JP3342130B2 - Refrigeration equipment - Google Patents
Refrigeration equipmentInfo
- Publication number
- JP3342130B2 JP3342130B2 JP26813793A JP26813793A JP3342130B2 JP 3342130 B2 JP3342130 B2 JP 3342130B2 JP 26813793 A JP26813793 A JP 26813793A JP 26813793 A JP26813793 A JP 26813793A JP 3342130 B2 JP3342130 B2 JP 3342130B2
- Authority
- JP
- Japan
- Prior art keywords
- compressor
- valve
- defrosting
- refrigerant
- defrosting 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.)
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/22—Disposition of valves, e.g. of on-off valves or flow control valves between evaporator and compressor
-
- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Defrosting Systems (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、冷凍装置の改良に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a refrigeration system.
【０００２】[0002]
【従来の技術】空気熱源式の冷凍装置により冷凍ショー
ケース内を冷却する際に、熱交換器の表面に霜が成長
し、所定の冷却能力が得られなることは知られている。
このために、この霜をとる除霜（デフロスト）運転を行
う必要がある。この除霜運転は圧縮機を止め、除霜用の
電磁弁を開いた後、再び圧縮機を起動し、単純ホットガ
スを熱交換器に流すことにより行われる。2. Description of the Related Art It is known that when cooling the inside of a freezer showcase by a refrigerating apparatus of an air heat source type, frost grows on the surface of a heat exchanger and a predetermined cooling capacity cannot be obtained.
Therefore, it is necessary to perform a defrosting operation for removing the frost. This defrosting operation is performed by stopping the compressor, opening the electromagnetic valve for defrosting, starting the compressor again, and flowing simple hot gas to the heat exchanger.
【０００３】[0003]
【発明が解決しようとする課題】しかし、圧縮機を再起
動する際に、圧縮機の吐出側と吸込側の圧力差が大きい
と、圧縮機に大きな負荷がかかり、圧縮機の始動をスム
ーズに行えず、始動不良や圧縮不良の原因となるという
問題がある。However, when restarting the compressor, if the pressure difference between the discharge side and the suction side of the compressor is large, a large load is applied to the compressor and the compressor can be started smoothly. There is a problem that it is not possible to do so, resulting in poor starting and poor compression.
【０００４】そこで、従来では、圧縮機の吐出側と吸込
側の圧力差が少なくなるまでの時間、たとえば約５分間
程度、圧縮機を再起動せず、その５分間後に除霜運転に
入るようにしている。この場合に、約５分間除霜運転時
間が長くなってしまうという問題がある。Therefore, conventionally, the compressor is not restarted until the pressure difference between the discharge side and the suction side of the compressor becomes small, for example, about 5 minutes, and the defrosting operation is started 5 minutes after that. I have to. In this case, there is a problem that the defrosting operation time becomes longer for about 5 minutes.
【０００５】本発明は上記課題を解決するためになされ
たものであり、圧縮機をスムーズに始動して短時間のう
ちに行う除霜運転をすることができる冷凍装置を提供す
ることを目的としている。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a refrigeration apparatus capable of performing a defrosting operation in a short time by smoothly starting a compressor. I have.
【０００６】[0006]
【課題を解決するための手段】そこで、本発明の冷凍装
置は、冷却運転から除霜運転に切り換わる時に、除霜回
路中の開閉弁を開くとともに、この開閉弁を開いた時点
から一定時間遅らせて圧縮機を起動する制御装置を備え
ることを特徴とする。Therefore, the refrigerating apparatus of the present invention opens the on-off valve in the defrost circuit when switching from the cooling operation to the defrosting operation, and for a certain period of time from when the on-off valve is opened. It is characterized by including a control device for starting the compressor with a delay.
【０００７】[0007]
【作用】冷却運転から除霜運転時に入る時には、圧縮機
の運転を一定時間遅らせて、しかも開閉弁を開くことに
より、圧縮機の前後における冷媒の圧力を平衡状態にし
てから除霜運転を行う。When the defrosting operation is started from the cooling operation, the operation of the compressor is delayed for a certain period of time, and by opening the on-off valve, the pressure of the refrigerant before and after the compressor is equilibrated, and then the defrosting operation is performed. .
【０００８】[0008]
【実施例】以下に、本発明の好適な実施例を、添付図面
に基づいて詳細に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
【０００９】図１は、本発明の冷凍装置１の外観を示し
ている。この冷凍装置１は、たとえばショーケースとし
て店舗に設定されるものであり、図２に示す冷媒回路を
有している。FIG. 1 shows the appearance of a refrigeration system 1 of the present invention. The refrigeration apparatus 1 is set in a store as a showcase, for example, and has a refrigerant circuit shown in FIG.
