JPH0654186B2 - Refrigeration equipment - Google Patents
Refrigeration equipmentInfo
- Publication number
- JPH0654186B2 JPH0654186B2 JP60259301A JP25930185A JPH0654186B2 JP H0654186 B2 JPH0654186 B2 JP H0654186B2 JP 60259301 A JP60259301 A JP 60259301A JP 25930185 A JP25930185 A JP 25930185A JP H0654186 B2 JPH0654186 B2 JP H0654186B2
- Authority
- JP
- Japan
- Prior art keywords
- compressor
- lubricating oil
- refrigerant
- oil recovery
- pressure
- 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 - Lifetime
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- Air Conditioning Control Device (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Description
【発明の詳細な説明】 (産業上の利用分野) 本発明は、容量可変の圧縮機を備え、その圧縮機を低容
量運転時に定期的に高容量側に切り換えて冷媒サイクル
中の圧縮機潤滑油を回収するようにした冷凍装置に関す
る。Description: TECHNICAL FIELD The present invention includes a compressor having a variable capacity, and the compressor is lubricated during a refrigerant cycle by periodically switching to a high capacity side during low capacity operation. The present invention relates to a refrigerating device for recovering oil.
(従来の技術) 一般に、この種の容量可変型の圧縮機を備えた冷凍装置
においては、圧縮機を低容量運転させると、冷媒サイク
ル中の冷媒循環量が減少するため、潤滑油が圧縮機に戻
り難くなり、この状態で圧縮機の低容量運転を長時間に
亘って継続すると、圧縮機の潤滑油不足によりその焼付
き等を生じることがある。(Prior Art) Generally, in a refrigerating apparatus including a variable-capacity compressor of this type, when the compressor is operated at a low capacity, the amount of refrigerant circulation during the refrigerant cycle decreases, so that the lubricating oil is compressed by the compressor. If the compressor continues to operate at low capacity for a long time in this state, seizure or the like may occur due to lack of lubricating oil in the compressor.
このため、従来、例えば特公昭44−3932号公報に
開示されているように、圧縮機の低容量運転が一定時間
継続されると、強制的に圧縮機を一定時間だけ高容量運
転に切り換えていわゆる潤滑油回収運転を行わせること
により、冷媒サイクル中の冷媒の流速を高めて冷媒サイ
クル中に残存している潤滑油を圧縮機に回収するように
したものが提案されている。そして、上記潤滑油回収の
ための運転時間は、潤滑油を確実に回収するために長目
に設定されている。For this reason, conventionally, for example, as disclosed in Japanese Examined Patent Publication No. 44-3932, when the low capacity operation of the compressor is continued for a certain period of time, the compressor is forcibly switched to the high capacity operation for a certain period of time. It has been proposed to perform a so-called lubricating oil recovery operation to increase the flow rate of the refrigerant in the refrigerant cycle and recover the lubricating oil remaining in the refrigerant cycle in the compressor. The operating time for recovering the lubricating oil is set long in order to reliably recover the lubricating oil.
(発明が解決しようとする問題点) しかし、このように潤滑油回収のための高容量運転を一
定時間行うように制御する場合、その運転の途中で潤滑
油の回収が十分に行われることがある。このときには、
潤滑油の回収が実質的に終了したにも拘らず、さらに高
容量運転が継続することとなり、この運転は無駄にな
る。(Problems to be Solved by the Invention) However, when controlling the high-capacity operation for lubricating oil recovery to be performed for a certain period of time as described above, the lubricating oil may be sufficiently recovered during the operation. is there. At this time,
Even though the recovery of the lubricating oil is substantially completed, the high capacity operation will be continued and this operation will be wasted.
また、潤滑油回収運転時は、本来は低負荷状態であるに
も拘らず、高容量運転が行われるので、それが長時間継
続されると、圧縮機からの吐出冷媒圧が異常に上昇する
ことになり、このため、圧縮機保護のための高圧圧力開
閉器等の安全装置が作動して、不必要に運転が停止し、
冷凍装置を継続して作動し得ないという問題もある。Further, during the lubricating oil recovery operation, high capacity operation is performed despite the low load condition originally, so if it continues for a long time, the refrigerant pressure discharged from the compressor rises abnormally. As a result, safety devices such as high-pressure pressure switches for protecting the compressor are activated and operation stops unnecessarily,
There is also a problem that the refrigeration system cannot be operated continuously.
本発明は斯かる諸点に鑑みてなされたもので、その目的
とするところは、圧縮機の低負荷時に行われる潤滑油回
収運転を時間のみならず冷媒の吐出圧にも関連して制御
するようにすることにより、潤滑油の回収運転を必要な
時間だけ行わせるようにして、無駄な潤滑油回収運転を
回避し、省エネルギー効果を高めようとすることにあ
る。The present invention has been made in view of these points, and an object of the present invention is to control a lubricating oil recovery operation performed at a low load of a compressor in relation to not only time but also refrigerant discharge pressure. By doing so, the lubricating oil recovery operation is performed only for a required time to avoid wasteful lubricating oil recovery operation and to improve the energy saving effect.
