JPH04148169A - Controller for refrigerator - Google Patents
Controller for refrigeratorInfo
- Publication number
- JPH04148169A JPH04148169A JP27124490A JP27124490A JPH04148169A JP H04148169 A JPH04148169 A JP H04148169A JP 27124490 A JP27124490 A JP 27124490A JP 27124490 A JP27124490 A JP 27124490A JP H04148169 A JPH04148169 A JP H04148169A
- Authority
- JP
- Japan
- Prior art keywords
- compressor
- defrosting
- refrigerator
- timer
- switch
- 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
Links
- 239000003507 refrigerant Substances 0.000 claims abstract description 40
- 238000010257 thawing Methods 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 238000005057 refrigeration Methods 0.000 claims description 8
- 238000005086 pumping Methods 0.000 claims description 5
- 230000005856 abnormality Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 abstract description 14
- 230000001681 protective effect Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 238000005338 heat storage Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Defrosting Systems (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は冷凍サイクルを有して冷凍庫や冷蔵庫内を冷却
する冷凍機の制御装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a control device for a refrigerator that has a refrigeration cycle and cools the inside of a freezer or refrigerator.
（ロ）従来の技術
一般にこのような冷凍機の従来技術としては、実公昭５
８−５１５７５号公報に記載されているようなものがあ
った。この公報に記載きれたものは、蒸発器の除霜運転
時に圧縮機から吐出された液冷媒を凝縮器をバイパスさ
せて直接蒸発器へ導入して、冷媒の凝縮熱で蒸発器の賞
を溶かすようにしたものであった。(b) Conventional technology In general, the conventional technology for such refrigerators is
There was one described in Japanese Patent No. 8-51575. What is described in this bulletin is that the liquid refrigerant discharged from the compressor during defrosting operation of the evaporator is introduced directly into the evaporator bypassing the condenser, and the heat of condensation of the refrigerant melts the evaporator. It was done like this.
（ハ）発明が解決しようとする課題
最近はスクロール圧縮機やロークリ圧縮機に冷媒（Ｒ２
２）を用いて低温から高温まで冷却する冷凍機の開発が
行なわれて来た。このため、圧縮機自体の温度、又は吐
出冷媒の温度を下げるために液冷媒を用いたリキッドイ
ンジェクション方式が採用されて来た。また、圧縮機の
電動機巻線の冷却にファンを用いた方式からこのリキ・
メトインジェクションによる冷却に変える動きも見られ
る。(c) Problems to be solved by the invention Recently, refrigerant (R2
2) has been used to develop refrigerators that can cool from low to high temperatures. For this reason, a liquid injection method using liquid refrigerant has been adopted in order to lower the temperature of the compressor itself or the temperature of the discharged refrigerant. In addition, the system using a fan to cool the motor windings of the compressor has led to this
There is also a movement to switch to cooling using met injection.
このリキッドインジェクション方式にて圧縮機の冷却を
行なう場合は、液冷媒が必要であり、この液冷媒が不足
した時には圧縮機各部の温度が上昇し保護スイッチが作
動するものであった。When cooling a compressor using this liquid injection method, a liquid refrigerant is required, and when this liquid refrigerant becomes insufficient, the temperature of each part of the compressor rises and a protection switch is activated.
前記従来の技術に示したような除霜方式を用Ｉ／＼た冷
凍機に、このリキッドインジェクション方式を採用した
場合に、前記した除霜運転を行なうと、この除霜運転中
に圧縮機を冷却するための液冷媒がなくなる可能性が高
く保護スイ・７チが作動することがあった。この保護ス
イ・ンチが復帰するまでの間に、除霜タイマの計時が進
み除霜運転が終了し冷却運転になっていると、保護スイ
・ンチの復帰時に蒸発器に溜っている液冷媒が圧縮機へ
吸込まれて圧縮機が液圧縮を行ない圧縮機が故障するこ
とかあった。When this liquid injection method is adopted for a refrigerator that uses the defrosting method as shown in the prior art, when the above-mentioned defrosting operation is performed, the compressor may be turned off during the defrosting operation. There was a high possibility that the liquid refrigerant for cooling would run out, and the protection switch 7 would be activated. If the defrost timer continues to count until the protection switch is reset and the defrost operation has ended and the cooling operation has started, the liquid refrigerant accumulated in the evaporator will drain when the protection switch returns. In some cases, the liquid was sucked into the compressor and the compressor compressed the liquid, causing the compressor to malfunction.
