JP2975612B2 - Multi air conditioner - Google Patents
Multi air conditionerInfo
- Publication number
- JP2975612B2 JP2975612B2 JP1211937A JP21193789A JP2975612B2 JP 2975612 B2 JP2975612 B2 JP 2975612B2 JP 1211937 A JP1211937 A JP 1211937A JP 21193789 A JP21193789 A JP 21193789A JP 2975612 B2 JP2975612 B2 JP 2975612B2
- Authority
- JP
- Japan
- Prior art keywords
- indoor
- valve
- outdoor
- pipe
- valves
- 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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- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は複数の室内ユニットを有するマルチ空気調和
機に関するもので、特に、室内ユニットの運転台数が変
化したり、冷房運転と暖房運転が変化したときの能力変
動を小さくするようにしたマルチ空気調和機に関するも
のである。Description: TECHNICAL FIELD The present invention relates to a multi-air conditioner having a plurality of indoor units, and in particular, changes the number of operating indoor units and changes between cooling operation and heating operation. The present invention relates to a multi-type air conditioner in which a fluctuation in performance when the air conditioner is performed is reduced.
［従来の技術］ 複数の室内ユニットを有する空気調和機の従来例とし
て、例えば特開昭49−127254号公報記載のように、室内
ユニットの数と同数の四方弁および室外熱交換器を室外
ユニットに備え、室内ユニットと室外熱交換器とを対応
させて運転させることによって、室内ユニットを冷房お
よび暖房運転できるようにしたものがある。[Prior Art] As a conventional example of an air conditioner having a plurality of indoor units, as disclosed in Japanese Patent Application Laid-Open No. 49-127254, for example, a four-way valve and the same number of outdoor heat exchangers as the number of indoor units are used. In some cases, the indoor unit and the outdoor heat exchanger are operated in association with each other so that the indoor unit can be operated for cooling and heating.
［発明が解決しようとする課題］ 上記従来技術は室内ユニット毎に四方弁と室外熱交換
器が必要であり、接続される室内ユニットの数および容
量に合せて、室外ユニットを製作する必要があり、室外
ユニットに汎用性がなかった。また、それぞれの室内ユ
ニットが冷房と暖房を要求される場合、それぞれの室内
ユニットと室外熱交換器で冷凍サイクルを構成するため
に、圧縮機はそれぞれの冷凍サイクルに必要な冷媒量を
供給しなければならなかった。[Problems to be Solved by the Invention] The above-described conventional technology requires a four-way valve and an outdoor heat exchanger for each indoor unit, and it is necessary to manufacture an outdoor unit according to the number and capacity of the connected indoor units. The outdoor unit did not have versatility. In addition, when each indoor unit requires cooling and heating, the compressor must supply the required amount of refrigerant to each refrigeration cycle in order to configure a refrigeration cycle with each indoor unit and outdoor heat exchanger. I had to.
本発明の１目的は、マルチ空気調和機において、接続
される室内ユニットの数が変化しても室外ユニットを変
えることなく対応できるようにし室外ユニットに汎用性
を与えることにある。さらに、他の目的は、或る室内ユ
ニットが冷房運転され、他の室内ユニットが暖房運転さ
れるような冷房暖房同時運転のとき、熱回収サイクルに
よって、圧縮機の冷媒供給量を低減し、電気代を節約す
ることにある。An object of the present invention is to provide a multi-type air conditioner that can cope with a change in the number of connected indoor units without changing the outdoor units, thereby giving the outdoor units versatility. Further, another object is to reduce the refrigerant supply amount of the compressor by the heat recovery cycle when cooling and heating are simultaneously performed such that a certain indoor unit is operated for cooling and another indoor unit is operated for heating. Saving money.
［課題を解決するための手段］ 本発明のマルチ空気調和機は特許請求の範囲の夫々の
請求項に記載の構成を有する。[Means for Solving the Problems] A multi-type air conditioner of the present invention has a configuration described in each claim of the claims.
［作用］ 複数の室外熱交換器の各々は夫々に接続された室外膨
張弁を閉じれば冷媒が流れなくなり、熱交換器として働
かなくなる。この事を利用して、室内ユニットの運転台
数に依って、用いる室外熱交換器の数を室外膨張弁で制
御する。これによって、運転される室内ユニットのトー
タル容量に合った室外熱交換器が得られる。たとえば、
室外熱交換器が２台あって室内ユニット全台数を運転す
るときは、２つの室外膨張弁を開いて室外熱交換器を２
つとも使う。いくつかの室内ユニットを運転し、他の室
内ユニットを停止するときは、１つの室外膨張弁を閉
じ、もう１つの室外膨張弁を開いて、室外熱交換器を１
つだけ使う。同様に、接続される室内ユニットの容量が
変わっても、室外膨張弁を閉じることによって室外熱交
換器の容量が調整でき、接続される室内ユニットの数や
容量によって室外ユニットを変更する必要がなく、汎用
性のある室外ユニットが提供できる。[Operation] When the outdoor expansion valves connected to each of the plurality of outdoor heat exchangers are closed, the refrigerant stops flowing, and does not work as a heat exchanger. By utilizing this fact, the number of outdoor heat exchangers to be used is controlled by the outdoor expansion valve depending on the number of operating indoor units. As a result, an outdoor heat exchanger suitable for the total capacity of the operated indoor unit is obtained. For example,
When there are two outdoor heat exchangers and the total number of indoor units is to be operated, two outdoor expansion valves are opened and two outdoor heat exchangers are installed.
Use both. When some indoor units are operated and other indoor units are stopped, one outdoor expansion valve is closed and another outdoor expansion valve is opened, and the outdoor heat exchanger is turned off.
Use only one. Similarly, even if the capacity of the connected indoor unit changes, the capacity of the outdoor heat exchanger can be adjusted by closing the outdoor expansion valve, and it is not necessary to change the outdoor unit depending on the number and capacity of the connected indoor units. A versatile outdoor unit can be provided.