(問題点を解決するための手段) 上記の目的を達成すべく、本発明による解決手段は、第
1図に示すように、容量可変の圧縮機(1)を備えた冷
凍装置に対し、上記圧縮機(1)の低容量運転時間を積
算する運転時間積算手段(33)と、該積算手段(3
3)により積算された運転時間が所定時間以上に達する
と、冷媒サイクル(18)中の圧縮機用潤滑油を回収す
るよう圧縮機(1)を一定時間高容量運転させる潤滑油
回収運転制御手段(34)とを設ける。さらに、圧縮機
(1)から吐出された冷媒の圧力が所定圧以上に上昇し
たことを検出する圧力上昇検出手段(PS2)と、上記
潤滑油回収運転制御手段(34)により圧縮機(1)が
潤滑油回収のために高容量運転されているときに、上記
圧力上昇検出手段(PS2)の出力を受けると、圧縮機
(1)の高容量運転を強制的に終了させる潤滑油回収運
転停止手段(35)とを設ける。(Means for Solving the Problems) In order to achieve the above object, the solution means according to the present invention is, as shown in FIG. 1, provided with respect to a refrigerating apparatus including a variable capacity compressor (1). An operating time accumulating means (33) for accumulating the low capacity operating time of the compressor (1), and the accumulating means (3)
Lubricant recovery operation control means for operating the compressor (1) in a high capacity for a certain time so as to recover the compressor lubricating oil in the refrigerant cycle (18) when the operating time accumulated by 3) reaches a predetermined time or more. (34) and are provided. Further, the pressure increase detection means (PS2) for detecting that the pressure of the refrigerant discharged from the compressor (1) rises above a predetermined pressure, and the lubricating oil recovery operation control means (34), the compressor (1). When the output of the pressure rise detection means (PS2) is received while the engine is operating at high capacity for lubricating oil recovery, the lubricating oil recovery operation is stopped to forcibly terminate the high capacity operation of the compressor (1). Means (35) are provided.
(作用) 以上の構成により、本発明では、圧縮機(1)の低容量
運転が行われると、その運転時間が運転時間積算手段
(33)によって積算され、その積算値が所定時間以上
になると、潤滑油回収運転制御手段(34)により圧縮
機(1)が強制的に一定時間だけ高容量運転に切り換え
られて潤滑油回収運転が行われ、この圧縮機(1)の高
容量運転により冷媒サイクル(18)中の潤滑油が圧縮
機(1)に回収される。そして、この潤滑油回収のため
の高容量運転中、圧縮機(1)から吐出された冷媒が所
定圧以上へ上昇したか否かが圧力上昇検出手段(PS
2)により判定され、圧力上昇検出手段(PS2)が検
出動作したとき、つまり上記冷媒の吐出圧が所定値以上
に上昇したときには、冷媒の循環量が増加して循環速度
も増大し、結果として潤滑油が十分に圧縮機(1)に回
収される状態となるので、このときには、検出手段(P
S2)の出力を受けた潤滑油回収運転停止手段(35)
により、上記圧縮機(1)が強制的に高容量運転状態か
ら低容量運転状態に切り換えられて潤滑油回収運転が停
止される。(Operation) With the above configuration, in the present invention, when the low capacity operation of the compressor (1) is performed, the operating time is integrated by the operating time integration means (33), and the integrated value becomes equal to or more than the predetermined time. The lubricating oil recovery operation control means (34) forcibly switches the compressor (1) to a high-capacity operation for a fixed time to perform a lubricating oil recovery operation, and the high-capacity operation of the compressor (1) causes the refrigerant to flow. The lubricating oil in the cycle (18) is recovered by the compressor (1). Then, during the high-capacity operation for recovering the lubricating oil, it is determined whether or not the refrigerant discharged from the compressor (1) has risen to a predetermined pressure or higher.
2), when the pressure rise detection means (PS2) performs a detection operation, that is, when the discharge pressure of the refrigerant rises above a predetermined value, the circulation amount of the refrigerant increases and the circulation speed also increases. Since the lubricating oil is sufficiently recovered by the compressor (1), the detecting means (P
Lubricating oil recovery operation stopping means (35) that received the output of S2)
As a result, the compressor (1) is forcibly switched from the high capacity operation state to the low capacity operation state, and the lubricating oil recovery operation is stopped.
したがって、このように、圧縮機(1)の低負荷時に行
われる潤滑油回収のための高容量運転が冷媒吐出圧の上
昇に伴って停止されるので、潤滑油の回収が既に十分に
行われているにも拘らず、圧縮機(1)が依然として高
容量運転される無駄がなく、省エネルギー効果を得るこ
とができる。しかも、潤滑油回収運転中に安全装置が作
動して冷凍装置が停止することもない。Therefore, since the high-capacity operation for recovering the lubricating oil, which is performed when the compressor (1) has a low load, is stopped as the refrigerant discharge pressure increases, the lubricating oil is already sufficiently recovered. In spite of this, the compressor (1) is not wastefully operated at a high capacity, and the energy saving effect can be obtained. In addition, the safety device does not operate and the refrigeration system does not stop during the lubricating oil recovery operation.
