JPH05203275A - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JPH05203275A JPH05203275A JP3586492A JP3586492A JPH05203275A JP H05203275 A JPH05203275 A JP H05203275A JP 3586492 A JP3586492 A JP 3586492A JP 3586492 A JP3586492 A JP 3586492A JP H05203275 A JPH05203275 A JP H05203275A
- Authority
- JP
- Japan
- Prior art keywords
- indoor
- valve
- electronic expansion
- switching valve
- outdoor
- 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.)
- Withdrawn
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１台の室外ユニットと複
数台の室内ユニットを備え、冷房運転、暖房運転及び冷
・暖房同時運転される空気調和機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner provided with one outdoor unit and a plurality of indoor units and operated in cooling operation, heating operation and simultaneous cooling / heating operation.
【０００２】[0002]
【従来の技術】従来のこの種空気調和機の冷媒回路が図
３に示されている。図３において、１は圧縮機、10は吐
出管で、圧縮機１の吐出側に接続されている。11は吸入
管で、圧縮機１の吸入側に接続されている。３は室外側
熱交換器で、そのガス側は室外側切換弁18及び２を介し
て吐出管10又は吸入管11に選択的に接続される。7A、7
B、7Cは室内側熱交換器、13A 、13B 、13C は第１の室
内側切換弁で、室内側熱交換器7A、7B、7Cのガス側と吐
出管10とを繋ぐ分岐吐出管10A、10B 、10C に介装され
ている。8A、8B、8Cは第２の室内側切換弁で、室内側熱
交換器7A、7B、7Cのガス側と吸入管11とを繋ぐ分岐吸入
管11A 、11B 、11C に介装されている。４は室外側電子
膨張弁で、室外側熱交換器３の液側に配設されている。
6A、6B、6Cは室内側電子膨張弁で、それぞれ室内側熱交
換器7A、7B、7Cの液側に配設されている。12は液冷媒配
管で、室外側電子膨張弁４の液側と複数の室内側電子膨
張弁6A、6B、6Cの液側とを接続している。13は室外側送
風機で、室外側熱交換器３に外気を流過させる。9A、9
B、9Cは室内側送風機で室内側熱交換器7A、7B、7Cに室
内空気を流過させる。５はレシーバで、液冷媒配管12に
介装されている。14はアキュムレ−タで、圧縮機１の吸
入側に介装されている。2. Description of the Related Art A refrigerant circuit of a conventional air conditioner of this type is shown in FIG. In FIG. 3, 1 is a compressor, and 10 is a discharge pipe, which is connected to the discharge side of the compressor 1. The suction pipe 11 is connected to the suction side of the compressor 1. 3 is an outdoor heat exchanger, the gas side of which is selectively connected to the discharge pipe 10 or the suction pipe 11 via the outdoor switching valves 18 and 2. 7A, 7
B and 7C are indoor heat exchangers, 13A, 13B and 13C are first indoor switching valves, which are branch discharge pipes 10A that connect the gas side of the indoor heat exchangers 7A, 7B and 7C to the discharge pipe 10, It is installed in 10B and 10C. Reference numerals 8A, 8B and 8C denote second indoor side switching valves, which are interposed in branch suction pipes 11A, 11B and 11C connecting the gas side of the indoor heat exchangers 7A, 7B and 7C and the suction pipe 11, respectively. An outdoor electronic expansion valve 4 is arranged on the liquid side of the outdoor heat exchanger 3.
6A, 6B, 6C are indoor electronic expansion valves, which are arranged on the liquid side of the indoor heat exchangers 7A, 7B, 7C, respectively. A liquid refrigerant pipe 12 connects the liquid side of the outdoor electronic expansion valve 4 and the liquid sides of the plurality of indoor electronic expansion valves 6A, 6B, 6C. Reference numeral 13 denotes an outdoor blower, which allows the outdoor heat exchanger 3 to pass the outside air. 9A, 9
B and 9C are indoor blowers that allow indoor air to pass through the indoor heat exchangers 7A, 7B, and 7C. A receiver 5 is provided in the liquid refrigerant pipe 12. An accumulator 14 is provided on the suction side of the compressor 1.