このような問題点に対して、本発明は除霜運転中に圧縮
機が異常停止しても、圧縮機の再始動時に圧縮機が液圧
縮を行なわないように成した冷凍機の制御装置を提供す
るものである。In order to solve these problems, the present invention provides a refrigerating machine control device that prevents the compressor from compressing liquid when restarting the compressor even if the compressor stops abnormally during defrosting operation. This is what we provide.
（ニ）課題を解決するための手段
本発明の制御装置は圧縮機、凝縮器、膨張弁、蒸発器を
冷媒配管で環状に接続して冷凍サイクルを構成すると共
に、除霜信号に応答して圧縮機から吐出された液冷媒を
前記凝縮器をバイパスして前記蒸発器へ導く冷媒回路を
備えた冷凍機において、この冷凍機は前記液冷媒を圧縮
機へ戻すリキッドインジェクション回路を備え、この冷
凍機の制御装置は所定時間毎に一定時間の間前記除霜信
号を出力する除霜タイマと、圧縮機の異常時に圧縮機の
運転を停止させる保護スイッチと、除霜信号が出力され
ている際に保護スイッチが作動した時には除霜タイマの
計時を停止させる制御部とを備えたものである。(d) Means for Solving the Problems The control device of the present invention connects a compressor, a condenser, an expansion valve, and an evaporator in a ring with refrigerant piping to form a refrigeration cycle, and also responds to a defrosting signal. The refrigerator includes a refrigerant circuit that leads liquid refrigerant discharged from the compressor to the evaporator bypassing the condenser. The control device of the machine includes a defrost timer that outputs the defrost signal for a certain period of time at predetermined intervals, a protection switch that stops the operation of the compressor in the event of an abnormality in the compressor, and a protection switch that stops the operation of the compressor when the defrost signal is output. and a control section that stops the defrosting timer when the protection switch is activated.
また本発明の制御装置は冷凍機の制御装置は、さらに除
霜運転の終りに圧縮機をポンプダウン停止させる停止制
御部と、このポンプダウン停止中に保護スイッチが作動
した後の圧縮機の再起動をポンプダウン運転から行なう
運転制御部とを備えたものである。In addition, the control device of the present invention further includes a stop control section that stops pumping down the compressor at the end of the defrosting operation, and a stop control section that stops pumping down the compressor at the end of the defrosting operation, and restarting the compressor after the protection switch is activated during the pump down stop. The pump is equipped with an operation control section that starts the pump-down operation.
（ホ）作用
本発明の冷凍機の制御装置は、除霜運転時に保護スイッ
チが作動した際は、除霜タイマの計時を停止し、保護ス
イッチの復帰時にも除霜運転が継続して行なえるもので
ある。(E) Function The refrigerator control device of the present invention can stop the defrost timer from counting when the protection switch is activated during defrosting operation, and can continue defrosting operation even when the protection switch returns. It is something.
（へ）実施例 以下本発明の実施例を図面に基づいて説明する。(f) Example Embodiments of the present invention will be described below based on the drawings.