室内ユニットを冷房暖房同時運転するときは、それぞ
れの四方弁を暖房モードにし、すなわち、ガス配管に圧
縮機の吐出ガス冷媒が流れるようにし、暖房運転する室
内ユニットのガス配管に設けた開閉弁を開け、圧縮機吸
入側配管への連絡管の開閉弁を閉じ、冷房運転する室内
ユニットのガス配管に設けた開閉弁を閉じ、圧縮機吸入
側配管への連絡管の開閉弁を開ける。これによって、暖
房運転の室内ユニットの熱交換器で凝縮した液冷媒は室
外ユニットと冷房運転の室内ユニットへ流れる。室外ユ
ニットおよび冷房運転の室内ユニットへ流れた液冷媒は
室外膨張弁および当該室内ユニットの室内膨張弁で減圧
され、室外熱交換器および当該室内熱交換器で空気と熱
交換され、当該室内ユニットは冷房運転となる。室外熱
交換器を出た低圧ガス冷媒は圧縮機吸入側配管を通って
圧縮機に吸入され、他方、当該室内熱交換器を出た低圧
ガス冷媒は連絡管、吸入側配管を通って圧縮機に吸入さ
れる。この熱回収サイクルによって、圧縮機は暖房に必
要な冷媒だけを供給し、冷房は暖房で得られた液冷媒を
利用することができる。これによって、圧縮機の仕事は
暖房分だけで良く、電気代が節約できる。When the indoor unit is simultaneously operated for cooling and heating, the respective four-way valves are set to the heating mode, that is, the discharge gas refrigerant of the compressor flows through the gas pipe, and the open / close valve provided in the gas pipe of the indoor unit to be heated is operated. Open, close the on-off valve of the communication pipe to the compressor suction side pipe, close the on-off valve provided on the gas pipe of the indoor unit that performs the cooling operation, and open the on-off valve of the communication pipe to the compressor suction side pipe. As a result, the liquid refrigerant condensed in the heat exchanger of the indoor unit in the heating operation flows to the outdoor unit and the indoor unit in the cooling operation. The liquid refrigerant flowing to the outdoor unit and the indoor unit in the cooling operation is decompressed by the outdoor expansion valve and the indoor expansion valve of the indoor unit, and heat-exchanges with air in the outdoor heat exchanger and the indoor heat exchanger. It becomes a cooling operation. The low-pressure gas refrigerant that has exited the outdoor heat exchanger is sucked into the compressor through a compressor suction-side pipe, while the low-pressure gas refrigerant that has exited the indoor heat exchanger passes through a communication pipe and a suction-side pipe. Inhaled. With this heat recovery cycle, the compressor supplies only the refrigerant necessary for heating, and the cooling can use the liquid refrigerant obtained by heating. As a result, the work of the compressor only needs to be performed for heating, and the electricity bill can be saved.
［実 施 例］ 本発明の一実施例を第１図、第２図により説明する。[Embodiment] An embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG.
室外ユニット１は容量制御可能な圧縮機81、四方弁61
a,61b、室外熱交換器11a,11b、流量調整可能な室外膨張
弁21a,21b、レシーバ101、アキュムレータ91および室外
ファン31で構成されている。圧縮機81の吐出管は四方弁
側で分岐され、それぞれ四方弁61a、61bの吐出ポートに
結合されている。また、吸入配管は四方弁側で分岐さ
れ、それぞれ四方弁61a,61bの吸入ポートに結合されて
いる。吸入配管の他端はアキュムレータ91を介して圧縮
機81の吸入側に結合されている。四方弁61aのＣポー
ト、室外熱交換器11a、室外膨張弁21aはそれぞれ配管で
直列に結合されている。また、四方弁61bのＣポート、
室外熱交換器11b、室外膨張弁21bも同様に直列結合さ
れ、室外膨張弁21a,21bの他端から出た配管は合流され
て、レシーバ101に入っている。レシーバ101には液管11
1も接続されている。四方弁61a,61bのＥポートからの配
管は合流されてガス配管121に接続されている。四方弁6
1a,61bは電源OFF時、吐出ポートとＣポートが、また、
吸入ポートとＥポートが連通するようになっている。ま
た、室外熱交換器は不等分割となっており、室外熱交換
器11bの方が11aより大きくなっている。室外ユニット１
から出ている液配管111およびガス配管121はそれぞれ室
内ユニットの数に分岐され、室内ユニット2,3,4に接続
されている。室内ユニット2,3,4はそれぞれ室内熱交換
器12,13,14、流量調整可能な室内膨張弁22,23,24および
室内ファン32,33,34で構成されている。それぞれの室内
熱交換器12,13,14の一端はガス配管121と結合され、他
端は室内膨張弁22,23,24と結合されている。室内膨張弁
22,23,24の他端は液配管111の分岐管と夫々結合されて
いる。The outdoor unit 1 includes a compressor 81 capable of controlling the capacity and a four-way valve 61.
a, 61b, outdoor heat exchangers 11a, 11b, outdoor expansion valves 21a, 21b capable of adjusting a flow rate, a receiver 101, an accumulator 91, and an outdoor fan 31. The discharge pipe of the compressor 81 is branched on the four-way valve side and connected to the discharge ports of the four-way valves 61a and 61b, respectively. The suction pipe branches off on the four-way valve side and is connected to the suction ports of the four-way valves 61a and 61b, respectively. The other end of the suction pipe is connected to the suction side of the compressor 81 via an accumulator 91. The C port of the four-way valve 61a, the outdoor heat exchanger 11a, and the outdoor expansion valve 21a are respectively connected in series by piping. Also, the C port of the four-way valve 61b,
Similarly, the outdoor heat exchanger 11b and the outdoor expansion valve 21b are connected in series, and the pipes coming out from the other ends of the outdoor expansion valves 21a and 21b are merged and enter the receiver 101. Liquid tube 11 for receiver 101
1 is also connected. The pipes from the E ports of the four-way valves 61a and 61b are joined and connected to the gas pipe 121. Four-way valve 6
1a and 61b are when the power is off, the discharge port and C port,
The suction port communicates with the E port. The outdoor heat exchanger is unequally divided, and the outdoor heat exchanger 11b is larger than the outdoor heat exchanger 11a. Outdoor unit 1
The liquid pipe 111 and the gas pipe 121 coming out of the apparatus are branched into the number of indoor units, respectively, and connected to the indoor units 2, 3, and 4. Each of the indoor units 2, 3, and 4 includes indoor heat exchangers 12, 13, and 14, indoor expansion valves 22, 23, and 24 capable of adjusting flow rates, and indoor fans 32, 33, and 34, respectively. One end of each of the indoor heat exchangers 12, 13, and 14 is connected to the gas pipe 121, and the other end is connected to the indoor expansion valves 22, 23, and 24. Indoor expansion valve
The other ends of 22, 23, and 24 are respectively connected to branch pipes of the liquid pipe 111.
次に、動作を第２図（ａ），（ｂ），（ｃ），（ｄ）
で説明する。なお、第２図では冷媒の流れる配管を太い
実線で示している。また、圧縮機81、四方弁61a,61b、
室外膨張弁21a,21b、室内ユニット2,3,4、および室内膨
張弁22,23,24の動作状態を第２図（ａ），（ｂ），
（ｃ），（ｄ）の各場合について第１表に示す。Next, the operation will be described with reference to FIGS. 2 (a), (b), (c) and (d).
Will be described. In FIG. 2, the pipe through which the refrigerant flows is indicated by a thick solid line. Also, the compressor 81, the four-way valves 61a, 61b,
The operation states of the outdoor expansion valves 21a, 21b, the indoor units 2, 3, 4, and the indoor expansion valves 22, 23, 24 are shown in FIGS.
Table 1 shows the cases (c) and (d).