【０００３】Ｏは室外ユニットで、この中には圧縮機
１、室外側切換弁２、18、室外側熱交換器３、室外側送
風機13、室外側電子膨張弁４、レシーバ５、アキュムレ
−タ14等が内蔵されている。Ａ、Ｂ、Ｃはそれぞれ室内
ユニットで、室内ユニットＡには室内側熱交換器7A、室
内側電子膨張弁6A及び室内側送風機9Aが内蔵され、室内
ユニットＢには室内側熱交換器7B、室内側電子膨張弁6B
及び室内側送風機9Bが内蔵され、室内ユニットＣには室
内側熱交換器7C、室内側電子膨張弁6C及び室内側送風機
9Cが内蔵されている。17は分岐ユニットで、この中には
吐出管10、吸入管11、分岐吐出管10A 、10B 、10C 、分
岐吸入管11A 、11B 、11C 、第１の室内側切換弁13A 、
13B 、13C 及び第２の室内側切換弁8A、8B、8Cが内臓さ
れている。O is an outdoor unit in which a compressor 1, outdoor switching valves 2 and 18, an outdoor heat exchanger 3, an outdoor blower 13, an outdoor electronic expansion valve 4, a receiver 5, an accumulator. 14 etc. are built in. A, B, and C are indoor units, the indoor unit A includes an indoor heat exchanger 7A, an indoor electronic expansion valve 6A, and an indoor blower 9A, and the indoor unit B has an indoor heat exchanger 7B, Indoor electronic expansion valve 6B
And the indoor blower 9B is built in, and the indoor unit C has an indoor heat exchanger 7C, an indoor electronic expansion valve 6C, and an indoor blower.
Built-in 9C. Reference numeral 17 denotes a branch unit, in which a discharge pipe 10, a suction pipe 11, branch discharge pipes 10A, 10B, 10C, branch suction pipes 11A, 11B, 11C, a first indoor side switching valve 13A,
13B, 13C and the second indoor side switching valves 8A, 8B, 8C are incorporated.
【０００４】冷房運転時、例えば、室内ユニットＡ、Ｂ
を冷房運転、室内ユニットＣを休止する場合には、室外
側電子膨張弁４は全開とされ、室内側電子膨張弁6A、6B
は予め定められた開度とされ、室内側電子膨張弁6Cは全
閉とされる。そして、室外側切換弁18を開、室外側切換
弁２を閉とすることによって室外側熱交換器３は吐出管
10に連通する。第２の室内側切換弁8A、8Bを開、第１の
室内側切換弁13A 、13B を閉とすることによって室内側
熱交換器7A、7Bは吸入管11に連通する。そして、第１の
室内側切換弁13C 及び第２の室内側切換弁8Cは閉とされ
る。すると、圧縮機１で圧縮された冷媒ガスは吐出管1
0、室外側切換弁18を経て室外側熱交換器３に入り、こ
こで室外側送風機13によって送風される外気に放熱する
ことにより凝縮液化して液冷媒となる。次いで、この液
冷媒は全開とされた室外側電子膨張弁４を通過してレシ
ーバ５に入り、ここでガス成分が分離される。レシーバ
５から流出した液冷媒は液冷媒配管12を経て室内側電子
膨張弁6A、6Bに入り、ここで絞られることによって断熱
膨張して気液二相となる。この気液二相の冷媒は室内側
熱交換器7A、7Bに入り、ここで室内側送風機9A、9Bによ
って送風される室内空気を冷却することによって自身は
蒸発気化する。このガス冷媒は分岐吸入管11A 、11B 、
第２の室内側切換弁8A、8B、吸入管11、アキュムレ−タ
14を経て圧縮機１に吸入される。During cooling operation, for example, indoor units A and B
When performing the cooling operation and suspending the indoor unit C, the outdoor electronic expansion valve 4 is fully opened, and the indoor electronic expansion valves 6A and 6B are
Is a predetermined opening, and the indoor electronic expansion valve 6C is fully closed. Then, by opening the outdoor side switching valve 18 and closing the outdoor side switching valve 2, the outdoor side heat exchanger 3 becomes a discharge pipe.
Connect to 10. The indoor heat exchangers 7A and 7B communicate with the suction pipe 11 by opening the second indoor switching valves 8A and 8B and closing the first indoor switching valves 13A and 13B. Then, the first indoor side switching valve 13C and the second indoor side switching valve 8C are closed. Then, the refrigerant gas compressed by the compressor 1 is discharged into the discharge pipe 1
0, enters the outdoor heat exchanger 3 through the outdoor switching valve 18, where heat is radiated to the outside air blown by the outdoor blower 13 to be condensed and liquefied into a liquid refrigerant. Next, this liquid refrigerant passes through the fully opened outdoor electronic expansion valve 4 and enters the receiver 5, where the gas components are separated. The liquid refrigerant flowing out of the receiver 5 enters the indoor-side electronic expansion valves 6A and 6B through the liquid refrigerant pipe 12 and is throttled here to adiabatically expand into a gas-liquid two-phase. The gas-liquid two-phase refrigerant enters the indoor heat exchangers 7A and 7B, where it cools the indoor air blown by the indoor blowers 9A and 9B to evaporate itself. This gas refrigerant is used in the branch suction pipes 11A, 11B,
Second indoor side switching valves 8A, 8B, suction pipe 11, accumulator
It is sucked into the compressor 1 via 14.
