JP3013296B2 - Multiple showcase cooling system - Google Patents
Multiple showcase cooling systemInfo
- Publication number
- JP3013296B2 JP3013296B2 JP8356053A JP35605396A JP3013296B2 JP 3013296 B2 JP3013296 B2 JP 3013296B2 JP 8356053 A JP8356053 A JP 8356053A JP 35605396 A JP35605396 A JP 35605396A JP 3013296 B2 JP3013296 B2 JP 3013296B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- refrigerant
- defrosting
- showcase
- pipe
- 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.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/22—Refrigeration systems for supermarkets
Landscapes
- Freezers Or Refrigerated Showcases (AREA)
- Defrosting Systems (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は１基の冷凍機により
複数のショーケースを冷却するための装置に関する。The present invention relates to an apparatus for cooling a plurality of showcases with one refrigerator.
【０００２】[0002]
【従来の技術とその問題点】１基の冷凍機により複数の
ショーケースを冷却する冷却装置においては、ショーケ
ースの大きさや設定温度、あるいは陳列商品の種類や出
し入れの頻度等の諸条件によりショーケースごとに冷却
コイルへの着霜量が異なる。2. Description of the Related Art In a cooling device that cools a plurality of showcases with a single refrigerator, the number of showcases depends on various conditions such as the size and set temperature of the showcase, the type of displayed products, and the frequency of taking in and out. The amount of frost on the cooling coil differs for each case.
【０００３】全てのショーケースに対して同じ除霜運転
を行うと、一部のショーケースに除霜不良や温度上昇等
が生じるという問題があり、またショーケースごとに着
霜量に見合う時間の除霜を行うには配管や制御が複雑に
なるという問題もあった。[0003] If the same defrosting operation is performed for all showcases, there is a problem that some of the showcases may have poor defrosting or a rise in temperature. There is also a problem that piping and control become complicated to perform defrosting.
【０００４】[0004]
【目的】本発明の目的はショーケースごとに必要かつ十
分な除霜を行うことができ、しかも構造が簡単な複数シ
ョーケースの冷却装置を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a cooling device for a plurality of showcases, which can perform necessary and sufficient defrosting for each showcase and has a simple structure.
【０００５】[0005]
【手段】上記目的を達成するために、本発明に係る複数
ショーケースの冷却装置は圧縮機、凝縮器および受液器
を備える冷凍機の前記受液器の液冷媒出口に一端を接続
した冷媒往管の他端と、前記圧縮機の吸入側に一端を接
続した冷媒復管の他端との間に、それぞれ冷媒入口から
同出口に至る冷媒管に膨張弁と冷却コイルを設けた複数
のショーケースを並列に接続し、前記冷媒往管に、冷却
運転時は開かれているが除霜運転開始時に閉成され、前
記複数のショーケースのうちいずれかのショーケースに
おける冷却コイルの除霜が終了すると開成される主液弁
を設けるとともに、前記受液器に、この受液器の気相に
臨むガス冷媒出口を設けて同出口に一端を接続した送ガ
ス管の他端を前記冷媒往管における主液弁の下流側に接
続し、この送ガス管に、冷却運転時は閉ざされているが
除霜運転開始時に開成され、前記複数のショーケースの
うちいずれかのショーケースにおける冷却コイルの除霜
が終了すると閉成される主ガス弁を設け、また前記各シ
ョーケースの膨張弁よりも上流側の冷媒管に、冷却運転
時はショーケース内の温度に応じて適宜開閉されるが除
霜運転開始時に閉成され、ショーケース内における冷却
コイルの除霜が終了すると開成されるメイン弁を設ける
とともに、このメイン弁よりも上流側に一端を接続した
バイパス管の他端を冷却コイルの入口に接続してこのバ
イパス管に、冷却運転時は閉ざされているが除霜運転開
始時に開成され、ショーケース内における冷却コイルの
除霜が終了すると閉成されるバイパス弁を設け、さら
に、タイマーにより予め設定された時刻になるとデフロ
スト開始指令を前記冷凍機および各ショーケースに発
し、また各ショーケースの除霜が終了して冷却コイルの
出口配管温度が所定の温度に達すると冷凍機および除霜
が終了したショーケースにデフロスト復帰指令を発する
制御装置を備え、制御装置からデフロスト開始指令が発
せられると冷凍機における前記主液弁および各ショーケ
ースの前記メイン弁が閉成されるとともに、冷凍機の主
ガス弁および各ショーケースのバイパス弁が開成されて
全てのショーケースの冷却コイルに受液器からのガス冷
媒が供給されてガス冷媒の潜熱による除霜が行われ、ま
た、デフロスト復帰指令が発せられると冷凍機の主液弁
が開成されるとともに主ガス弁が閉成されて冷凍機から
全てのショーケースに液冷媒が供給され、除霜が終了し
ていないショーケースにおいてはメイン弁が閉、バイパ
ス弁が開のままで冷却コイルに前記バイパス管から液冷
媒が供給されてこの液冷媒の顕熱による除霜が行われ、
除霜が終了したショーケースにおいてはメイン弁が開成
されるとともにバイパス弁が閉成されて冷却運転が行わ
れることを特徴としている。To achieve the above object, a cooling device for a plurality of showcases according to the present invention comprises a refrigerant having one end connected to a liquid refrigerant outlet of the receiver of a refrigerator having a compressor, a condenser and a receiver. Between the other end of the outgoing pipe and the other end of the refrigerant return pipe having one end connected to the suction side of the compressor, a plurality of refrigerant pipes each having an expansion valve and a cooling coil provided in a refrigerant pipe extending from the refrigerant inlet to the same outlet. The showcases are connected in parallel, and the refrigerant outward pipe is opened during the cooling operation but closed at the start of the defrosting operation, and the defrosting of the cooling coil in any one of the plurality of showcases is performed. The main liquid valve which is opened when the operation is completed is provided, and the liquid receiver is provided with a gas refrigerant outlet facing the gas phase of the liquid receiver, and the other end of the gas sending pipe having one end connected to the outlet is provided with the refrigerant. Connect to the downstream side of the main liquid valve in the A main gas valve that is closed during the cooling operation but is opened at the start of the defrosting operation and is closed when the defrosting of the cooling coil in one of the plurality of showcases is completed, In addition, the refrigerant pipe upstream of the expansion valve of each showcase is appropriately opened and closed according to the temperature in the showcase during the cooling operation, but is closed at the start of the defrosting operation, and the cooling coil in the showcase is opened. A main valve that is opened when defrosting is completed is provided, and the other end of a bypass pipe having one end connected to the upstream side of the main valve is connected to an inlet of a cooling coil, and the bypass pipe is closed during cooling operation. A bypass valve that is opened at the start of the defrosting operation and closed when the defrosting of the cooling coil in the showcase is completed, and when a timer is set in advance. When it becomes, the defrost start command is issued to the refrigerator and each showcase, and when the defrosting of each showcase is completed and the outlet pipe temperature of the cooling coil reaches a predetermined temperature, the refrigerator and the showcase where the defrosting is completed. A control device that issues a defrost return command is provided, and when a defrost start command is issued from the control device, the main liquid valve in the refrigerator and the main valve of each showcase are closed, and the main gas valve of the refrigerator and Bypass valves of each showcase are opened, gas refrigerant from the receiver is supplied to the cooling coils of all showcases, defrosting is performed by the latent heat of the gas refrigerant, and freezing is performed when a defrost return command is issued. When the main liquid valve of the machine is opened and the main gas valve is closed, liquid refrigerant is supplied from the refrigerator to all showcases, and defrosting is completed. In a showcase where no main valve is closed and the bypass valve is left open, a liquid refrigerant is supplied from the bypass pipe to the cooling coil, and defrosting is performed by sensible heat of the liquid refrigerant.