第２図（ａ）のように室内ユニット2,3,4を全て暖房
運転するときは、四方弁61a,61bをONにし、室内膨張弁2
2,23,24を全開にし、室外膨張弁21a,21bは開度調整して
膨張弁として作動させる。圧縮機81から吐出された高圧
ガス冷媒は四方弁61a,61b、ガス配管121通って室内ユニ
ット2,3,4の室内熱交換器12,13,14に入り、室内空気と
熱交換されて液冷媒となる。このときそれぞれの室内は
暖房される。液冷媒は室内膨張弁22,23,24、液配管111
を通ってレシーバ101に入る。レシーバ101内の液冷媒は
室外膨張弁21a,21bで減圧されて室外熱交換器11a,11bに
入り、室外空気と熱交換されガス状の冷媒となり、四方
弁61a,61bおよびアキュムレータ91を通って圧縮機81に
吸入される。 When all the indoor units 2, 3, and 4 are in the heating operation as shown in FIG. 2 (a), the four-way valves 61a and 61b are turned on and the indoor expansion valve 2 is turned on.
2, 23, and 24 are fully opened, and the outdoor expansion valves 21a and 21b are adjusted in opening to operate as expansion valves. The high-pressure gas refrigerant discharged from the compressor 81 enters the indoor heat exchangers 12, 13, and 14 of the indoor units 2, 3, and 4 through the four-way valves 61a and 61b and the gas pipe 121, and exchanges heat with the indoor air to obtain a liquid. It becomes a refrigerant. At this time, each room is heated. Liquid refrigerant is indoor expansion valves 22, 23, 24, liquid piping 111
Through the receiver 101. The liquid refrigerant in the receiver 101 is decompressed by the outdoor expansion valves 21a and 21b and enters the outdoor heat exchangers 11a and 11b, exchanges heat with outdoor air to become a gaseous refrigerant, and passes through the four-way valves 61a and 61b and the accumulator 91. It is sucked into the compressor 81.
次に、第２図（ｂ）のように室内ユニット2,3の２台
を暖房運転し、室内ユニット４を停止するときは、室内
ユニット４の室内膨張弁24を全閉とし、室外膨張弁21a
も全閉にし、他は上述の第２図（ａ）のときと同じであ
る。これによって、圧縮機81から吐出された高圧ガス冷
媒は室内ユニット４を流れずに、室内ユニット2,3に流
れ、室内熱交換器12,13で室内空気と熱交換され液冷媒
となる。このとき、それぞれの室内は暖房される。液冷
媒は液配管111を通ってレシーバ101に入る。レシーバ10
1の液冷媒は室外膨張弁21bで減圧されて室外熱交換器11
bに入り、室外空気と熱交換され、ガス状の冷媒とな
り、四方弁61a、アキュムレータ91を通って圧縮機81に
吸入される。なお、室外膨張弁21aが全閉となっている
ので室外熱交換器11aには冷媒が流れない。Next, as shown in FIG. 2 (b), when the two indoor units 2 and 3 are operated for heating and the indoor unit 4 is stopped, the indoor expansion valve 24 of the indoor unit 4 is fully closed and the outdoor expansion valve is closed. 21a
Is also fully closed, and the other points are the same as those in FIG. 2A. As a result, the high-pressure gas refrigerant discharged from the compressor 81 does not flow through the indoor unit 4 but flows into the indoor units 2 and 3, and is exchanged with indoor air by the indoor heat exchangers 12 and 13 to become a liquid refrigerant. At this time, each room is heated. The liquid refrigerant enters the receiver 101 through the liquid pipe 111. Receiver 10
The liquid refrigerant of 1 is decompressed by the outdoor expansion valve 21b and is
b, heat exchange with outdoor air becomes gaseous refrigerant, and is sucked into the compressor 81 through the four-way valve 61a and the accumulator 91. Since the outdoor expansion valve 21a is fully closed, no refrigerant flows through the outdoor heat exchanger 11a.
第２図（ｃ）のように室内ユニット2,3,4を全て冷房
運転するときは四方弁61a,61bをOFFにし、室外膨張弁21
a,21bを全開にし、室内膨張弁22,23,24は開度調整して
膨張弁として作動させる。圧縮機81から吐出された高圧
ガス冷媒は四方弁61a,61bを通って室外熱交換器11a,11b
に入り、室外空気と熱交換されて液冷媒となり、室外膨
張弁21a,21bを通ってレシーバ101に入る。レシーバ101
内の液冷媒は液配管111を通って、それぞれ室内ユニッ
トに入り、それぞれの室内膨張弁22,23,24で減圧されて
室内熱交換器12,13,14に入り、室内空気と熱交換され室
内が房される。熱交換されてガス状となった冷媒はガス
配管121、四方弁61a,61bおよびアキュムレータ91を通っ
て圧縮機81に吸入される。As shown in FIG. 2 (c), when all of the indoor units 2, 3, and 4 perform the cooling operation, the four-way valves 61a and 61b are turned off, and the outdoor expansion valve 21 is turned off.
The a, 21b are fully opened, and the indoor expansion valves 22, 23, 24 are adjusted in their opening degree to operate as expansion valves. The high-pressure gas refrigerant discharged from the compressor 81 passes through the four-way valves 61a and 61b and passes through the outdoor heat exchangers 11a and 11b.
And heat exchange with the outdoor air to become a liquid refrigerant, and enters the receiver 101 through the outdoor expansion valves 21a and 21b. Receiver 101
The liquid refrigerant inside passes through the liquid pipes 111, enters the indoor units, is decompressed by the indoor expansion valves 22, 23, 24, enters the indoor heat exchangers 12, 13, 14, and exchanges heat with the indoor air. The room is tufted. The gaseous refrigerant that has undergone heat exchange is sucked into the compressor 81 through the gas pipe 121, the four-way valves 61a and 61b, and the accumulator 91.
次に、第２図（ｄ）のように、室内ユニット2,3を冷
房運転し、室内ユニット４を停止するときは室内ユニッ
ト４の室内膨張弁24を全開にし、室外膨張弁21aを少く
開く。他は上述の第２図（ｃ）のときと同じである。こ
れによって、圧縮機81から吐出された高圧ガス冷媒はほ
とんどが室外熱交換器11bへ流れ、少量だけ室外熱交換
器11aへ流れる。室外熱交換器11bへ入ったガス冷媒は室
外空気と熱交換され液冷媒となり、レシーバ101へ入
る。レシーバ101内の液冷媒は液配管11を通って案内ユ
ニット2,3へ入り、それぞれの室内膨張弁22,23で減圧さ
れて案内熱交換器12,13に入り、室内空気と熱交換さ
れ、室内が冷房される。熱交換されてガス状となった冷
媒はガス配管121、四方弁61a,61bおよびアキュムレータ
91を通って圧縮機81に吸入される。ここで、室外膨張弁
21aを少し開いて冷媒を少量流しているのは四方弁61aが
液冷媒で埋まって動作不良を起こさないようにするため
である。Next, as shown in FIG. 2D, when the indoor units 2 and 3 are operated for cooling and the indoor unit 4 is stopped, the indoor expansion valve 24 of the indoor unit 4 is fully opened and the outdoor expansion valve 21a is slightly opened. . Others are the same as those in FIG. 2 (c) described above. Thus, most of the high-pressure gas refrigerant discharged from the compressor 81 flows to the outdoor heat exchanger 11b, and a small amount flows to the outdoor heat exchanger 11a. The gas refrigerant that has entered the outdoor heat exchanger 11b undergoes heat exchange with outdoor air to become a liquid refrigerant and enters the receiver 101. The liquid refrigerant in the receiver 101 enters the guide units 2 and 3 through the liquid pipe 11, is decompressed by the respective indoor expansion valves 22 and 23, enters the guide heat exchangers 12 and 13, and exchanges heat with indoor air, The room is cooled. The gaseous refrigerant that has undergone heat exchange is supplied to the gas pipe 121, the four-way valves 61a and 61b, and the accumulator.