第１図は冷媒回路図であり、図中１は圧縮機、２は凝縮
器、３３はレシーバタンク、３は膨張弁、４は蒸発器、
３４はアキュムレータであり、これらを順次冷媒配管で
接続して冷凍サイクルを構成している。５は前記冷凍サ
イクルに挿入された除霜用の冷媒回路で、該回路は圧縮
機１と凝縮器２との間の配管６，７に接続する接続配管
端部８．９とを有する加熱用熱交換器１０と蒸発器４と
圧縮機１との間の配管１１．１２に接続する接続配管端
部１３，１４とを有する吸熱用熱交換器１５とを夫々熱
交換的に接続した蓄熱槽１６と、前記吸熱用熱交換器１
５に直列に設けた吸入圧力調整弁１７と、該吸入調整弁
と吸熱用熱交換器１５とに並列に設けた電磁弁１８を有
する短絡管１９と、前記凝縮器２に並列に入口側に三方
切換電磁弁２０を出口側にエジェクター接続部２１を設
は膨張弁３に接続する接続配管端部２２を有するホット
ガスバイパス管２３と、前記エジェクター接続部２１に
接続する逆止弁２５とを介してレシーバタンク３３の出
口側配管２６に接続する接続配管端部２７と、前記三方
切換電磁弁２０と凝縮器２との間と蒸発器４の出口側と
を接続する電磁弁２Ｂを有する冷媒回収管２９とからな
っている。また、３５は吸入圧力調整弁１７と直列に接
続された電磁弁、３６はドライコア、３７はモイスチャ
ーインジケータ、３８は電磁弁、３９はファンである。Figure 1 is a refrigerant circuit diagram, in which 1 is a compressor, 2 is a condenser, 33 is a receiver tank, 3 is an expansion valve, 4 is an evaporator,
34 is an accumulator, and these are successively connected by refrigerant piping to constitute a refrigeration cycle. Reference numeral 5 denotes a defrosting refrigerant circuit inserted into the refrigeration cycle, and the circuit has a connecting pipe end 8.9 connected to the pipes 6 and 7 between the compressor 1 and the condenser 2. A heat storage tank in which a heat exchanger 10 and an endothermic heat exchanger 15 having connecting pipe ends 13 and 14 connected to pipes 11 and 12 between the evaporator 4 and the compressor 1 are respectively connected in a heat exchange manner. 16, and the endothermic heat exchanger 1
5, a short-circuit pipe 19 having a solenoid valve 18 provided in parallel with the suction adjustment valve and the endothermic heat exchanger 15, and a short-circuit pipe 19 on the inlet side in parallel with the condenser 2. An ejector connection part 21 is provided on the outlet side of the three-way switching solenoid valve 20, and a hot gas bypass pipe 23 having a connection pipe end 22 connected to the expansion valve 3 and a check valve 25 connected to the ejector connection part 21 are provided. A refrigerant having a connecting pipe end 27 that connects to the outlet side pipe 26 of the receiver tank 33 through the refrigerant, and a solenoid valve 2B that connects between the three-way switching solenoid valve 20 and the condenser 2 and the outlet side of the evaporator 4. It consists of a recovery pipe 29. Further, 35 is a solenoid valve connected in series with the suction pressure regulating valve 17, 36 is a dry core, 37 is a moisture indicator, 38 is a solenoid valve, and 39 is a fan.
４０はリキッドインジエクション回路であり、液冷媒を
圧縮機へ戻し、この液冷媒の気化作用で圧縮機１の冷却
を行なうものである。４１は電磁弁である。A liquid injection circuit 40 returns liquid refrigerant to the compressor and cools the compressor 1 by vaporizing the liquid refrigerant. 41 is a solenoid valve.
このように構成された冷凍サイクルは、■通常の冷却運
転時には、電磁弁３８−開、電磁弁３２−閉、電磁弁２
８−閉、電磁弁１８−間、電磁弁３５→閉、三方切換を
磁弁２０がＡ→Ｃになって実線矢印のように冷媒が流れ
蒸発器４で冷却運転が行なわれる。■除霜運転時には電
磁弁３８→開、電磁弁３２→開、を磁弁２８→開、電磁
弁１８→閉、電磁弁３５→開、三方切換電磁弁２０がＡ
−Ｂになって点線矢印のように液冷媒が蒸発器４に流れ
除霜が行なわれる。この時、蒸発器４で放熱した冷媒は
蓄熱槽１６から吸熱を行なった後アキュムレータ３４へ
流れる。さらにこの時、ニジエフターによりレシーバ−
タンク３３内の液冷媒も蒸発器４の除霜に用いられるも
のである。■除霜運転後の蒸発器４の水切運転時には電
磁弁３８→閉、電磁弁３２→閉、電磁弁２８→閉、電磁
弁１８→閉、電磁弁３５−開、三方切換電磁弁２０がＡ
→Ｃになって蒸発器４へは冷媒が流れなくなる。尚、電
磁弁３５は開いているので蒸発器４に溜っている液冷媒
は蓄熱槽１６で吸熱を行ないアキュムレータ３４に至る
ものです。In the refrigeration cycle configured in this way, during normal cooling operation, the solenoid valve 38 is open, the solenoid valve 32 is closed, and the solenoid valve 2 is closed.