【０００５】暖房運転時、例えば、室内ユニットＡ、Ｂ
を暖房運転、室内ユニットＣを休止する場合には、室外
側電子膨張弁４、室内側電子膨張弁6A、6Bは予め定めら
れた開度とされる。そして、室外側切換弁18、室内側切
換弁8A、8B、8C、13C は閉、室外側切換弁２、室内側切
換弁13A 、13B は開とされる。かくして、圧縮機１から
吐出された冷媒は吐出管10、分岐吐出管10A 、10B 、室
内側切換弁13A 、13B を経て室内側熱交換器7A、7Bで凝
縮液化し、室内側電子膨張弁6A、6Bで絞られた後、液冷
媒配管12、レシーバ５を経て室外側電子膨張弁４で断熱
膨張する。次いで、室外側熱交換器３で蒸発気化した
後、室外側切換弁２、吸入管11、アキュムレ−タ14をこ
の順に経て圧縮機１に戻る。During heating operation, for example, indoor units A and B
When the heating operation is performed and the indoor unit C is stopped, the outdoor electronic expansion valve 4 and the indoor electronic expansion valves 6A and 6B are set to predetermined opening degrees. Then, the outdoor switching valve 18 and the indoor switching valves 8A, 8B, 8C and 13C are closed, and the outdoor switching valve 2 and the indoor switching valves 13A and 13B are opened. Thus, the refrigerant discharged from the compressor 1 passes through the discharge pipe 10, the branch discharge pipes 10A and 10B, the indoor side switching valves 13A and 13B to be condensed and liquefied in the indoor heat exchangers 7A and 7B, and the indoor electronic expansion valve 6A. , 6B, and then adiabatically expanded by the outdoor electronic expansion valve 4 via the liquid refrigerant pipe 12 and the receiver 5. Next, after evaporating and evaporating in the outdoor heat exchanger 3, the outdoor switching valve 2, the suction pipe 11, and the accumulator 14 are returned in this order to the compressor 1.
【０００６】冷・暖房同時運転時において、冷房運転さ
れる室内ユニットの数と暖房運転される室内ユニットの
数が等しいとき、例えば、室内ユニットＣを冷房運転、
室内ユニットＡを暖房運転、室内ユニットＢを休止する
場合、室内側電子膨張弁6A、6Cは予め定められた開度と
される。そして、室内側切換弁13A 、8Cは開、室外側切
換弁２、18、室内側切換弁8A、8B、13B 、13C は閉とさ
れる。かくして、圧縮機１から吐出された冷媒は吐出管
10、分岐吐出管10A 、室内側切換弁13A 、室内側熱交換
器7A、室内側電子膨張弁6A、液冷媒配管12、室内側電子
膨張弁6C、室内側熱交換器7C、分岐吸入管11C 、室内側
切換弁8C、吸入管11、アキュムレ−タ14をこの順に経て
圧縮機１に戻る。In the simultaneous cooling / heating operation, when the number of indoor units operated in cooling is equal to the number of indoor units operated in heating, for example, the indoor unit C is operated in cooling operation.
When the indoor unit A is in the heating operation and the indoor unit B is not operating, the indoor electronic expansion valves 6A and 6C are set to predetermined opening degrees. Then, the indoor switching valves 13A and 8C are opened, and the outdoor switching valves 2 and 18 and the indoor switching valves 8A, 8B, 13B and 13C are closed. Thus, the refrigerant discharged from the compressor 1 is discharged from the discharge pipe.
10, branch discharge pipe 10A, indoor switching valve 13A, indoor heat exchanger 7A, indoor electronic expansion valve 6A, liquid refrigerant pipe 12, indoor electronic expansion valve 6C, indoor heat exchanger 7C, branch suction pipe 11C The indoor switching valve 8C, the suction pipe 11, and the accumulator 14 are returned in this order to the compressor 1.
【０００７】冷・暖房同時運転時において、冷房運転さ
れる室内ユニットの数が暖房運転される室内ユニットの
数より多い場合、例えば、室内ユニットＢ、Ｃを冷房運
転、室内ユニットＡを暖房運転するときには、室外側電
子膨張弁４、室内側電子膨張弁6A、6B、6Cは予め定めら
れた開度とされる。そして、室外側切換弁18及び室内側
切換弁13A 、8B、8Cは開、室外側切換弁２、室内側切換
弁8A、13B 、13C は閉とされる。かくして、圧縮機１か
ら吐出された冷媒は吐出管10で分岐し、その一部は室外
側切換弁18、室外側熱交換器３、室外側電子膨張弁４、
レシーバ５を経て液冷媒配管12に入る。残部は分岐吐出
管10A 、室内側切換弁13A 、室内側熱交換器7A、室内側
電子膨張弁6Aを経て液冷媒配管12に入り、先に分岐した
冷媒と合流する。次いで、合流した液冷媒は室内側電子
膨張弁6B、6C、室内側熱交換器7B、7C、分岐吸入管11B
、11C 、室内側切換弁8B、8C、吸入管11、アキュムレ
−タ14をこの順に経て圧縮機１に戻る。In the simultaneous cooling / heating operation, when the number of indoor units to be cooled is larger than the number of indoor units to be heated, for example, the indoor units B and C are cooled and the indoor unit A is heated. At times, the outdoor electronic expansion valve 4 and the indoor electronic expansion valves 6A, 6B, 6C are set to predetermined openings. Then, the outdoor switching valve 18 and the indoor switching valves 13A, 8B, 8C are opened, and the outdoor switching valve 2 and the indoor switching valves 8A, 13B, 13C are closed. Thus, the refrigerant discharged from the compressor 1 is branched by the discharge pipe 10, and a part of it branches to the outdoor switching valve 18, the outdoor heat exchanger 3, the outdoor electronic expansion valve 4,
It enters the liquid refrigerant pipe 12 via the receiver 5. The remaining portion enters the liquid refrigerant pipe 12 through the branch discharge pipe 10A, the indoor switching valve 13A, the indoor heat exchanger 7A, and the indoor electronic expansion valve 6A, and joins with the refrigerant branched earlier. Next, the combined liquid refrigerants are indoor electronic expansion valves 6B and 6C, indoor heat exchangers 7B and 7C, and branch suction pipe 11B.
