JPH05215428A - Multi-room air conditioner - Google Patents
Multi-room air conditionerInfo
- Publication number
- JPH05215428A JPH05215428A JP1865892A JP1865892A JPH05215428A JP H05215428 A JPH05215428 A JP H05215428A JP 1865892 A JP1865892 A JP 1865892A JP 1865892 A JP1865892 A JP 1865892A JP H05215428 A JPH05215428 A JP H05215428A
- Authority
- JP
- Japan
- Prior art keywords
- way valve
- outdoor
- indoor
- heat exchanger
- valve
- 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
Landscapes
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は多室型空気調和機に係わ
り、特に各室内機毎に自由に冷暖房が選択可能な多室型
空気調和機の冷凍サイクルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-room air conditioner, and more particularly to a refrigerating cycle of a multi-room air conditioner in which cooling and heating can be freely selected for each indoor unit.
【０００２】[0002]
【従来の技術】従来、この種の多室型空気調和機とし
て、例えば、特開平２−９７８５８号公報に掲載された
ものがある。2. Description of the Related Art Conventionally, as a multi-room type air conditioner of this type, for example, there is one disclosed in Japanese Unexamined Patent Publication No. 2-97858.
【０００３】以下、図面を参照しながら上述した公報の
従来の多室型空気調和機について説明する。The conventional multi-room air conditioner of the above-mentioned publication will be described below with reference to the drawings.
【０００４】図１０において、１は多室型空気調和機の
室外機であり、圧縮機２、三方切換機構としての三方弁
３、室外側熱交換器４、室外側膨張弁５から成ってい
る。６は室内機であり、室内側膨張弁７、室内側熱交換
器８、高圧側二方弁９、低圧側二方弁１０から成ってい
る。In FIG. 10, reference numeral 1 is an outdoor unit of a multi-room air conditioner, which comprises a compressor 2, a three-way valve 3 as a three-way switching mechanism, an outdoor heat exchanger 4, and an outdoor expansion valve 5. .. An indoor unit 6 is composed of an indoor expansion valve 7, an indoor heat exchanger 8, a high pressure two-way valve 9, and a low pressure two-way valve 10.
【０００５】そして室内側熱交換器８の一方は、高圧側
二方弁９を介して室外機１の高圧側と室内機６を接続す
る高圧ガス管１１と連通するとともに、低圧側二方弁１
０を介して室外機１の低圧側と室内機６を接続する低圧
ガス管１２と連通しており、高圧側二方弁９と低圧側二
方弁１０の開閉により、室内側熱交換器８の一方は、高
圧ガス管１１または低圧ガス管１２と切替可能に接続さ
れている。One of the indoor heat exchangers 8 communicates with a high-pressure gas pipe 11 connecting the high-pressure side of the outdoor unit 1 and the indoor unit 6 via a high-pressure two-way valve 9, and a low-pressure two-way valve. 1
The low pressure side of the outdoor unit 1 communicates with the low pressure gas pipe 12 connecting the indoor unit 6 via 0, and the high pressure side two-way valve 9 and the low pressure side two-way valve 10 are opened and closed to open the indoor heat exchanger 8 One of them is switchably connected to the high pressure gas pipe 11 or the low pressure gas pipe 12.
【０００６】また室内側熱交換器８の他方は、室内側膨
張弁７を介して室外機１の液管部と室内機６を液管１３
で接続されている。尚、室内機６は本従来例では３台接
続されており、区別する場合は添字ａ、ｂ、ｃを付ける
ことにする。The other of the indoor heat exchangers 8 connects the liquid pipe portion of the outdoor unit 1 and the indoor unit 6 to the liquid pipe 13 via the indoor expansion valve 7.
Connected by. It should be noted that three indoor units 6 are connected in this conventional example, and the subscripts a, b, and c are added to distinguish them.
【０００７】次に上記構成の多室型空気調和機の動作に
ついて説明する。まず冷房運転のみの場合について説明
する。この場合の冷媒の流れは実線矢印で表わし、各弁
の開閉状態は次の通りである。即ち、高圧側二方弁９は
閉、低圧側二方弁１０は開、各室内側膨張弁７は各室内
負荷に応じた開度である。Next, the operation of the multi-room air conditioner having the above structure will be described. First, the case of only the cooling operation will be described. The flow of the refrigerant in this case is represented by a solid arrow, and the open / closed state of each valve is as follows. That is, the high-pressure two-way valve 9 is closed, the low-pressure two-way valve 10 is open, and each indoor expansion valve 7 has an opening degree according to each indoor load.
【０００８】圧縮機２より吐出された冷媒は、三方弁３
を介し室外側熱交換器４で凝縮液化され、室外側膨張弁
５を通って液管１３に導かれる。そして室内側膨張弁７
を通って各室内側熱交換器８に流入し、それぞれ蒸発気
化したあと、低圧側二方弁１０を経て低圧ガス管１２に
導かれる。その後圧縮機２に戻り、冷房運転を行なう。The refrigerant discharged from the compressor 2 is a three-way valve 3
Is condensed and liquefied in the outdoor heat exchanger 4 through the, and guided to the liquid pipe 13 through the outdoor expansion valve 5. And the indoor expansion valve 7
Through each of the indoor heat exchangers 8 and is vaporized and vaporized, and then introduced into the low pressure gas pipe 12 through the low pressure two-way valve 10. Then, it returns to the compressor 2 and performs a cooling operation.
【０００９】次に暖房運転のみの場合について説明す
る。この場合の冷媒の流れは破線矢印で表わし、各弁の
開閉状態は次の通りである。即ち、高圧側二方弁９は
開、低圧側二方弁１０は閉、各室内側膨張弁７は各室内
負荷に応じた開度である。Next, the case of only the heating operation will be described. The flow of the refrigerant in this case is indicated by a dashed arrow, and the open / closed state of each valve is as follows. That is, the high-pressure two-way valve 9 is open, the low-pressure two-way valve 10 is closed, and each indoor expansion valve 7 has an opening degree according to each indoor load.
【００１０】圧縮機２より吐出された冷媒は、高圧ガス
管１１、高圧側二方弁９を介して各室内側熱交換器８に
導かれ、ここで凝縮液化して室内側膨張弁７を介して液
管１３に流入し、室外側膨張弁５で低圧二相状態まで減
圧され、室外側熱交換器４に入り蒸発気化する。その後
三方弁３を介して圧縮機２に戻り、暖房運転を行なう。The refrigerant discharged from the compressor 2 is guided to each indoor heat exchanger 8 via a high pressure gas pipe 11 and a high pressure two-way valve 9, where it is condensed and liquefied to the indoor expansion valve 7. It flows into the liquid pipe 13 through the outside, is decompressed to the low pressure two-phase state by the outdoor expansion valve 5, enters the outdoor heat exchanger 4, and is evaporated and vaporized. After that, it returns to the compressor 2 via the three-way valve 3 to perform the heating operation.
【００１１】次に冷房主体運転の場合について図１１を
用いて説明する。ここで各室内機６の運転状態は、室内
機６ａ，６ｂ…冷房、室内機６ｃ…暖房とし、各弁の開
閉状態は次の通りである。即ち、高圧側二方弁９ａ，９
ｂは閉、高圧側二方弁９ｃは開、低圧側二方弁１０ａ，
１０ｂは開、低圧側二方弁１０ｃは閉、各室内側膨張弁
７は各室内負荷に応じた開度である。Next, the case of the cooling main operation will be described with reference to FIG. Here, the operating state of each indoor unit 6 is indoor unit 6a, 6b ... Cooling, indoor unit 6c ... Heating, and the open / closed state of each valve is as follows. That is, the high pressure side two-way valves 9a, 9
b is closed, the high pressure side two-way valve 9c is open, the low pressure side two-way valve 10a,
10b is open, the low pressure side two-way valve 10c is closed, and each indoor expansion valve 7 has an opening degree according to each indoor load.
【００１２】圧縮機２より吐出された一部の冷媒は、三
方弁３を介し室外側熱交換器４で凝縮液化され、室外側
膨張弁５を通って液管１３に導かれる。また残りの冷媒
は、高圧ガス管１１、高圧側二方弁９ｃを介して室内側
熱交換器６ｃに導かれ、ここで凝縮液化して室内側膨張
弁７ｃを介して液管１３に流入し、室外側熱交換器４を
通ってきた冷媒と合流する。そして室内側膨張弁７ａ，
７ｂを通って室内側熱交換器８ａ，８ｂに流入し、それ
ぞれ蒸発気化したあと、低圧側二方弁１０ａ，１０ｂを
経て低圧ガス管１２に導かれる。その後圧縮機２に戻
り、冷房主体運転を行なう。A part of the refrigerant discharged from the compressor 2 is condensed and liquefied by the outdoor heat exchanger 4 via the three-way valve 3, and is guided to the liquid pipe 13 through the outdoor expansion valve 5. The remaining refrigerant is guided to the indoor heat exchanger 6c through the high pressure gas pipe 11 and the high pressure side two-way valve 9c, where it is condensed and liquefied and flows into the liquid pipe 13 through the indoor expansion valve 7c. , Joins the refrigerant having passed through the outdoor heat exchanger 4. And the indoor expansion valve 7a,
After passing through 7b into the indoor heat exchangers 8a and 8b and evaporating and vaporizing respectively, they are guided to the low pressure gas pipe 12 through the low pressure two-way valves 10a and 10b. Then, it returns to the compressor 2 and performs a cooling main operation.