It is sucked into the compressor 81 through 91. Where the outdoor expansion valve
The reason why a small amount of the refrigerant is allowed to flow by slightly opening the opening 21a is to prevent the four-way valve 61a from being buried in the liquid refrigerant and causing malfunction.
本発明の他の実施例を第３図、第４図で説明する。 Another embodiment of the present invention will be described with reference to FIGS.
第３図の構成は第１図に示した構成において、室内ユ
ニット２のガス配管に開閉弁42を設け、さらに、この開
閉弁42と室内熱交換器12との間の配管と、アキュムレー
タ91入口とを、開閉弁52を備えた連絡管131で接続した
ものである。The configuration shown in FIG. 3 is different from the configuration shown in FIG. 1 in that an on-off valve 42 is provided on the gas pipe of the indoor unit 2, and a pipe between the on-off valve 42 and the indoor heat exchanger 12 and an inlet of an accumulator 91. Are connected by a communication pipe 131 provided with an on-off valve 52.
次にその動作について説明する。室内ユニット2,3,4
をすべて暖房運転し又は一部暖房運転して他は停止する
場合、あるいは、すべて冷房運転し又は一部冷房運転し
て他は停止する場合は、開閉弁42を開き、開閉弁52を閉
じることによって前述の第１図の構成と同様となるの
で、同じ動作をさせればよい。例えば、室内ユニット2,
3,4を全て暖房運転する場合、第４図（ａ）のように開
閉弁42を開き、開閉弁52を閉じ、膨張弁および四方弁を
第２図（ａ）のように動作させればよい。Next, the operation will be described. Indoor units 2, 3, 4
If all heating operation is performed or some heating operation is performed and the others are stopped, or if all the cooling operations or some cooling operations are performed and the others are stopped, the on-off valve 42 is opened and the on-off valve 52 is closed. Accordingly, the configuration is the same as that of FIG. 1 described above, and the same operation may be performed. For example, indoor unit 2,
In the case of heating operation of all 3, 4 as shown in FIG. 4 (a), the on-off valve 42 is opened, the on-off valve 52 is closed, and the expansion valve and the four-way valve are operated as shown in FIG. 2 (a). Good.
次に、室内ユニット3,4を暖房運転し、室内ユニット
２を冷房運転する場合、第４図（ｂ）のように開閉弁42
を閉じ、開閉弁52を開く。四方弁61a,61bはONし、室内
ユニット3,4の室内膨張弁23,24を全開にし、室内ユニッ
ト２の室内膨張弁22を開度調整して膨張弁として作動さ
せる。室外膨張弁21aは開度調整して膨張弁として作動
させ、室外膨張弁21bは全閉する。圧縮機81から吐出さ
れた高圧ガス冷媒は四方弁61a,61b、ガス配管121を通っ
て、室内ユニット3,4の室内熱交換器13,14へ入り、室内
空気と熱交換されて液冷媒となる。このとき、それぞれ
の室内は暖房される。液冷媒は液配管111を通ってレシ
ーバ101と室内ユニット２とへ入る。室内ユニット２へ
入った液冷媒は室内膨張弁22で減圧されて室内熱交換器
12へ入り、室内空気と熱交換される。このときその室内
は冷房される。室内熱交換器12で熱交換されたガス状の
冷媒は開閉弁52、連絡管131を通ってアキュムレータ91
へ入り、圧縮機に吸入される。また、他方、レシーバ10
1に入った液冷媒は室外膨張弁21aで減圧され、室外熱交
換器11aへ入り、室外空気と熱交換される。ここで熱交
換器されたガス状の冷媒は四方弁61aを通ってアキュム
レータに入り、圧縮機に吸入される。Next, when the indoor units 3 and 4 are operated for heating and the indoor unit 2 is operated for cooling, as shown in FIG.
Is closed, and the on-off valve 52 is opened. The four-way valves 61a and 61b are turned ON, the indoor expansion valves 23 and 24 of the indoor units 3 and 4 are fully opened, and the indoor expansion valve 22 of the indoor unit 2 is adjusted in opening to operate as an expansion valve. The outdoor expansion valve 21a is operated as an expansion valve by adjusting the opening degree, and the outdoor expansion valve 21b is fully closed. The high-pressure gas refrigerant discharged from the compressor 81 passes through the four-way valves 61a and 61b and the gas pipe 121, enters the indoor heat exchangers 13 and 14 of the indoor units 3 and 4, and is heat-exchanged with indoor air to form a liquid refrigerant. Become. At this time, each room is heated. The liquid refrigerant enters the receiver 101 and the indoor unit 2 through the liquid pipe 111. The liquid refrigerant that has entered the indoor unit 2 is decompressed by the indoor expansion valve 22 and is cooled by the indoor heat exchanger.
Enter 12 and exchange heat with indoor air. At this time, the room is cooled. The gaseous refrigerant heat-exchanged in the indoor heat exchanger 12 passes through the on-off valve 52 and the communication pipe 131, and accumulator 91.
And is sucked into the compressor. Also, on the other hand, the receiver 10
The liquid refrigerant entering 1 is decompressed by the outdoor expansion valve 21a, enters the outdoor heat exchanger 11a, and exchanges heat with outdoor air. Here, the gaseous refrigerant subjected to the heat exchanger enters the accumulator through the four-way valve 61a, and is sucked into the compressor.
室内ユニット3,4の暖房負荷と室内ユニット２の冷房
負荷がほぼ等しいときは室外膨張弁21aも全閉して室外
熱交換器21aにも冷媒を流さないようにすればよい。ま
た、室内ユニット3,4の暖房負荷が室内ユニット２の冷
房負荷より非常に大きいときは、室外膨張弁21aを全閉
して、室外膨張弁21bを開度調整して室外熱交換器11a,1
1bのうち大きさが大きい室外熱交換器11bの方を使うよ
うにすればよい。室内ユニット3,4の暖房負荷が室内ユ
ニット２の冷房負荷よりさらに大きいときは、室外膨張
弁21a,21bを開度調整して両方の室外熱交換器11a,11bを
使うようにすればよい。When the heating load of the indoor units 3 and 4 and the cooling load of the indoor unit 2 are substantially equal, the outdoor expansion valve 21a may be fully closed so that no refrigerant flows to the outdoor heat exchanger 21a. When the heating load of the indoor units 3 and 4 is much greater than the cooling load of the indoor unit 2, the outdoor expansion valve 21a is fully closed, and the outdoor expansion valve 21b is adjusted in opening to adjust the outdoor heat exchangers 11a and 11a. 1
What is necessary is just to use the larger outdoor heat exchanger 11b among 1b. When the heating load of the indoor units 3 and 4 is larger than the cooling load of the indoor unit 2, the outdoor expansion valves 21a and 21b may be adjusted to the opening degree to use both the outdoor heat exchangers 11a and 11b.
