JPH07269974A - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JPH07269974A JPH07269974A JP8589494A JP8589494A JPH07269974A JP H07269974 A JPH07269974 A JP H07269974A JP 8589494 A JP8589494 A JP 8589494A JP 8589494 A JP8589494 A JP 8589494A JP H07269974 A JPH07269974 A JP H07269974A
- Authority
- JP
- Japan
- Prior art keywords
- refrigerant
- outdoor
- heat exchanger
- unit
- outdoor heat
- 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.)
- Pending
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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
-
- 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
- F25B2400/07—Details of compressors or related parts
- F25B2400/075—Details of compressors or related parts with parallel compressors
Landscapes
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、室内ユニットから延び
るユニット間配管に、室外ユニットを複数台並列につな
いだ空気調和装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner in which a plurality of outdoor units are connected in parallel to inter-unit piping extending from an indoor unit.
【０００２】[0002]
【従来の技術】一般に、複数台の室内ユニットを並列に
配置すると共に、各室内ユニットにつながれるユニット
間配管に対し、圧縮機、及び室外熱交換器等を内蔵する
複数台の室外ユニットを並列に接続してなるビル用のマ
ルチ形空気調和装置は知られている（例えば、特開平２
−８５６５６号公報参照）。この種のマルチ形空気調和
装置は、装置の大容量システム化が図れるという利点が
ある。2. Description of the Related Art Generally, a plurality of indoor units are arranged in parallel, and a plurality of outdoor units containing a compressor, an outdoor heat exchanger, etc. are arranged in parallel to the inter-unit piping connected to each indoor unit. A multi-type air conditioner for buildings, which is connected to a building, is known (for example, Japanese Patent Application Laid-Open No. Hei 2
-85656 gazette). This type of multi-type air conditioner has an advantage that a large capacity system can be realized.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
マルチ形空気調和装置では、複数台の室外ユニットに対
して冷媒が並列的に流れるので、いずれかの室外ユニッ
トの運転が停止すると、その停止した室外ユニットの室
外熱交換器内に冷媒が残留（寝込み）し、その分だけシ
ステム全体としては冷媒不足になるという問題がある。However, in the conventional multi-type air conditioner, since the refrigerant flows in parallel to a plurality of outdoor units, when the operation of any of the outdoor units is stopped, the operation is stopped. There is a problem that the refrigerant remains (sleeps) in the outdoor heat exchanger of the outdoor unit, and the entire system becomes short by that amount.
【０００４】これを解消するためには、停止中の室外ユ
ニットの室外熱交換器を開閉弁操作などにより、運転中
の室外ユニットの吸込み経路につなぎ、停止中の室外熱
交換器内に残留する冷媒を、運転中の室外ユニット側に
吸い出すようにして冷媒回収を行うことが考えられる。In order to solve this, the outdoor heat exchanger of the stopped outdoor unit is connected to the suction path of the operating outdoor unit by operating the on-off valve, and remains in the stopped outdoor heat exchanger. It is conceivable to collect the refrigerant by sucking the refrigerant to the outdoor unit side during operation.
【０００５】しかしながら、この方法によると、外気温
度が比較的高い冷房運転時には、停止中の室外ユニット
内に残留する冷媒の圧力そのものが高い（約１３kg／cm
2 ）ので、効率よく冷媒を回収することができても、外
気温度が低い暖房運転時には冷媒の圧力が低く（約５kg
／cm2 ）なるので、運転中の室外ユニットの圧縮機の吸
込み圧によっては吸い込むことができず、効率よく冷媒
を回収することができなくなるという問題がある。However, according to this method, during cooling operation in which the outside air temperature is relatively high, the pressure itself of the refrigerant remaining in the stopped outdoor unit is high (about 13 kg / cm 2).
2 ) Therefore, even if the refrigerant can be efficiently recovered, the pressure of the refrigerant is low (about 5 kg) during heating operation where the outside air temperature is low.