【００１３】次に暖房主体運転の場合について図１２を
用いて説明する。ここで各室内機６の運転状態は、室内
機６ａ，６ｂ…暖房、室内機６ｃ…冷房とし、各弁の開
閉状態は次の通りである。即ち、高圧側二方弁９ａ，９
ｂは開、高圧側二方弁９ｃは閉、低圧側二方弁１０ａ，
１０ｂは閉、低圧側二方弁１０ｃは開、各室内側膨張弁
７は各室内負荷に応じた開度である。Next, the case of heating-main operation will be described with reference to FIG. Here, the operating state of each indoor unit 6 is indoor unit 6a, 6b ... Heating, indoor unit 6c ... Cooling, and the opening / closing state of each valve is as follows. That is, the high pressure side two-way valves 9a, 9
b is open, the high pressure side two-way valve 9c is closed, the low pressure side two-way valve 10a,
10b is closed, the low pressure side two-way valve 10c is open, and each indoor expansion valve 7 has an opening degree according to each indoor load.
【００１４】圧縮機２より吐出された冷媒は、高圧ガス
管１１、高圧側二方弁９ａ，９ｂを介して室内側熱交換
器８ａ，８ｂに導かれ、ここで凝縮液化して室内側膨張
弁７ａ，７ｂを介して液管１３に流入する。液管１３の
一部の冷媒は、室内側膨張弁７ｃを通って室内側熱交換
器８ｃに流入し、それぞれ蒸発気化したあと、低圧側二
方弁１０ｃを経て低圧ガス管１２に流入する。残りの冷
媒は、室外側膨張弁５で低圧二相状態まで減圧され、室
外側熱交換器４に入り蒸発気化する。その後三方弁３を
介し低圧ガス管１２に流入し、低圧側二方弁１０ｃを通
った冷媒と合流した後圧縮機２に戻り、暖房主体運転を
行なう。The refrigerant discharged from the compressor 2 is guided to the indoor heat exchangers 8a and 8b through the high pressure gas pipe 11 and the high pressure two-way valves 9a and 9b, where it is condensed and liquefied and expanded indoors. It flows into the liquid pipe 13 via the valves 7a and 7b. A part of the refrigerant in the liquid pipe 13 flows into the indoor heat exchanger 8c through the indoor expansion valve 7c, is vaporized and evaporated, and then flows into the low pressure gas pipe 12 through the low pressure two-way valve 10c. The remaining refrigerant is decompressed by the outdoor expansion valve 5 to a low pressure two-phase state, enters the outdoor heat exchanger 4, and is evaporated and vaporized. After that, it flows into the low-pressure gas pipe 12 via the three-way valve 3, merges with the refrigerant passing through the low-pressure two-way valve 10c, and then returns to the compressor 2 to perform the heating-main operation.
【００１５】[0015]
【発明が解決しようとする課題】しかしながら上記のよ
うな構成では、冷房小容量運転（例えば２９．１ｋＷの
室外機に対して２．３ｋＷの室内機運転）の場合、圧縮
機の最小能力（５．８ｋＷ相当）に比べ蒸発能力２．３
ｋＷと小さく凝縮能力は２９．１ｋＷと大きい為、凝縮
圧力が極端に低下する。また、暖房小容量運転（例えば
２９．１ｋＷの室外機に対して２．３ｋＷの室内機運
転）の場合、圧縮機の最小能力（５．８ｋＷ相当）に比
べ凝縮能力２．３ｋＷと小さく蒸発能力は２９．１ｋＷ
と大きい為、凝縮圧力が極端に上昇する。このように冷
房小容量運転、暖房小容量運転時に凝縮圧力が極端に上
昇したり極端に低下し、圧縮機の信頼性や安定なシステ
ムの運転状態を脅かすという欠点を有していた。However, in the above configuration, in the case of the cooling small capacity operation (for example, the indoor unit operation of 2.3 kW with respect to the outdoor unit of 29.1 kW), the minimum capacity of the compressor (5 Equivalent to 2.3 kW)
Since it is as small as kW and the condensing capacity is as large as 29.1 kW, the condensing pressure is extremely lowered. In addition, in the case of small heating capacity operation (for example, indoor unit operation of 2.3 kW for outdoor unit of 29.1 kW), the condensation capacity is 2.3 kW, which is smaller than the minimum capacity of the compressor (equivalent to 5.8 kW), and the evaporation capacity is smaller. Is 29.1 kW
Therefore, the condensing pressure rises extremely. As described above, the condensing pressure extremely rises or falls during the cooling small capacity operation and the heating small capacity operation, which has a drawback that the reliability of the compressor and the stable operating state of the system are threatened.
【００１６】本発明は上記課題に鑑みなされたもので、
安価な仕様で室内機の運転状態に応じて蒸発能力、凝縮
能力を制御し、圧縮機の信頼性や安定なシステムの運転
状態を確保するとともに、各室内機毎に自由に冷暖房が
できる多室型空気調和機を提供するものである。The present invention has been made in view of the above problems.
It is an inexpensive specification that controls the evaporation capacity and condensation capacity according to the operating condition of the indoor unit to ensure the reliability of the compressor and the stable operating condition of the system, and it is possible to freely cool and heat each indoor unit. A type air conditioner is provided.
【００１７】本発明の他の目的は、四方弁の動作不良を
防止し、常に安定なシステムの運転状態を確保するもの
である。Another object of the present invention is to prevent malfunction of the four-way valve and to always ensure a stable operating state of the system.
【００１８】[0018]
【課題を解決するための手段】上記課題を解決するため
に本発明は、圧縮機、四方弁、第１の室外側熱交換器、
第２の室外側熱交換器、第１の室外側膨張弁、第２の室
外側膨張弁、第１の室外側二方弁、第２の室外側二方弁
とから成る室外機と、室内側膨張弁、室内側熱交換器と
から成る複数の室内機を高圧ガス管、低圧ガス管及び液
管を介して並列に接続し、前記四方弁の第１路は前記高
圧ガス管に、前記四方弁の第２路は前記低圧ガス管に連
通し、前記第１の室外側熱交換器の一方は、前記第２の
室外側二方弁を介し前記四方弁の第３路に連通すると共
に、前記第１の室外側熱交換器と前記第２の室外側二方
弁の間の配管を前記第１の室外側二方弁を介して前記四
方弁の第４路と接続し、前記第２の室外側熱交換器の一
方は、前記四方弁の第３路に連通し、前記第１、第２の
室外側熱交換器の他の一方は、前記第１、第２の室外側
膨張弁を介し、前記液管に合流接続した構成とするもの
である。In order to solve the above problems, the present invention provides a compressor, a four-way valve, a first outdoor heat exchanger,
An outdoor unit including a second outdoor heat exchanger, a first outdoor expansion valve, a second outdoor expansion valve, a first outdoor two-way valve, and a second outdoor two-way valve, and an outdoor unit A plurality of indoor units consisting of an inner expansion valve and an indoor heat exchanger are connected in parallel via a high pressure gas pipe, a low pressure gas pipe and a liquid pipe, and the first path of the four-way valve is connected to the high pressure gas pipe, The second passage of the four-way valve communicates with the low pressure gas pipe, and one of the first outdoor heat exchangers communicates with the third passage of the four-way valve via the second outdoor two-way valve and Connecting the pipe between the first outdoor heat exchanger and the second outdoor two-way valve to the fourth passage of the four-way valve via the first outdoor two-way valve, One of the outdoor heat exchangers No. 2 and No. 2 communicates with the third passage of the four-way valve, and the other one of the first and second outdoor heat exchangers has the first and second outdoor expansions. Through the valve, in front In which a structure in which joined connected to the liquid pipe.
【００１９】また、さらに、暖房、暖房主体運転時に前
記四方弁の第４路に連通している前記第１の室外側二方
弁を一定時間毎に開閉動作させる室外側二方弁制御手段
を備えた構成とするものである。Further, an outdoor two-way valve control means for opening and closing the first outdoor two-way valve, which communicates with the fourth passage of the four-way valve at the time of heating and heating main operation, is opened and closed at regular intervals. The configuration is provided.