, 11C, indoor-side switching valves 8B and 8C, the suction pipe 11, and the accumulator 14 in this order, and then returns to the compressor 1.
【０００８】[0008]
【発明が解決しようとする課題】上記従来の空気調和機
においては、各室内ユニットＡ、Ｂ、Ｃの運転モードを
暖房運転から冷房運転に又は冷房運転から暖房運転に切
り換えるとき、冷媒ガスが第２の室内側切換弁8A、8B、
8C又は第１の室内側切換弁13A 、13B 、13C を急激に流
過するため、大きな異音が発生するという不具合があっ
た。In the above conventional air conditioner, when the operation mode of each indoor unit A, B, C is switched from heating operation to cooling operation or from cooling operation to heating operation, the refrigerant gas is 2 indoor side switching valves 8A, 8B,
8C or the first indoor-side switching valves 13A, 13B, and 13C are rapidly passed through, which causes a problem that a large noise is generated.
【０００９】[0009]
【課題を解決するための手段】本発明は上記課題を解決
するために発明されたものであって、その要旨とすると
ころは、圧縮機と、この圧縮機の吐出側に接続された吐
出管と、上記圧縮機の吸込側に接続された吸入管と、室
外側熱交換器と、上記室外側熱交換器の液側に配設され
た室外側電子膨張弁と、上記室外側熱交換器のガス側を
上記吐出管又は上記吸入管に選択的に連通させる室外側
切換弁と、上記複数の室内側熱交換器のガス側と上記吐
出管とを繋ぐ分岐吐出管に介装された第１の室内側切換
弁と、上記複数の室内側熱交換器のガス側と上記吸入管
とを繋ぐ分岐吸入管に介装された第２の室内側切換弁
と、上記複数の室内側熱交換器の液側にそれぞれ配設さ
れた室内側電子膨張弁と、上記室外側電子膨張弁の液側
と上記複数の室内側電子膨張弁の液側とを接続する液冷
媒配管とを備え、冷房運転、暖房運転及び冷・暖房同時
運転される空気調和機において、上記第１の室内側切換
弁に対して並列に接続された第１のバイパス回路に第１
電磁開閉弁と第１絞りを介装するとともに上記第２の室
内側切換弁に対して並列に接続された第２のバイパス回
路に第２電磁開閉弁と第２絞りを介装し、かつ、暖房運
転から冷房運転に切り換える際、上記第１の室内側切換
弁を閉、室内側電子膨張弁を全閉とした状態を所定の時
間維持した後、第２電磁開閉弁を閉、第２の室内側切換
弁、第１電磁開閉弁及び室内側電子膨張弁を開とし、冷
房運転から暖房運転に切り換える際、上記第２の室内側
切換弁及び第２電磁開閉弁を閉、室内側電子膨張弁を全
閉とした状態を所定の時間維持した後、第１電磁開弁を
閉、上記第１の室内側切換弁、第２電磁開閉弁及び室内
側電子膨張弁を開とする制御手段を設けたことを特徴と
する空気調和機にある。SUMMARY OF THE INVENTION The present invention has been invented to solve the above problems, and its gist is to provide a compressor and a discharge pipe connected to the discharge side of the compressor. A suction pipe connected to the suction side of the compressor, an outdoor heat exchanger, an outdoor electronic expansion valve arranged on the liquid side of the outdoor heat exchanger, and the outdoor heat exchanger Of the outdoor side switching valve that selectively communicates the gas side of the discharge pipe or the suction pipe with each other, and the first and second intervening discharge pipes that connect the gas side of the plurality of indoor heat exchangers with the discharge pipe. No. 1 indoor-side switching valve, a second indoor-side switching valve interposed in a branch suction pipe connecting the gas side of the plurality of indoor-side heat exchangers to the suction pipe, and the plurality of indoor-side heat exchanges Electronic expansion valves respectively disposed on the liquid side of the container, the liquid side of the outdoor electronic expansion valves and the plurality of indoor sides In an air conditioner that includes a liquid refrigerant pipe that connects the liquid side of the child expansion valve and is operated in cooling, heating, and cooling / heating simultaneously, the air conditioner is connected in parallel to the first indoor-side switching valve. First in the first bypass circuit
The electromagnetic on-off valve and the first throttle are interposed, and the second bypass valve connected in parallel to the second indoor-side switching valve is provided with the second electromagnetic on-off valve and the second throttle, and When the heating operation is switched to the cooling operation, the first indoor switching valve is closed and the indoor electronic expansion valve is fully closed for a predetermined time, and then the second electromagnetic opening / closing valve is closed and the second electromagnetic opening / closing valve is closed. The indoor switching valve, the first electromagnetic on-off valve, and the indoor electronic expansion valve are opened, and when the cooling operation is switched to the heating operation, the second indoor switching valve and the second electromagnetic opening valve are closed, and the indoor electronic expansion is performed. After maintaining the valve in a fully closed state for a predetermined time, the first electromagnetic open valve is closed, and the first indoor switching valve, the second electromagnetic opening / closing valve, and the indoor electronic expansion valve are opened. The air conditioner is characterized by being provided.