本発明のさらに他の実施例を第５図、第６図に示す。 Still another embodiment of the present invention is shown in FIGS.
第５図の構成は第１図に示した構成において、室内ユ
ニット2,3,4のガス配管にそれぞれ開閉弁42,43,44を設
け、これら開閉弁42,43,44と室内熱交換器12,13,14との
間の配管と、アキュムレータ91入口とを、開閉弁52,53,
54を備えた連絡管131で接続し、四方弁61aのＥポートと
四方弁61bのＥポートをつなぐ配管に四方弁61aから四方
弁61bへの方向の流れだけを通す逆止弁71を設け、さら
に、室外膨張弁21a,21bとレシーバ101との間の配管と、
アキュムレータ91と圧縮機81との間の配管を、流量調整
弁141を備えた液もどし配管151で接続したものである。The configuration shown in FIG. 5 is different from the configuration shown in FIG. 1 in that open / close valves 42, 43, and 44 are provided in the gas pipes of the indoor units 2, 3, and 4, respectively. The piping between 12,13,14 and the accumulator 91 inlet are connected to the on-off valves 52,53,
A check valve 71 that connects only the flow in the direction from the four-way valve 61a to the four-way valve 61b is provided in a pipe connecting the E port of the four-way valve 61a and the E port of the four-way valve 61b, connected by a communication pipe 131 having Further, piping between the outdoor expansion valves 21a, 21b and the receiver 101,
A pipe between the accumulator 91 and the compressor 81 is connected by a liquid return pipe 151 provided with a flow control valve 141.
次に動作を第６図で説明する。第６図（ａ）は室内ユ
ニット2,3を暖房運転し、室内ユニット４を停止する場
合である。四方弁61a,61bはONし、開閉弁42,43を開、開
閉弁44を閉、開閉弁52,53を閉、開閉弁54を開、室内膨
張弁22,23を全開、室内膨張弁24を全開とし、室外膨張
弁21a,21bを開度調整して膨張弁として作動させる。こ
こで、流量調整弁141を調整して、液冷媒を圧縮機81に
液もどりさせ、吐出ガス冷媒温度を制御する。なお、液
冷媒は圧縮機81の圧縮途中にもどすようにしてもよい。
他の動作および作用は第２図（ｂ）と同様である。第６
図（ａ）のように、停止している室内ユニット４を低圧
側に連通させることによって、液冷媒の停止ユニットへ
のたまりがなくなり、運転ユニットへの冷媒不足がなく
なる。第６図（ａ）で室内ユニット４も暖房運転すると
きは開閉弁44を開き、開閉弁54を閉じ、室内膨張弁24を
全開にし、室外膨張弁21aを開度調整して膨張弁として
動作させればよい。Next, the operation will be described with reference to FIG. FIG. 6A shows a case where the indoor units 2 and 3 are operated for heating and the indoor unit 4 is stopped. The four-way valves 61a and 61b are turned ON, the open / close valves 42 and 43 are opened, the open / close valves 44 are closed, the open / close valves 52 and 53 are closed, the open / close valves 54 are opened, the indoor expansion valves 22 and 23 are fully opened, and the indoor expansion valves 24 Are fully opened, and the outdoor expansion valves 21a and 21b are adjusted in their opening degrees to operate as expansion valves. Here, the flow rate adjusting valve 141 is adjusted to return the liquid refrigerant to the compressor 81 and control the temperature of the discharged gas refrigerant. Note that the liquid refrigerant may be returned during the compression of the compressor 81.
Other operations and operations are the same as those in FIG. 2 (b). Sixth
By connecting the stopped indoor unit 4 to the low-pressure side as shown in FIG. 7A, the accumulation of the liquid refrigerant in the stop unit is eliminated, and the shortage of refrigerant in the operation unit is eliminated. In FIG. 6 (a), when the indoor unit 4 also performs the heating operation, the on-off valve 44 is opened, the on-off valve 54 is closed, the indoor expansion valve 24 is fully opened, and the outdoor expansion valve 21a is adjusted in opening degree to operate as an expansion valve. It should be done.
第６図（ｂ）は全ての室内ユニット2,3,4を冷房運転
する場合である。四方弁61a、61bをOFFし、開閉弁42,4
3,44を閉、開閉弁52,53,54を開にし、室内膨張弁22,23,
24を開度調整し膨張弁として作動させる。室外膨張弁21
a,21bは全開とする。圧縮機81から吐出された高圧ガス
冷媒は四方弁61a,61bを通って室外熱交換器11a,11bに入
り、室外空気と熱交換されて液冷媒となり、レシーバ10
1へ入り、一部が液もどし配管151および流量調整弁141
を通って圧縮機81にもどる。レシーバ101内の液冷媒は
液配管111を通って室内ユニット2,3,4へ入り、室内膨張
弁22,23,24で減圧されて室内熱交換器12,13,14へ入り、
室内空気と熱交換され、室内が冷房される。このとき、
室内膨張弁22,23,24は室内熱交換器12,13,14出口の冷媒
が所定の温度過熱されるように開度調整する。室内熱交
換器12,13,14を出た冷媒は開閉弁52,53,54、連絡管131
を通ってアキュムレータ91へ入り、圧縮機81に吸入され
る。このように、室内熱交換器12,13,14の出口の冷媒の
過熱度を制御し、圧縮機81の吐出ガス冷媒温度を液もど
し配管151の流量調整弁141で調整することによって、室
内熱交換器12,13,14への冷媒の分配が適正になり、冷房
能力のアンバランスがなくなる。すなわち、液もどし配
管151及び流量調整弁141がない場合、吐出ガス冷媒温度
は室内膨張弁22,23,24で調整することになるが、室内熱
交換器12,13,14の出口の冷媒が飽和状態になるとき、そ
の温度では調整できないので吐出ガス温度を検知しなが
ら、室内膨張弁22,23,24の開度を調整する。このとき、
室内熱交換器12,13,14へ流れる冷媒量がアンバランスと
なり、ある室内熱交換器の出口の冷媒が過熱度が非常に
大きい乾き状態で、他の室内熱交換器出口の冷媒が湿り
状態となっても、吐出ガス冷媒は調整できるが、このよ
うな場合、各室内ユニット2,3,4の冷房能力はアンバラ
ンスとなっている。室内膨張弁22,23,24を室内熱交換器
12,13,14の出口の冷媒が所定の過熱度となるように制御
すれば上記のようなアンバランスは解消できる。FIG. 6 (b) shows a case where all the indoor units 2, 3, 4 are operated for cooling. Turn off the four-way valves 61a and 61b, and open and close
3,44 closed, open / close valves 52,53,54, indoor expansion valves 22,23,
Adjust the opening of 24 and operate as expansion valve. Outdoor expansion valve 21
a and 21b are fully open. The high-pressure gas refrigerant discharged from the compressor 81 passes through the four-way valves 61a and 61b, enters the outdoor heat exchangers 11a and 11b, undergoes heat exchange with outdoor air to become a liquid refrigerant, and
1 and a part of the liquid return pipe 151 and the flow control valve 141
And returns to the compressor 81. The liquid refrigerant in the receiver 101 enters the indoor units 2, 3, and 4 through the liquid pipe 111, is decompressed by the indoor expansion valves 22, 23, and 24, and enters the indoor heat exchangers 12, 13, and 14,
Heat is exchanged with the indoor air to cool the room. At this time,
The degree of opening of the indoor expansion valves 22, 23, and 24 is adjusted so that the refrigerant at the outlets of the indoor heat exchangers 12, 13, and 14 is heated to a predetermined temperature. Refrigerant that has exited the indoor heat exchangers 12, 13, 14 is turned on / off valves 52, 53, 54, and the connecting pipe 131.