【００２０】[0020]
【作用】本発明は上記した構成によって、冷房、暖房小
容量運転時に一方の室外側熱交換器を凝縮器、他の一方
の室外側熱交換器を蒸発器として動作させることによ
り、安定な圧力状態を保持でき、圧縮機の信頼性や安定
なシステムの運転状態を確保するというものである。According to the present invention, according to the above-described structure, when one of the outdoor heat exchangers is operated as a condenser and the other outdoor heat exchanger is operated as an evaporator during cooling and heating small capacity operation, a stable pressure is obtained. The state can be maintained, and the reliability of the compressor and the stable operating state of the system are ensured.
【００２１】また、さらに、暖房、暖房主体運転時に四
方弁の第４路へ液冷媒が溜まり込むことによる四方弁の
動作不良を防止し、常に安定なシステムの運転状態を確
保するというものである。Furthermore, it is intended to prevent malfunction of the four-way valve due to the liquid refrigerant accumulating in the fourth passage of the four-way valve during heating and heating-main operation, and to always ensure a stable operating state of the system. ..
【００２２】[0022]
【実施例】以下本発明の第１の実施例について図面を参
照しながら説明する。尚、従来と同一部分については同
一符号を付しその詳細な説明を省略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. Incidentally, the same parts as those of the conventional one are designated by the same reference numerals, and detailed description thereof will be omitted.
【００２３】図１において、１４は多室型空気調和機の
室外機であり、圧縮機１５、四方弁１６、第１の室外側
熱交換器１７、第２の室外側熱交換器１８、第１の室外
側膨張弁１９、第２の室外側膨張弁２０、第１の室外側
二方弁２１、第２の室外側二方弁２２とから成ってい
る。In FIG. 1, reference numeral 14 denotes an outdoor unit of a multi-room air conditioner, which includes a compressor 15, a four-way valve 16, a first outdoor heat exchanger 17, a second outdoor heat exchanger 18, and a second outdoor heat exchanger 18. The first outdoor side expansion valve 19, the second outdoor side expansion valve 20, the first outdoor side two-way valve 21, and the second outdoor side two-way valve 22.
【００２４】四方弁１６の第１路１６ａは高圧ガス管１
１に、四方弁１６の第２路１６ｂは低圧ガス管１２に連
通し、第１の室外側熱交換器１７の一方は、第２の室外
側二方弁２２を介し第２の室外側熱交換器１８の一方と
合流接続し、さらに四方弁１６の第３路１６ｃに連通す
ると共に、第１の室外側熱交換器１７と接続した第２の
室外側二方弁２２の間の配管を第１の室外側二方弁２１
を介して四方弁１６の第４路１６ｄと接続し、第１、第
２の室外側熱交換器１７，１８の他の一方は、第１、第
２の室外側膨張弁１９，２０を介し、液管１３に合流接
続している。The first passage 16a of the four-way valve 16 is the high pressure gas pipe 1
First, the second passage 16b of the four-way valve 16 communicates with the low pressure gas pipe 12, and one of the first outdoor heat exchangers 17 is connected to the second outdoor heat exchanger 22 via the second outdoor two-way valve 22. A pipe between the second outdoor two-way valve 22 connected to the first outdoor heat exchanger 17 while being connected to one side of the exchanger 18 and further connected to the third passage 16c of the four-way valve 16. First outdoor two-way valve 21
Is connected to the fourth passage 16d of the four-way valve 16 and the other one of the first and second outdoor heat exchangers 17 and 18 is connected via the first and second outdoor expansion valves 19 and 20. , Are connected to the liquid pipe 13 by merging.
【００２５】次に、このような構成においての動作につ
いて説明する。まず冷房運転のみの場合について説明す
る。この場合の冷媒の流れは実線矢印で表わし、各弁の
開閉状態は次の通りである。即ち、高圧側二方弁９は
閉、低圧側二方弁１０は開、第１の室外側二方弁２１は
閉、第２の室外側二方弁２２は開、各室内側膨張弁７は
各室内負荷に応じた開度である。Next, the operation in such a configuration will be described. First, the case of only the cooling operation will be described. The flow of the refrigerant in this case is represented by a solid arrow, and the open / closed state of each valve is as follows. That is, the high-pressure two-way valve 9 is closed, the low-pressure two-way valve 10 is open, the first outdoor two-way valve 21 is closed, the second outdoor two-way valve 22 is open, and each indoor expansion valve 7 is closed. Is an opening degree according to each indoor load.
【００２６】圧縮機１５より吐出された冷媒は、四方弁
１６を介し第１の室外側熱交換器１７，第２の室外側熱
交換器１８で凝縮液化され、第１の室外側膨張弁１９，
第２の室外側膨張弁２０を通って液管１３に導かれる。
そして室内側膨張弁７を通って各室内側熱交換器８に流
入し、それぞれ蒸発気化したあと、低圧側二方弁１０を
介し低圧ガス管１２を通って圧縮機１５に戻り、冷房運
転を行なう。The refrigerant discharged from the compressor 15 is condensed and liquefied by the first outdoor heat exchanger 17 and the second outdoor heat exchanger 18 via the four-way valve 16, and the first outdoor expansion valve 19 ，
It is guided to the liquid pipe 13 through the second outdoor expansion valve 20.
Then, after passing through the indoor expansion valve 7 and flowing into each indoor heat exchanger 8 and evaporating and vaporizing, respectively, it returns to the compressor 15 through the low pressure side two-way valve 10 and the low pressure gas pipe 12, and the cooling operation is performed. To do.
【００２７】また、冷房小容量運転のみの場合について
説明する。ここで各室内機６の運転状態は、室内機６ａ
…冷房、室内機６ｂ，６ｃ…停止とし、この場合の冷媒
の流れは破線矢印で表わし、各弁の開閉状態は次の通り
である。即ち、高圧側二方弁９は閉、低圧側二方弁１０
は開、第１の室外側二方弁２１は開、第２の室外側二方
弁２２は閉、室内側膨張弁７ａは室内負荷に応じた開
度、室内側膨張弁７ｂ，７ｃは全閉である。The case of only the cooling small capacity operation will be described. Here, the operating state of each indoor unit 6 is the indoor unit 6a.
... Cooling, indoor units 6b, 6c ... are stopped, and the flow of the refrigerant in this case is represented by broken line arrows, and the open / closed state of each valve is as follows. That is, the high-pressure side two-way valve 9 is closed, and the low-pressure side two-way valve 10
Is open, the first outdoor two-way valve 21 is open, the second outdoor two-way valve 22 is closed, the indoor expansion valve 7a is opened according to the indoor load, and the indoor expansion valves 7b and 7c are all open. It is closed.
【００２８】圧縮機１５より吐出された冷媒は、四方弁
１６を介し第２の室外側熱交換器１８で凝縮液化され、
第２の室外側膨張弁２０を通った冷媒の一部は液管１３
に導かれる。そして室内側膨張弁７ａを通って室内側熱
交換器８ａに流入し、蒸発気化したあと、低圧側二方弁
１０ａを介し低圧ガス管１２に流入する。また、第２の
室外側膨張弁２０を通った残りの冷媒は第１の室外側膨
張弁１９を通って第１の室外側熱交換器１７に流入し、
蒸発気化したあと、第１の室外側二方弁２１を介し低圧
ガス管１２に流入し、室内機を流れた冷媒と合流し、圧
縮機１５に戻り、冷房小容量運転を行なう。The refrigerant discharged from the compressor 15 is condensed and liquefied by the second outdoor heat exchanger 18 via the four-way valve 16.
Part of the refrigerant that has passed through the second outdoor expansion valve 20 is part of the liquid pipe 13
Be led to. Then, it flows through the indoor expansion valve 7a into the indoor heat exchanger 8a, evaporates and vaporizes, and then flows into the low pressure gas pipe 12 through the low pressure two-way valve 10a. Further, the remaining refrigerant that has passed through the second outdoor expansion valve 20 flows into the first outdoor heat exchanger 17 through the first outdoor expansion valve 19,
After evaporating and evaporating, it flows into the low-pressure gas pipe 12 through the first outdoor two-way valve 21, merges with the refrigerant flowing through the indoor unit, returns to the compressor 15, and performs a small cooling capacity operation.