【００１０】[0010]
【作用】本発明においては、上記構成を具えているた
め、暖房運転から冷房運転に切り換える場合には、第１
の室内側切換弁を閉、室内側電子膨張弁を全閉とした状
態が所定の時間維持された後、第２電磁開閉弁が開、第
２の室内側切換弁、第１電磁開閉弁及び室内側電子膨張
弁が開となる。冷房運転から暖房運転に切り換える場合
には、第２の室内側切換弁及び第２電磁開閉弁を閉、室
内側電子膨張弁を全閉とした状態が所定の時間維持され
た後、第１電磁開閉弁が閉、第１の室内側切換弁、第２
電磁開閉弁及び室内側電子膨張弁が開となる。Since the present invention has the above-mentioned structure, when the heating operation is switched to the cooling operation, the first operation is performed.
After the state in which the indoor side switching valve is closed and the indoor side electronic expansion valve is fully closed is maintained for a predetermined time, the second electromagnetic opening / closing valve is opened, the second indoor side switching valve, the first electromagnetic opening / closing valve, and The indoor electronic expansion valve is opened. When switching from the cooling operation to the heating operation, the second indoor switching valve and the second electromagnetic opening / closing valve are closed, and the indoor electronic expansion valve is fully closed for a predetermined time, and then the first electromagnetic valve is opened. The on-off valve is closed, the first indoor-side switching valve, the second
The electromagnetic open / close valve and the indoor electronic expansion valve are opened.
【００１１】[0011]
【実施例】本発明の１実施例が図１及び図２に示されて
いる。図１に示されるように、第１の室内側切換弁13A
に対して並列に接続された第１のバイパス回路20A には
第１電磁開閉弁21A と第１絞り22A が介装されている。
また、第２の室内側切換弁8Aに対して並列に接続された
第２のバイパス回路23A には第２電磁開閉弁25A と第２
絞り24A が介装されている。リモートコントローラ26A
には運転モード選択スイッチ27A が設けられ、このリモ
ートコントローラ26A はハーネスを介して室内ユニット
Ａに内臓されたマイコン28A に接続されている。そし
て、マイコン28A からの指令によって第１及び第２の室
内側切換弁13A 、8A及び室内側電子膨張弁6Aが開閉され
るようになっている。なお、図には省略されているが、
室内ユニットＢ及びＣについても同様に構成されてい
る。そして、他の構成は図３に示す従来のものと同様で
あり、対応する部材には同じ符号が付されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT One embodiment of the present invention is shown in FIGS. As shown in FIG. 1, the first indoor-side switching valve 13A
A first electromagnetic on-off valve 21A and a first throttle 22A are interposed in a first bypass circuit 20A connected in parallel with the first bypass circuit 20A.
Also, the second bypass circuit 23A connected in parallel to the second indoor side switching valve 8A has a second electromagnetic opening / closing valve 25A and a second electromagnetic switching valve 25A.
A diaphragm 24A is installed. Remote controller 26A
The operation mode selection switch 27A is provided in the remote controller 26A, and the remote controller 26A is connected to the microcomputer 28A embedded in the indoor unit A via a harness. The first and second indoor switching valves 13A and 8A and the indoor electronic expansion valve 6A are opened and closed by a command from the microcomputer 28A. Although not shown in the figure,
The indoor units B and C are similarly configured. The other configurations are similar to those of the conventional one shown in FIG. 3, and corresponding members are designated by the same reference numerals.