Through the accumulator 91 and is sucked into the compressor 81. In this way, by controlling the degree of superheat of the refrigerant at the outlets of the indoor heat exchangers 12, 13, and 14, and adjusting the temperature of the discharge gas refrigerant from the compressor 81 by the flow control valve 141 of the liquid return pipe 151, the indoor heat The distribution of the refrigerant to the exchangers 12, 13, 14 becomes proper, and the imbalance in the cooling capacity is eliminated. That is, when there is no liquid return pipe 151 and the flow rate adjustment valve 141, the discharge gas refrigerant temperature is adjusted by the indoor expansion valves 22, 23, and 24, but the refrigerant at the outlets of the indoor heat exchangers 12, 13, and 14 is not When the saturated state is reached, since the temperature cannot be adjusted at that temperature, the opening degrees of the indoor expansion valves 22, 23, and 24 are adjusted while detecting the discharge gas temperature. At this time,
The amount of refrigerant flowing to the indoor heat exchangers 12, 13, 14 is unbalanced, the refrigerant at the outlet of one indoor heat exchanger is in a dry state with a very large degree of superheat, and the refrigerant at the outlet of another indoor heat exchanger is in a wet state , The discharged gas refrigerant can be adjusted, but in such a case, the cooling capacity of each of the indoor units 2, 3, and 4 is unbalanced. Use indoor expansion valves 22, 23, 24 as indoor heat exchangers
If the refrigerant at the outlets 12, 13, and 14 is controlled to have a predetermined degree of superheat, the above imbalance can be resolved.
第６図（ｃ）は室内ユニット２を冷房運転し、室内ユ
ニット3,4を暖房運転する場合である。四方弁61aをOF
F、四方弁61bをONにし、開閉弁42を閉、開閉弁43,44を
開、開閉弁52を開、開閉弁53,54を閉にし、室内膨張弁2
2は開度調整して膨張弁として作動させる。室内膨張弁2
3,24は全開とする。室外膨張弁21aは少し開き、室外膨
張弁21bは開度調整して膨張弁として作動させる。圧縮
機81から吐出された高圧ガス冷媒は四方弁61b、ガス配
管121、開閉弁43,44を通って、室内熱交換器13,14へ入
り、室内空気と熱交換され液溶媒となる。このとき、そ
れぞれの室内が暖房される。液冷媒は室内膨張弁23,24
を通って室内ユニット２と液配管111とへ分流される。
室内ユニット２へ入った液冷媒は室内膨張弁22で減圧さ
れて室内熱交換器12へ入り、室内空気と熱交換され、そ
の室内が冷房される。室内熱交換器12を出た冷媒は開閉
弁52、連絡管131を通ってアキュムレータ91に入り、圧
縮機81に吸入される。液配管111の液冷媒はレシーバ101
へ入り、一部が液もどし配管15および流量調整弁141に
流れ、圧縮機81の吐出ガス冷媒温度制御に使われ、他が
室外膨張弁21bで減圧され、室外熱交換器11bで室外空気
と熱交換され、四方弁61bを通ってアキュムレータ91へ
入り、圧縮機81に吸入される。ここで、室外膨張弁21a
が少し開いているので、室外熱交換器11a内にたまって
いる液冷媒が四方弁61aまで埋めることはない。FIG. 6C shows a case where the indoor unit 2 is operated for cooling and the indoor units 3 and 4 are operated for heating. OF 4-way valve 61a
F, turn on the four-way valve 61b, close the on-off valve 42, open the on-off valves 43 and 44, open the on-off valves 52, close the on-off valves 53 and 54, and turn on the indoor expansion valve 2.
2 adjusts the opening and operates as an expansion valve. Indoor expansion valve 2
3, 24 are fully open. The outdoor expansion valve 21a is slightly opened, and the outdoor expansion valve 21b is adjusted in its opening degree to operate as an expansion valve. The high-pressure gas refrigerant discharged from the compressor 81 passes through the four-way valve 61b, the gas pipe 121, and the on-off valves 43 and 44, enters the indoor heat exchangers 13 and 14, and exchanges heat with indoor air to become a liquid solvent. At this time, each room is heated. Liquid refrigerant is indoor expansion valve 23, 24
Then, the liquid is divided into the indoor unit 2 and the liquid pipe 111.
The liquid refrigerant that has entered the indoor unit 2 is decompressed by the indoor expansion valve 22 and enters the indoor heat exchanger 12, where it exchanges heat with indoor air to cool the room. The refrigerant that has exited the indoor heat exchanger 12 enters the accumulator 91 through the on-off valve 52 and the communication pipe 131, and is drawn into the compressor 81. The liquid refrigerant in the liquid pipe 111 is the receiver 101
And a part thereof flows into the liquid return pipe 15 and the flow control valve 141, is used for controlling the temperature of the discharged gas refrigerant of the compressor 81, and the other is depressurized by the outdoor expansion valve 21b, and is separated from the outdoor air by the outdoor heat exchanger 11b. The heat is exchanged, enters the accumulator 91 through the four-way valve 61b, and is sucked into the compressor 81. Here, the outdoor expansion valve 21a
Is slightly open, so that the liquid refrigerant accumulated in the outdoor heat exchanger 11a does not fill up to the four-way valve 61a.