/ So cm 2) made, it can not be sucked by the suction pressure of the compressor of the outdoor unit in operation, efficient there is a problem that it becomes impossible to recover the refrigerant.
【０００６】そこで、本発明の目的は、上述した従来の
技術が有する問題点を解消し、冷房運転時においても停
止中の室外熱交換器内に残留する冷媒を効率よく回収す
ることのできる冷媒回収手段を備える空気調和装置を提
供することにある。Therefore, an object of the present invention is to solve the problems of the above-mentioned conventional techniques and to efficiently recover the refrigerant remaining in the outdoor heat exchanger that is stopped even during the cooling operation. An object of the present invention is to provide an air conditioner provided with a recovery means.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、第１の発明は、室外熱交換器と、圧縮機と、油分離
器とを有し、この油分離器により分離される潤滑油を戻
し管を介して前記圧縮機へ戻す室外ユニットを複数台備
え、これら室外ユニットを室内ユニットから延びるユニ
ット間配管に並列につなぐと共に、各室外ユニットの戻
し管どうしをバランス管でつないだ空気調和装置におい
て、運転中の室外ユニット内を循環する高圧冷媒を停止
中の室外ユニットの室外熱交換器に送り込み、この高圧
冷媒の送り込みにより押出される冷媒を前記バランス管
を通じて運転中の室外ユニット内に回収する冷媒回収手
段を備えたものである。To achieve the above object, the first invention comprises an outdoor heat exchanger, a compressor, and an oil separator, and lubrication separated by this oil separator. A plurality of outdoor units that return oil to the compressor via a return pipe are provided, and the outdoor units are connected in parallel to the inter-unit pipes extending from the indoor units, and the return pipes of each outdoor unit are connected by a balance pipe. In the harmony device, the high-pressure refrigerant circulating in the operating outdoor unit is sent to the outdoor heat exchanger of the stopped outdoor unit, and the refrigerant extruded by the feeding of the high-pressure refrigerant is in the operating outdoor unit through the balance pipe. It is provided with a refrigerant recovery means for recovering.
【０００８】第２の発明は、冷媒回収手段は、室外熱交
換器から押し出される冷媒を直接バランス管に送り込む
ためのバイパス経路を備えるものである。According to a second aspect of the present invention, the refrigerant recovery means has a bypass path for directly feeding the refrigerant extruded from the outdoor heat exchanger to the balance pipe.
【０００９】また、第３の発明は、冷媒回収手段は、室
外熱交換器から押し出される冷媒を四方弁、アキューム
レータを介してバランス管に送り込む経路を備えるもの
である。According to a third aspect of the present invention, the refrigerant recovery means is provided with a path for sending the refrigerant pushed out from the outdoor heat exchanger to the balance pipe via the four-way valve and the accumulator.
【００１０】[0010]
【作用】暖房運転時には、通常、外気温度が冷たいか
ら、停止した室外ユニット内の残留冷媒の圧力は約５kg
／cm2 程度と低い。そのために、かりに停止中の室外ユ
ニットの室外熱交換器を開閉弁操作などにより運転中の
室外ユニットの吸込み経路につなぎ、停止中の室外熱交
換器内に残留する冷媒を、運転中の室外ユニット側に吸
い出すようにして冷媒回収を行おうとしても、冷媒圧力
が低すぎて効果的な冷媒回収は行われない。ところが、
第１の発明によれば、停止中の室外熱交換器内に高圧冷
媒を導いて、この高圧冷媒により室外熱交換器内の残留
冷媒を押し出すので、運転中の室外ユニットの圧縮機に
効率よく吸込まれ、効果的な冷媒回収が行われる。ま
た、第２の発明によれば、室外熱交換器から押し出され
る寝込み冷媒を直接バランス管に送り込むためのバイパ
ス経路を備えるので、停止中の室外熱交換器内に残留す
る冷媒をほぼ確実に回収できる。第３の発明によれば、
余分なバイパス経路を設けることなく、従来の構造のま
ゝで、開閉弁の操作だけで寝込み冷媒を回収できる。[Function] During heating operation, the outside air temperature is usually cold, so the pressure of the residual refrigerant in the stopped outdoor unit is approximately 5 kg.