8-closed, solenoid valve 18-, solenoid valve 35->closed, and the three-way switching is made so that the solenoid valve 20 changes from A to C, and the refrigerant flows as shown by the solid arrow, and cooling operation is performed in the evaporator 4. ■ During defrosting operation, solenoid valve 38 → open, solenoid valve 32 → open, solenoid valve 28 → open, solenoid valve 18 → close, solenoid valve 35 → open, three-way switching solenoid valve 20 is A
-B, the liquid refrigerant flows to the evaporator 4 as indicated by the dotted arrow and defrosts the air. At this time, the refrigerant that has radiated heat in the evaporator 4 absorbs heat from the heat storage tank 16 and then flows to the accumulator 34 . Furthermore, at this time, the receiver is
The liquid refrigerant in the tank 33 is also used to defrost the evaporator 4. ■When draining the evaporator 4 after defrosting operation, the solenoid valve 38 → close, solenoid valve 32 → close, solenoid valve 28 → close, solenoid valve 18 → close, solenoid valve 35 - open, three-way switching solenoid valve 20 is A
→C, and the refrigerant no longer flows to the evaporator 4. Since the solenoid valve 35 is open, the liquid refrigerant accumulated in the evaporator 4 absorbs heat in the heat storage tank 16 and reaches the accumulator 34.
第２図は第１図に示した圧縮機の運転／停止や電磁弁の
開閉を切換えるための電気回路図である。この図におい
て、圧縮ｊａ１は補助リレーの接片を介して通電／停止
が制御きれているが、第２図ではこの補助リレーを圧縮
機１に置換えて説明する。第１図に示した電磁弁、三方
切換電磁弁についても同様に置換えて説明する。５１．
５２は電流ヒユーズ、５３．５４は連動して開閉する運
転スイッチ、５５は冷却運転表示ランプ、５６は霜取運
転表示ランプであり、このランプ５６には電磁弁３５と
ドレンパン及びファンガード用の電気ヒータとが並列に
接続されている。これらのランプ５５，５６の点灯切換
えは、補助リレー５９の切換接片５８によって行なわれ
る。図に示す状態は補助リレー５９の非通電状態である
。以下図に示す接片は全てリレーが非通電状態のもので
ある。６０．６１は庫内（冷却負荷）の温度に基づいて
接片が切換るサーモスタットであり、図に示した状態は
庫内温度が設定値より低い状態のものである。尚、電磁
弁３８は２分割されており、両方が通電された時に全開
になる。６２．６３は前記した補助リレー５９の常閉接
片、常開接片である。６４は常閉接片であり、補助リレ
ー６５の通電で接片を開く。尚、補助リレー６５は切換
接片６６を有している。６７はタイマ接片であり、タイ
マリレー６８を通電してから約６分後に接片を閉じるも
のである。６９は切換接片であり、除霜タイマ７０によ
って所定周期毎に一定時間の間接片が切換るものである
。７１は切換接片６９の除重運転側に接続された補助リ
レーであり、常閉接片７２を有している。７３は除霜運
転復帰用のサーモスタットであり、蒸発器４の除霜が終
了すると接片を閉じるものである。７４は常開接片であ
り、補助リレー７５の通電で接片を閉じる。FIG. 2 is an electrical circuit diagram for switching the operation/stop of the compressor and the opening/closing of the solenoid valve shown in FIG. 1. In this figure, energization/stopping of the compressor ja1 can be controlled through a contact piece of an auxiliary relay, but in FIG. 2, this auxiliary relay will be replaced with the compressor 1 for explanation. The solenoid valve shown in FIG. 1 and the three-way switching solenoid valve will be similarly replaced and explained. 51.