【００１０】図２に示す冷媒回路では、単純ホットガス
を蒸発器１０に流して除霜運転を行うための回路を有し
ている。The refrigerant circuit shown in FIG. 2 has a circuit for flowing a simple hot gas to the evaporator 10 to perform a defrosting operation.
【００１１】図２において、この冷媒回路の蒸発器１０
は、第１のアキュムレータ１２、熱交換部１４、第２の
アキュムレータ１６を介して、吸入圧力調整弁１８に接
続されている。In FIG. 2, the evaporator 10 of this refrigerant circuit
Is connected to a suction pressure regulating valve 18 via a first accumulator 12, a heat exchange section 14, and a second accumulator 16.
【００１２】吸入圧力調整弁１８は、第３のアキュムレ
ータ２０と逆止弁２２を介して、ロータリ圧縮機２４に
接続されている。この逆止弁２２は、圧縮機２４が起動
する時にオイルが戻らないようにするものである。圧縮
機２４には、キャピラリーチューブ２６、電磁弁２８、
蒸発パイプ３０が並列に接続されている。The suction pressure regulating valve 18 is connected to a rotary compressor 24 via a third accumulator 20 and a check valve 22. The check valve 22 prevents oil from returning when the compressor 24 starts. In the compressor 24, a capillary tube 26, a solenoid valve 28,
Evaporation pipes 30 are connected in parallel.
【００１３】蒸発パイプ３０は、凝縮器３２を介してレ
シーバタンク３４に接続されている。レシーバタンク３
４は、上記キャピラリーチューブ２６に接続されるとと
もに、熱交換部１４と膨張弁３６を通って上記蒸発器１
０に接続されている。The evaporating pipe 30 is connected to a receiver tank 34 via a condenser 32. Receiver tank 3
The evaporator 1 is connected to the capillary tube 26 and passes through the heat exchange section 14 and the expansion valve 36.
Connected to 0.
【００１４】図２に示す幾つかの実線の矢印は、冷却運
転時の冷媒の流れを示している。これに対して、幾つか
の破線の矢印は、除霜時（デフロスト）の冷媒の流れを
示している。Some solid arrows shown in FIG. 2 indicate the flow of the refrigerant during the cooling operation. On the other hand, some broken arrows show the flow of the refrigerant at the time of defrosting (defrost).
【００１５】冷却運転時の冷媒は、凝縮器３２からレシ
ーバタンク３４を通り、膨張弁３６と圧縮機２４側に流
れる。During the cooling operation, the refrigerant flows from the condenser 32 to the expansion valve 36 and the compressor 24 through the receiver tank 34.
【００１６】そして、膨張弁３６側に流れた冷媒は、蒸
発器１０を通り、アキュムレータ１２と熱交換部１４を
経て、アキュムレータ１６と吸入圧力調整弁１８、アキ
ュムレータ２０と逆止弁２２を経て、圧縮機２４に達す
る。 そして、圧縮機２４で圧縮された冷媒は、蒸発パ
イプ３０を通り、凝縮器３２に至る。このレシーバタン
ク３４からキャピラリーチューブ２６を通して圧縮機２
４に冷媒を戻すのは、いわゆるリキッド・インジェクシ
ョンにより、圧縮機２４のモータ等を冷却するためであ
る。The refrigerant flowing to the expansion valve 36 passes through the evaporator 10, passes through the accumulator 12 and the heat exchange section 14, passes through the accumulator 16 and the suction pressure regulating valve 18, passes through the accumulator 20 and the check valve 22, Compressor 24 is reached. Then, the refrigerant compressed by the compressor 24 passes through the evaporation pipe 30 and reaches the condenser 32. Compressor 2 passes through capillary tube 26 from receiver tank 34
The reason why the refrigerant is returned to 4 is to cool the motor and the like of the compressor 24 by so-called liquid injection.
【００１７】また、冷媒ガスが液の状態のまま圧縮機２
４に入ってしまうと、圧縮機２４が故障を起こす。Further, the compressor 2 remains in a state where the refrigerant gas is in a liquid state.
When it enters 4, the compressor 24 fails.
【００１８】そこで、吸入圧力調整弁１８は、冷媒の圧
力をたとえば５気圧から２気圧に減圧して、冷媒の液化
を防止している。Therefore, the suction pressure regulating valve 18 reduces the pressure of the refrigerant from, for example, 5 atm to 2 atm to prevent the refrigerant from being liquefied.