/ Cm 2 is low. Therefore, the outdoor heat exchanger of the stopped outdoor unit is connected to the suction path of the operating outdoor unit by operating the on-off valve, etc., and the refrigerant remaining in the stopped outdoor heat exchanger is replaced by the operating outdoor unit. Even if the refrigerant is collected by sucking it to the side, the refrigerant pressure is too low to effectively collect the refrigerant. However,
According to the first aspect of the present invention, the high-pressure refrigerant is guided into the outdoor heat exchanger that is stopped, and the residual refrigerant in the outdoor heat exchanger is pushed out by the high-pressure refrigerant, so that the compressor of the outdoor unit that is operating can be efficiently used. Suctioned and effective refrigerant recovery is performed. Further, according to the second aspect of the present invention, since the bypass passage for sending the sleeping refrigerant extruded from the outdoor heat exchanger directly to the balance pipe is provided, the refrigerant remaining in the stopped outdoor heat exchanger is almost certainly recovered. it can. According to the third invention,
The existing refrigerant can be collected by simply operating the on-off valve without changing the conventional bypass structure.
【００１１】[0011]
【実施例】以下、本発明の実施例を図面を参照して説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【００１２】図１において、１1 ，１2 は室外ユニット
を示し、３は室内ユニットを示している。室外ユニット
１1 は、アキュームレータ１０1 と、圧縮機１１1 と、
油分離器１２1 と、四方弁１３1 と、室外熱交換器１４
1 と、室外電動式膨脹弁１５1 と、冷媒調節器１６1 と
で構成されている。室外ユニット１2 については以下の
構成を含めて、室外ユニット１1 と略同一であるためそ
の説明は省略する。ただ、室外ユニット１1 において
は、圧縮機１１1 は０〜５馬力まで能力が可変可能な能
力可変型圧縮機Ａと５馬力の能力一定型圧縮機Ｂとから
構成されており、又室外熱交換器１４1 は２つのものを
並列につないで構成されている。これに対し室外ユニッ
ト１2 においては、圧縮機１１2 は６馬力の能力一定型
圧縮機のみであり、室外熱交換器１４2 は１つである。
この相違によって、室外ユニット１1 は１０馬力の能力
可変型の室外ユニットとなり、室外ユニット１2 は６馬
力の能力一定型の室外ユニットとなっている。In FIG. 1, 1 1 and 1 2 are outdoor units, and 3 is an indoor unit. The outdoor unit 1 1 includes an accumulator 10 1 , a compressor 11 1 , and
Oil separator 12 1 , four-way valve 13 1 and outdoor heat exchanger 14
1 , an outdoor electric expansion valve 15 1 and a refrigerant regulator 16 1 . The outdoor unit 1 2 is substantially the same as the outdoor unit 1 1 including the following configurations, and the description thereof is omitted. However, in the outdoor unit 1 1, the compressor 11 1 is composed of a capacity fixed type compressor B of the ability to 0-5 horsepower variable capable variable capacity type compressor A and 5 horsepower, and the outdoor heat The exchanger 14 1 is configured by connecting two things in parallel. On the other hand, in the outdoor unit 1 2 , the compressor 11 2 is only a 6-horsepower constant capacity compressor, and the outdoor heat exchanger 14 2 is one.
Due to this difference, the outdoor unit 1 1 is an outdoor unit with a variable capacity of 10 horsepower, and the outdoor unit 1 2 is an outdoor unit with a constant capacity of 6 horsepower.
【００１３】油分離器１２1 は、圧縮機１１1 から吐出
される冷媒中の潤滑油を分離するものであり、ここで分
離された潤滑油は戻し管２１1 ，２２1 ，２３1 を通じ
て圧縮機１１1 に戻される。これらの戻し管には第１な
いし第３の開閉弁２４1 ，２５1 ，２６1 から構成され
る制御弁が設けられる。The oil separator 12 1 separates the lubricating oil in the refrigerant discharged from the compressor 11 1 , and the lubricating oil separated here is compressed through the return pipes 21 1 , 22 1 , 23 1 . Returned to machine 11 1 . These return pipes are provided with control valves composed of first to third opening / closing valves 24 1 , 25 1 , 26 1 .