第６図（ｄ）は室内ユニット2,3を冷房運転し、室内
ユニット４を暖房運転する場合である。第６図（ｃ）と
同じように四方弁61aをOFF、四方弁61bをONにする。開
閉弁42,43を閉、開閉弁44を開、開閉弁52,53を開、開閉
弁54を閉にし、室内膨張弁22,23は開度調整して膨張弁
として作動させる。室内膨張弁24は全開にする。室外膨
張弁21aは全開、室外膨張弁21bは全閉にする。圧縮機81
から吐出された高圧ガス冷媒は、四方弁61aを通って室
外熱交換器11aに、また四方弁61bを通ってガス配管121
に分流される。室外熱交換器11aへ入った冷媒は室外空
気と熱交換され、液冷媒となって室外膨張弁21aを通っ
てレシーバ101へ入る。このとき、一部の液冷媒は液も
どし配管151および流量調整弁141を通って圧縮機81へ入
り、吐出ガス冷媒温度の制御に使われる。レシーバ101
内の液冷媒は配管111を通って室内ユニット側へ流れ
る。ガス配管121の高圧ガス冷媒は開閉弁44を通って室
内ユニット４の室内熱交換器14へ入り、室内空気と熱交
換され液冷媒となる。このとき、その室内は暖房され
る。室内熱交換器14内の液冷媒は室内膨張弁24を通っ
て、前述の液配管111の液冷媒と合流し、室内ユニット
2,3へ入り、室内膨張弁22、23で減圧されて室内熱交換
器12,13へ入り、室内空気と熱交換されて、それぞれの
室内が冷房される。室内熱交換器12,13を出た冷媒は開
閉弁52,53、連絡管131を通ってアキュムレータ91へ入
り、圧縮機81に吸入される。FIG. 6D shows a case where the indoor units 2 and 3 are operated for cooling and the indoor unit 4 is operated for heating. The four-way valve 61a is turned off and the four-way valve 61b is turned on as in FIG. 6 (c). The on-off valves 42 and 43 are closed, the on-off valves 44 are opened, the on-off valves 52 and 53 are opened, the on-off valves 54 are closed, and the indoor expansion valves 22 and 23 are adjusted in opening degree to operate as expansion valves. The indoor expansion valve 24 is fully opened. The outdoor expansion valve 21a is fully opened, and the outdoor expansion valve 21b is fully closed. Compressor 81
The high-pressure gas refrigerant discharged from the gas pipe 121 passes through the four-way valve 61a to the outdoor heat exchanger 11a, and passes through the four-way valve 61b.
Shunted. The refrigerant that has entered the outdoor heat exchanger 11a undergoes heat exchange with outdoor air, becomes liquid refrigerant, and enters the receiver 101 through the outdoor expansion valve 21a. At this time, a part of the liquid refrigerant enters the compressor 81 through the liquid return pipe 151 and the flow control valve 141, and is used for controlling the temperature of the discharged gas refrigerant. Receiver 101
The liquid refrigerant inside flows through the pipe 111 to the indoor unit side. The high-pressure gas refrigerant in the gas pipe 121 passes through the on-off valve 44 and enters the indoor heat exchanger 14 of the indoor unit 4, where it exchanges heat with indoor air to become a liquid refrigerant. At this time, the room is heated. The liquid refrigerant in the indoor heat exchanger 14 passes through the indoor expansion valve 24, merges with the liquid refrigerant in the liquid pipe 111, and
After entering the rooms 2 and 3, the pressure is reduced by the indoor expansion valves 22 and 23 and the indoor heat exchangers 12 and 13 are exchanged with the indoor air to be cooled. The refrigerant that has exited the indoor heat exchangers 12 and 13 enters the accumulator 91 through the on-off valves 52 and 53 and the communication pipe 131, and is sucked into the compressor 81.
［発明の効果］ 本発明は、以上説明したように構成されているので下
記のような効果がある。[Effects of the Invention] The present invention is configured as described above and has the following effects.
室外熱交換器を複数台備え、それぞれに開度調整可能
な室外膨張弁を設け、室内ユニットの運転台数によっ
て、使用する室外熱交換器の数を調整し、室内ユニット
の容量に合った室外熱交換器容量が得られ、汎用性のあ
る室外ユニットとなる。Equipped with a plurality of outdoor heat exchangers, each with an outdoor expansion valve whose opening can be adjusted, the number of outdoor heat exchangers to be used is adjusted according to the number of operating indoor units, and the outdoor heat is adjusted to the capacity of the indoor unit. The capacity of the exchanger is obtained, and it becomes a versatile outdoor unit.
また、室内ユニットのガス配管に開閉弁を設け、前記
室内ユニットと開閉弁との間の配管と圧縮機吸入側とを
開閉弁を備えた連絡管で接続することによって、冷房と
暖房を同時運転するとき、熱回収サイクルとなり、圧縮
機の仕事は冷媒能力又は暖房能力の大きい方だけでよ
く、電気代の節約ができる。Further, an on-off valve is provided in the gas pipe of the indoor unit, and the piping between the indoor unit and the on-off valve and the compressor suction side are connected by a communication pipe having the on-off valve, thereby simultaneously operating the cooling and the heating. In this case, a heat recovery cycle is performed, and the work of the compressor only needs to be performed with the larger refrigerant capacity or the larger heating capacity, thereby saving electricity bills.
第１図は本発明の一実施例の冷凍サイクルの構成図、第
２図（ａ），（ｂ），（ｃ），（ｄ）は第１図の実施例
の動作説明図、第３図は他の実施例の冷凍サイクルの構
成図、第４図（ａ），（ｂ）は第３図の実施例の動作説
明図、第５図はさらに他の実施例の冷凍サイクルの構成
図、第６図（ａ），（ｂ），（ｃ），（ｄ）は第５図の
実施例の動作説明図である。 １……室外ユニット、2,3,4……室内ユニット 11a,11b……室外熱交換器 12,13,14……室内熱交換器 21a,21b……室外膨張弁 22,23,24……室内膨張弁 42,43,44,52,53,54……開閉弁 61a,61b……四方弁 71……逆止弁、81……圧縮機 111……液配管、121……ガス配管 131……連絡管FIG. 1 is a block diagram of a refrigeration cycle according to one embodiment of the present invention, FIGS. 2 (a), (b), (c) and (d) are explanatory diagrams of the operation of the embodiment of FIG. 1, and FIG. FIG. 4 is a configuration diagram of a refrigeration cycle of another embodiment, FIGS. 4 (a) and (b) are operation explanatory diagrams of the embodiment of FIG. 3, FIG. 5 is a configuration diagram of a refrigeration cycle of still another embodiment, 6 (a), (b), (c) and (d) are diagrams for explaining the operation of the embodiment of FIG. 1… Outdoor unit, 2,3,4… Indoor unit 11a, 11b… Outdoor heat exchanger 12,13,14 …… Indoor heat exchanger 21a, 21b …… Outdoor expansion valve 22,23,24 …… Indoor expansion valves 42, 43, 44, 52, 53, 54 ... On-off valves 61a, 61b ... Four-way valves 71 ... Check valves, 81 ... Compressor 111 ... Liquid piping, 121 ... Gas piping 131 ... … Communication pipe