【００２９】従って、冷房小容量運転（例えば室外機２
９．１ｋＷに対し室内機２９．１ｋＷの運転で圧縮機の
最小能力が５．８ｋＷ）時、第２の室外側熱交換器１８
の能力を５．８ｋＷに第１の室外側熱交換器１７の能力
を３．５ｋＷに制御することにより、圧縮機能力，蒸発
器能力，凝縮器能力をバランスさせることができ、サイ
クル的に安定な状態を確保できる。Therefore, the cooling small capacity operation (for example, the outdoor unit 2
The second outdoor heat exchanger 18 when the minimum capacity of the compressor is 5.8 kW with the operation of the indoor unit of 29.1 kW compared to 9.1 kW.
By controlling the capacity of the first outdoor heat exchanger 17 to 3.5 kW and controlling the capacity of the first outdoor heat exchanger 17 to 3.5 kW, it is possible to balance the compression function power, the evaporator capacity, and the condenser capacity, and to stabilize the cycle. It is possible to secure a good condition.
【００３０】次に暖房運転のみの場合について図２を用
いて説明する。この場合の冷媒の流れは実線矢印で表わ
し、各弁の開閉状態は次の通りである。即ち、高圧側二
方弁９は開、低圧側二方弁１０は閉、第１の室外側二方
弁２１は閉、第２の室外側二方弁２２は開、各室内側膨
張弁７は各室内負荷に応じた開度である。Next, only the heating operation will be described with reference to FIG. The flow of the refrigerant in this case is represented by a solid arrow, and the open / closed state of each valve is as follows. That is, the high-pressure two-way valve 9 is open, the low-pressure two-way valve 10 is closed, the first outdoor two-way valve 21 is closed, the second outdoor two-way valve 22 is open, and each indoor expansion valve 7 Is an opening degree according to each indoor load.
【００３１】圧縮機１５より吐出された冷媒は、高圧ガ
ス管１１、高圧側二方弁９を介して各室内側熱交換器８
に導かれ、ここで凝縮液化して室内側膨張弁７を介して
液管１３に流入し、第１の室外側膨張弁１９，第２の室
外側膨張弁２０で低圧二相状態まで減圧され、第１の室
外側熱交換器１７，第２の室外側熱交換器１８に入り蒸
発気化する。その後四方弁１６を介し圧縮機１５に戻
り、暖房運転を行なう。The refrigerant discharged from the compressor 15 is passed through the high-pressure gas pipe 11 and the high-pressure two-way valve 9 to each indoor heat exchanger 8
Is introduced into the liquid pipe 13 through the indoor expansion valve 7 and is decompressed to a low pressure two-phase state by the first outdoor expansion valve 19 and the second outdoor expansion valve 20. , The first outdoor heat exchanger 17 and the second outdoor heat exchanger 18 to be evaporated and vaporized. After that, it returns to the compressor 15 via the four-way valve 16 to perform the heating operation.
【００３２】また、暖房小容量運転のみの場合について
説明する。ここで各室内機６の運転状態は、室内機６ａ
…暖房、室内機６ｂ，６ｃ…停止とし、この場合の冷媒
の流れは破線矢印で表わし、各弁の開閉状態は次の通り
である。即ち、高圧側二方弁９ａは開、高圧側二方弁９
ｂ，９ｃは閉、低圧側二方弁１０ａは閉、低圧側二方弁
１０ｂ，１０ｃは開、第１の室外側二方弁２１は開、第
２の室外側二方弁２２は閉、室内側膨張弁７ａは室内負
荷に応じた開度、室内側膨張弁７ｂ，７ｃは全閉であ
る。The case of only the heating small capacity operation will be described. Here, the operating state of each indoor unit 6 is the indoor unit 6a.
... Heating, the indoor units 6b, 6c ... are stopped, and the flow of the refrigerant in this case is represented by broken line arrows, and the open / closed state of each valve is as follows. That is, the high-pressure side two-way valve 9a is open and the high-pressure side two-way valve 9 is
b and 9c are closed, the low pressure side two-way valve 10a is closed, the low pressure side two-way valves 10b and 10c are open, the first outdoor side two-way valve 21 is open, the second outdoor side two-way valve 22 is closed, The indoor expansion valve 7a is opened according to the indoor load, and the indoor expansion valves 7b and 7c are fully closed.
【００３３】圧縮機１５より吐出された冷媒の一部は、
高圧ガス管１１、高圧側二方弁９ａを介して室内側熱交
換器８ａに導かれ、ここで凝縮液化して室内側膨張弁７
ａを介して液管１３に流入する。また、圧縮機１５より
吐出された残りの冷媒は、四方弁１６、第１の室外側二
方弁２１を介して第１の室外側熱交換器１７に導かれ、
ここで凝縮液化して第１の室外側膨張弁１９を介して液
管１３に流入し、室内機を流れた冷媒と合流し、第２の
室外側膨張弁２０で低圧二相状態まで減圧され、第２の
室外側熱交換器１８に入り蒸発気化する。その後四方弁
１６を介し圧縮機１５に戻り、暖房運転小容量運転を行
なう。A part of the refrigerant discharged from the compressor 15 is
It is guided to the indoor heat exchanger 8a via the high pressure gas pipe 11 and the high pressure two-way valve 9a, where it is condensed and liquefied to the indoor expansion valve 7
It flows into the liquid pipe 13 via a. Further, the remaining refrigerant discharged from the compressor 15 is guided to the first outdoor heat exchanger 17 via the four-way valve 16 and the first outdoor two-way valve 21,
Here, it is condensed and liquefied, flows into the liquid pipe 13 through the first outdoor expansion valve 19, merges with the refrigerant flowing through the indoor unit, and is decompressed by the second outdoor expansion valve 20 to a low-pressure two-phase state. , Enters the second outdoor heat exchanger 18 and evaporates and vaporizes. After that, it returns to the compressor 15 via the four-way valve 16 to perform the heating operation small capacity operation.
【００３４】従って、暖房小容量運転（例えば室外機２
９．１ｋＷに対し室内機２．３ｋＷの運転で圧縮機の最
小能力が５．８ｋＷ）時、第２の室外側熱交換器１８の
能力を５．８ｋＷに第１の室外側熱交換器１７の能力を
３．５ｋＷに制御することにより、圧縮機能力，蒸発器
能力，凝縮器能力をバランスさせることができ、サイク
ル的に安定な状態を確保できる。Therefore, the heating small capacity operation (for example, the outdoor unit 2
When the minimum capacity of the compressor is 5.8 kW when the indoor unit is operated at 2.3 kW with respect to 9.1 kW, the capacity of the second outdoor heat exchanger 18 is increased to 5.8 kW and the first outdoor heat exchanger 17 is operated. By controlling the capacity of the battery to 3.5 kW, it is possible to balance the compression function power, the evaporator capacity, and the condenser capacity, and it is possible to secure a stable state in a cycle.
【００３５】次に冷房主体運転の場合について図３を用
いて説明する。ここで各室内機６の運転状態は、室内機
６ａ，６ｂ…冷房、室内機６ｃ…暖房とし、各弁の開閉
状態は次の通りである。即ち、高圧側二方弁９ａ，９ｂ
は閉、高圧側二方弁９ｃは開、低圧側二方弁１０ａ，１
０ｂは開、低圧側二方弁１０ｃは閉、第１の室外側二方
弁２１は閉、第２の室外側二方弁２２は開、各室内側膨
張弁７は各室内負荷に応じた開度である。Next, the case of cooling-main operation will be described with reference to FIG. Here, the operating state of each indoor unit 6 is indoor unit 6a, 6b ... Cooling, indoor unit 6c ... Heating, and the open / closed state of each valve is as follows. That is, the high pressure side two-way valves 9a, 9b
Is closed, the high pressure side two-way valve 9c is open, the low pressure side two-way valve 10a, 1
0b is open, the low pressure side two-way valve 10c is closed, the first outdoor side two-way valve 21 is closed, the second outdoor side two-way valve 22 is open, and each indoor expansion valve 7 responds to each indoor load. It is the opening degree.
【００３６】圧縮機１５より吐出された一部の冷媒は、
四方弁１６を介し第１の室外側熱交換器１７，第２の室
外側熱交換器１８で凝縮液化され、第１の室外側膨張弁
１９，第２の室外側膨張弁２０を通って液管１３に導か
れる。また残りの冷媒は、高圧ガス管１１に流入し、高
圧側二方弁９ｃを介して室内側熱交換器６ｃに導かれ、
ここで凝縮液化して室内側膨張弁７ｃを介して液管１３
に流入し、第１の室外側熱交換器１７，第２の室外側熱
交換器１８を通ってきた冷媒と合流する。A part of the refrigerant discharged from the compressor 15 is
It is condensed and liquefied by the first outdoor heat exchanger 17 and the second outdoor heat exchanger 18 via the four-way valve 16, and passes through the first outdoor expansion valve 19 and the second outdoor expansion valve 20 to produce liquid. It is guided to the pipe 13. The remaining refrigerant flows into the high-pressure gas pipe 11 and is guided to the indoor heat exchanger 6c via the high-pressure two-way valve 9c,
Here, it is condensed and liquefied, and the liquid pipe 13 is passed through the indoor expansion valve 7c.