In a showcase where defrosting has been completed, the main valve is opened and the bypass valve is closed to perform a cooling operation.
【０００６】[0006]
【実施例】以下、本発明に係る冷却装置の実施例を添付
図面に示す具体例に基づいて詳細に説明する。本発明の
冷却装置は１基の冷凍機により複数のショーケースを冷
却するものとしてあって、本実施例では１基の冷凍機に
より２基のショーケースを冷却し、各ショーケースがそ
れぞれ２個の冷却コイルを備えている場合の具体例につ
いて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the cooling device according to the present invention will be described below in detail with reference to specific examples shown in the accompanying drawings. The cooling device of the present invention cools a plurality of showcases with one refrigerator. In the present embodiment, two showcases are cooled with one refrigerator, and two showcases are provided. A specific example when the cooling coil is provided will be described.
【０００７】冷凍機１において、圧縮機２の吐出側は吐
出管３を介して凝縮器４の冷媒入口に接続され、同出口
は流量調整弁５ａを備える冷媒管５により受液器６の冷
媒入口６ａに接続されている。In the refrigerator 1, the discharge side of the compressor 2 is connected to a refrigerant inlet of a condenser 4 via a discharge pipe 3, and the outlet is connected to a refrigerant pipe of a receiver 6 by a refrigerant pipe 5 having a flow control valve 5a. It is connected to the inlet 6a.
【０００８】受液器６内下部の液相に臨む液冷媒出口６
ｂは、主液弁ＭＬを備える冷媒往管７を介して第１およ
び第２のショーケース８、９の各冷媒入口１０、１０に
接続されており、各ショーケースの冷媒出口１１、１１
は冷媒復管１２を介して冷凍機１のアキュムレータ１３
の冷媒入口に接続されていて、同出口は吸入管１４を介
して圧縮機２の吸入側に接続されている。Liquid refrigerant outlet 6 facing the liquid phase in the lower part of liquid receiver 6
b is connected to the respective refrigerant inlets 10 and 10 of the first and second showcases 8 and 9 via the refrigerant outgoing pipe 7 including the main liquid valve ML, and the refrigerant outlets 11 and 11 of the respective showcases.
Is the accumulator 13 of the refrigerator 1 via the refrigerant return pipe 12.
Is connected to the suction side of the compressor 2 via a suction pipe 14.
【０００９】前記主液弁ＭＬは通常は開かれているが除
霜運転開始時に閉成され、いずれかのショーケースにお
ける冷却コイルの除霜が終了すると開成されるものとし
てある。The main liquid valve ML is normally open, but is closed at the start of the defrosting operation, and is opened when the defrosting of the cooling coil in any one of the showcases is completed.
【００１０】前記受液器６にはこの受液器内上部の気相
に臨むガス冷媒出口６ｃを設けてあって、同出口は流量
調整弁１５ａと主ガス弁ＭＧを備える送ガス管１５によ
り前記冷媒往管７の主液弁ＭＬの下流側に接続されてお
り、また送ガス管１５の流量調整弁１５ａと主ガス弁Ｍ
Ｇの間には容量調整弁１６ａを備える分岐管１６の一端
を接続してあって、同分岐管は圧縮機２の吸入管１４の
途中に接続されており、分岐管１６における容量調整弁
１６ａの上流側には同調節弁用の開閉弁ＣＰＶを設けて
ある。The liquid receiver 6 is provided with a gas refrigerant outlet 6c facing the gas phase in the upper part of the liquid receiver. The gas refrigerant outlet 6c is connected by a gas supply pipe 15 provided with a flow control valve 15a and a main gas valve MG. The refrigerant outlet pipe 7 is connected to the downstream side of the main liquid valve ML, and the flow control valve 15a of the gas supply pipe 15 and the main gas valve M
One end of a branch pipe 16 provided with a capacity adjusting valve 16a is connected between G, and the branch pipe is connected in the middle of the suction pipe 14 of the compressor 2, and the capacity adjusting valve 16a in the branch pipe 16 is connected. An on-off valve CPV for the control valve is provided upstream of the control valve.
【００１１】前記主ガス弁ＭＧは通常は閉じているが除
霜運転開始時に開成され、いずれかのショーケースにお
ける冷却コイルの除霜が終了すると閉成されるものとし
てあり、また前記開閉弁ＣＰＶは通常は閉ざされている
が除霜運転開始時に開成され、前記送ガス管１５内のガ
スを容量調整弁１６ａを介して圧縮機２の吸入側へ送
り、凝縮器６内のガス圧を適正に保つようになってお
り、全てのショーケースにおける冷却コイルの除霜が終
了してから所定の時間後、あるいは凝縮器内の圧力が所
定の値になってから閉成されるものとしてある。The main gas valve MG is normally closed, but is opened when the defrosting operation is started, and is closed when the defrosting of the cooling coil in any one of the showcases is completed. Is normally closed, but is opened at the start of the defrosting operation. The gas in the gas feed pipe 15 is sent to the suction side of the compressor 2 via the capacity adjusting valve 16a, and the gas pressure in the condenser 6 is adjusted appropriately. , And is closed after a predetermined time from the completion of the defrosting of the cooling coils in all the showcases or after the pressure in the condenser reaches a predetermined value.
【００１２】第１および第２のショーケース８、９にお
いては、冷媒入口１０からの冷媒管１７が冷却運転時に
のみ開となるメイン弁ＭＶを介してそれぞれ膨張弁１８
ａ、１８ｂを備える枝管１９ａ、１９ｂにより冷却コイ
ルＡ、Ｂの各冷媒入口に接続されている。In the first and second showcases 8 and 9, the refrigerant pipe 17 from the refrigerant inlet 10 is connected to the expansion valve 18 via the main valve MV which is opened only during the cooling operation.
The branch pipes 19a and 19b provided with a and 18b are connected to the respective refrigerant inlets of the cooling coils A and B.
【００１３】各冷却コイルＡ、Ｂの冷媒出口には、それ
ぞれサクション弁ＳＡ、ＳＢを備える枝管２０ａ、２０
ｂの一端が接続されており、両枝管２０ａ、２０ｂの他
端は合流してショーケース８の冷媒出口１１に接続され
ている。[0013] Branch pipes 20a, 20a having suction valves SA, SB are provided at the refrigerant outlets of the cooling coils A, B, respectively.
b is connected to one end, and the other ends of both branch pipes 20a and 20b are joined and connected to the refrigerant outlet 11 of the showcase 8.
【００１４】また、前記冷媒管１７におけるメイン弁Ｍ
Ｖの上流側には、バイパス管２１の一端を接続してあっ
て、このバイパス管２１の他端はそれぞれバイパス弁Ｂ
Ａ、ＢＢを備えるバイパス枝管２１ａ、２１ｂを介して
前記冷却コイルＡ、Ｂの各冷媒入口に接続してある。The main valve M in the refrigerant pipe 17
One end of a bypass pipe 21 is connected to the upstream side of V, and the other end of the bypass pipe 21 is connected to a bypass valve B
The cooling coils A and B are connected to respective refrigerant inlets through bypass branch pipes 21a and 21b having A and BB.
【００１５】さらに、冷却コイルＡ、Ｂの出口側にはそ
れぞれ逆止弁２２ａ、２２ｂを備える戻し枝管２３ａ、
２３ｂの一端を接続してあって、両戻し枝管２３ａ、２
３ｂの他端は戻し管２３で合流して冷媒管１７における
メイン弁ＭＶの下流側に接続してある。Further, return branch pipes 23a having check valves 22a and 22b are provided at the outlet sides of the cooling coils A and B, respectively.