【００１４】室外ユニット１1 ，１2 の戻し管２１1 ，
２１2 どうしは、バランス管５１によりつながれる。こ
のバランス管５１は補助管５２1 を通じて、四方弁１３
1 とチェッキ弁５３1 との間につながれ、この補助管５
２1 には第４の開閉弁５４1が設けられている。Return pipes 21 1 of the outdoor units 1 1 and 1 2 ,
21 2 are connected by a balance pipe 51. The balance pipe 51 is connected to the four-way valve 13 through the auxiliary pipe 52 1.
This auxiliary pipe 5 is connected between 1 and the check valve 53 1.
A second on-off valve 54 1 is provided at 2 1 .
【００１５】また、四方弁１３1 とチェッキ弁５３1 の
間からは、除霜運転時にホットガスを流すための除霜用
補助管１００1 が分岐し、この除霜用補助管１００
1 は、除霜用開閉弁１０１1 を介して、室外熱交換器１
４1 と室外電動式膨脹弁１５1 の間につながれている。A defrosting auxiliary pipe 100 1 for flowing hot gas during the defrosting operation branches from between the four-way valve 13 1 and the check valve 53 1 and the defrosting auxiliary pipe 100 1
1, via a defrost-off valve 101 1, the outdoor heat exchanger 1
It is connected between 4 1 and the outdoor electric expansion valve 15 1 .
【００１６】しかして、第１の実施例としては、室外熱
交換器１４1 と四方弁１３1 の間から冷媒回収用バイパ
ス管２００1 が分岐し、このバイパス管２００1 は、冷
媒回収用開閉弁２０１1 を介して直接バランス管５１に
つながれている。In the first embodiment, however, the refrigerant recovery bypass pipe 200 1 branches from between the outdoor heat exchanger 14 1 and the four-way valve 13 1 , and this bypass pipe 200 1 opens and closes for refrigerant recovery. It is coupled directly to the balance pipe 51 through a valve 201 1.
【００１７】Ｓ1 ，Ｓ2 は圧縮機１１1 ，１１2 の潤滑
油の量を検知するための潤滑油センサで、このセンサで
検出された値は図示しない制御器に入力され、この制御
器からの出力により、第１ないし第４開閉弁２４1 ，２
５1 ，２６1 ，５４1 などの開閉動作が制御される。S 1 and S 2 are lubricating oil sensors for detecting the amount of lubricating oil in the compressors 11 1 and 11 2. The values detected by these sensors are input to a controller (not shown). Depending on the output from the first to fourth on-off valves 24 1 , 2
Opening / closing operations of 5 1 , 26 1 , 54 1, etc. are controlled.
【００１８】室内ユニット３は、室内熱交換器３４と、
室内電動式膨脹弁３５（以下「室内メカ弁３５」とい
う）とで構成される。この室内ユニット３からは、ガス
管５及び液管７からなるユニット間配管が延び出し、こ
のユニット間配管には、室外ユニット１1 ，１2 が並列
に接続される。The indoor unit 3 includes an indoor heat exchanger 34,
The indoor electric expansion valve 35 (hereinafter referred to as "indoor mechanical valve 35"). From this indoor unit 3, an inter-unit pipe consisting of a gas pipe 5 and a liquid pipe 7 extends, and the outdoor units 1 1 and 1 2 are connected in parallel to this inter-unit pipe.
【００１９】次に、作用を説明する。Next, the operation will be described.