(実施例) 以下、本発明を空気調和機に適用した実施例を第2図以
下の図面に基づいて説明する。(Example) Hereinafter, an example in which the present invention is applied to an air conditioner will be described with reference to the drawings starting from FIG.
第2図は高層ビル等に配置されるマルチ型式の空気調和
機の冷媒配管系統を示し、(X)は室外ユニット、
(Y),(Y′)は各々所定階の一室に配置された室内
ユニット、(Z)は同様に所定階の一室に配置された室
内ユニットであって、上室室外ユニット(X)の内部に
は、後述の三方電磁弁(19)によって容量を高低の2
段階に切換可能の圧縮機(1)と、冷房運転時に図中実
線の如く切換わり暖房運転時に図中破線の如く切換わる
四路切換弁(2)と、室外送風ファン(3a)を有する
室外熱交換器(3)と、暖房運転時に蒸発器として作用
する室外熱交換器(3)の蒸発温度を感温筒(4a)で
感温して絞り程度を調整する暖房用膨張弁(4)と、ア
キュムレータ(5)とが主要機器として内蔵されてい
て、該各機器(1)〜(5)は各々冷媒配管(8)で冷
媒の流通可能に接続されている。FIG. 2 shows a refrigerant piping system of a multi-type air conditioner arranged in a high-rise building or the like, (X) is an outdoor unit,
(Y) and (Y ') are indoor units arranged in one room on the predetermined floor, and (Z) is an indoor unit similarly arranged in one room on the predetermined floor, and is an upper outdoor unit (X). The capacity of the inside of the
An outdoor having a compressor (1) that can be switched to a stage, a four-way switching valve (2) that switches as shown by the solid line in the figure during cooling operation, and switches as the broken line in the figure during heating operation, and an outdoor blower fan (3a) An expansion valve for heating (4) for adjusting the degree of throttling by sensing the evaporation temperature of the heat exchanger (3) and the outdoor heat exchanger (3) acting as an evaporator during heating operation by the temperature sensing tube (4a). And an accumulator (5) are built-in as main equipment, and the respective equipments (1) to (5) are connected by a refrigerant pipe (8) so that the refrigerant can flow.
一方、3台の室内ユニット(Y)〜(Z)は同一構成で
あり、その内部には第3図に示す如く、二台の熱交換器
(10a),(10b)が互いに並列に接続され且つ1
台の室内送風ファン(10c)を有する室内熱交換器
(10)と、冷房用キャピラリーチューブ(11)と、
冷房運転時に該キャピラリーチューブ(11)の絞り開
度を補正すると共に双方電磁弁として機能する電動弁
(12)とが内蔵されていて、該各機器(10)〜(1
2)は各々冷媒配管(15)で冷媒の流通可能に連結さ
れている。そして、同一階の二室に配置される室内ユニ
ット(Y),(Y′)および(Z)はそれぞれ冷媒配管
(16),(16′)により上記1台の室外ユニット
(X)に対して並列に接続されている。而して、暖房運
転時には、圧縮機(1)からの冷媒を四路切換弁(2)
の切換えにより第2図および第3図破線矢印で示す如く
循環させることにより、室外熱交換器(3)で外気から
吸熱した熱量を各室内ユニット(Y)〜(Z)の室内熱
交換器(10)で室内空気に放熱することを繰返して、
所定階の二室を同時に暖房する一方、冷房運転時には、
圧縮機(1)からの冷媒を第2図および第3図実線矢印
で示す如く循環させることにより、冷媒循環サイクルを
上記とは逆サイクルとして、所定階の二室を同時に冷房
するようにした冷媒サイクル(18)が構成されてい
る。On the other hand, the three indoor units (Y) to (Z) have the same structure, and inside thereof, two heat exchangers (10a) and (10b) are connected in parallel with each other, as shown in FIG. And 1
An indoor heat exchanger (10) having a single indoor blower fan (10c), a cooling capillary tube (11),
Each of the devices (10) to (1) has a built-in electric valve (12) that corrects the throttle opening of the capillary tube (11) during the cooling operation and also functions as a solenoid valve.
2) are connected to each other through a refrigerant pipe (15) so that the refrigerant can flow. The indoor units (Y), (Y ') and (Z) arranged in the two rooms on the same floor are connected to the one outdoor unit (X) by the refrigerant pipes (16) and (16'), respectively. It is connected in parallel. Thus, during the heating operation, the refrigerant from the compressor (1) is supplied with the four-way switching valve (2).
2 and 3 are circulated as indicated by broken line arrows to switch the heat quantity absorbed from the outside air in the outdoor heat exchanger (3) to the indoor heat exchangers (Y) to (Z) of the indoor units (Y) to (Z). Repeatedly radiating heat to indoor air in 10),
While heating two rooms on the specified floor at the same time, during cooling operation,
Refrigerant from the compressor (1) is circulated as shown by solid line arrows in FIG. 2 and FIG. 3 so that the refrigerant circulation cycle is a reverse cycle to the one described above so that the two chambers on the predetermined floor are simultaneously cooled. A cycle (18) is constructed.