One end of the return branch pipe 23a,
The other end of 3b is joined by the return pipe 23 and connected to the refrigerant pipe 17 downstream of the main valve MV.
【００１６】冷凍機１におけるの主液弁ＭＬ、主ガス弁
ＭＧおよび容量調整弁用開閉弁ＣＰＶ並びにショーケー
ス８、９におけるメイン弁ＭＶ、バイパス弁ＢＡ、ＢＢ
およびサクション弁ＳＡ、ＳＢは電磁開閉弁としてあっ
て、図示省略の制御装置から発せられるデフロスト開始
指令およびデフロスト復帰指令の各制御信号に基づいて
開閉制御される。なお、各制御信号およびこの信号によ
る上記各弁の開閉動作との関係の詳細については後述す
る。The main liquid valve ML, the main gas valve MG and the opening / closing valve CPV for the capacity adjusting valve in the refrigerator 1 and the main valve MV, the bypass valves BA and BB in the showcases 8 and 9.
The suction valves SA and SB are electromagnetic on-off valves, and are controlled to open and close based on control signals of a defrost start command and a defrost return command issued from a control device (not shown). The details of the relationship between each control signal and the opening / closing operation of each valve by this signal will be described later.
【００１７】ショーケース８、９の具体的な構造は例え
ば図２に示すようなものとしてあり、ショーケース本体
２４内には下部、背部、上部の各空気通路２５ａ、２５
ｂ、２５ｃが形成されていて、下部空気通路に設けられ
たファン２６の駆動により吸気口２７から吸入された空
気が冷却コイルＡ、Ｂを経て吹出口２８から吐出され、
商品出入口にエアカーテンを形成して再び吸気口２７に
吸入されて循環するようになっている。The specific structure of the showcases 8 and 9 is, for example, as shown in FIG. 2, and the lower, back and upper air passages 25a and 25 are provided in the showcase body 24.
b, 25c are formed, and the air sucked in from the air inlet 27 by the driving of the fan 26 provided in the lower air passage is discharged from the air outlet 28 through the cooling coils A, B,
An air curtain is formed at the product entrance, and is again sucked into the intake port 27 and circulated.
【００１８】本実施例の冷却装置においては２つの冷却
コイルＡ、Ｂのいずれか一方が除霜中であっても他方の
冷却コイルは冷却運転を続けるので、除霜中の冷却コイ
ルから出る蒸気が冷却中の冷却コイルからの冷気により
凍結して冷却コイル間に氷柱が生じることがあり、その
対策として冷却コイルＡ、Ｂ間の仕切上縁部に例えば電
気ヒータよりなる補助ヒータ２９を設けてあって、冷却
コイル間に氷柱が成長しないようにしてある。なお、図
中の符号３０、３０は商品陳列用の棚を示す。In the cooling apparatus of this embodiment, even if one of the two cooling coils A and B is being defrosted, the other cooling coil continues the cooling operation. May be frozen by the cool air from the cooling coil during cooling to form an icicle between the cooling coils. As a countermeasure, an auxiliary heater 29 such as an electric heater is provided at the upper edge of the partition between the cooling coils A and B. Therefore, icicles are prevented from growing between the cooling coils. Reference numerals 30 and 30 in the drawing indicate shelves for displaying products.
【００１９】次に、上述した構成の冷却装置の作用を説
明する。冷凍機１およびショーケース８、９はそれぞれ
後述する各弁の開閉動作によって運転モードが切り換え
られるようになっており、まず冷凍機の運転モードにつ
いて説明する。Next, the operation of the cooling device having the above configuration will be described. The operation modes of the refrigerator 1 and the showcases 8 and 9 are switched by opening and closing operations of respective valves described later. First, the operation modes of the refrigerator will be described.
【００２０】冷凍機１においては圧縮機２からの高温ガ
ス冷媒が凝縮器４で冷却されて凝縮し、気液混合状態で
受液器６に送られて一旦貯留される。冷凍機１の運転モ
ードは受液器６内の液冷媒を供給する液冷媒供給モード
と、受液器内の非凝縮のガス冷媒たるウォームガスを供
給するウォームガス供給モードがある。In the refrigerator 1, the high-temperature gas refrigerant from the compressor 2 is cooled and condensed by the condenser 4 and sent to the receiver 6 in a gas-liquid mixed state, where it is temporarily stored. The operation modes of the refrigerator 1 include a liquid refrigerant supply mode for supplying liquid refrigerant in the receiver 6 and a warm gas supply mode for supplying worm gas as a non-condensable gas refrigerant in the receiver.
【００２１】＜液冷媒供給モード＞液冷媒供給モードで
は主液弁ＭＬが開、主ガス弁ＭＧが閉となって受液器６
内下部の液冷媒が液冷媒出口６ｂから主液弁ＭＬを介し
て冷媒往管７により両ショーケース８、９へ送られる。<Liquid Refrigerant Supply Mode> In the liquid refrigerant supply mode, the main liquid valve ML is opened, the main gas valve MG is closed, and the receiver 6 is closed.
The inner and lower liquid refrigerant is sent from the liquid refrigerant outlet 6b to the two showcases 8 and 9 via the main liquid valve ML by the refrigerant outward pipe 7.
【００２２】＜ウォームガス供給モード＞ウォームガス
供給モードでは、主液弁ＭＬが閉、主ガス弁ＭＧが開と
なって、受液器６内上部のウォームガスがガス冷媒出口
６ｃから送ガス管１５により主ガス弁ＭＧを経て冷媒往
管７に送られ、この冷媒往管により両ショーケース８、
９へ送られる。両ショーケース８、９を経た冷媒は冷凍
機１の運転モードに関わらず冷媒復管１２からアキュム
レータ１３、吸入管１４を介して圧縮機２へ吸入され
る。<Warm Gas Supply Mode> In the warm gas supply mode, the main liquid valve ML is closed and the main gas valve MG is opened, and the worm gas in the upper part of the receiver 6 is supplied from the gas refrigerant outlet 6c to the gas supply pipe. Through the main gas valve MG, the refrigerant is sent to the refrigerant outgoing pipe 7 through the refrigerant outgoing pipe 15, and the two showcases 8 and
It is sent to 9. The refrigerant that has passed through the two showcases 8 and 9 is drawn into the compressor 2 from the refrigerant return pipe 12 through the accumulator 13 and the suction pipe 14 regardless of the operation mode of the refrigerator 1.
【００２３】次に各ショーケースの冷却コイルＡを除霜
する場合の運転モードにおける冷媒の流れを、図３〜６
に示す構成図に基づいて説明する。これらの図におい
て、冷媒の流れを示す矢印は、実線矢印が高圧液冷媒、
破線矢印が低圧ガス冷媒、二重線矢印がウォームガスの
流れを示す。Next, the flow of the refrigerant in the operation mode when the cooling coil A of each showcase is defrosted will be described with reference to FIGS.
This will be described based on the configuration diagram shown in FIG. In these figures, the arrows indicating the flow of the refrigerant are as follows:
The dashed arrows indicate the flow of the low-pressure gas refrigerant, and the double arrows indicate the flow of the worm gas.
【００２４】＜冷却モード＞冷却モードにおいては冷凍
機１から液冷媒が供給され、この液冷媒が膨張弁１８
ａ、１８ｂを介して両冷却コイルＡ、Ｂへ送られるよう
になっており、ショーケース内のメイン弁ＭＶ、サクシ
ョン弁ＳＡ、ＳＢが開、バイパス弁ＢＡ、ＢＢが閉とさ
れる。<Cooling Mode> In the cooling mode, a liquid refrigerant is supplied from the refrigerator 1 and this liquid refrigerant is supplied to the expansion valve 18.
