cooling operation of the open showcase that has been defrosted is also suspended until the defrosting of all other open showcases is completed. When the last one completes defrosting, the series circuit 11 is opened by the terminal 8, and all the open showcases resume cooling operation at once. FIG. 2 is a time chart showing this situation. In other words, in Fig. 2, the timing at which the defrosting heater l is turned off is different for each open showcase, but when the eighth open showcase completes defrosting, all the open showcases start cooling operation at the same time. is moving to. In addition, even if any of the differential thermos 4 is not ONL due to some abnormality, the timer will turn off after 30 minutes.
Therefore, resumption of cooling operation is not prevented. Further, if the switch 10 is turned off, the cooling operation can be immediately started when the differential thermostat 4 is turned on, as in the conventional case.

【発明の効果】【Effect of the invention】

この発明によれば、除霜開始のみならず冷却運転の開始
も同期させることができるので、隣接するオープンショ
ーケース同志で冷気と暖気入り乱れて除霜が妨げられた
り、商品が劣化したりすることを防止することができる
According to this invention, not only the start of defrosting but also the start of cooling operation can be synchronized, which prevents cold air and warm air from flowing into adjacent open showcases, hindering defrosting or causing product deterioration. can be prevented.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図(A)はこの発明の実施例におけるオープンショ
ーケース側の制御回路の回路図、第1図(B)は同じく
制御盤側の制御回路の回路図、第2図はこの発明の実施
例における運転状況を示すタイムチャート、第3図はタ
イマの除霜スケジュールを示すタイムチャート、第4図
(A)は従来例におけるオープンショーケース側の制御
回路の回路図、第4図(B)は同じく制御盤側の制御回
路の回路図である。 ■・・・除霜ヒータ、2・・・温調サーモ、3・・・電
磁弁、4・・・デフサーモ、5・・・タイマ。 AC200V OoO ↓ 弔 図
FIG. 1(A) is a circuit diagram of the control circuit on the open showcase side in an embodiment of the present invention, FIG. 1(B) is a circuit diagram of the control circuit on the control panel side, and FIG. 2 is a circuit diagram of the control circuit on the control panel side in the embodiment of the present invention. Fig. 3 is a time chart showing the defrosting schedule of the timer, Fig. 4 (A) is a circuit diagram of the control circuit on the open showcase side in the conventional example, Fig. 4 (B) is also a circuit diagram of the control circuit on the control panel side. ■... Defrost heater, 2... Temperature control thermo, 3... Solenoid valve, 4... Defrost thermo, 5... Timer. AC200V OoO ↓ Funeral map

Claims (1)

【特許請求の範囲】[Claims] 1)複数台のオープンショーケースに対して除霜開始信
号を同時に出力するタイマを備えたオープンショーケー
スの除霜制御装置において、除霜運転中はその旨の信号
を出力する手段を各オープンショーケースにそれぞれ設
けるとともに、除霜中を示す前記信号が一つでも入力さ
れているときは冷却運転の開始を保留させる信号をすべ
ての前記オープンショーケースに対して出力する手段を
共通に設けたことを特徴とするオープンショーケースの
除霜制御装置。
1) In an open showcase defrosting control device equipped with a timer that simultaneously outputs a defrost start signal to multiple open showcases, each open showcase is equipped with means for outputting a signal to that effect during defrosting operation. In addition to being provided in each case, a means for outputting a signal for suspending the start of the cooling operation when even one of the signals indicating that defrosting is being input is provided in common to all the open showcases. An open showcase defrost control device featuring:
JP25889288A 1988-10-14 1988-10-14 Defrost control device for open showcase Expired - Lifetime JPH0674940B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25889288A JPH0674940B2 (en) 1988-10-14 1988-10-14 Defrost control device for open showcase

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25889288A JPH0674940B2 (en) 1988-10-14 1988-10-14 Defrost control device for open showcase

Publications (2)

Publication Number Publication Date
JPH02106683A true JPH02106683A (en) 1990-04-18
JPH0674940B2 JPH0674940B2 (en) 1994-09-21

Family

ID=17326479

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25889288A Expired - Lifetime JPH0674940B2 (en) 1988-10-14 1988-10-14 Defrost control device for open showcase

Country Status (1)

Country Link
JP (1) JPH0674940B2 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0493579A (en) * 1990-08-09 1992-03-26 Fuji Electric Co Ltd Defrosting control device for open show case
JPH07180946A (en) * 1994-02-03 1995-07-18 Fuji Electric Co Ltd Defreosting controller for open showcase
JPH07180945A (en) * 1994-02-03 1995-07-18 Fuji Electric Co Ltd Defrosting controller for open showcase
JPH07180947A (en) * 1994-02-03 1995-07-18 Fuji Electric Co Ltd Defrosting controller for open showcase
JP2008025868A (en) * 2006-07-18 2008-02-07 Toshiba Kyaria Kk Refrigerating device
JP2008267717A (en) * 2007-04-23 2008-11-06 Matsushita Electric Ind Co Ltd Cooker
CN111365930A (en) * 2020-03-23 2020-07-03 海信(山东)冰箱有限公司 Refrigerator and defrosting method thereof

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0493579A (en) * 1990-08-09 1992-03-26 Fuji Electric Co Ltd Defrosting control device for open show case
JPH07180946A (en) * 1994-02-03 1995-07-18 Fuji Electric Co Ltd Defreosting controller for open showcase
JPH07180945A (en) * 1994-02-03 1995-07-18 Fuji Electric Co Ltd Defrosting controller for open showcase
JPH07180947A (en) * 1994-02-03 1995-07-18 Fuji Electric Co Ltd Defrosting controller for open showcase
JP2008025868A (en) * 2006-07-18 2008-02-07 Toshiba Kyaria Kk Refrigerating device
JP2008267717A (en) * 2007-04-23 2008-11-06 Matsushita Electric Ind Co Ltd Cooker
CN111365930A (en) * 2020-03-23 2020-07-03 海信(山东)冰箱有限公司 Refrigerator and defrosting method thereof

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