そして、上記室外ユニット(X)において、(19)は
圧縮機(1)内部をその吐出側と吸入側とに選択的に連
通切換する三方電磁弁であって、該三方電磁弁(19)
の図中破線で示す吐出側切換時には、圧縮機(1)から
吐出された冷媒の一部を直ちに圧縮機(1)内部にアン
ロードして容量制御運転を行う一方、その実線で示す吸
入側切換時には上記アンロードを停止して、圧縮機
(1)の全容量運転を行うようになされている。Further, in the outdoor unit (X), (19) is a three-way solenoid valve for selectively switching the inside of the compressor (1) between the discharge side and the suction side, the three-way solenoid valve (19).
At the time of switching the discharge side indicated by the broken line in the figure, part of the refrigerant discharged from the compressor (1) is immediately unloaded inside the compressor (1) to perform capacity control operation, while the suction side indicated by the solid line. At the time of switching, the unloading is stopped and the compressor (1) is operated at full capacity.
尚、(20)は受液器であって、該受液器(20)は暖
房用膨張弁(4)を介設した暖房時専用流通路(21)
の該暖房用膨張弁(4)上流側に配置され、該受液器
(20)の直上流および直下流にはそれぞれ暖房運転時
にのみ暖房時専用流通路(21)を開く電磁弁(2
2),(23)が配置されていて、暖房運転時には、室
内ユニットの運転台数の変化等によって生じる余剰冷媒
を受液器(20)に溜込むとともに、冷房運転時には、
該受液器(20)に溜った液冷媒を逆止弁(24)およ
びキャピラリチューブ(25)を介して、四路切換弁
(2)と各室内ユニット(Y)〜(Z)との間の低圧側
に戻すようにしている。また、(30)は圧縮機(1)
からの冷媒中より圧縮機の循環油を分離する油分離器で
あって、分離された循環油はキャピラリチューブ(3
1)を介してアキュムレータ(5)上流側に戻すように
なされている。また、(HPS)は圧縮機(1)保護用
の高圧圧力開閉器、(PS1),(PS2)は圧縮機
(1)から吐出された冷媒の圧力を検出する圧力スイッ
チであって、圧力スイッチ(PS1)は圧力値が所定値
(例えば19kg/cm2)以上でOFF作動するものであ
り、圧力スイッチ(PS2)は圧力値が他の所定値(例
えば24kg/cm2)以上でOFF作動するものであり、
上記圧力スイッチ(PS2)により本発明での圧力検出
手段が構成される。Incidentally, (20) is a liquid receiver, and the liquid receiver (20) is provided with a heating expansion valve (4) and is provided with a heating exclusive flow passage (21).
Of the electromagnetic expansion valve (2) which is disposed upstream of the heating expansion valve (4) and which opens the heating dedicated flow passage (21) only in the heating operation immediately upstream and immediately downstream of the liquid receiver (20).
2) and (23) are arranged, and during the heating operation, excess refrigerant generated due to a change in the number of operating indoor units is accumulated in the liquid receiver (20), and during the cooling operation,
The liquid refrigerant accumulated in the liquid receiver (20) is passed between the four-way switching valve (2) and each indoor unit (Y) to (Z) via the check valve (24) and the capillary tube (25). I am trying to return to the low pressure side. Further, (30) is a compressor (1)
An oil separator that separates the circulating oil of the compressor from the refrigerant from the separated circulating oil.
It is adapted to return to the upstream side of the accumulator (5) via 1). Further, (HPS) is a high-pressure pressure switch for protecting the compressor (1), and (PS1) and (PS2) are pressure switches for detecting the pressure of the refrigerant discharged from the compressor (1). (PS1) is turned off when the pressure value is a predetermined value (for example, 19 kg / cm 2 ) or more, and the pressure switch (PS2) is turned off when the pressure value is another predetermined value (for example, 24 kg / cm 2 ). Is something
The pressure switch (PS2) constitutes pressure detecting means in the present invention.
上記圧縮機(1)の運転容量を制御する三方電磁弁(1
9)は第4図に示すようにCPU等を内蔵した制御回路
(32)により作動制御される。この制御回路(32)
には、各室内ユニット(Y)〜(Z)のリモートコント
ロール装置(図示せず)からの運転制御信号と、上記高
圧圧力開閉器(HPS)および圧力スイッチ(PS
1),(PS2)の各出力信号とが入力されている。A three-way solenoid valve (1 that controls the operating capacity of the compressor (1)
Operation 9) is controlled by a control circuit (32) containing a CPU and the like as shown in FIG. This control circuit (32)
Includes operation control signals from remote control devices (not shown) for the indoor units (Y) to (Z), the high pressure switch (HPS) and the pressure switch (PS).
1) and the output signals of (PS2) are input.