52 is a current fuse, 53 and 54 are operation switches that open and close in conjunction with each other, 55 is a cooling operation display lamp, and 56 is a defrost operation display lamp. The heater is connected in parallel. Switching on and off of these lamps 55 and 56 is performed by a switching contact piece 58 of an auxiliary relay 59. The state shown in the figure is a non-energized state of the auxiliary relay 59. All of the contacts shown in the figures below are in a non-energized state. 60 and 61 are thermostats whose contact pieces are switched based on the temperature inside the refrigerator (cooling load), and the state shown in the figure is a state where the temperature inside the refrigerator is lower than the set value. The solenoid valve 38 is divided into two parts, and is fully opened when both parts are energized. Reference numerals 62 and 63 are the normally closed contact piece and the normally open contact piece of the auxiliary relay 59 described above. Reference numeral 64 denotes a normally closed contact piece, which opens when energized by an auxiliary relay 65. Note that the auxiliary relay 65 has a switching contact piece 66. Reference numeral 67 is a timer contact, which closes approximately 6 minutes after the timer relay 68 is energized. Reference numeral 69 denotes a switching contact piece, which is switched for a certain period of time by a defrosting timer 70 at predetermined intervals. Reference numeral 71 denotes an auxiliary relay connected to the load removal operation side of the switching contact piece 69, and has a normally closed contact piece 72. Reference numeral 73 is a thermostat for returning to defrosting operation, and the contact piece is closed when defrosting of the evaporator 4 is completed. Reference numeral 74 denotes a normally open contact piece, and the contact piece is closed when the auxiliary relay 75 is energized.
尚、７６は補助リレー７１の常閉接片、７７は補助リレ
ー７５の常開接片である。７８はタイマ接片であり、タ
イマリレー７９を通電し℃から３０秒後に接片を閉じる
ものである。８０は保護スイッチであり、圧縮機の吐出
ガス温度が高くなった時あるいは圧縮機の巻線温度が高
くなった時に接片を開くものである。８１はインターナ
ルサーモであり圧縮機内の巻線中に埋め込まれて、この
巻線の温度が高くなった時に接片を開くものである。８
２はサーマルリレーであり、圧縮機のケース温度が高く
なった時に接片を開くものである。Note that 76 is a normally closed contact piece of the auxiliary relay 71, and 77 is a normally open contact piece of the auxiliary relay 75. Reference numeral 78 denotes a timer contact, which closes the timer relay 79 30 seconds after the timer relay 79 is energized. 80 is a protection switch, which opens a contact piece when the discharge gas temperature of the compressor becomes high or when the winding temperature of the compressor becomes high. Reference numeral 81 denotes an internal thermostat which is embedded in the windings in the compressor and opens its contacts when the temperature of the windings becomes high. 8
2 is a thermal relay, which opens the contact piece when the compressor case temperature becomes high.
８３は高圧スイッチであり、冷凍サイクルの高圧側の圧
力が高くなった時に接片を開くものである。８４は低圧
スイッチであり、冷凍サイクルの低圧側の圧力が低くな
った時に接片を開くものである。８５はインジェクショ
ン制御用の温度検知器であり、圧縮機の温度がインジェ
クションを必要とする温度以上になった時に接片を閉じ
るものである。83 is a high pressure switch, which opens a contact piece when the pressure on the high pressure side of the refrigeration cycle becomes high. 84 is a low pressure switch, which opens a contact piece when the pressure on the low pressure side of the refrigeration cycle becomes low. Reference numeral 85 is a temperature sensor for controlling injection, which closes the contact piece when the temperature of the compressor exceeds a temperature that requires injection.
以上のように構成されたシステムにおいて、通常の冷却
運転中は除霜タイマ７０の接片６９が図に示す状態にあ
り、各電磁弁は前記■の状態になる。この時、保護スイ
ッチ８０の接片が開くと各電磁弁は閉状態になる。従っ
て、液冷媒が蒸発器４へ流入しなくなり、圧縮機の再運
転時に圧縮機への液バツクを防止することができる。In the system configured as described above, during normal cooling operation, the contact piece 69 of the defrosting timer 70 is in the state shown in the figure, and each electromagnetic valve is in the state shown in (2) above. At this time, when the contact piece of the protection switch 80 is opened, each electromagnetic valve is closed. Therefore, liquid refrigerant does not flow into the evaporator 4, and liquid backflow to the compressor can be prevented when the compressor is restarted.