And joins the refrigerant flowing through the first outdoor heat exchanger 17 and the second outdoor heat exchanger 18.
【００３７】そして室内側膨張弁７ａ，７ｂを通って室
内側熱交換器８ａ，８ｂに流入し、それぞれ蒸発気化し
たあと、低圧側二方弁１０ａ，１０ｂを経て低圧ガス管
１２に導かれ、圧縮機１５に戻る。Then, after passing through the indoor expansion valves 7a, 7b and flowing into the indoor heat exchangers 8a, 8b, vaporized and vaporized respectively, they are guided to the low pressure gas pipe 12 through the low pressure two-way valves 10a, 10b. Return to the compressor 15.
【００３８】次に暖房主体運転の場合について図４を用
いて説明する。ここで各室内機６の運転状態は、室内機
６ａ，６ｂ…暖房、室内機６ｃ…冷房とし、各弁の開閉
状態は次の通りである。即ち、高圧側二方弁９ａ，９ｂ
は開、高圧側二方弁９ｃは閉、低圧側二方弁１０ａ，１
０ｂは閉、低圧側二方弁１０ｃは開、第１の室外側二方
弁２１は閉、第２の室外側二方弁２２は開、各室内側膨
張弁７は各室内負荷に応じた開度である。Next, the case of heating-main operation will be described with reference to FIG. Here, the operating state of each indoor unit 6 is indoor unit 6a, 6b ... Heating, indoor unit 6c ... Cooling, and the opening / closing state of each valve is as follows. That is, the high pressure side two-way valves 9a, 9b
Is open, the high pressure side two-way valve 9c is closed, the low pressure side two-way valve 10a, 1
0b is closed, the low pressure side two-way valve 10c is open, the first outdoor side two-way valve 21 is closed, the second outdoor side two-way valve 22 is open, and each indoor expansion valve 7 corresponds to each indoor load. It is the opening degree.
【００３９】圧縮機１５より吐出された冷媒は、高圧ガ
ス管１１に流入し、高圧側二方弁９ａ，９ｂを介して室
内側熱交換器８ａ，８ｂに導かれ、ここで凝縮液化して
室内側膨張弁７ａ，７ｂを介して液管１３に流入する。The refrigerant discharged from the compressor 15 flows into the high pressure gas pipe 11 and is guided to the indoor heat exchangers 8a and 8b through the high pressure two-way valves 9a and 9b, where it is condensed and liquefied. It flows into the liquid pipe 13 via the indoor expansion valves 7a and 7b.
【００４０】液管１３の一部の冷媒は、室内側膨張弁７
ｃを通って室内側熱交換器８ｃに流入し、蒸発気化した
あと、低圧側二方弁１０ｃを経て低圧ガス管１２に流入
する。また残りの冷媒は、第１の室外側膨張弁１９，第
２の室外側膨張弁２０で低圧二相状態まで減圧され、第
１の室外側熱交換器１７，第２の室外側熱交換器１８に
入り蒸発気化する。その後四方弁１６を介し低圧ガス管
１２に流入し、低圧側二方弁１０ｃを通った冷媒と合流
した後圧縮機１５に戻る。A part of the refrigerant in the liquid pipe 13 is used as the indoor expansion valve 7
After passing through c, it flows into the indoor heat exchanger 8c, evaporates and vaporizes, and then flows into the low-pressure gas pipe 12 through the low-pressure two-way valve 10c. The remaining refrigerant is decompressed to a low-pressure two-phase state by the first outdoor expansion valve 19 and the second outdoor expansion valve 20, and the first outdoor heat exchanger 17 and the second outdoor heat exchanger are 18 is entered and vaporized. After that, it flows into the low-pressure gas pipe 12 through the four-way valve 16, merges with the refrigerant that has passed through the low-pressure two-way valve 10c, and then returns to the compressor 15.
【００４１】以上のように、冷房小容量運転、暖房小容
量運転時に、室外熱交換器の一方を凝縮器、他方を蒸発
器として動作させ、従来生じていた圧縮機能力，凝縮器
能力，蒸発器能力のアンバランスを適正化でき、サイク
ル的に安定な状態を確保できる。As described above, during the cooling small capacity operation and the heating small capacity operation, one of the outdoor heat exchangers is operated as the condenser and the other is operated as the evaporator, so that the compression function power, the condenser capacity, and the evaporation which have been conventionally generated. It is possible to optimize the imbalance of vessel capacity and ensure a stable cycle.
【００４２】次に、本発明の第２の実施例について図面
を参照しながら説明する。尚、第１の実施例と同一部分
については同一符号を付しその詳細な説明を省略する。Next, a second embodiment of the present invention will be described with reference to the drawings. The same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
【００４３】図５において、２３はリモコン、２４は室
内コントローラである。２５は室外コントローラであ
り、室内機運転状態検知器２６、第１の室外側二方弁制
御手段２７とから成っている。In FIG. 5, 23 is a remote controller and 24 is an indoor controller. An outdoor controller 25 includes an indoor unit operating state detector 26 and a first outdoor two-way valve control means 27.
【００４４】図８は、本発明の多室型空気調和機のブロ
ック図、図９は、第１の室外側二方弁２１の制御フロー
チャートである。FIG. 8 is a block diagram of the multi-room air conditioner of the present invention, and FIG. 9 is a control flowchart of the first outdoor two-way valve 21.
【００４５】次に、第１の室外側二方弁２１の制御につ
いて図８、図９を用いて説明する。まずリモコン２３が
ＯＮとなり、圧縮機１５がスタートする（ステップ
１）。次に、室内機運転状態検知器２６により、暖房も
しくは暖房主体運転かどうかが判断され（ステップ
２）、暖房もしくは暖房主体運転の場合まず第１の室外
側二方弁制御手段２７により、第１の室外側二方弁２１
は閉状態となる（ステップ３）。Next, the control of the first outdoor two-way valve 21 will be described with reference to FIGS. 8 and 9. First, the remote controller 23 is turned on and the compressor 15 is started (step 1). Next, the indoor unit operating state detector 26 determines whether or not heating or heating-based operation is performed (step 2). In the case of heating or heating-based operation, the first outdoor two-way valve control means 27 first Outdoor two-way valve 21
Is closed (step 3).
【００４６】次に、タイマー等により一定時間（例えば
９分間）第１の室外側二方弁２１は閉状態を保つ（ステ
ップ４）。その後第１の室外側二方弁制御手段２７によ
り、第１の室外側二方弁２１は開状態となり（ステップ
５）、タイマー等により一定時間（例えば１分間）第１
の室外側二方弁２１は開状態を保つ（ステップ６）。Next, the first outdoor two-way valve 21 is kept closed for a certain time (for example, 9 minutes) by a timer or the like (step 4). After that, the first outdoor two-way valve control means 27 opens the first outdoor two-way valve 21 (step 5), and the first outdoor side two-way valve 21 is opened for a predetermined time (for example, 1 minute) by a timer or the like.
The outdoor two-way valve 21 is kept open (step 6).
【００４７】このように第１の室外側二方弁２１は一定
時間毎に開閉動作を行う。また、ステップ２で冷房もし
くは冷房主体運転と判断された場合、第１の室外側二方
弁制御手段２７により、第１の室外側二方弁２１は閉状
態となる（ステップ７）。In this way, the first outdoor two-way valve 21 opens and closes at regular intervals. When it is determined in step 2 that cooling or cooling-main operation is performed, the first outdoor two-way valve control unit 27 closes the first outdoor two-way valve 21 (step 7).
【００４８】次に、このような構成においての動作につ
いて説明する。まず冷房運転のみの場合について説明す
る。この場合の冷媒の流れは実線矢印で表わし、各弁の
開閉状態は次の通りである。即ち、高圧側二方弁９は
閉、低圧側二方弁１０は開、第１の室外側二方弁２１は
第１の室外側二方弁制御手段２７により常に閉、第２の
室外側二方弁２２は開、各室内側膨張弁７は各室内負荷
に応じた開度である。Next, the operation in such a configuration will be described. First, the case of only the cooling operation will be described. The flow of the refrigerant in this case is represented by a solid arrow, and the open / closed state of each valve is as follows. That is, the high-pressure side two-way valve 9 is closed, the low-pressure side two-way valve 10 is open, the first outdoor two-way valve 21 is always closed by the first outdoor two-way valve control means 27, and the second outdoor side. The two-way valve 22 is open, and each indoor expansion valve 7 has an opening degree corresponding to each indoor load.