【００２０】冷房運転時において、四方弁１３1 は実線
状態に設定され、冷媒は図１に矢印で示す方向に流れ
る。この場合には、室外ユニット１1 ，１2 はともに運
転され、室外電動式膨脹弁１５1 ，１５2 は略全開で、
室内メカ弁３５は負荷に応じて開度調整される。室外熱
交換器１４1 ，１４2 は凝縮器として作用し、室内熱交
換器３４は蒸発器として作用する。即ち、室内熱交換器
３４からは冷風が送出され、冷房運転が行われる。During the cooling operation, the four-way valve 13 1 is set to the solid line state, and the refrigerant flows in the direction shown by the arrow in FIG. In this case, the outdoor unit 1 1, 1 2 are both operated, the outdoor electric expansion valve 15 1, 15 2 is substantially fully opened,
The opening degree of the indoor mechanical valve 35 is adjusted according to the load. The outdoor heat exchangers 14 1 and 14 2 act as condensers, and the indoor heat exchanger 34 acts as an evaporator. That is, the cool air is sent from the indoor heat exchanger 34, and the cooling operation is performed.
【００２１】暖房運転時において、四方弁１３1 は破線
状態に設定され、冷媒は同図中で矢印と反対の方向に流
れる。この場合には、室外ユニット１1 ，１2 はともに
運転され、電動式膨脹弁１５1 ，１５2 、及び室内メカ
弁３５は負荷に応じて開度調整される。室外熱交換器１
４1 ，１４2 は蒸発器として作用し、室内熱交換器３４
は凝縮機として作用する。即ち、室内熱交換器３４から
は温風が送出され、暖房運転が行われる。During the heating operation, the four-way valve 13 1 is set to the broken line state, and the refrigerant flows in the direction opposite to the arrow in the figure. In this case, the outdoor unit 1 1, 1 2 are both operated, motorized expansion valve 15 1, 15 2, and the indoor mechanical valve 35 is opening control according to the load. Outdoor heat exchanger 1
4 1 and 14 2 act as an evaporator, and the indoor heat exchanger 34
Acts as a condenser. That is, warm air is sent from the indoor heat exchanger 34, and heating operation is performed.
【００２２】このような冷房並びに暖房運転時におい
て、空調負荷の変動によって複数の室外ユニット１1 ，
１2 の運転の発停が制御される。During such cooling and heating operations, a plurality of outdoor units 1 1 ,
The start / stop of the operation of 1 2 is controlled.
【００２３】すなわち、空調負荷が大きい時はいずれの
室外ユニット１1 ，１2 も運転され、それが小さい時に
は一方の室外ユニット１1 のみ運転される。このような
運転によって空調負荷に見合った室外ユニットの運転馬
力が設定される。That is, when the air conditioning load is large, both the outdoor units 1 1 and 1 2 are operated, and when the air conditioning load is small, only one outdoor unit 1 1 is operated. By such an operation, the operating horsepower of the outdoor unit that matches the air conditioning load is set.
【００２４】室外ユニットの運転馬力が設定され、例え
ば一方の室外ユニット１2 の運転が停止されたとする
と、室外熱交換器１４2 に冷媒が寝込み、その分だけシ
ステム全体としての冷媒量が不足する。If the operating horsepower of the outdoor unit is set and, for example, the operation of one of the outdoor units 1 2 is stopped, the refrigerant stagnates in the outdoor heat exchanger 14 2 and the amount of refrigerant in the entire system becomes insufficient accordingly. .