【００１９】制御装置１００は、少なくとも圧縮機２４
と、電磁弁２８に接続されていて、これらの機能をコン
トロールできるようになっている。The control device 100 includes at least the compressor 24
Are connected to the electromagnetic valve 28 so that these functions can be controlled.
【００２０】次に、除霜時の冷媒は、破線の矢印で示す
ように、圧縮機２４から電磁弁２８を介して、蒸発器１
０に入り、蒸発器１０を除霜した後、アキュムレータ１
２、熱交換部１４、アキュムレータ１６を通り、吸入圧
力調整弁１８とアキュムレータ２０と逆止弁２２を経
て、圧縮機２４に戻る。Next, the refrigerant at the time of defrosting is supplied from the compressor 24 via the solenoid valve 28 to the evaporator 1 as shown by the broken arrow.
0, and after defrosting the evaporator 10, the accumulator 1
2. The heat passes through the heat exchange section 14 and the accumulator 16, passes through the suction pressure regulating valve 18, the accumulator 20, and the check valve 22, and returns to the compressor 24.
【００２１】次に、図４を参照して、上記構成の冷媒回
路における冷却運転と除霜（デフロスト）運転について
説明する。Next, a cooling operation and a defrosting (defrosting) operation in the refrigerant circuit having the above configuration will be described with reference to FIG.
【００２２】この冷却運転と除霜（デフロスト）運転
は、図２の制御装置１００の制御に基づいて行われる。The cooling operation and the defrosting (defrosting) operation are performed under the control of the control device 100 shown in FIG.
【００２３】図４において、圧縮機２４は冷却状態で
は、断続運転が行われる。この冷却運転の際には、ドレ
ンパンヒータは停止しており、クリーリングファンヒー
タ（ＦＭ、送風機）は連続運転している。また、図２の
電磁弁２８は閉じている。In FIG. 4, when the compressor 24 is in a cooling state, an intermittent operation is performed. During this cooling operation, the drain pan heater is stopped, and the creeping fan heater (FM, blower) is operating continuously. Further, the solenoid valve 28 in FIG. 2 is closed.
【００２４】次に、除霜運転時には、圧縮機２４の起動
は、一定時間Ｔだけ遅延させる。この時、電磁弁２８は
開く。これによれば、圧縮機２４の吐出側の圧力は電磁
弁２８を通じて蒸発器１０に逃げるので、圧縮機２４の
前後の圧力差は少なくなる。そして一定時間Ｔを経過後
に、圧縮機２４を始動して運転を行う。Next, during the defrosting operation, the activation of the compressor 24 is delayed by a certain time T. At this time, the solenoid valve 28 opens. According to this, since the pressure on the discharge side of the compressor 24 escapes to the evaporator 10 through the electromagnetic valve 28, the pressure difference before and after the compressor 24 is reduced. Then, after a lapse of a predetermined time T, the compressor 24 is started to operate.
【００２５】除霜運転時には、ドレンパンヒータは駆動
しており、クリーリングファンヒータ（ＦＭ、送風機）
は停止している。また、電磁弁２８は開いている。During the defrosting operation, the drain pan heater is driven, and the cooling fan heater (FM, blower)
Has stopped. Further, the solenoid valve 28 is open.
【００２６】この実施例においては、一定時間Ｔは、た
とえば１０秒程度あり、従来の約５分に比べて非常に短
い時間ですむ。In this embodiment, the fixed time T is, for example, about 10 seconds, which is much shorter than the conventional time of about 5 minutes.
【００２７】除霜運転開始後、所定の時間Ｔ１が過ぎる
と、圧縮機２４は水切りを行う。除霜運転終了後は、所
定時間Ｔ２の間圧縮機２４のファンを遅延して駆動し、
ドレンパンヒータも駆動する。After a predetermined time T1 has passed after the start of the defrosting operation, the compressor 24 drains water. After the completion of the defrosting operation, the fan of the compressor 24 is driven with a delay for a predetermined time T2,
The drain pan heater is also driven.
【００２８】以上説明したように、いわゆる単純ホット
ガスを用いて、図２の蒸発器１０を除霜する場合に、制
御装置１００は、除霜運転を開始する直前に図２の電磁
弁２８を開き、圧縮機２４の除霜運転の開始をわずかな
時間遅らせる。As described above, when defrosting the evaporator 10 shown in FIG. 2 using a so-called simple hot gas, the control device 100 controls the solenoid valve 28 shown in FIG. 2 immediately before starting the defrosting operation. Open to delay the start of the defrosting operation of the compressor 24 for a short time.