ここで、上記制御回路(32)の作動を第5図に示すフ
ローチャートに基づいて説明する。先ず、ステップS1
で潤滑油回収運転判定フラグAMFがAMF=1か否
か、つまり圧縮機(1)が潤滑油回収のために高容量運
転状態にあるか否かを判定し、判定がAMF=0のNO
のときには、ステップS2に進んで、潤滑油回収運転条
件判定フラグAMF′がAMF′=1か否かを判定して
潤滑油回収運動条件の成立の有無を確認する。この判定
がAMF′=0のNOのときには、ステップS3に進ん
で、圧縮機(1)の運転中は「1」にセットされる圧縮
機運転判定フラグCOFがCOF=1か否かを判定し、
この判定がCOF=1のYESのときには、ステップS
4において、圧縮機(1)の低容量運転中(アンロード
運転中)に「1」にセットされるアンロード運転判定フ
ラグULFがULF=1か否かを判定する。この判定が
ULF=1のYESのときには、ステップS5に進ん
で、アンロード積算タイマTM7をカウント開始させ、
次のステップS6で潤滑油回収運転タイマTM10をリ
セットしたのち、ステップS7で上記アンロード積算タ
イマTM7によって積算された圧縮機(1)の低容量運
転時間が3時間に達したか否かを判定する。この判定が
YESのときには、ステップS8において、上記潤滑油
回収運転条件判定フラグAMF′を「1」にセットし
て、各室内ユニット(Y)〜(Z)に潤滑油回収運転条
件中の成立信号を送った後、ステップS9で上記タイマ
TM7をリセットする。Here, the operation of the control circuit (32) will be described with reference to the flowchart shown in FIG. First, step S 1
Then, it is determined whether the lubricating oil recovery operation determination flag AMF is AMF = 1, that is, whether the compressor (1) is in a high capacity operation state for recovering lubricating oil, and the determination is NO when AMF = 0.
In the case of, the process proceeds to step S 2 and it is determined whether or not the lubricating oil recovery operation condition determination flag AMF ′ is AMF ′ = 1, and it is confirmed whether or not the lubricating oil recovery motion condition is satisfied. When the determination is NO in AMF '= 0, the process proceeds to step S 3, the compressor operation determination flag COF is set to "1" during the operation of the compressor (1) determines whether the COF = 1 Then
If this determination is YES at COF = 1, step S
At 4 , it is determined whether the unloading operation determination flag ULF set to "1" during the low capacity operation (during unloading operation) of the compressor (1) is ULF = 1. When this determination is YES in the ULF = 1, the process proceeds to step S 5, to start counting the unloading integration timer TM7,
After resetting the lubricating oil recovery operation timer TM10 in the next step S 6, whether low displacement operation time of the unload accumulated timer TM7 accumulated by the compressor (1) at step S 7 has reached 3 hours To judge. When this determination is YES, in Step S 8, the lubricating oil collected operating condition determination flag AMF 'is set to "1", the establishment of the lubricating oil recovery operation conditions the indoor units (Y) ~ (Z) after sending a signal to reset the timer TM7 in step S 9.
また、上記ステップS2での判定がAMF′=1のYE
Sのとき、またはステップS3,S7の判定がNOであ
るときには、ステップS14において各室内ユニット
(Y)〜(Z)から例えば室内送風ファン(10c)の
停止等により潤滑油回収許可信号が入力されたか否かを
判定し、この判定がNOのときには次の制御に移るが、
YESのときにはステップS15で上記潤滑油回収運転フ
ラグAMFをAMF=1にセットして、三方電磁弁(1
9)の切換えにより圧縮機(1)を全容量運転させる。Further, the judgment in step S 2 is YE when AMF ′ = 1.
When S, or step S 3, if the determination of S 7 is NO, the lubricating oil recovery permission signal by the stop or the like of the indoor units (Y) ~ for example, from (Z) indoor blower fan (10c) in step S 14 Is input, and if this determination is NO, the process proceeds to the next control.
Set the lubricating oil recovery operation flag AMF to AMF = 1 in step S 15 when YES, the three-way electromagnetic valve (1
By switching 9), the compressor (1) is operated at full capacity.
さらに、上記ステップS4での判定がULF=0のNO
のときには、ステップS10に進んで上記タイマTM10
をカウント開始させたのち、ステップS11でタイマTM
10によるカウント時間が3分に達したか否かを判定す
る。この判定がNOのときには、上記ステップS14に進
む一方、YESのときには、ステップS12,S13でそれ
ぞれタイマTM7,TM10をリセットしたのち次の制
御に進む。Furthermore, the determination in step S 4 is NO when ULF = 0.
If so, the process proceeds to step S 10 and the timer TM10
After starting counting, the timer TM is started in step S 11.
It is determined whether the count time by 10 has reached 3 minutes. By the time this determination is NO, the process proceeds to the step S 14, when the result is YES, the process proceeds to the next control after resetting the timer TM7, TM10, respectively in step S 12, S 13.