【００４９】圧縮機１５より吐出された冷媒は、四方弁
１６を介し第１の室外側熱交換器１７，第２の室外側熱
交換器１８で凝縮液化され、第１の室外側膨張弁１９，
第２の室外側膨張弁２０を通って液管１３に導かれる。
そして室内側膨張弁７を通って各室内側熱交換器８に流
入し、それぞれ蒸発気化したあと、低圧側二方弁１０を
介し低圧ガス管１２を通って圧縮機２に戻り、冷房運転
を行なう。The refrigerant discharged from the compressor 15 is condensed and liquefied in the first outdoor heat exchanger 17 and the second outdoor heat exchanger 18 through the four-way valve 16, and the first outdoor expansion valve 19 ，
It is guided to the liquid pipe 13 through the second outdoor expansion valve 20.
Then, after passing through the indoor expansion valve 7 and flowing into each indoor heat exchanger 8 and evaporating and vaporizing, respectively, it returns to the compressor 2 through the low pressure two-way valve 10 and the low pressure gas pipe 12, and the cooling operation is performed. To do.
【００５０】この時、四方弁１６の第４路１６ｄと第１
の室外側二方弁２１の間の配管は、低圧ガス管１２と連
通している為、液冷媒は溜まり込まない。At this time, the fourth passage 16d of the four-way valve 16 and the first passage 16d
Since the pipe between the outdoor two-way valve 21 is communicated with the low pressure gas pipe 12, the liquid refrigerant does not accumulate.
【００５１】次に暖房運転のみの場合について説明す
る。この場合の冷媒の流れは実線矢印で表わし、各弁の
開閉状態は次の通りである。即ち、高圧側二方弁９は
開、低圧側二方弁１０は閉、第１の室外側二方弁２１は
第１の室外側二方弁制御手段２７により閉、第２の室外
側二方弁２２は開、各室内側膨張弁７は各室内負荷に応
じた開度である。Next, the case of only the heating operation will be described. The flow of the refrigerant in this case is represented by a solid arrow, and the open / closed state of each valve is as follows. That is, the high-pressure two-way valve 9 is open, the low-pressure two-way valve 10 is closed, the first outdoor two-way valve 21 is closed by the first outdoor two-way valve control means 27, and the second outdoor two-way valve is closed. The one-way valve 22 is open, and each indoor expansion valve 7 has an opening degree corresponding to each indoor load.
【００５２】圧縮機１５より吐出された一部の冷媒は、
高圧ガス管１１、高圧側二方弁９を介して各室内側熱交
換器８に導かれ、ここで凝縮液化して室内側膨張弁７を
介して液管１３に流入し、第１の室外側膨張弁１９，第
２の室外側膨張弁２０で低圧二相状態まで減圧され、第
１の室外側熱交換器１７，第２の室外側熱交換器１８に
入り蒸発気化する。その後四方弁１６を介し圧縮機１５
に戻り、暖房運転を行なう。A part of the refrigerant discharged from the compressor 15 is
It is guided to each indoor heat exchanger 8 via the high pressure gas pipe 11 and the high pressure side two-way valve 9, where it is condensed and liquefied and flows into the liquid pipe 13 via the indoor expansion valve 7, and the first chamber The pressure is reduced to a low-pressure two-phase state by the outer expansion valve 19 and the second outdoor expansion valve 20, enters the first outdoor heat exchanger 17 and the second outdoor heat exchanger 18, and evaporates and vaporizes. Then, through the four-way valve 16, the compressor 15
Return to and perform heating operation.
【００５３】圧縮機１５より吐出された残りの冷媒は、
四方弁１６を介し四方弁１６の第４路１６ｄと第１の室
外側二方弁２１の間の配管内で凝縮する。この時、第１
の室外側二方弁制御手段２７により、一定時間毎に第１
の室外側二方弁２１は開状態となり、四方弁１６の第４
路１６ｄと第１の室外側二方弁２１の間の配管内の冷媒
が、低圧ガス管１２にバイパスされ、四方弁１６の第４
路１６ｄと第１の室外側二方弁２１の間の配管に冷媒が
溜まり込むことはない。The remaining refrigerant discharged from the compressor 15 is
Condensation occurs in the pipe between the fourth passage 16d of the four-way valve 16 and the first outdoor two-way valve 21 via the four-way valve 16. At this time, the first
By the outdoor two-way valve control means 27 of the
The outdoor two-way valve 21 is opened and the four-way valve 16
The refrigerant in the pipe between the passage 16d and the first outdoor-side two-way valve 21 is bypassed to the low-pressure gas pipe 12, and the four-way valve 16
The refrigerant does not collect in the pipe between the passage 16d and the first outdoor two-way valve 21.
【００５４】次に冷房主体運転の場合について図６を用
いて説明する。ここで各室内機６の運転状態は、室内機
６ａ，６ｂ…冷房、室内機６ｃ…暖房とし、各弁の開閉
状態は次の通りである。即ち、高圧側二方弁９ａ，９ｂ
は閉、高圧側二方弁９ｃは開、低圧側二方弁１０ａ，１
０ｂは開、低圧側二方弁１０ｃは閉、第１の室外側二方
弁２１は第１の室外側二方弁制御手段２７により常に
閉、第２の室外側二方弁２２は開、各室内側膨張弁７は
各室内負荷に応じた開度である。Next, the case of the cooling main operation will be described with reference to FIG. Here, the operating state of each indoor unit 6 is indoor unit 6a, 6b ... Cooling, indoor unit 6c ... Heating, and the open / closed state of each valve is as follows. That is, the high pressure side two-way valves 9a, 9b
Is closed, the high pressure side two-way valve 9c is open, the low pressure side two-way valve 10a, 1
0b is open, the low pressure side two-way valve 10c is closed, the first outdoor two-way valve 21 is always closed by the first outdoor two-way valve control means 27, the second outdoor two-way valve 22 is open, Each indoor expansion valve 7 has an opening degree corresponding to each indoor load.
【００５５】圧縮機１５より吐出された一部の冷媒は、
四方弁１６を介し第１の室外側熱交換器１７，第２の室
外側熱交換器１８で凝縮液化され、第１の室外側膨張弁
１９，第２の室外側膨張弁２０を通って液管１３に導か
れる。また残りの冷媒は、高圧ガス管１１に流入し、高
圧側二方弁９ｃを介して室内側熱交換器６ｃに導かれ、
ここで凝縮液化して室内側膨張弁７ｃを介して液管１３
に流入し、第１の室外側熱交換器１７，第２の室外側熱
交換器１８を通ってきた冷媒と合流する。A part of the refrigerant discharged from the compressor 15 is
It is condensed and liquefied by the first outdoor heat exchanger 17 and the second outdoor heat exchanger 18 via the four-way valve 16, and passes through the first outdoor expansion valve 19 and the second outdoor expansion valve 20 to produce liquid. It is guided to the pipe 13. The remaining refrigerant flows into the high-pressure gas pipe 11 and is guided to the indoor heat exchanger 6c via the high-pressure two-way valve 9c,
Here, it is condensed and liquefied, and the liquid pipe 13 is passed through the indoor expansion valve 7c.
And joins the refrigerant flowing through the first outdoor heat exchanger 17 and the second outdoor heat exchanger 18.
【００５６】そして室内側膨張弁７ａ，７ｂを通って室
内側熱交換器８ａ，８ｂに流入し、それぞれ蒸発気化し
たあと、低圧側二方弁１０ａ，１０ｂを経て低圧ガス管
１２に導かれ、圧縮機１５に戻る。Then, after passing through the indoor expansion valves 7a, 7b and flowing into the indoor heat exchangers 8a, 8b, vaporized and vaporized respectively, they are guided to the low-pressure gas pipe 12 through the low-pressure two-way valves 10a, 10b, Return to the compressor 15.
【００５７】この時、四方弁１６の第４路１６ｄと第１
の室外側二方弁２１の間の配管は、低圧ガス管１２と連
通している為、液冷媒は溜まり込まない。At this time, the fourth passage 16d of the four-way valve 16 and the first passage 16d
Since the pipe between the outdoor two-way valve 21 is communicated with the low pressure gas pipe 12, the liquid refrigerant does not accumulate.