The cooling valves A and B are sent to the two cooling coils A and B via a and 18b. The main valve MV and the suction valves SA and SB in the showcase are opened, and the bypass valves BA and BB are closed.
【００２５】冷媒入口１０から冷媒管１７に流入した液
冷媒は、図３に示されるようにメイン弁ＭＶを経て枝管
１９ａ、１９ｂによりそれぞれ膨張弁１８ａ、１８ｂを
介して冷却コイルＡ、Ｂに送り込まれ、気化して冷熱を
発生する。As shown in FIG. 3, the liquid refrigerant flowing from the refrigerant inlet 10 into the refrigerant pipe 17 passes through the main valve MV to branch coils 19a, 19b and to the cooling coils A, B via expansion valves 18a, 18b, respectively. Sent and vaporized to generate cold heat.
【００２６】冷却コイルＡ、Ｂからの低圧ガス冷媒はそ
れぞれ枝管２０ａ、２０ｂによりサクション弁ＳＡ、Ｓ
Ｂを経て冷媒出口１１から冷媒復管１２に流れ込み、冷
凍機１へ戻される。なお、メイン弁ＭＶとサクション弁
ＳＡ、ＳＢはショーケース内の温度に応じて例えば調温
用サーモスタットからの信号により適宜開閉制御され
る。The low-pressure gas refrigerant from the cooling coils A and B is supplied to the suction valves SA and S by branch pipes 20a and 20b, respectively.
The refrigerant flows into the refrigerant return pipe 12 from the refrigerant outlet 11 via B, and is returned to the refrigerator 1. The opening and closing of the main valve MV and the suction valves SA and SB are appropriately controlled in accordance with the temperature in the showcase, for example, by a signal from a thermostat for temperature control.
【００２７】＜ウォームガスデフロストモード＞ウォー
ムガスデフロストモードにおいては冷凍機１からウォー
ムガスが供給され、このウォームガスが膨張弁をバイパ
スして片側の冷却コイルに直接送られ、このウォームガ
スの潜熱により除霜が行われるようになっており、冷却
コイルＡを除霜する場合にはバイパス弁ＢＡ、サクショ
ン弁ＳＢが開、メイン弁ＭＶ、バイパス弁ＢＢ、サクシ
ョン弁ＳＡが閉とされる。<Warm Gas Defrost Mode> In the warm gas defrost mode, the worm gas is supplied from the refrigerator 1, and the worm gas is sent directly to the cooling coil on one side by bypassing the expansion valve. When defrosting the cooling coil A, the bypass valve BA and the suction valve SB are opened, and the main valve MV, the bypass valve BB, and the suction valve SA are closed.
【００２８】冷媒入口１０から冷媒管１７に流入したウ
ォームガスは図４に示すようにバイパス管２１を通り、
バイパス枝管２１ａによりバイパス弁ＢＡを経て冷却コ
イルＡに送り込まれる。ウォームガスは冷却コイルＡ内
で凝縮して液冷媒になり、潜熱により冷却コイルに付着
している霜を融かす。The warm gas flowing from the refrigerant inlet 10 into the refrigerant pipe 17 passes through the bypass pipe 21 as shown in FIG.
It is sent to the cooling coil A via the bypass valve BA by the bypass branch pipe 21a. The worm gas is condensed in the cooling coil A to become a liquid refrigerant, and melts the frost attached to the cooling coil by the latent heat.
【００２９】冷却コイルＡからの液冷媒は戻し枝管２３
ａおよび戻し管２３により冷媒管１７におけるメイン弁
ＭＶの下流側に流れ込み、枝管１９ｂにより膨張弁１８
ｂを経て冷却コイルＢに送り込まれて気化し、冷熱を発
生する。冷却コイルＢからのガス冷媒は枝管２０ｂによ
りサクション弁ＳＢを経て冷媒出口１１から冷媒復管１
２に流れ込み、冷凍機１へ戻される。The liquid refrigerant from the cooling coil A is returned to the return branch pipe 23.
a into the refrigerant pipe 17 downstream of the main valve MV through the return pipe 23 and the expansion valve 18 through the branch pipe 19b.
After passing through b, it is sent to the cooling coil B and vaporized to generate cold heat. The gas refrigerant from the cooling coil B passes through the branch valve 20b, passes through the suction valve SB, and flows from the refrigerant outlet 11 to the refrigerant return pipe 1
2 and is returned to the refrigerator 1.
【００３０】＜液デフロストモード＞液デフロストモー
ドは上述したウォームガスデフロストで融かしきれなか
った霜を液冷媒の顕熱により融かすためのモードであ
る。この液デフロストモードにおいては冷凍機１から液
冷媒が供給され、この液冷媒を片側の冷却コイルに送
り、液冷媒の顕熱により除霜を行うようになっており、
冷却コイルＡを除霜する場合には上述したウォームガス
デフロストモードと同じくバイパス弁ＢＡ、サクション
弁ＳＢが開、メイン弁ＭＶ、バイパス弁ＢＢ、サクショ
ン弁ＳＡが閉とされる。<Liquid Defrost Mode> The liquid defrost mode is a mode for melting the frost that could not be melted by the warm gas defrost by the sensible heat of the liquid refrigerant. In the liquid defrost mode, a liquid refrigerant is supplied from the refrigerator 1, and the liquid refrigerant is sent to a cooling coil on one side, and defrosting is performed by sensible heat of the liquid refrigerant.
When the cooling coil A is defrosted, the bypass valve BA and the suction valve SB are opened, and the main valve MV, the bypass valve BB, and the suction valve SA are closed as in the warm gas defrost mode described above.
【００３１】冷媒入口１０から冷媒管１７に流入した液
冷媒は図５に示すようにバイパス管２１を通り、バイパ
ス枝管２１ａによりバイパス弁ＢＡを経て冷却コイルＡ
に送り込まれる。液冷媒は冷却コイルＡ内で顕熱により
コイルに残っている霜を融かし、戻し枝管２３ａおよび
戻し管２３により冷媒管１７におけるメイン弁ＭＶの下
流側に流れ込み、枝管１９ｂにより膨張弁１８ｂを経て
冷却コイルＢに送り込まれて気化し、冷熱を発生する。
冷却コイルＢからのガス冷媒は枝管２０ｂによりサクシ
ョン弁ＳＢを経て冷媒出口１１から冷媒復管１２に流れ
込み、冷凍機１へ戻される。The liquid refrigerant flowing from the refrigerant inlet 10 into the refrigerant pipe 17 passes through the bypass pipe 21 as shown in FIG. 5, and is cooled by the cooling coil A through the bypass valve BA by the bypass branch pipe 21a.
Sent to. The liquid refrigerant melts the frost remaining in the coil by sensible heat in the cooling coil A, flows downstream of the main valve MV in the refrigerant pipe 17 by the return branch pipe 23a and the return pipe 23, and expands by the branch pipe 19b. After passing through 18b, it is sent to the cooling coil B and vaporized to generate cold heat.
The gas refrigerant from the cooling coil B flows into the refrigerant return pipe 12 from the refrigerant outlet 11 through the branch valve 20b via the suction valve SB, and is returned to the refrigerator 1.