一方、上記ステップS1での判定がAMF=1のYES
であるとき、つまり潤滑油回収運転中であるときには、
ステップS16に進んで、高容量運転タイマTM8をカウ
ント開始させ、次のステップS17でそのタイマTM8の
カウント時間が3分経過したか否かを判定する。この判
定がYESのときにはステップS18において上記フラグ
AMFをAMF=0にリセットし、三方電磁弁(19)
の切換えにより圧縮機(1)の全容量運転を停止させて
潤滑油回収運転を終了させるとともに、次のステップS
19で上記タイマTM8をリセットする。On the other hand, the determination in step S 1 is YES when AMF = 1.
, That is, during the lubricating oil recovery operation,
Proceeds to step S 16, the high capacity operation timer TM8 is counting starts, it determines whether or not the count time of the timer TM8 in the next step S 17 is three minutes have elapsed. And resetting the flag AMF the AMF = 0 in step S 18 when the determination is YES, the three-way solenoid valve (19)
The full-capacity operation of the compressor (1) is stopped by switching the operation mode to end the lubricating oil recovery operation, and the next step S
The timer TM8 is reset at 19 .
また、上記ステップS17での判定がNOのときにはステ
ップS20に進んで上記フラグCOFがCOF=1にある
か否かを判定し、この判定がCOF=0のNOのときに
は、ステップS21で上記タイマTM8のカウントをスト
ップさせる。一方、判定がCOF=1のYESのときに
は、ステップS22に進んで、上記圧力検出手段としての
圧力スイッチ(PS2)のON・OFF動作を判定し、
圧力スイッチ(PS2)が吐出冷媒圧の低下(例えば1
9kg/cm2以下)によってON動作しているときにはそ
のまま次の制御に移る一方、冷媒吐出圧の所定圧(24
kg/cm2)以上の上昇により圧力スイッチ(PS2)が
OFF動作しているときには、上記ステップS18,S19
に進んで潤滑油回収運転を終了する。Further, the flag COF proceeds to step S 20 when the determination in the step S 17 is NO, it is determined whether the COF = 1, when the determination is NO in COF = 0, in step S 21 The count of the timer TM8 is stopped. On the other hand, when the determination is COF = 1 is YES, the process proceeds to step S 22, and determines the ON · OFF operation of the pressure switch (PS2) serving as the pressure detecting means,
The pressure switch (PS2) decreases the discharge refrigerant pressure (for example, 1
When the ON operation is performed at 9 kg / cm 2 or less), the control directly shifts to the next control, while the predetermined refrigerant discharge pressure (24
When the pressure switch (PS2) is in the OFF operation due to the increase of kg / cm 2 ) or more, the above steps S 18 and S 19 are performed.
And the lubricating oil recovery operation is completed.
よって、上記の制御フローにおいて、ステップS5によ
り、圧縮機(1)の低容量運転時間を積算するようにし
た運転時間積算手段(33)が構成される。また、ステ
ップS2,S7,S8,S14,S15〜S18により、上記
積算手段(33)により積算された圧縮機(1)の低容
量運転時間が3時間以上に達すると、冷媒サイクル(1
8)中の圧縮機潤滑油を回収するよう圧縮機(1)を一
定時間の3分間だけ高容量運転させるようにした潤滑油
回収運転制御手段(34)が構成される。さらに、ステ
ップ18,S22により、上記潤滑油回収運転制御手段(3
4)により圧縮機(1)が高容量運転されているときに
は、上記圧力スイッチ(PS2)の出力を受けると、圧
縮機(1)の高容量運転を強制的に終了させるようにし
た潤滑油回収運転停止手段(35)が構成される。Therefore, in the above control flow, the step S 5, the operating time integrating means adapted to integrate the low displacement operation time of the compressor (1) (33) is constructed. Further, in step S 2, S 7, S 8 , S 14, S 15 ~S 18, the low displacement operation time of the integrating means (33) by accumulated the compressor (1) reaches over 3 hours, Refrigerant cycle (1
Lubricating oil recovery operation control means (34) is configured so that the compressor (1) is operated at a high capacity for a fixed time of 3 minutes so as to recover the compressor lubricating oil in 8). Further, in steps 18 and S 22 , the lubricating oil recovery operation control means (3
4) When the compressor (1) is operating at high capacity by the above, when the output of the pressure switch (PS2) is received, the recovery of lubricating oil is forced to end the high capacity operation of the compressor (1). An operation stop means (35) is configured.
したがって、上記実施例においては、空気調和機の冷房
あるいは暖房運転中、三方電磁弁(19)の第1図破線
の如き切換えによる圧縮機(1)の低容量運転時の運転
時間が運転時間積算手段(33)により積算され、この
積算値が3時間に達すると、潤滑油回収運転制御手段
(34)により圧縮機(1)が3分間だけ高容量運転さ
れ、このことにより、冷媒サイクル(18)での冷媒循
環量が増大し、その冷媒サイクル(18)に低容量運転
中に溜まっていた潤滑油が冷媒とともに圧縮機(1)に
吸入されて回収される。Therefore, in the above embodiment, during the cooling or heating operation of the air conditioner, the operating time during the low capacity operation of the compressor (1) by switching the three-way solenoid valve (19) as shown by the broken line in FIG. When the integrated value is reached by the means (33) and the integrated value reaches 3 hours, the lubricating oil recovery operation control means (34) operates the compressor (1) at a high capacity for 3 minutes, which causes the refrigerant cycle (18). ), The amount of circulation of the refrigerant increases, and the lubricating oil accumulated during the low capacity operation in the refrigerant cycle (18) is sucked into the compressor (1) together with the refrigerant and recovered.