【００５８】次に暖房主体運転の場合について図７を用
いて説明する。ここで各室内機６の運転状態は、室内機
６ａ，６ｂ…暖房、室内機６ｃ…冷房とし、各弁の開閉
状態は次の通りである。即ち、高圧側二方弁９ａ，９ｂ
は開、高圧側二方弁９ｃは閉、低圧側二方弁１０ａ，１
０ｂは閉、低圧側二方弁１０ｃは開、第１の室外側二方
弁２１は第１の室外側二方弁制御手段２７により閉、第
２の室外側二方弁２２は開、各室内側膨張弁７は各室内
負荷に応じた開度である。Next, the case of heating-main operation will be described with reference to FIG. Here, the operating state of each indoor unit 6 is indoor unit 6a, 6b ... Heating, indoor unit 6c ... Cooling, and the opening / closing state of each valve is as follows. That is, the high pressure side two-way valves 9a, 9b
Is open, the high pressure side two-way valve 9c is closed, the low pressure side two-way valve 10a, 1
0b is closed, the low pressure side two-way valve 10c is opened, the first outdoor side two-way valve 21 is closed by the first outdoor side two-way valve control means 27, and the second outdoor side two-way valve 22 is opened. The indoor expansion valve 7 has an opening degree corresponding to each indoor load.
【００５９】圧縮機１５より吐出された一部の冷媒は、
高圧ガス管１１に流入し、高圧側二方弁９ａ，９ｂを介
して室内側熱交換器８ａ，８ｂに導かれ、ここで凝縮液
化して室内側膨張弁７ａ，７ｂを介して液管１３に流入
する。A part of the refrigerant discharged from the compressor 15 is
It flows into the high-pressure gas pipe 11 and is guided to the indoor heat exchangers 8a and 8b through the high-pressure two-way valves 9a and 9b, where it is condensed and liquefied and the liquid pipe 13 through the indoor expansion valves 7a and 7b. Flow into.
【００６０】液管１３の一部の冷媒は、室内側膨張弁７
ｃを通って室内側熱交換器８ｃに流入し、蒸発気化した
あと、低圧側二方弁１０ｃを経て低圧ガス管１２に流入
する。また残りの冷媒は、第１の室外側膨張弁１９，第
２の室外側膨張弁２０で低圧二相状態まで減圧され、第
１の室外側熱交換器１７，第２の室外側熱交換器１８に
入り蒸発気化する。その後四方弁１６を介し低圧ガス管
１２に流入し、低圧側二方弁１０ｃを通った冷媒と合流
した後圧縮機１５に戻る。A part of the refrigerant in the liquid pipe 13 is used as the indoor expansion valve 7
After passing through c, it flows into the indoor heat exchanger 8c, evaporates and vaporizes, and then flows into the low-pressure gas pipe 12 through the low-pressure two-way valve 10c. The remaining refrigerant is decompressed to a low-pressure two-phase state by the first outdoor expansion valve 19 and the second outdoor expansion valve 20, and the first outdoor heat exchanger 17 and the second outdoor heat exchanger are 18 is entered and vaporized. After that, it flows into the low-pressure gas pipe 12 through the four-way valve 16, merges with the refrigerant that has passed through the low-pressure two-way valve 10c, and then returns to the compressor 15.
【００６１】圧縮機１５より吐出された残りの冷媒は、
四方弁１６を介し四方弁１６の第４路１６ｄと第１の室
外側二方弁２１の間の配管内で凝縮する。この時、第１
の室外側二方弁制御手段２７により、一定時間毎に第１
の室外側二方弁２１は開状態となり、四方弁１６の第４
路１６ｄと第１の室外側二方弁２１の間の配管内の冷媒
が、低圧ガス管１２にバイパスされ、四方弁１６の第４
路１６ｄと第１の室外側二方弁２１の間の配管に冷媒が
溜まり込むことはない。The remaining refrigerant discharged from the compressor 15 is
Condensation occurs in the pipe between the fourth passage 16d of the four-way valve 16 and the first outdoor two-way valve 21 via the four-way valve 16. At this time, the first
By the outdoor two-way valve control means 27 of the
The outdoor two-way valve 21 is opened and the four-way valve 16
The refrigerant in the pipe between the passage 16d and the first outdoor-side two-way valve 21 is bypassed to the low-pressure gas pipe 12, and the four-way valve 16
The refrigerant does not collect in the pipe between the passage 16d and the first outdoor two-way valve 21.
【００６２】以上のように、暖房運転、暖房主体運転時
に、四方弁１６の第４路１６ｄと第１の室外側二方弁２
１の間の配管内の冷媒を第１の室外側二方弁制御手段２
７により、一定時間毎に第１の室外側二方弁２１は開状
態とすることにより、低圧ガス管１２にバイパスするの
で、四方弁１６の第４路１６ｄと第１の室外側二方弁２
１の間の配管内へ液冷媒が溜まり込むことがなくなり、
従来生じていた四方弁の動作不良を防止し、常に安定な
システムの運転状態を確保することができる。As described above, during the heating operation and the heating main operation, the fourth passage 16d of the four-way valve 16 and the first outdoor two-way valve 2
The refrigerant in the pipe between the first and second outdoor two-way valve control means 2
7, the first outdoor two-way valve 21 is opened at regular intervals to bypass the low pressure gas pipe 12, so that the fourth passage 16d of the four-way valve 16 and the first outdoor two-way valve 16 are opened. Two
Liquid refrigerant will not accumulate in the pipe between 1
It is possible to prevent a malfunction of the four-way valve that has occurred in the past and always ensure a stable operating state of the system.
【００６３】[0063]
【発明の効果】以上の説明から明らかなように本発明
は、圧縮機、四方弁、第１の室外側熱交換器、第２の室
外側熱交換器、第１の室外側膨張弁、第２の室外側膨張
弁、第１の室外側二方弁、第２の室外側二方弁とから成
る室外機と、室内側膨張弁、室内側熱交換器とから成る
複数の室内機を高圧ガス管、低圧ガス管及び液管を介し
て並列に接続し、前記四方弁の第１路は前記高圧ガス管
に、前記四方弁の第２路は前記低圧ガス管に連通し、前
記第１の室外側熱交換器の一方は、前記第２の室外側二
方弁を介し前記四方弁の第３路に連通すると共に、前記
第１の室外側熱交換器と前記第２の室外側二方弁の間の
配管を前記第１の室外側二方弁を介して前記四方弁の第
４路と接続し、前記第２の室外側熱交換器の一方は、前
記四方弁の第３路に連通し、前記第１、第２の室外側熱
交換器の他の一方は、前記第１、第２の室外側膨張弁を
介し、前記液管に合流接続した構成とするものである。As is apparent from the above description, the present invention provides a compressor, a four-way valve, a first outdoor heat exchanger, a second outdoor heat exchanger, a first outdoor expansion valve, and a first outdoor expansion valve. The outdoor unit including the outdoor expansion valve No. 2, the first outdoor two-way valve, and the second outdoor two-way valve, and the indoor units including the indoor expansion valve and the indoor heat exchanger have high pressures. The first passage of the four-way valve communicates with the high-pressure gas pipe, and the second passage of the four-way valve communicates with the low-pressure gas pipe through a gas pipe, a low-pressure gas pipe, and a liquid pipe. One of the outdoor heat exchangers of (1) and (2) communicates with the third passage of the four-way valve via the second outdoor two-way valve, and the first outdoor heat exchanger and the second outdoor two-way valve. The pipe between the one-way valves is connected to the fourth passage of the four-way valve via the first outdoor two-way valve, and one of the second outdoor heat exchangers is connected to the third passage of the four-way valve. To Through the first, the other one of the second outdoor heat exchanger, the first, via the second outdoor expansion valve, in which a structure in which joined connected to the liquid pipe.
【００６４】そのため本発明の多室型空気調和機は、冷
房小容量運転、暖房小容量運転時に、室外熱交換器の一
方を凝縮器、他方を蒸発器として動作させ、従来生じて
いた圧縮機能力，凝縮器能力，蒸発器能力のアンバラン
スを適正化でき、サイクル的に安定な状態を確保でき
る。Therefore, in the multi-room air conditioner of the present invention, one of the outdoor heat exchangers is operated as a condenser and the other is operated as an evaporator at the time of the cooling small capacity operation and the heating small capacity operation, and the compression function which has been conventionally produced. The imbalance of power, condenser capacity, and evaporator capacity can be optimized, and a stable state can be secured in a cycle.
【００６５】また、さらに、暖房、暖房主体運転時に前
記四方弁の第４路に連通している前記第１の室外側二方
弁を一定時間毎に開閉動作させる室外側二方弁制御手段
を備えた構成とするものである。Further, an outdoor two-way valve control means for opening and closing the first outdoor two-way valve, which communicates with the fourth passage of the four-way valve at the time of heating and heating main operation, is opened and closed at regular intervals. The configuration is provided.