【００２５】暖房運転時にこの冷媒不足が発生した時、
この実施例によれば、図２に示すように、除霜用開閉弁
１０１2 を開くと共に、冷媒回収用開閉弁２０１2 を開
く。除霜用開閉弁１０１2 を開くことにより、運転中の
室外ユニット１1 から吐出された高圧冷媒（ホットガ
ス）は室内ユニット３へ流れるものの、一部の高圧冷媒
は停止中の室外ユニット１2 の四方弁１３2 を介して室
外熱交換器１４2 に導かれ、その高圧冷媒は室外熱交換
器１４2 内の残留冷媒を押し出し、この押し出された残
留冷媒はバイパス管２００2 を通って直接バランス管５
１に送り込まれる。そして、このバランス管５１を通っ
て、矢印で示すように開閉弁２３1 ，２５1 を通って圧
縮機１１1 に吸い込まれ、これにより残留冷媒は回収さ
れる。When this refrigerant shortage occurs during heating operation,
According to this embodiment, as shown in FIG. 2, opens the defrosting off valve 101 2, opening the refrigerant recovery-off valve 201 2. By opening the defrost-off valve 101 2, high-pressure refrigerant (hot gas) discharged from the outdoor unit 1 1 in operation although flows to the indoor unit 3, the outdoor unit 1 2 in some high-pressure refrigerant is stopped Is introduced into the outdoor heat exchanger 14 2 via the four-way valve 13 2 of the above, the high-pressure refrigerant thereof pushes out the residual refrigerant in the outdoor heat exchanger 14 2 , and the pushed out residual refrigerant directly passes through the bypass pipe 200 2. Balance tube 5
Sent to 1. Then, through the balance pipe 51, as shown by the arrows, through the on-off valves 23 1 and 25 1 , and sucked into the compressor 11 1 , the residual refrigerant is recovered.
【００２６】ただし、停止中の室外熱交換器１４2 にホ
ットガスを余り長時間送り込むと、逆に冷媒が寝込んで
しまうおそれがある。However, if the hot gas is sent to the outdoor heat exchanger 14 2 which is stopped for a long time, the refrigerant may conversely fall asleep.
【００２７】これを解消するためには、冷媒回収用開閉
弁２０１2 は開いたまゝで、除霜用開閉弁１０１2 は１
０〜２０秒間開いたら１０分間程度は閉じてこの操作を
繰り返すことにより冷媒回収を行うことが望ましい。In order to solve this, the refrigerant recovery opening / closing valve 201 2 is kept open and the defrosting opening / closing valve 10 12 is set to 1.
It is desirable to recover the refrigerant by opening it for 0 to 20 seconds, closing it for about 10 minutes, and repeating this operation.
【００２８】この暖房運転時には、通常、外気温度が冷
たいから、停止した室外ユニット１ 2 内の残留冷媒の圧
力は約５kg／cm2 と低く、そのため、上記のように、室
外熱交換器１４2 内に高圧冷媒を導いて、室外熱交換器
１４2 内の残留冷媒を押し出さない限り、効果的な冷媒
回収は行われない。During this heating operation, the outside air temperature is usually cold.
I want to stop the outdoor unit 1 2Pressure of residual refrigerant in
Power is about 5kg / cm2And low, therefore, as above, the room
External heat exchanger 142Outdoor heat exchanger by introducing high pressure refrigerant inside
142Effective refrigerant as long as it does not push out residual refrigerant in
No recovery is done.
【００２９】冷房運転時には外気が暖かいので、冷媒の
圧力は約１３kg／cm2 と高い。この場合には、室外熱交
換器１４2 内に高圧冷媒を導かなくても、開閉弁操作に
より停止した室外ユニット１2 の室外熱交換器１４2 を
運転中の室外ユニット１1 の吸い込み系路につなぐだけ
で、冷媒の圧力差に従って、圧縮機１１1 に吸い込まれ
るので、これにより冷媒が回収される。Since the outside air is warm during the cooling operation, the pressure of the refrigerant is as high as about 13 kg / cm 2 . In this case, even without direct the high pressure refrigerant to the outdoor heat exchanger 14 2, a suction pathway of the outdoor unit 1 1 in operation the outdoor heat exchanger 14 2 of the outdoor unit 1 2 is stopped by the opening and closing valve operation The refrigerant is sucked into the compressor 11 1 according to the pressure difference of the refrigerant only by connecting the refrigerant to the refrigerant, whereby the refrigerant is recovered.
【００３０】第１の実施例では、冷媒回収用バイパス管
２００1 と開閉弁２０１1 を設けたが、第２の実施例と
して、これらを設けなくとも、暖房運転時の冷媒回収を
効果的に行うことができる。In the first embodiment, the refrigerant recovery bypass pipe 200 1 and the on-off valve 201 1 are provided, but as the second embodiment, it is possible to effectively recover the refrigerant during the heating operation without providing them. It can be carried out.