この潤滑油の回収運転中、圧縮機(1)から吐出される
冷媒の吐出圧が所定圧(24kg/cm2)以上に上昇する
と、そのことを検出した圧力スイッチ(PS2)のOF
F動作に伴って、上記圧縮機(1)の高容量運転が停止
されて圧縮機(1)がもとの低容量運転状態に戻され、
潤滑油回収運転が終了する。When the discharge pressure of the refrigerant discharged from the compressor (1) rises above a predetermined pressure (24 kg / cm 2 ) during the recovery operation of the lubricating oil, the OF of the pressure switch (PS2) that detects this is detected.
With the F operation, the high capacity operation of the compressor (1) is stopped and the compressor (1) is returned to the original low capacity operation state,
The lubricating oil recovery operation ends.
すなわち、潤滑油回収のために圧縮機(1)が高容量運
転されていても、冷媒吐出圧が所定圧(24kg/cm2)
以上に上昇すると、そのときは冷媒サイクル(18)で
の冷媒循環量が増えて冷媒速度も上昇し、それに伴って
圧縮機(1)への潤滑油の回収が十分に行われたと見做
し、この時点で潤滑油回収運転が終了する。このこと
で、それ以降の無駄な高容量運転が不要となり、その
分、省エネルギー効果を高めることができる。That is, even if the compressor (1) is operated at a high capacity for recovering the lubricating oil, the refrigerant discharge pressure is a predetermined pressure (24 kg / cm 2 ).
When it rises above the above, at that time, the refrigerant circulation amount in the refrigerant cycle (18) increases and the refrigerant velocity also increases, and accordingly, it is considered that the recovery of the lubricating oil to the compressor (1) has been sufficiently performed. At this point, the lubricating oil recovery operation ends. As a result, unnecessary high capacity operation thereafter becomes unnecessary, and the energy saving effect can be enhanced accordingly.
また、高圧圧力開閉器(HPS)が作動する前に潤滑油
回収運転が停止されるので、潤滑油回収を良好に行いな
がら、空気調和機を不必要に停止させることなく安定し
て継続させることができる。In addition, since the lubricating oil recovery operation is stopped before the high pressure switch (HPS) is activated, the lubricating oil can be recovered satisfactorily, but the air conditioner can be stably continued without being unnecessarily stopped. You can
尚、上記実施例では、空気調和機に適用した場合を説明
したが、本発明は他の冷凍装置に対しても適用すること
ができるのは言うまでもない。In addition, although the case where the present invention is applied to the air conditioner has been described in the above embodiment, it is needless to say that the present invention can also be applied to other refrigeration systems.
(発明の効果) 以上の如く、本発明によれば、容量可変の圧縮機を備え
た冷凍装置に対し、圧縮機の低容量運転の積算値が所定
時間以上に達すると、圧縮機を一定時間だけ高容量運転
させて冷媒サイクル中の圧縮機潤滑油を回収するととも
に、その潤滑油回収運転中に圧縮機の吐出冷媒圧が所定
圧以上に上昇すると、圧縮機の潤滑油回収運転を強制的
に停止させるようにしたことにより、実質的に潤滑油が
十分に回収された後も引き続いて圧縮機が高容量運転さ
れることはなく、無駄な潤滑油回収運転が不要となり、
省エネルギー効果を高めることができる。(Effects of the Invention) As described above, according to the present invention, when the integrated value of the low-capacity operation of the compressor reaches a predetermined time or more in the refrigerating apparatus including the compressor having a variable capacity, the compressor is operated for a predetermined time. The compressor lubricating oil in the refrigerant cycle is recovered by operating only for a high capacity, and if the compressor discharge refrigerant pressure rises above a predetermined pressure during the lubricating oil recovery operation, the compressor lubricating oil recovery operation is forced. By making it stop at this time, even after the lubricating oil is substantially fully recovered, the compressor will not continue to operate at high capacity, and unnecessary lubricating oil recovery operation becomes unnecessary,
The energy saving effect can be enhanced.
第1図は本発明の構成を示すブロック図である。第2図
ないし第5図は本発明の実施例を示し、第2図は冷媒配
管系統図、第3図は室内ユニットの内部構成を示す冷媒
配管系統図、第4図は制御系のブロック図、第5図は制
御回路の作動を示すフローチャート図である。 (X)……室外ユニット、(Y),(Y′),(Z)…
…室内ユニット、(1)……圧縮機、(18)……冷媒
サイクル、(19)……三方電磁弁、(33)……運転
時間積算手段、(34)……潤滑油回収運転制御手段、
(35)……潤滑油回収運転停止手段。FIG. 1 is a block diagram showing the configuration of the present invention. 2 to 5 show an embodiment of the present invention, FIG. 2 is a refrigerant piping system diagram, FIG. 3 is a refrigerant piping system diagram showing an internal configuration of an indoor unit, and FIG. 4 is a block diagram of a control system. 5 is a flow chart showing the operation of the control circuit. (X) ... Outdoor unit, (Y), (Y '), (Z) ...