【００３２】＜ポンプダウンモード＞ポンプダウンモー
ドは前記ウォームガスデフロストおよび液デフロストが
終了した時点において冷却コイル内に残っている冷媒
を、次の冷却運転に支障がないように気化せしめて抜き
取るようになっており、冷却コイルＡを除霜した場合に
はサクション弁ＳＢが開、その他のメイン弁ＭＶ、バイ
パス弁ＢＡ、ＢＢおよびサクション弁ＳＡは全て閉とさ
れる。<Pump Down Mode> In the pump down mode, the refrigerant remaining in the cooling coil at the time when the warm gas defrosting and the liquid defrosting are completed is vaporized and extracted so as not to hinder the next cooling operation. When the cooling coil A is defrosted, the suction valve SB is opened, and the other main valves MV, bypass valves BA, BB, and suction valve SA are all closed.
【００３３】冷却コイルＡ内の液冷媒は図６に示すよう
に戻し枝管２３ａ、戻し管２３により冷媒管１７におけ
るメイン弁ＭＶの下流側に流れ込み、枝管１９ｂにより
膨張弁１８ｂを経て冷却コイルＢに送り込まれて気化
し、冷熱を発生する。冷却コイルＢからのガス冷媒は枝
管２０ｂによりサクション弁ＳＢを経て冷媒出口１１か
ら冷媒復管１２に流れ込み、冷凍機１へ戻される。As shown in FIG. 6, the liquid refrigerant in the cooling coil A flows through the return branch pipe 23a, the return pipe 23 downstream of the main valve MV in the refrigerant pipe 17, and the branch pipe 19b passes through the expansion valve 18b. It is sent to B and vaporized, generating cold heat. The gas refrigerant from the cooling coil B flows into the refrigerant return pipe 12 from the refrigerant outlet 11 through the branch valve 20b via the suction valve SB, and is returned to the refrigerator 1.
【００３４】ポンプダウンが終了したら、冷却モードに
戻って冷却運転が行われ、所定の時間が経過すると上述
した冷却コイルＡのデフロスト運転と同様に冷却コイル
Ｂのデフロスト運転が行われる。After the pump down is completed, the cooling mode is returned to the cooling mode to perform the cooling operation. After a predetermined time has elapsed, the defrost operation of the cooling coil B is performed in the same manner as the defrost operation of the cooling coil A described above.
【００３５】上述したように、一方の冷却コイルＡを除
霜している間に他方の冷却コイルＢでは常に冷却運転が
行われ、冷却コイルＡを除霜した後の冷媒を冷却コイル
Ｂで冷却に使用できて無駄がなく、しかも除霜運転によ
るショーケース内の温度上昇を極めて小にすることがで
きる。As described above, while one of the cooling coils A is being defrosted, the other cooling coil B always performs a cooling operation, and the refrigerant after the defrosting of the cooling coil A is cooled by the cooling coil B. The temperature rise in the showcase due to the defrosting operation can be made extremely small.
【００３６】ところで、冷凍機１がウォームガス供給モ
ードである間は両ショーケースともウォームガスデフロ
ストモード以外の運転モードとすることはできないが、
冷凍機が液冷媒供給モードである間は両ショーケース
８、９とも個別に冷却、液デフロストのいずれかの運転
モードとすることができる。By the way, while the refrigerator 1 is in the warm gas supply mode, the operating modes other than the warm gas defrost mode cannot be set in both showcases.
While the refrigerator is in the liquid refrigerant supply mode, both showcases 8 and 9 can be individually set to either the cooling mode or the liquid defrost operation mode.
【００３７】すなわち、本発明の装置では着霜量の最も
少ないショーケースの除霜が終了するまでは冷凍機から
全てのショーケースへウォームガスを供給して潜熱によ
るウォームガスデフロストを行い、その後冷凍機から全
てのショーケースへ液冷媒を供給して既に除霜が完了し
ているショーケースはポンプダウンモードを経て冷却モ
ードに切り換えられることによりショーケース内の温度
上昇が防止され、また除霜が完了していないショーケー
スはウォームガスデフロストに引き続いて顕熱による液
デフロストが行われることにより除霜不良が防止され
る。That is, in the apparatus of the present invention, worm gas is supplied to all showcases from the refrigerator to perform worm gas defrost by latent heat until the defrosting of the showcase with the least amount of frost is completed, and then the refrigeration is performed. The showcase, which has already supplied liquid refrigerant from the machine to all the showcases and has already completed defrosting, is switched to the cooling mode via the pump down mode, thereby preventing the temperature inside the showcase from rising and preventing defrosting. Incomplete showcases are subjected to liquid defrosting by sensible heat following warm gas defrosting, thereby preventing defective defrosting.
【００３８】次に、各ショーケースの冷却コイルＡを除
霜する場合における運転モードの切り換えの具体例を図
７〜９に示す冷凍機と各ショーケースにおける運転モー
ドと弁の開閉動作の関係を示すタイムチャートに基づい
て詳細に説明する。なお、これらの図において弁の開閉
動作欄の記号は〇が開、×が閉、△がショーケース内の
温度に応じて開閉制御されることを示す。Next, a specific example of the operation mode switching when the cooling coil A of each showcase is defrosted will be described with reference to the relationship between the operation mode and the valve opening / closing operation in the refrigerator and each showcase shown in FIGS. This will be described in detail based on the time chart shown. In these figures, the symbols in the valve opening / closing operation column indicate that 〇 is open, X is closed, and △ indicates that opening / closing is controlled according to the temperature in the showcase.
【００３９】図７は第１のショーケース８の着霜量が第
２のショーケース９に比べて大である場合、図８は第１
のショーケース８の着霜量が第２のショーケース９に比
べて小である場合、図９は両ショーケース８、９の着霜
量が同じである場合における各具体例を示している。FIG. 7 shows the case where the amount of frost formed on the first showcase 8 is larger than that of the second showcase 9.
9 shows a specific example where the amount of frost of the showcase 8 is smaller than that of the second showcase 9, and FIG. 9 shows a case where the amount of frost of the two showcases 8 and 9 is the same.
【００４０】まず、第１のショーケース８の着霜量が第
２のショーケース９に比べて大である場合について説明
する。各ショーケースの冷却運転時には冷凍機１の主液
弁ＭＶが開、主ガス弁ＭＧおよび容量調整弁用開閉弁Ｃ
ＰＶが閉で液冷媒供給モードとなっており、ショーケー
ス８、９においては例えば調温用サーモスタットからの
信号によりショーケース内の温度に応じてメイン弁ＭＶ
がサクション弁ＳＡ、ＳＢとともに適宜開閉されてショ
ーケース内が所定の温度に保たれ、バイパス弁ＢＡ、Ｂ
Ｂは閉ざされている。First, the case where the amount of frost formed on the first showcase 8 is larger than that on the second showcase 9 will be described. During the cooling operation of each showcase, the main liquid valve MV of the refrigerator 1 is opened, the main gas valve MG and the on-off valve C for the capacity adjusting valve are opened.
When the PV is closed, the liquid refrigerant supply mode is set. In the showcases 8 and 9, for example, the main valve MV according to the temperature in the showcase by a signal from a thermostat for temperature control.
Are appropriately opened and closed together with the suction valves SA and SB so that the inside of the showcase is maintained at a predetermined temperature, and the bypass valves BA and B
B is closed.
【００４１】タイマー等により予め設定されたデフロス
ト時刻になると制御装置からデフロスト開始指令（本実
施例では各ショーケースの冷却コイルＡに対するデフロ
スト開始指令）が冷凍機１および両ショーケース８、９
へ発せられ、冷凍機１においては主液弁ＭＬが閉成され
るとともに主ガス弁ＭＧおよび容量調整弁用開閉弁ＣＰ
Ｖが開成され、ショーケース８、９においてはメイン弁
ＭＶおよびサクション弁ＳＡが閉成されるとともにバイ
パス弁ＢＡおよびサクション弁ＳＢが開成される。When a defrost time set in advance by a timer or the like is reached, a defrost start command (in this embodiment, a defrost start command for the cooling coil A of each showcase) is sent from the control device to the refrigerator 1 and both showcases 8 and 9.