除霜タイマ７０により、接片６９が図示と反対の側に切
換って除霜運転が開始祢れると、各電磁弁は前記■の状
態になって、圧縮機から吐出される液冷媒で蒸発器の除
霜運転が行なわれる。この除霜運転中に保護スイッチ８
０の接片が開くと圧縮機の運転が停止すると共に補助リ
レー７１．７５も非通電（ＯＦＦ）になっているため除
霜タイマ７０には電源が供給きれず、除霜タイマ７０の
計時は停止する。保護スイッチ８０が復帰すると補助リ
レー７５が通ｔａれ常開接片７７が閉じて除霜タイマ７
０の計時が再開される。When the defrost timer 70 switches the contact piece 69 to the side opposite to that shown in the figure to start defrosting operation, each electromagnetic valve enters the state (■) above, and the liquid refrigerant discharged from the compressor evaporates. The defrosting operation of the container is performed. During this defrosting operation, the protection switch 8
When the 0 contact opens, the compressor stops operating, and the auxiliary relays 71.75 are also de-energized (OFF), so power cannot be supplied to the defrost timer 70, and the time measurement of the defrost timer 70 stops. Stop. When the protection switch 80 returns, the auxiliary relay 75 is turned on, the normally open contact piece 77 is closed, and the defrost timer 7 is activated.
0 timing is restarted.
この後除霜が終了する（サーモスタット７３の接片が閉
じる）と前記■の水切運転になる。この運転は圧縮機が
ポンプダウンするまで運転し、低圧スイッチ８４の接片
が開くとこのポンプダウン運転を終了し、停止する。タ
イマリレー６８の設定時間（約６分）経過後にタイマ桜
井６７が閉じて冷却運転に切換るものである。この水切
運転中に保護スイッチ８０の接片が開くとタイマーリレ
ー６８への通電が遮断される。保護スイッチ８０の復帰
時にはタイマーリレー６８が再び最初から計時を行なう
ものである。この計時の後冷却運転に切換るものである
。尚、圧縮機のポンプダウン時間は通常２〜３分であり
、負荷は徐々に失くなるので何度も保護スイッチ８０が
作動することはない。After this, when defrosting is completed (the contact piece of the thermostat 73 is closed), the water draining operation described in (2) is started. This operation continues until the compressor pumps down, and when the contact piece of the low pressure switch 84 opens, this pump-down operation is completed and stopped. After the time set by the timer relay 68 (approximately 6 minutes) has elapsed, the timer Sakurai 67 closes to switch to cooling operation. If the contact piece of the protection switch 80 opens during this draining operation, the power to the timer relay 68 is cut off. When the protection switch 80 returns, the timer relay 68 measures time from the beginning again. After this timing, the operation is switched to cooling operation. Incidentally, the pump-down time of the compressor is usually 2 to 3 minutes, and the load is gradually lost, so the protection switch 80 is not activated many times.
（ト）発明の効果
本発明の冷凍機の制御装置は、除霜信号に応答して圧縮
機から吐出された液冷媒を前記凝縮器をバイパスして蒸
発器へ導く冷媒回路を備えた冷凍機において、この冷凍
機は前記液冷媒を圧縮機へ戻すリキッドインジェクショ
ン回路を備え、この冷凍機の制御装置は所定時間毎に一
定時間の間前記除霜信号を出力する除霜タイマと、圧縮
機の異常時に圧縮機の運転を停止させる保護スイッチと
、除霜信号が出力されている際に保護スイッチが作動し
た時には除霜タイマの計時を停止きせる制御部とを備え
たので、除寡運転中にリキッドインジェクションが充分
に行なわれなくなり、保護スイッチが作動した時には除
霜タイマの計時を停止させることができる。従って、保
護スイッチの復帰時は除霜運転から行なわれ、蒸発器に
液冷媒が溜っている状態で冷却運転が行なわれることが
なく、圧縮機の液圧縮を防止することができる。(G) Effects of the Invention The refrigerator control device of the present invention is a refrigerator equipped with a refrigerant circuit that guides liquid refrigerant discharged from the compressor to the evaporator bypassing the condenser in response to a defrosting signal. The refrigerator includes a liquid injection circuit that returns the liquid refrigerant to the compressor, and a control device for the refrigerator includes a defrost timer that outputs the defrost signal for a certain period of time at predetermined intervals, and Equipped with a protection switch that stops compressor operation in the event of an abnormality, and a control unit that stops the defrost timer when the protection switch is activated while a defrost signal is being output, it is possible to stop the compressor during defrost operation. When liquid injection is no longer performed sufficiently and the protection switch is activated, the defrost timer can stop counting. Therefore, the protection switch is reset from the defrosting operation, and the cooling operation is not performed while liquid refrigerant remains in the evaporator, thereby preventing the compressor from compressing the liquid.