【００２９】したがって、圧縮機２４の前後の圧力差を
無くすか圧縮機２４の前後の圧力を平衡状態にすること
ができるので、従来に比べて圧縮機２４の始動をスムー
ズに行うことができる。Therefore, the pressure difference before and after the compressor 24 can be eliminated or the pressure before and after the compressor 24 can be equilibrated, so that the compressor 24 can be started more smoothly than in the prior art.
【００３０】次に、図３の別の実施例を説明する。ただ
し、図２の実施例と同様の箇所には、同じ符号を記し
て、その説明を省略する。Next, another embodiment of FIG. 3 will be described. However, the same parts as those in the embodiment of FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.
【００３１】図３の実施例と図２の実施例の異なる点
は、アキュムレータ１６と圧縮機２４が、逆止弁２２だ
けを介して、接続されていることである。図３の実施例
においても、図２の実施例と同様に除霜運転を行うこと
ができる。The difference between the embodiment of FIG. 3 and the embodiment of FIG. 2 is that the accumulator 16 and the compressor 24 are connected only via the check valve 22. In the embodiment of FIG. 3, the defrosting operation can be performed similarly to the embodiment of FIG.
【００３２】ところで、本発明は、上記実施例に限定さ
れず、本発明の要旨を逸脱しない範囲において、種々の
変更をすることができる。Incidentally, the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the gist of the present invention.
【００３３】[0033]
【発明の効果】以上述べたように、本発明によれば、圧
縮機の吐出側の圧力と吸込側の圧力を即座に平衡状態に
することができるので、短時間のうちに圧縮機をスムー
ズに始動して除霜運転をすることができる。As described above, according to the present invention, the pressure on the discharge side and the pressure on the suction side of the compressor can be immediately equilibrated, so that the compressor can be smoothly operated in a short time. To start the defrosting operation.
【図１】本発明の冷凍装置の実施例の外観を示す斜視
図。FIG. 1 is a perspective view showing the appearance of an embodiment of a refrigeration apparatus of the present invention.
【図２】図１の実施例の冷媒回路を示す図。FIG. 2 is a diagram showing a refrigerant circuit of the embodiment of FIG.
【図３】別の実施例の冷媒回路を示す図。FIG. 3 is a diagram showing a refrigerant circuit of another embodiment.
【図４】実施例における冷却運転と除霜運転を示すタイ
ムチャートを示す図。FIG. 4 is a time chart showing a cooling operation and a defrosting operation in the embodiment.
１ 冷凍装置 １０ 凝縮機 １４ 熱交換器 ２４ 圧縮機 ２８ 電磁弁 DESCRIPTION OF SYMBOLS 1 Refrigeration apparatus 10 Condenser 14 Heat exchanger 24 Compressor 28 Solenoid valve
Claims (1)
く除霜回路を設け、この回路には開閉弁を備える冷凍装
置において、冷却運転から除霜運転に切り換わる時に、
上記除霜回路中の開閉弁を開くとともに、この開閉弁を
開いた時点から一定時間遅らせて上記圧縮機を起動する
制御装置を備えることを特徴とする冷凍装置。A defrost circuit for guiding hot gas from a compressor to a heat exchanger is provided. This circuit includes a refrigerating device having an on-off valve, when switching from a cooling operation to a defrost operation.
Open the on-off valve in the above defrost circuit, and open this on-off valve.
Start the compressor after a certain time delay from the time of opening
A refrigeration device comprising a control device .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26813793A JP3342130B2 (en) | 1993-09-30 | 1993-09-30 | Refrigeration equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26813793A JP3342130B2 (en) | 1993-09-30 | 1993-09-30 | Refrigeration equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07103624A JPH07103624A (en) | 1995-04-18 |
| JP3342130B2 true JP3342130B2 (en) | 2002-11-05 |
Family
ID=17454415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26813793A Expired - Fee Related JP3342130B2 (en) | 1993-09-30 | 1993-09-30 | Refrigeration equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3342130B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11125449B2 (en) | 2019-03-20 | 2021-09-21 | Johnson Controls Technology Company | Systems and methods for transitioning between a cooling operating mode and a reheat operating mode |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6043497B2 (en) * | 2012-04-06 | 2016-12-14 | ホシザキ株式会社 | How to operate an automatic ice machine |
-
1993
- 1993-09-30 JP JP26813793A patent/JP3342130B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11125449B2 (en) | 2019-03-20 | 2021-09-21 | Johnson Controls Technology Company | Systems and methods for transitioning between a cooling operating mode and a reheat operating mode |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07103624A (en) | 1995-04-18 |
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