The main liquid valve ML is closed in the refrigerator 1 and the main gas valve MG and the on-off valve CP for the capacity adjusting valve
V is opened, and in the showcases 8 and 9, the main valve MV and the suction valve SA are closed, and the bypass valve BA and the suction valve SB are opened.
【００４２】上述した弁の開閉動作により第１および第
２のショーケース８、９における各冷却コイルＡにウォ
ームガスが供給され、ウォームガスの潜熱による除霜が
行われる。The worm gas is supplied to each of the cooling coils A in the first and second showcases 8 and 9 by the opening / closing operation of the valve described above, and defrosting is performed by the latent heat of the worm gas.
【００４３】着霜量の少ない第２のショーケース９にお
ける冷却コイルＡの除霜が終了すると、除霜の終了によ
る冷却コイルＡの出口配管温度の上昇が前記制御装置に
より検知され、この制御装置から冷凍機１および除霜が
終了した第２のショーケース９にデフロスト復帰指令が
発せられる。冷凍機１においては、デフロスト復帰指令
が発せられると主液弁ＭＶが開成されるとともに主ガス
弁ＭＧが閉成されて液冷媒供給モードに切り換えられ
る。When the defrosting of the cooling coil A in the second showcase 9 with a small amount of frost is completed, an increase in the outlet pipe temperature of the cooling coil A due to the completion of the defrost is detected by the control device. , A defrost return command is issued to the refrigerator 1 and the second showcase 9 after the defrosting is completed. In the refrigerator 1, when the defrost return command is issued, the main liquid valve MV is opened and the main gas valve MG is closed to switch to the liquid refrigerant supply mode.
【００４４】除霜が終了した第２のショーケース９にお
いては、バイパス弁ＢＡが閉成され、ポンプダウンモー
ドを経た後、メイン弁ＭＶ、サクション弁ＳＡ、ＳＢが
開成されて冷却モードに復帰する。この冷却モードにお
いてもメイン弁ＭＶおよびサクション弁ＳＡ、ＳＢはシ
ョーケース内の温度に応じて適宜開閉制御される。In the second showcase 9 in which the defrosting has been completed, the bypass valve BA is closed, and after passing through the pump down mode, the main valve MV, the suction valves SA, SB are opened, and the operation returns to the cooling mode. . Also in this cooling mode, the main valve MV and the suction valves SA and SB are controlled to open and close as appropriate according to the temperature inside the showcase.
【００４５】一方、除霜が終了していない第１のショー
ケース８においては、各弁はウォームガスデフロストモ
ードにおける開閉状態が維持され、ウォームガスに代わ
って冷凍機からの液冷媒が冷却コイルＡに供給され、液
冷媒の顕熱による液デフロストが行われる。On the other hand, in the first showcase 8 in which defrosting has not been completed, each valve is kept open and closed in the worm gas defrost mode, and the liquid refrigerant from the refrigerator is replaced with the cooling coil A in place of the worm gas. And the liquid defrost is performed by the sensible heat of the liquid refrigerant.
【００４６】第１のショーケース８の除霜が終了する
と、除霜の終了による冷却コイルＡの出口配管温度の上
昇が前記制御装置により検知され、この制御装置から除
霜が終了した第１のショーケース８にデフロスト復帰指
令が発せられる。When the defrosting of the first showcase 8 is completed, an increase in the outlet pipe temperature of the cooling coil A due to the completion of the defrosting is detected by the control device, and the first defrosting completed by the control device. A defrost return command is issued to the showcase 8.
【００４７】デフロスト復帰指令が発せられると、同シ
ョーケース８のバイパス弁ＢＡが閉成されてポンプダウ
ンモードに移り、ポンプダウンモードを経た後、メイン
弁ＭＶ、サクション弁ＳＡ、ＳＢが開成されて冷却モー
ドに復帰する。この冷却モードにおいてもメイン弁ＭＶ
およびサクション弁ＳＡ、ＳＢはショーケース内の温度
に応じて適宜開閉制御される。When a defrost return command is issued, the bypass valve BA of the showcase 8 is closed to shift to the pump down mode. After the pump down mode, the main valve MV and the suction valves SA and SB are opened. Return to cooling mode. Even in this cooling mode, the main valve MV
In addition, the suction valves SA and SB are appropriately opened and closed according to the temperature in the showcase.
【００４８】また、第１のショーケース８の着霜量が第
２のショーケース９に比べて小である場合においては、
上述した弁の開閉動作および作用が第１と第２のショー
ケースで入れ替わるだけであり、図８に示すように着霜
量の少ない第１のショーケース８が先にデフロストを終
了してポンプダウンモードを経て冷却運転に復帰し、第
２のショーケース９では液デフロストで十分に除霜を行
った後、ポンプダウンモードを経て冷却運転に復帰す
る。When the amount of frost on the first showcase 8 is smaller than that on the second showcase 9,
The opening / closing operation and action of the above-described valve are merely interchanged between the first and second showcases. As shown in FIG. 8, the first showcase 8 with a small amount of frost first stops defrosting and pumps down. After returning to the cooling operation via the mode, the second showcase 9 performs sufficient defrosting with the liquid defrost, and then returns to the cooling operation via the pump down mode.
【００４９】両ショーケースの着霜量が同じである場合
には、図９に示すように両ショーケース８、９とも液デ
フロストモードが行われずにウォームガスデフロストモ
ードからポンプダウンモードを経て冷却モードに復帰す
る。When the frost formation amounts of both showcases are the same, as shown in FIG. 9, both showcases 8 and 9 do not perform the liquid defrost mode but go from the warm gas defrost mode to the cooling mode via the pump down mode. Return to.
【００５０】[0050]
【発明の作用、効果】本発明に係る複数ショーケースの
冷却装置は上述した構成のものとしてあるので、次の作
用、効果を奏し得る。除霜運転が開始されると冷凍機か
ら全てのショーケースに受液器内の非凝縮冷媒たるウォ
ームガスが送られ、いずれかのショーケースにおいて除
霜が終了すると冷凍機から全てのショーケースに受液器
内の液冷媒が送られるので、着霜量の小なるショーケー
スにおいてはウォームガスの潜熱により短時間で十分な
除霜が行われた後、冷凍機から供給される液冷媒により
冷却運転される。Since the cooling device for a plurality of showcases according to the present invention has the above-described configuration, the following operation and effect can be obtained. When the defrosting operation is started, warm gas as a non-condensed refrigerant in the receiver is sent from the refrigerator to all showcases, and when defrosting is completed in any one of the showcases, the refrigerator sends the show gas to all showcases. Since the liquid refrigerant in the receiver is sent, in a showcase where the amount of frost is small, sufficient defrost is performed in a short time by the latent heat of the warm gas, and then cooled by the liquid refrigerant supplied from the refrigerator. Be driven.
【００５１】一方、着霜量の大なるショーケースにおい
てはウォームガスによる除霜が終了した後、冷凍機から
供給される液冷媒によってさらに液冷媒の顕熱による十
分な除霜が行われる。On the other hand, in the showcase where the amount of frost is large, after the defrosting by the warm gas is completed, the liquid refrigerant supplied from the refrigerator further performs sufficient defrosting by the sensible heat of the liquid refrigerant.
【００５２】したがって、個々のショーケースに対し、
着霜量に応じた必要かつ十分な除霜を行うことができ、
ショーケース内の温度上昇や除霜不良を防止することが
できる。Therefore, for each showcase,
It is possible to perform necessary and sufficient defrost according to the amount of frost,
It is possible to prevent a rise in the temperature in the showcase and poor defrosting.