【００６６】そのため本発明の多室型空気調和機は、暖
房運転、暖房主体運転時に、四方弁の第４路と第１の室
外側二方弁の間の配管へ液冷媒が溜まり込むことがなく
なり、従来生じていた四方弁の動作不良を防止し、常に
安定なシステムの運転状態を確保することができる。Therefore, in the multi-room air conditioner of the present invention, during the heating operation and the heating-main operation, the liquid refrigerant may collect in the pipe between the fourth path of the four-way valve and the first outdoor two-way valve. It is possible to prevent the malfunction of the four-way valve that has occurred in the past, and always secure a stable operating state of the system.
【図１】本発明の第１の実施例における多室型空気調和
機の冷房運転状態を示す冷凍サイクル図FIG. 1 is a refrigeration cycle diagram showing a cooling operation state of a multi-room air conditioner according to a first embodiment of the present invention.
【図２】同実施例の多室型空気調和機の暖房運転状態を
示す冷凍サイクル図FIG. 2 is a refrigeration cycle diagram showing a heating operation state of the multi-room air conditioner of the same embodiment.
【図３】同実施例の多室型空気調和機の冷房主体運転状
態を示す冷凍サイクル図FIG. 3 is a refrigeration cycle diagram showing a cooling-main operation state of the multi-room air conditioner of the embodiment.
【図４】同実施例の多室型空気調和機の暖房主体運転状
態を示す冷凍サイクル図FIG. 4 is a refrigeration cycle diagram showing a heating main operation state of the multi-room air conditioner of the same embodiment.
【図５】本発明の第２の実施例における多室型空気調和
機の冷凍サイクル図FIG. 5 is a refrigeration cycle diagram of a multi-room air conditioner according to a second embodiment of the present invention.
【図６】同実施例の多室型空気調和機の冷房主体運転状
態を示す冷凍サイクル図FIG. 6 is a refrigeration cycle diagram showing a cooling-main operation state of the multi-room air conditioner of the embodiment.
【図７】同実施例の多室型空気調和機の暖房主体運転状
態を示す冷凍サイクル図FIG. 7 is a refrigeration cycle diagram showing a heating-main operating state of the multi-room air conditioner of the same embodiment.
【図８】同実施例の多室型空気調和機のブロック図FIG. 8 is a block diagram of the multi-room air conditioner of the same embodiment.
【図９】同実施例の多室型空気調和機の第１の室外側二
方弁の制御フローチャートFIG. 9 is a control flowchart of a first outdoor two-way valve of the multi-room air conditioner of the same embodiment.
【図１０】従来の多室型空気調和機の冷凍サイクル図FIG. 10 is a refrigeration cycle diagram of a conventional multi-room air conditioner.
【図１１】従来の多室型空気調和機の冷房主体運転状態
を示す冷凍サイクル図FIG. 11 is a refrigeration cycle diagram showing a cooling main operation state of a conventional multi-room air conditioner.
【図１２】従来の多室型空気調和機の暖房主体運転状態
を示す冷凍サイクル図FIG. 12 is a refrigeration cycle diagram showing a heating-based operation state of a conventional multi-room air conditioner.
６ 室内機 ７ 室内側膨張弁 ８ 室内側熱交換器 ９ 高圧側二方弁 １０ 低圧側二方弁 １１ 高圧ガス管 １２ 低圧ガス管 １３ 液管 １４ 室外機 １５ 圧縮機 １６ 四方弁 １６ａ 四方弁の第１路 １６ｂ 四方弁の第２路 １６ｃ 四方弁の第３路 １６ｄ 四方弁の第４路 １７ 第１の室外側熱交換器 １８ 第２の室外側熱交換器 １９ 第１の室外側膨張弁 ２０ 第２の室外側膨張弁 ２１ 第１の室外側二方弁 ２２ 第２の室外側二方弁 ２７ 第１の室外側二方弁方弁制御手段 6 Indoor unit 7 Indoor expansion valve 8 Indoor heat exchanger 9 High-pressure two-way valve 10 Low-pressure two-way valve 11 High-pressure gas pipe 12 Low-pressure gas pipe 13 Liquid pipe 14 Outdoor unit 15 Compressor 16 Four-way valve 16a Four-way valve First passage 16b Second passage of four-way valve 16c Third passage of four-way valve 16d Fourth passage of four-way valve 17 First outdoor heat exchanger 18 Second outdoor heat exchanger 19 First outdoor expansion valve 20 2nd outdoor expansion valve 21 1st outdoor 2 way valve 22 2nd outdoor 2 way valve 27 1st outdoor 2 way valve control means
───────────────────────────────────────────────────── フロントページの続き (72)発明者 金子 孝 大阪府東大阪市高井田本通３丁目22番地 松下冷機株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Kaneko 3-22, Takaidahondori, Higashiosaka-shi, Osaka Prefecture Matsushita Refrigerating Machinery Co., Ltd.
Claims (2)
器、第２の室外側熱交換器、第１の室外側膨張弁、第２
の室外側膨張弁、第１の室外側二方弁、第２の室外側二
方弁とから成る室外機と、室内側膨張弁、室内側熱交換
器とから成る複数の室内機を高圧ガス管、低圧ガス管及
び液管を介して並列に接続し、前記四方弁の第１路は前
記高圧ガス管に、前記四方弁の第２路は前記低圧ガス管
に連通し、前記第１の室外側熱交換器の一方は、前記第
２の室外側二方弁を介し前記四方弁の第３路に連通する
と共に、前記第１の室外側熱交換器と前記第２の室外側
二方弁の間の配管を前記第１の室外側二方弁を介して前
記四方弁の第４路と接続し、前記第２の室外側熱交換器
の一方は、前記四方弁の第３路に連通し、前記第１、第
２の室外側熱交換器の他の一方は、前記第１、第２の室
外側膨張弁を介し、前記液管に合流接続し、前記室内側
熱交換器の一方は、前記高圧ガス管または前記低圧ガス
管と高圧側二方弁及び低圧側二方弁の開閉により切替可
能に接続し、前記室内側熱交換器の他の一方は、前記室
内側膨張弁を介し前記液管に接続した多室型空気調和
機。1. A compressor, a four-way valve, a first outdoor heat exchanger, a second outdoor heat exchanger, a first outdoor expansion valve, and a second.
Of the outdoor side expansion valve, the first outdoor side two-way valve, and the second outdoor side two-way valve, and a plurality of indoor units consisting of the indoor side expansion valve and the indoor side heat exchanger Connected in parallel via a pipe, a low-pressure gas pipe and a liquid pipe, the first passage of the four-way valve communicates with the high-pressure gas pipe, and the second passage of the four-way valve communicates with the low-pressure gas pipe. One of the outdoor heat exchangers communicates with the third passage of the four-way valve via the second outdoor two-way valve, and the first outdoor heat exchanger and the second outdoor two-way The pipe between the valves is connected to the fourth passage of the four-way valve via the first outdoor two-way valve, and one of the second outdoor heat exchangers is connected to the third passage of the four-way valve. In communication, the other one of the first and second outdoor heat exchangers is connected to the liquid pipe through the first and second outdoor expansion valves to join the indoor heat exchanger. One is The high-pressure gas pipe or the low-pressure gas pipe and the high-pressure side two-way valve and the low-pressure side two-way valve is connected to be switchable, and the other one of the indoor heat exchangers is connected via the indoor expansion valve A multi-room air conditioner connected to a liquid pipe.
４路に連通している前記第１の室外側二方弁を一定時間
毎に開閉動作させる室外側二方弁制御手段を備えた請求
項１記載の多室型空気調和機。2. An outdoor two-way valve control means for opening and closing the first outdoor two-way valve communicating with the fourth passage of the four-way valve during heating and heating main operation is provided. The multi-room air conditioner according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1865892A JPH05215428A (en) | 1992-02-04 | 1992-02-04 | Multi-room air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1865892A JPH05215428A (en) | 1992-02-04 | 1992-02-04 | Multi-room air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05215428A true JPH05215428A (en) | 1993-08-24 |
Family
ID=11977718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1865892A Pending JPH05215428A (en) | 1992-02-04 | 1992-02-04 | Multi-room air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05215428A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008170130A (en) * | 2007-01-15 | 2008-07-24 | Mitsubishi Electric Corp | Air conditioner |
| CN107990586A (en) * | 2017-12-28 | 2018-05-04 | 福建工程学院 | A kind of multiple while refrigerating and heating air conditioner system and its control method |
-
1992
- 1992-02-04 JP JP1865892A patent/JPH05215428A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008170130A (en) * | 2007-01-15 | 2008-07-24 | Mitsubishi Electric Corp | Air conditioner |
| CN107990586A (en) * | 2017-12-28 | 2018-05-04 | 福建工程学院 | A kind of multiple while refrigerating and heating air conditioner system and its control method |
| CN107990586B (en) * | 2017-12-28 | 2023-06-09 | 福建工程学院 | Multi-connected air conditioning system capable of simultaneously refrigerating and heating and control method thereof |
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