【００１２】図２には室内ユニットＡの制御フローチャ
ートが示されている。室内ユニットＡの暖房運転時に
は、第１の室内側切換弁13A が開、第２の室内側切換弁
8Aが閉、第１電磁開閉弁21A が閉、第２電磁開閉弁25A
が開、室内側電子膨張弁6Aが室内ユニットＡの負荷に対
応する開度とされる。かくして、圧縮機１から吐出され
た冷媒は吐出管10、分岐吐出管10A 、第１の室内側切換
弁13A 、室内側熱交換器7A、室内側電子膨張弁6A、液冷
媒配管12、レシーバ５、室外側電子膨張弁４、室外側熱
交換器３、室外側切換弁２、アキュムレ−タ14を経て圧
縮機１に戻る。そして、分岐吐出管10A 内から高圧の冷
媒ガスが第２のバイパス回路23A 、第２電磁開閉弁25A
、第２絞り24A 、分岐吸入管11A を経て吸入管11に小
量づつ流入して、吸入管11や分岐吸入管11A に液冷媒や
潤滑油が滞溜するのを防止する。FIG. 2 shows a control flowchart of the indoor unit A. During the heating operation of the indoor unit A, the first indoor side switching valve 13A is opened and the second indoor side switching valve 13A is opened.
8A closed, 1st solenoid valve 21A closed, 2nd solenoid valve 25A
Is opened, and the indoor electronic expansion valve 6A is opened to correspond to the load of the indoor unit A. Thus, the refrigerant discharged from the compressor 1 has a discharge pipe 10, a branch discharge pipe 10A, a first indoor side switching valve 13A, an indoor heat exchanger 7A, an indoor electronic expansion valve 6A, a liquid refrigerant pipe 12, and a receiver 5. , The outdoor electronic expansion valve 4, the outdoor heat exchanger 3, the outdoor switching valve 2, and the accumulator 14 to return to the compressor 1. Then, the high-pressure refrigerant gas from the branch discharge pipe 10A is supplied to the second bypass circuit 23A and the second electromagnetic opening / closing valve 25A.
The second throttle 24A and the branch suction pipe 11A prevent the liquid refrigerant and the lubricating oil from staying in the suction pipe 11 and the branch suction pipe 11A by a small amount flowing into the suction pipe 11.
【００１３】この暖房運転中、運転モード選択スイッチ
27A が操作されて暖房運転から冷房運転に切り換える旨
の信号がリモートコントローラ26A からマイコン28A に
入力されると、このマイコン28A からの指令によって第
１の室内側切換弁13A が閉、室内側電子膨張弁6Aが全閉
とされ、かつ、タイマがONとされる。かくして、室内側
熱交換器7A内の高圧のガス冷媒は第２のバイパス回路23
A 、第２電磁開閉弁25A 、第２絞り24A 、分岐吸入管11
A を経て吸入管11に徐々に流出し、その圧力は吸入圧と
ほぼ等しくなる。During this heating operation, the operation mode selection switch
When the signal to switch from heating operation to cooling operation is input to the microcomputer 28A from the remote controller 26A by operating 27A, the first indoor switching valve 13A is closed by the command from the microcomputer 28A, and indoor electronic expansion is performed. The valve 6A is fully closed and the timer is turned on. Thus, the high-pressure gas refrigerant in the indoor heat exchanger 7A is supplied to the second bypass circuit 23.
A, second solenoid on-off valve 25A, second throttle 24A, branch suction pipe 11
It gradually flows out to the suction pipe 11 via A, and its pressure becomes almost equal to the suction pressure.
【００１４】タイマに設定された所定時間が経過する
と、マイコン28A からの指令によって第２の室内側切換
弁8Aが開、第１電磁開閉弁21A が開、第２電磁開閉弁25
A が閉、室内側電子膨張弁6Aが室内ユニットＡの負荷に
対応する開度とされ、室内ユニットＡは冷房運転とな
る。かくして、圧縮機１から吐出された冷媒は吐出管1
0、室外側切換弁18、室外側熱交換器３、室外側電子膨
張弁４、レシーバ５、液冷媒配管12、室内側電子膨張弁
6A、室内側熱交換器7A、第２の室内側切換弁8A、分岐吸
入管11A 、吸入管11、アキュムレ−タ14をこの順に経て
圧縮機１に戻る。そして、吐出管10内の冷媒ガスが分岐
吐出管10A 、第１のバイパス回路20A 、第１電磁開閉弁
21A 、第１絞り22A を経て小量づつ分岐吸入管11A に流
入し、吐出管10や分岐吐出管10A 内に液冷媒や潤滑油が
滞納するのを防止する。When a predetermined time set in the timer has elapsed, the second indoor switching valve 8A is opened, the first electromagnetic opening / closing valve 21A is opened, and the second electromagnetic opening / closing valve 25 is instructed by the microcomputer 28A.
A is closed, the indoor electronic expansion valve 6A is opened to correspond to the load of the indoor unit A, and the indoor unit A is in the cooling operation. Thus, the refrigerant discharged from the compressor 1 is the discharge pipe 1
0, outdoor switching valve 18, outdoor heat exchanger 3, outdoor electronic expansion valve 4, receiver 5, liquid refrigerant pipe 12, indoor electronic expansion valve
6A, the indoor heat exchanger 7A, the second indoor switching valve 8A, the branch suction pipe 11A, the suction pipe 11, and the accumulator 14 are returned in this order to the compressor 1. Then, the refrigerant gas in the discharge pipe 10 has a branch discharge pipe 10A, a first bypass circuit 20A, and a first electromagnetic opening / closing valve.