【００５３】また、受液器からのウォームガスを除霜に
利用するタイプの従来の冷却装置ではウォームガスを低
圧側配管によりショーケースへ送るのが一般的であった
が、本発明の装置ではウォームガスを冷凍機からショー
ケースへ液冷媒を送る高圧側配管たる冷媒往管によりシ
ョーケースに送るので、冷凍機とショーケースとの間に
ウォームガス用の特別な配管は不要であり、容易に施工
することができる。In a conventional cooling device of the type utilizing worm gas from a liquid receiver for defrosting, worm gas is generally sent to a showcase through a low-pressure pipe, but in the device of the present invention. Since the warm gas is sent to the showcase by the refrigerant outgoing pipe, which is the high-pressure pipe that sends the liquid refrigerant from the refrigerator to the showcase, no special warm gas piping is required between the refrigerator and the showcase. Can be constructed.
【図１】本発明に係る冷却装置の実施例を示す構成図。FIG. 1 is a configuration diagram showing an embodiment of a cooling device according to the present invention.
【図２】ショーケースの構造の一具体例を示す縦断面
図。FIG. 2 is a longitudinal sectional view showing a specific example of the structure of a showcase.
【図３】冷却モードにおけるショーケース内での冷媒の
流れを示す構成図。FIG. 3 is a configuration diagram showing a flow of a refrigerant in a showcase in a cooling mode.
【図４】ウォームガスデフロストモードにおけるショー
ケース内での冷媒の流れを示す構成図。FIG. 4 is a configuration diagram showing a flow of a refrigerant in a showcase in a warm gas defrost mode.
【図５】液デフロストモードにおけるショーケース内で
の冷媒の流れを示す構成図。FIG. 5 is a configuration diagram showing a flow of a refrigerant in a showcase in a liquid defrost mode.
【図６】ポンプダウンモードにおけるショーケース内で
の冷媒の流れを示す構成図。FIG. 6 is a configuration diagram showing a flow of a refrigerant in a showcase in a pump down mode.
【図７】運転モードと弁の開閉動作の関係の具体例を示
すタイムチャート。FIG. 7 is a time chart showing a specific example of a relationship between an operation mode and a valve opening / closing operation.
【図８】運転モードと弁の開閉動作の関係の他の具体例
を示すタイムチャート。FIG. 8 is a time chart showing another specific example of the relationship between the operation mode and the valve opening / closing operation.
【図９】運転モードと弁の開閉動作の関係のさらに他の
具体例を示すタイムチャート。FIG. 9 is a time chart showing still another specific example of the relationship between the operation mode and the valve opening / closing operation.
１ 冷凍機 ２ 圧縮機 ３ 吐出管 ４ 凝縮器 ５ 冷媒管 ５ａ 流量調整弁 ６ 凝縮器 ６ａ 冷媒入口 ６ｂ 液冷媒出口 ６ｃ ガス冷媒出
口 ７ 冷媒往管 ８、９ ショーケース １０ ショーケースの冷媒入口 １１ ショーケー
スの冷媒出口 １２ 冷媒復管 １３ アキュムレ
ータ １４ 吸入管 １５ 送ガス管 １５ａ 流量調整弁 １６ 分岐管 １６ａ 容量調整弁 １７ 冷媒管 １８ａ、１８ｂ 膨
張弁 １９ａ、１９ｂ 枝管 ２０ａ、２０ｂ 枝
管 ２１ バイパス管 ２１ａ、２１ｂ バ
イパス枝管 ２２ａ、２２ｂ 逆止弁 ２３ 戻し管 ２３ａ、２３ｂ 戻
し枝管 ２４ ショーケース本体 ２５ａ、２５ｂ、２５ｃ 空気通路 ２６ ファン ２７ 吸気口 ２８ 吹出口 ２９ 補助ヒータ ３０ 商品陳列棚 Ａ、Ｂ 冷却コイル ＭＬ 主液弁 ＭＧ 主ガス弁 ＭＶ メイン弁 ＣＰＶ 容量調整弁用開閉弁 ＢＡ、ＢＢ バイパス弁 ＳＡ、ＳＢ サクシ
ョン弁DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Compressor 3 Discharge pipe 4 Condenser 5 Refrigerant pipe 5a Flow control valve 6 Condenser 6a Refrigerant inlet 6b Liquid refrigerant outlet 6c Gas refrigerant outlet 7 Refrigerant forward pipe 8, 9 Showcase 10 Refrigerant inlet of showcase 11 Show Refrigerant outlet of case 12 Refrigerant return pipe 13 Accumulator 14 Suction pipe 15 Gas supply pipe 15a Flow control valve 16 Branch pipe 16a Capacity control valve 17 Refrigerant pipe 18a, 18b Expansion valve 19a, 19b Branch pipe 20a, 20b Branch pipe 21 Bypass pipe 21a , 21b bypass branch pipes 22a, 22b check valve 23 return pipe 23a, 23b return branch pipe 24 showcase body 25a, 25b, 25c air passage 26 fan 27 intake port 28 blowout port 29 auxiliary heater 30 product display shelf A, B cooling Coil ML Main liquid valve MG Main gas valve MV Main valve CPV Capacity adjusting valve Off valve BA, BB bypass valve SA, SB suction valve
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｆ２５Ｂ 47/02 ５６０ Ｆ２５Ｂ 47/02 ５６０ ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification code FI F25B 47/02 560 F25B 47/02 560
Claims (2)
機の前記受液器の液冷媒出口に一端を接続した冷媒往管
の他端と、前記圧縮機の吸入側に一端を接続した冷媒復
管の他端との間に、それぞれ冷媒入口から同出口に至る
冷媒管に膨張弁と冷却コイルを設けた複数のショーケー
スを並列に接続し、前記冷媒往管に、冷却運転時は開か
れているが除霜運転開始時に閉成され、前記複数のショ
ーケースのうちいずれかのショーケースにおける冷却コ
イルの除霜が終了すると開成される主液弁を設けるとと
もに、前記受液器に、この受液器の気相に臨むガス冷媒
出口を設けて同出口に一端を接続した送ガス管の他端を
前記冷媒往管における主液弁の下流側に接続し、この送
ガス管に、冷却運転時は閉ざされているが除霜運転開始
時に開成され、前記複数のショーケースのうちいずれか
のショーケースにおける冷却コイルの除霜が終了すると
閉成される主ガス弁を設け、また前記各ショーケースの
膨張弁よりも上流側の冷媒管に、冷却運転時はショーケ
ース内の温度に応じて適宜開閉されるが除霜運転開始時
に閉成され、ショーケース内における冷却コイルの除霜
が終了すると開成されるメイン弁を設けるとともに、こ
のメイン弁よりも上流側に一端を接続したバイパス管の
他端を冷却コイルの入口に接続してこのバイパス管に、
冷却運転時は閉ざされているが除霜運転開始時に開成さ
れ、ショーケース内における冷却コイルの除霜が終了す
ると閉成されるバイパス弁を設けてなる複数ショーケー
スの冷却装置。1. A refrigerating machine comprising a compressor, a condenser and a liquid receiver, one end of which is connected to a liquid refrigerant outlet of the liquid receiver and one end of which is connected to a suction side of the compressor. A plurality of showcases each provided with an expansion valve and a cooling coil in a refrigerant pipe from the refrigerant inlet to the same outlet are connected in parallel with the other end of the refrigerant return pipe, and the refrigerant forward pipe is connected to the refrigerant outgoing pipe during cooling operation. Is opened but closed at the start of the defrosting operation, and provided with a main liquid valve which is opened when defrosting of the cooling coil in any one of the plurality of showcases is completed, and A gas refrigerant outlet facing the gas phase of the receiver is provided, and the other end of the gas feed pipe having one end connected to the outlet is connected to the downstream side of the main liquid valve in the refrigerant forward pipe. At the time of cooling operation, it is closed, but it is opened at the start of defrosting operation. A main gas valve that is closed when the defrosting of the cooling coil in any one of the plurality of showcases is completed is provided, and a refrigerant pipe upstream of the expansion valve of each of the showcases is provided with a cooling valve during cooling operation. Is opened and closed appropriately according to the temperature in the showcase, but is closed at the start of the defrosting operation, and is provided with a main valve which is opened when the defrosting of the cooling coil in the showcase is completed. The other end of the bypass pipe, one end of which is connected to the inlet of the cooling coil, is connected to this bypass pipe,
A cooling device for a plurality of showcases, which is provided with a bypass valve which is closed during a cooling operation but is opened at the start of a defrosting operation and is closed when defrosting of a cooling coil in the showcase is completed.