【００３１】第２の実施例によれば、暖房運転時の冷媒
回収操作として、図３に示すように、除霜用開閉弁１０
１2 を開くと共に、第１の開閉弁２４2 を開く操作が行
われる。これによれば、実線矢印で示すように、まず一
部の高圧冷媒が停止中の室外熱交換器１４2 に導かれ、
その高圧冷媒により残留冷媒が押し出され、この押し出
された残留冷媒は四方弁１３2 、アキュームレータ１０
2 、更に第１の開閉弁２４2 を介してバランス管５１に
導かれる。そして、このバランス管５１を通って、矢印
で示すように開閉弁２３1 ，２５1 を通って圧縮機１１
1 に吸い込まれ、これにより残留冷媒は回収される。According to the second embodiment, as the refrigerant recovery operation during the heating operation, as shown in FIG. 3, the defrosting on-off valve 10 is used.
An operation of opening the first on-off valve 24 2 is performed while opening 1 2 . According to this, as shown by solid arrows, first part of the high-pressure refrigerant is led to the outdoor heat exchanger 14 2 of the stopped,
Residual refrigerant is pushed out by the high-pressure refrigerant, and the pushed out residual refrigerant is supplied to the four-way valve 13 2 and the accumulator 10.
2 , and is further guided to the balance pipe 51 via the first opening / closing valve 24 2 . Then, passing through the balance pipe 51 and passing through the on-off valves 23 1 and 25 1 as shown by arrows, the compressor 11
It is sucked into 1 , so that the residual refrigerant is recovered.
【００３２】この場合、残留冷媒は四方弁１３2 、アキ
ュームレータ１０2 を通ってから運転中の室外ユニット
１1 の圧縮機１１1 に吸い込まれるので、長い冷媒管を
通ることになり、途中に冷媒が残留し易いが、第１の実
施例のように余分なバイパス管や開閉弁を設けなくても
よい等の効果が得られる。In this case, the residual refrigerant passes through the four-way valve 13 2 and the accumulator 10 2 and then is sucked into the compressor 11 1 of the operating outdoor unit 1 1. However, it is possible to obtain the effect that it is not necessary to provide an extra bypass pipe or an on-off valve unlike the first embodiment.
【００３３】[0033]
【発明の効果】以上の説明から明らかなように、本発明
によれば、暖房運転時においても停止中の室外熱交換器
内に残留する冷媒を効率よく回収することができる。As is apparent from the above description, according to the present invention, the refrigerant remaining in the outdoor heat exchanger that is stopped can be efficiently recovered even during the heating operation.
【図１】本発明による空気調和装置の一実施例を示す冷
媒回路図である。FIG. 1 is a refrigerant circuit diagram showing an embodiment of an air conditioner according to the present invention.
【図２】冷房運転時の冷媒回収状態を示す冷媒回路図で
ある。FIG. 2 is a refrigerant circuit diagram showing a refrigerant recovery state during a cooling operation.
【図３】他の実施例を示す冷媒回路図である。FIG. 3 is a refrigerant circuit diagram showing another embodiment.