It prevents the liquid refrigerant and the lubricating oil from being overdue in the discharge pipe 10 and the branch discharge pipe 10A by inflowing into the branch suction pipe 11A in small amounts via 21A and the first throttle 22A.
【００１５】この冷房運転中、運転モード選択スイッチ
27A が操作されて冷房運転から暖房運転に切り換える旨
の信号がリモートコントローラ26A からマイコン28A に
入力されると、このマイコン28A からの指令によって第
２の室内側側切換弁8Aが閉、室内側電子膨張弁6Aが全閉
とされ、かつ、タイマがONとされる。かくして、吐出管
10内の高圧のガス冷媒が分岐吐出管10A 、第１のバイパ
ス回路20A 、第１電磁開閉弁21A 、第１絞り22A を経て
小量づつ室内側熱交換器7Aに流入し、その圧力は吐出圧
とほぼ等しくなる。タイマに設定された所定時間が経過
するとマイコン28A からの指令によって、第１の室内側
切換弁13A が開、第１電磁開閉弁21A が閉、第２電磁開
閉弁25A が開、室内側電子膨張弁6Aが室内ユニットＡの
負荷に対応する開度とされ、室内ユニットＡは暖房運転
となる。以上、室内ユニットＡの運転モードを切り換え
る場合について説明したが、室内ユニットＢ及びＣも同
様に切り換えられる。During this cooling operation, the operation mode selection switch
When 27A is operated and a signal to switch from cooling operation to heating operation is input from the remote controller 26A to the microcomputer 28A, the second indoor side switching valve 8A is closed by the command from the microcomputer 28A, and the indoor electronic The expansion valve 6A is fully closed, and the timer is turned on. Thus, the discharge pipe
The high-pressure gas refrigerant in 10 flows into the indoor heat exchanger 7A in small amounts via the branch discharge pipe 10A, the first bypass circuit 20A, the first electromagnetic opening / closing valve 21A, and the first throttle 22A, and the pressure is discharged. It is almost equal to the pressure. When the predetermined time set in the timer has passed, the first indoor switching valve 13A is opened, the first electromagnetic opening / closing valve 21A is closed, the second electromagnetic opening / closing valve 25A is opened, and indoor indoor electronic expansion is instructed by a command from the microcomputer 28A. The valve 6A has an opening corresponding to the load of the indoor unit A, and the indoor unit A is in heating operation. The case where the operation mode of the indoor unit A is switched has been described above, but the indoor units B and C can be switched in the same manner.
【００１６】[0016]
【発明の効果】本発明においては、暖房運転から冷房運
転に又はこの逆に切り換える際、室内側熱交換器内の冷
媒ガスの圧力が吸入管又は吐出管内の圧力と均圧された
後、第２又は第１の室内側切換弁が開とされるので、従
来のように冷媒ガスが第２又は第１の室内側切換弁を急
激に流過することがなく、従って、これに基く異音の発
生を防止できる。According to the present invention, when the heating operation is switched to the cooling operation or vice versa, after the pressure of the refrigerant gas in the indoor heat exchanger is equalized with the pressure in the suction pipe or the discharge pipe, Since the second or first indoor-side switching valve is opened, the refrigerant gas does not suddenly flow through the second or first indoor-side switching valve as in the conventional case. Can be prevented.
【図１】本発明の実施例を示す部分的系統図である。FIG. 1 is a partial system diagram showing an embodiment of the present invention.
【図２】上記実施例の制御フローチャートである。FIG. 2 is a control flowchart of the above embodiment.
【図３】従来の空気調和機の冷媒回路図である。FIG. 3 is a refrigerant circuit diagram of a conventional air conditioner.