機の前記受液器の液冷媒出口に一端を接続した冷媒往管
の他端と、前記圧縮機の吸入側に一端を接続した冷媒復
管の他端との間に、それぞれ冷媒入口から同出口に至る
冷媒管に膨張弁と冷却コイルを設けた複数のショーケー
スを並列に接続し、前記冷媒往管に、冷却運転時は開か
れているが除霜運転開始時に閉成され、前記複数のショ
ーケースのうちいずれかのショーケースにおける冷却コ
イルの除霜が終了すると開成される主液弁を設けるとと
もに、前記受液器に、この受液器の気相に臨むガス冷媒
出口を設けて同出口に一端を接続した送ガス管の他端を
前記冷媒往管における主液弁の下流側に接続し、この送
ガス管に、冷却運転時は閉ざされているが除霜運転開始
時に開成され、前記複数のショーケースのうちいずれか
のショーケースにおける冷却コイルの除霜が終了すると
閉成される主ガス弁を設け、また前記各ショーケースの
膨張弁よりも上流側の冷媒管に、冷却運転時はショーケ
ース内の温度に応じて適宜開閉されるが除霜運転開始時
に閉成され、ショーケース内における冷却コイルの除霜
が終了すると開成されるメイン弁を設けるとともに、こ
のメイン弁よりも上流側に一端を接続したバイパス管の
他端を冷却コイルの入口に接続してこのバイパス管に、
冷却運転時は閉ざされているが除霜運転開始時に開成さ
れ、ショーケース内における冷却コイルの除霜が終了す
ると閉成されるバイパス弁を設け、さらに、タイマーに
より予め設定された時刻になるとデフロスト開始指令を
前記冷凍機および各ショーケースに発し、また各ショー
ケースの除霜が終了して冷却コイルの出口配管温度が所
定の温度に達すると冷凍機および除霜が終了したショー
ケースにデフロスト復帰指令を発する制御装置を備え、
制御装置からデフロスト開始指令が発せられると冷凍機
における前記主液弁および各ショーケースの前記メイン
弁が閉成されるとともに、冷凍機の主ガス弁および各シ
ョーケースのバイパス弁が開成されて全てのショーケー
スの冷却コイルに受液器からのガス冷媒が供給されてガ
ス冷媒の潜熱による除霜が行われ、また、デフロスト復
帰指令が発せられると冷凍機の主液弁が開成されるとと
もに主ガス弁が閉成されて冷凍機から全てのショーケー
スに液冷媒が供給され、除霜が終了していないショーケ
ースにおいてはメイン弁が閉、バイパス弁が開のままで
冷却コイルに前記バイパス管から液冷媒が供給されてこ
の液冷媒の顕熱による除霜が行われ、除霜が終了したシ
ョーケースにおいてはメイン弁が開成されるとともにバ
イパス弁が閉成されて冷却運転が行われることを特徴と
する複数ショーケースの冷却装置。2. A refrigerating machine comprising a compressor, a condenser and a liquid receiver, one end of which is connected to a liquid refrigerant outlet of the liquid receiver and one end of which is connected to a suction side of the compressor. A plurality of showcases each provided with an expansion valve and a cooling coil in a refrigerant pipe from the refrigerant inlet to the same outlet are connected in parallel with the other end of the refrigerant return pipe, and the refrigerant forward pipe is connected to the refrigerant outgoing pipe during cooling operation. Is opened but closed at the start of the defrosting operation, and provided with a main liquid valve which is opened when defrosting of the cooling coil in any one of the plurality of showcases is completed, and A gas refrigerant outlet facing the gas phase of the receiver is provided, and the other end of the gas feed pipe having one end connected to the outlet is connected to the downstream side of the main liquid valve in the refrigerant forward pipe. At the time of cooling operation, it is closed, but it is opened at the start of defrosting operation. A main gas valve that is closed when the defrosting of the cooling coil in any one of the plurality of showcases is completed is provided, and a refrigerant pipe upstream of the expansion valve of each of the showcases is provided with a cooling valve during cooling operation. Is opened and closed appropriately according to the temperature in the showcase, but is closed at the start of the defrosting operation, and is provided with a main valve which is opened when the defrosting of the cooling coil in the showcase is completed. The other end of the bypass pipe, one end of which is connected to the inlet of the cooling coil, is connected to this bypass pipe,
A bypass valve that is closed during the cooling operation but is opened at the start of the defrosting operation and is closed when the defrosting of the cooling coil in the showcase is completed. A start command is issued to the refrigerator and each showcase, and when defrosting of each showcase is completed and the outlet pipe temperature of the cooling coil reaches a predetermined temperature, defrosting is returned to the refrigerator and the showcase where the defrosting is completed. Equipped with a control device that issues commands,
When a defrost start command is issued from the control device, the main liquid valve in the refrigerator and the main valve of each showcase are closed, and the main gas valve of the refrigerator and the bypass valve of each showcase are opened and all The gas refrigerant from the receiver is supplied to the cooling coil of the showcase to perform defrosting by the latent heat of the gas refrigerant, and when a defrost return command is issued, the main liquid valve of the refrigerator is opened and the main refrigerant valve is opened. When the gas valve is closed and liquid refrigerant is supplied from the refrigerator to all the showcases, and in the showcase where defrosting has not been completed, the main valve is closed and the bypass valve is opened while the bypass pipe is connected to the cooling coil. Liquid refrigerant is supplied from the refrigeration unit to perform defrost by the sensible heat of the liquid refrigerant. In the showcase where the defrost is completed, the main valve is opened and the bypass valve is closed. The cooling operation Te is made the cooling device of the plurality showcase characterized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8356053A JP3013296B2 (en) | 1996-12-25 | 1996-12-25 | Multiple showcase cooling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8356053A JP3013296B2 (en) | 1996-12-25 | 1996-12-25 | Multiple showcase cooling system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10185414A JPH10185414A (en) | 1998-07-14 |
| JP3013296B2 true JP3013296B2 (en) | 2000-02-28 |
Family
ID=18447091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8356053A Expired - Fee Related JP3013296B2 (en) | 1996-12-25 | 1996-12-25 | Multiple showcase cooling system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3013296B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100553856C (en) * | 2006-10-19 | 2009-10-28 | 株式会社神户制钢所 | Flux-cored wire for gas shielded arc welding for creep-resisting steels |
-
1996
- 1996-12-25 JP JP8356053A patent/JP3013296B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100553856C (en) * | 2006-10-19 | 2009-10-28 | 株式会社神户制钢所 | Flux-cored wire for gas shielded arc welding for creep-resisting steels |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10185414A (en) | 1998-07-14 |
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