１1 ，１2 室外ユニット １１1 ，１１2 圧縮機 １２1 ，１２2 油分離器 １４1 ，１４2 室外熱交換器 ２１1 ，２２1 ，２３1 戻し管 ２４1 ，２５1 ，２６1 第１ないし第３の開閉弁 ５１ バランス管 １００1 ，１００2 除霜用補助管 １０１1 ，１０１2 除霜用開閉弁 ２００1 ，２００2 冷媒回収用バイパス管 ２０１1 ，２０１2 冷媒回収用開閉弁1 1 , 1 2 Outdoor unit 11 1 , 11 2 Compressor 12 1 , 12 2 Oil separator 14 1 , 14 2 Outdoor heat exchanger 21 1 , 22 1 , 23 1 Return pipe 24 1 , 25 1 , 26 1 No. 1st thru | or 3rd on-off valve 51 Balance pipe 100 1 , 100 2 Defrosting auxiliary pipe 101 1 , 101 2 Defrosting on-off valve 200 1 , 200 2 Refrigerant recovery bypass pipe 201 1 , 201 2 Refrigerant recovery on-off valve
Claims (3)
を有し、この油分離器により分離される潤滑油を戻し管
を介して前記圧縮機へ戻す室外ユニットを複数台備え、
これら室外ユニットを室内ユニットから延びるユニット
間配管に並列につなぐと共に、前記各室外ユニットの戻
し管どうしをバランス管でつないだ空気調和装置におい
て、運転中の室外ユニット内を循環する高圧冷媒を停止
中の室外ユニットの室外熱交換器に送り込み、この高圧
冷媒の送り込みにより押出される冷媒を前記バランス管
を通じて運転中の室外ユニット内に回収する冷媒回収手
段を備えたことを特徴とする空気調和装置。1. A plurality of outdoor units, each having an outdoor heat exchanger, a compressor, and an oil separator, for returning the lubricating oil separated by the oil separator to the compressor through a return pipe. ,
These outdoor units are connected in parallel to the inter-unit pipes extending from the indoor units, and in the air conditioner in which the return pipes of each of the outdoor units are connected by a balance pipe, the high-pressure refrigerant circulating in the operating outdoor unit is stopped. An air conditioner comprising: a refrigerant recovery unit that supplies the refrigerant to the outdoor heat exchanger of the outdoor unit and that is extruded by the high-pressure refrigerant being sent into the operating outdoor unit through the balance pipe.
押し出される冷媒を直接バランス管に送り込むためのバ
イパス経路を備えることを特徴とする請求項１記載の空
気調和装置。2. The air conditioner according to claim 1, wherein the refrigerant recovery means includes a bypass path for directly sending the refrigerant extruded from the outdoor heat exchanger to the balance pipe.
押し出される冷媒を四方弁、アキュームレータを介して
バランス管に送り込む経路を備えることを特徴とする請
求項１記載の空気調和装置。3. The air conditioner according to claim 1, wherein the refrigerant recovery means includes a path for sending the refrigerant pushed out from the outdoor heat exchanger to the balance pipe via a four-way valve and an accumulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8589494A JPH07269974A (en) | 1994-03-31 | 1994-03-31 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8589494A JPH07269974A (en) | 1994-03-31 | 1994-03-31 | Air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07269974A true JPH07269974A (en) | 1995-10-20 |
Family
ID=13871597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8589494A Pending JPH07269974A (en) | 1994-03-31 | 1994-03-31 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07269974A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004353881A (en) * | 2003-05-27 | 2004-12-16 | Sanyo Electric Co Ltd | Air-conditioning system |
| CN100354577C (en) * | 2003-10-20 | 2007-12-12 | Lg电子株式会社 | System and method for controlling air conditioner |
| JP2008249229A (en) * | 2007-03-30 | 2008-10-16 | Yanmar Co Ltd | Air conditioner |
| EP2515053A3 (en) * | 2011-04-22 | 2017-05-31 | LG Electronics Inc. | Multi type air conditioner and operating method |
-
1994
- 1994-03-31 JP JP8589494A patent/JPH07269974A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004353881A (en) * | 2003-05-27 | 2004-12-16 | Sanyo Electric Co Ltd | Air-conditioning system |
| CN100354577C (en) * | 2003-10-20 | 2007-12-12 | Lg电子株式会社 | System and method for controlling air conditioner |
| JP2008249229A (en) * | 2007-03-30 | 2008-10-16 | Yanmar Co Ltd | Air conditioner |
| JP4532517B2 (en) * | 2007-03-30 | 2010-08-25 | ヤンマー株式会社 | Air conditioner |
| EP2515053A3 (en) * | 2011-04-22 | 2017-05-31 | LG Electronics Inc. | Multi type air conditioner and operating method |
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