... indoor unit, (1) ... compressor, (18) ... refrigerant cycle, (19) ... three-way solenoid valve, (33) ... operating time integrating means, (34) ... lubricating oil recovery operation control means ,
(35) ...... Lubricant oil recovery operation stopping means.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭60−103257(JP,A) 実公 昭57−41416(JP,Y2) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-103257 (JP, A) Actual publication S57-41416 (JP, Y2)
Claims (1)
(1)の低容量運転時間を積算する運転時間積算手段
(33)と、該積算手段(33)により積算された運転
時間が所定時間以上に達すると冷媒サイクル(18)中
の圧縮機潤滑油を回収するよう圧縮機(1)を一定時間
高容量運転させる潤滑油回収運転制御手段(34)とを
備えた冷凍装置において、圧縮機(1)から吐出された
冷媒の圧力が所定圧以上に上昇したことを検出する圧力
上昇検出手段(PS2)と、上記潤滑油回収運転制御手
段(34)により圧縮機(1)が潤滑油回収のために高
容量運転されているときに、上記圧力上昇検出手段(P
S2)の出力を受けると、圧縮機(1)の高容量運転を
強制的に終了させる潤滑油回収運転停止手段(35)と
を設けたことを特徴とする冷凍装置。1. A compressor (1) having a variable capacity, an operating time accumulating means (33) for accumulating a low capacity operating time of the compressor (1), and an operating time accumulated by the accumulating means (33). In a refrigerating apparatus provided with a lubricating oil recovery operation control means (34) for operating the compressor (1) in a high capacity for a certain time so as to recover the compressor lubricating oil in the refrigerant cycle (18) when the temperature reaches a predetermined time or more. The pressure rise detection means (PS2) for detecting that the pressure of the refrigerant discharged from the compressor (1) rises above a predetermined pressure, and the compressor (1) is controlled by the lubricating oil recovery operation control means (34). When operating at a high capacity for recovering the lubricating oil, the pressure increase detecting means (P
A refrigeration system provided with a lubricating oil recovery operation stopping means (35) for forcibly ending the high capacity operation of the compressor (1) when receiving the output of S2).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60259301A JPH0654186B2 (en) | 1985-11-18 | 1985-11-18 | Refrigeration equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60259301A JPH0654186B2 (en) | 1985-11-18 | 1985-11-18 | Refrigeration equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS62119366A JPS62119366A (en) | 1987-05-30 |
JPH0654186B2 true JPH0654186B2 (en) | 1994-07-20 |
Family
ID=17332174
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60259301A Expired - Lifetime JPH0654186B2 (en) | 1985-11-18 | 1985-11-18 | Refrigeration equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0654186B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016194389A (en) * | 2015-04-01 | 2016-11-17 | ジョンソンコントロールズ ヒタチ エア コンディショニング テクノロジー(ホンコン)リミテッド | Refrigerating apparatus and refrigerator unit |
US10571159B2 (en) | 2015-08-04 | 2020-02-25 | Mitsubishi Electric Corporation | Refrigeration apparatus and method for operating refrigeration apparatus |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2508842B2 (en) * | 1989-06-29 | 1996-06-19 | 三菱電機株式会社 | Air conditioner |
EP1493978B1 (en) * | 2002-04-08 | 2010-06-02 | Daikin Industries, Ltd. | Refrigerator |
WO2019087401A1 (en) * | 2017-11-06 | 2019-05-09 | ダイキン工業株式会社 | Air conditioning device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5715297A (en) * | 1980-07-02 | 1982-01-26 | Hitachi Ltd | Memory element |
JPS5741416U (en) * | 1980-08-13 | 1982-03-06 | ||
JPS60103257A (en) * | 1983-11-11 | 1985-06-07 | 三菱重工業株式会社 | Refrigerator |
JPS60191153A (en) * | 1984-03-09 | 1985-09-28 | 三洋電機株式会社 | Defroster for refrigerator |
-
1985
- 1985-11-18 JP JP60259301A patent/JPH0654186B2/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016194389A (en) * | 2015-04-01 | 2016-11-17 | ジョンソンコントロールズ ヒタチ エア コンディショニング テクノロジー(ホンコン)リミテッド | Refrigerating apparatus and refrigerator unit |
US10571159B2 (en) | 2015-08-04 | 2020-02-25 | Mitsubishi Electric Corporation | Refrigeration apparatus and method for operating refrigeration apparatus |
Also Published As
Publication number | Publication date |
---|---|
JPS62119366A (en) | 1987-05-30 |
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