第１図は本発明の実施例を示す冷媒回路図、第２図は第
１図に示した冷媒回路に用いる電気回路図である。
１・・・圧縮機、 ２・・・凝縮器、 ３・・・膨張弁
、４・・・蒸発器、 ５・・・除霜用の冷媒回路、 ４
０・・・リキッドインジェクション回路。FIG. 1 is a refrigerant circuit diagram showing an embodiment of the present invention, and FIG. 2 is an electric circuit diagram used in the refrigerant circuit shown in FIG. 1. 1...Compressor, 2...Condenser, 3...Expansion valve, 4...Evaporator, 5...Refrigerant circuit for defrosting, 4
0...Liquid injection circuit.
Claims (2)
状に接続して冷凍サイクルを構成すると共に、除霜信号
に応答して圧縮機から吐出された液冷媒を前記凝縮器を
バイパスして前記蒸発器へ導く冷媒回路を備えた冷凍機
において、この冷凍機は前記液冷媒を圧縮機へ戻すリキ
ッドインジェクション回路を備え、この冷凍機の制御装
置は所定時間毎に一定時間の間前記除霜信号を出力する
除霜タイマと、圧縮機の異常時に圧縮機の運転を停止さ
せる保護スイッチと、除霜信号が出力されている際に保
護スイッチが作動した時には除霜タイマの計時を停止さ
せる制御部とを備えたことを特徴とする冷凍機の制御装
置。(1) A refrigeration cycle is constructed by connecting a compressor, a condenser, an expansion valve, and an evaporator in a ring with refrigerant piping, and the liquid refrigerant discharged from the compressor is passed through the condenser in response to a defrosting signal. In a refrigerator equipped with a refrigerant circuit that bypasses and leads the liquid refrigerant to the evaporator, the refrigerator is equipped with a liquid injection circuit that returns the liquid refrigerant to the compressor, and the controller of this refrigerator A defrost timer that outputs the defrost signal, a protection switch that stops the operation of the compressor in the event of an abnormality in the compressor, and a defrost timer that clocks the defrost timer when the protection switch is activated while the defrost signal is being output. 1. A control device for a refrigerator, comprising: a control section for stopping the refrigerator.
縮機をポンプダウン停止させる停止制御部と、このポン
プダウン停止中に保護スイッチが作動した後の圧縮機の
再起動をポンプダウン運転から行なう運転制御部とを備
えたことを特徴とする特許請求項第１項に記載の冷凍機
の制御装置。(2) The refrigerator control device further includes a stop control unit that stops pumping down the compressor at the end of defrosting operation, and a stop control unit that stops pumping down the compressor and restarting the compressor after a protection switch is activated during this pumping down stop. 2. The refrigerator control device according to claim 1, further comprising an operation control unit that controls the operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27124490A JP2858914B2 (en) | 1990-10-08 | 1990-10-08 | Refrigerator control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27124490A JP2858914B2 (en) | 1990-10-08 | 1990-10-08 | Refrigerator control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04148169A true JPH04148169A (en) | 1992-05-21 |
| JP2858914B2 JP2858914B2 (en) | 1999-02-17 |
Family
ID=17497371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27124490A Expired - Fee Related JP2858914B2 (en) | 1990-10-08 | 1990-10-08 | Refrigerator control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2858914B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011237095A (en) * | 2010-05-10 | 2011-11-24 | Fujitsu General Ltd | Air conditioner |
-
1990
- 1990-10-08 JP JP27124490A patent/JP2858914B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011237095A (en) * | 2010-05-10 | 2011-11-24 | Fujitsu General Ltd | Air conditioner |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2858914B2 (en) | 1999-02-17 |
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| LAPS | Cancellation because of no payment of annual fees |