───────────────────────────────────────────────────── フロントページの続き (72)発明者 南方 留美 茨城県土浦市神立町502番地 株式会社 日立製作所機械研究所内 (72)発明者 浦田 和幹 茨城県土浦市神立町502番地 株式会社 日立製作所機械研究所内 (72)発明者 村松 正敏 茨城県土浦市神立町502番地 株式会社 日立製作所機械研究所内 (72)発明者 戸草 健治 静岡県清水市村松390番地 株式会社日 立製作所清水工場内 (72)発明者 千秋 隆雄 静岡県清水市村松390番地 株式会社日 立製作所清水工場内 (72)発明者 寺田 浩清 静岡県清水市村松390番地 株式会社日 立製作所清水工場内 (72)発明者 木谷 文彦 静岡県清水市村松390番地 株式会社日 立製作所清水工場内 (56)参考文献 特開 昭55−165455（ＪＰ，Ａ) 特開 昭54−28048（ＪＰ，Ａ) 実開 昭56−47446（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) F25B 13/00 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Rumi Minamikata, 502 Kandate-cho, Tsuchiura-city, Ibaraki Prefecture Inside Machinery Research Laboratory, Hitachi, Ltd. (72) Kazuki Urata 502-Kindachi-cho, Tsuchiura-shi, Ibaraki Machinery, Hitachi, Ltd. In the laboratory (72) Inventor Masatoshi Muramatsu 502 Kandachi-cho, Tsuchiura-city, Ibaraki Pref.Hitachi Machinery Research Institute, Inc. (72) Inventor Kenji Togusa 390 Muramatsu, Shimizu-shi, Shizuoka Pref. Inventor Takao Chiaki 390 Muramatsu, Shimizu-shi, Shizuoka Prefecture Inside Shimizu Plant, Hitachi Ltd. (72) Inventor Hiroki Terada 390 Muramatsu, Shimizu-shi, Shizuoka Prefecture Inside Shimizu Plant, Hitachi Ltd. (72) Inventor Fumihiko Kitani Shizuoka Kitani 390 Muramatsu, Shimizu-shi, Pref. Inside the Shimizu Plant of Hitachi Ltd. (56) References JP-A-55-165455 (JP) A) Patent Akira 54-28048 (JP, A) JitsuHiraku Akira 56-47446 (JP, U) (58 ) investigated the field (Int.Cl. 6, DB name) F25B 13/00
Claims (4)
を接続すると共に、該各四方弁には１台の圧縮機の吐出
側配管及び吸入側配管を夫々分岐して接続し、 上記各室外熱交換機の各他端に夫々流量調整可能な室外
膨張弁を接続し、該各室外膨張弁には液配管の１端を分
岐して夫々接続すると共に、該液配管の他端を分岐して
複数の室内熱交換器の夫々の１端に夫々流量調整可能な
室内膨張弁を介して接続し、 上記室内熱交換器の各他端にはガス配管の１端を分岐し
て夫々接続すると共に、該ガス配管の他端を分岐して上
記四方弁に夫々接続したことを特徴とするマルチ空気調
和機。1. A four-way valve is connected to each one end of a plurality of outdoor heat exchangers, and a discharge-side pipe and a suction-side pipe of one compressor are branched and connected to each of the four-way valves. An outdoor expansion valve capable of adjusting a flow rate is connected to each other end of each of the outdoor heat exchangers, and one end of a liquid pipe is branched and connected to each outdoor expansion valve, and the other end of the liquid pipe is connected to each other. And connected to one end of each of the plurality of indoor heat exchangers via an indoor expansion valve capable of adjusting a flow rate. One end of a gas pipe is branched to each other end of the indoor heat exchanger. A multi-air conditioner, wherein each of the gas pipes is connected, and the other end of the gas pipe is branched and connected to the four-way valve.
ガス配管の各々または少なくとも１本に開閉弁を設け、
該開閉弁と前記室内熱交換器との間のガス配管と前記圧
縮機の吸入側配管とは上記開閉弁に夫々対応する開閉弁
を介装した連絡管により接続されていることを特徴とす
る請求項１記載のマルチ空気調和機。2. An on-off valve is provided in each or at least one of said gas pipes branched and connected to each of said indoor heat exchangers,
A gas pipe between the on-off valve and the indoor heat exchanger and a suction-side pipe of the compressor are connected by connecting pipes having on-off valves respectively corresponding to the on-off valves. The multi-type air conditioner according to claim 1.
管とを流量調整弁を介装した液戻し配管により接続した
ことを特徴とする請求項２記載のマルチ空気調和機。3. The multi-air conditioner according to claim 2, wherein a middle of the liquid pipe and a suction side pipe of the compressor are connected by a liquid return pipe provided with a flow control valve.
中に、前記四方弁から前記ガス配管の分岐点への方向の
流れだけを通す逆止弁を設けたことを特徴とする請求項
２又は３記載のマルチ空気調和機。4. A non-return valve for passing only a flow in a direction from the four-way valve to a branch point of the gas pipe is provided in the gas pipe branched and connected to the four-way valve. 4. The multi-type air conditioner according to 2 or 3.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1211937A JP2975612B2 (en) | 1989-08-17 | 1989-08-17 | Multi air conditioner |
| US07/564,608 US5065588A (en) | 1989-08-17 | 1990-08-09 | Air-conditioner system |
| DE4025628A DE4025628A1 (en) | 1989-08-17 | 1990-08-13 | AIR CONDITIONER |
| KR1019900012627A KR930009564B1 (en) | 1989-08-17 | 1990-08-17 | Air donditioner system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1211937A JP2975612B2 (en) | 1989-08-17 | 1989-08-17 | Multi air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0375459A JPH0375459A (en) | 1991-03-29 |
| JP2975612B2 true JP2975612B2 (en) | 1999-11-10 |
Family
ID=16614154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1211937A Expired - Lifetime JP2975612B2 (en) | 1989-08-17 | 1989-08-17 | Multi air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2975612B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170010027A1 (en) * | 2014-01-27 | 2017-01-12 | Qingdao Hisense Hitachi Air-Conditionung Systems Co., Ltd | Heat recovery variable-frequency multi-split heat pump system and control method thereof |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2511807Y2 (en) * | 1993-06-11 | 1996-09-25 | 若井産業株式会社 | Parts feeder |
| US11371755B2 (en) * | 2017-09-15 | 2022-06-28 | Mitsubishi Electric Corporation | Air-conditioning apparatus |
| CN109237644B (en) * | 2018-10-16 | 2023-09-05 | 珠海格力电器股份有限公司 | Heat pump unit and control method thereof |
| CN111795481B (en) * | 2019-04-08 | 2023-05-23 | 开利公司 | Air conditioning system and control method therefor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS587148B2 (en) * | 1977-08-02 | 1983-02-08 | ダイキン工業株式会社 | air conditioner |
| JPS55165455A (en) * | 1979-06-08 | 1980-12-23 | Matsushita Electric Ind Co Ltd | Air conditioner |
| JPS6021718Y2 (en) * | 1979-09-20 | 1985-06-28 | 三洋電機株式会社 | air conditioner |
-
1989
- 1989-08-17 JP JP1211937A patent/JP2975612B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170010027A1 (en) * | 2014-01-27 | 2017-01-12 | Qingdao Hisense Hitachi Air-Conditionung Systems Co., Ltd | Heat recovery variable-frequency multi-split heat pump system and control method thereof |
| US10132530B2 (en) * | 2014-01-27 | 2018-11-20 | Qingdao Hisense Hitachi Air-conditioning Systems Co., Ltd. | Heat recovery variable-frequency multi-split heat pump system and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0375459A (en) | 1991-03-29 |
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