１ 圧縮機 10 吐出管 11 吸入管 Ｏ 室外ユニット ３ 室外側熱交換器 ２、18 室外側切換弁 ４ 室外側電子膨張弁 Ａ、Ｂ、Ｃ 室内ユニット 7A、7B、7C 室内側熱交換器 13A 第１の室内側切換弁 8A 第２の室内側切換弁 10A 分岐吐出管 11A 分岐吸入管 6A 室内側電子膨張弁 20A 第１のバイパス回路 21A 第１電磁開閉弁 22A 第１絞り 23A 第２のバイパス回路 24A 第２電磁開閉弁 25A 第２絞り 26A リモートコントローラ 27A 運転モード選択スイッチ 28A マイコン 1 compressor 10 discharge pipe 11 intake pipe O outdoor unit 3 outdoor heat exchanger 2, 18 outdoor switching valve 4 outdoor electronic expansion valve A, B, C indoor unit 7A, 7B, 7C indoor heat exchanger 13A No. 1 indoor switching valve 8A 2nd indoor switching valve 10A Branch discharge pipe 11A Branch suction pipe 6A Indoor electronic expansion valve 20A 1st bypass circuit 21A 1st solenoid on-off valve 22A 1st throttle 23A 2nd bypass circuit 24A Second solenoid valve 25A Second throttle 26A Remote controller 27A Operation mode selection switch 28A Microcomputer
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小林 隆之 愛知県西春日井郡西枇杷島町字旭町三丁目 １番地 三菱重工業株式会社エアコン製作 所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takayuki Kobayashi 3-chome, Asahi-cho, Nishibiwajima-cho, Nishi-Kasugai-gun, Aichi Prefecture Mitsubishi Heavy Industries, Ltd. Air Conditioning Factory
Claims (1)
れた吐出管と、上記圧縮機の吸込側に接続された吸入管
と、室外側熱交換器と、上記室外側熱交換器の液側に配
設された室外側電子膨張弁と、上記室外側熱交換器のガ
ス側を上記吐出管又は上記吸入管に選択的に連通させる
室外側切換弁と、上記複数の室内側熱交換器のガス側と
上記吐出管とを繋ぐ分岐吐出管に介装された第１の室内
側切換弁と、上記複数の室内側熱交換器のガス側と上記
吸入管とを繋ぐ分岐吸入管に介装された第２の室内側切
換弁と、上記複数の室内側熱交換器の液側にそれぞれ配
設された室内側電子膨張弁と、上記室外側電子膨張弁の
液側と上記複数の室内側電子膨張弁の液側とを接続する
液冷媒配管とを備え、冷房運転、暖房運転及び冷・暖房
同時運転される空気調和機において、上記第１の室内側
切換弁に対して並列に接続された第１のバイパス回路に
第１電磁開閉弁と第１絞りを介装するとともに上記第２
の室内側切換弁に対して並列に接続された第２のバイパ
ス回路に第２電磁開閉弁と第２絞りを介装し、かつ、暖
房運転から冷房運転に切り換える際、上記第１の室内側
切換弁を閉、室内側電子膨張弁を全閉とした状態を所定
の時間維持した後、第２電磁開閉弁を閉、第２の室内側
切換弁、第１電磁開閉弁及び室内側電子膨張弁を開と
し、冷房運転から暖房運転に切り換える際、上記第２の
室内側切換弁及び第２電磁開閉弁を閉、室内側電子膨張
弁を全閉とした状態を所定の時間維持した後、第１電磁
開弁を閉、上記第１の室内側切換弁、第２電磁開閉弁及
び室内側電子膨張弁を開とする制御手段を設けたことを
特徴とする空気調和機。1. A compressor, a discharge pipe connected to a discharge side of the compressor, a suction pipe connected to a suction side of the compressor, an outdoor heat exchanger, and the outdoor heat exchanger. An outdoor electronic expansion valve disposed on the liquid side of the, an outdoor switching valve that selectively communicates the gas side of the outdoor heat exchanger with the discharge pipe or the suction pipe, and the plurality of indoor heat A first indoor-side switching valve interposed in a branch discharge pipe that connects the gas side of the exchanger and the discharge pipe, and a branch suction pipe that connects the gas side of the plurality of indoor heat exchangers and the suction pipe A second indoor-side switching valve, an indoor-side electronic expansion valve respectively disposed on the liquid sides of the plurality of indoor-side heat exchangers, a liquid side of the outdoor-side electronic expansion valve, and the plurality of indoor-side electronic expansion valves. Air which is provided with a liquid refrigerant pipe connecting the liquid side of the indoor electronic expansion valve of In the harmony machine, the first bypass valve connected in parallel to the first indoor-side switching valve has the first electromagnetic on-off valve and the first throttle and the second bypass circuit.
When the second electromagnetic on-off valve and the second throttle are interposed in the second bypass circuit connected in parallel to the indoor switching valve of the above, and when the heating operation is switched to the cooling operation, the first indoor side After maintaining a state in which the switching valve is closed and the indoor electronic expansion valve is fully closed for a predetermined time, the second electromagnetic opening / closing valve is closed, the second indoor switching valve, the first electromagnetic opening / closing valve, and the indoor electronic expansion When the valve is opened and the cooling operation is switched to the heating operation, the second indoor side switching valve and the second electromagnetic opening / closing valve are closed, and the indoor electronic expansion valve is fully closed for a predetermined time, An air conditioner comprising control means for closing the first electromagnetic opening valve and opening the first indoor switching valve, the second electromagnetic opening / closing valve, and the indoor electronic expansion valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3586492A JPH05203275A (en) | 1992-01-28 | 1992-01-28 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3586492A JPH05203275A (en) | 1992-01-28 | 1992-01-28 | Air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05203275A true JPH05203275A (en) | 1993-08-10 |
Family
ID=12453858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3586492A Withdrawn JPH05203275A (en) | 1992-01-28 | 1992-01-28 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05203275A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2634510A1 (en) | 2012-03-01 | 2013-09-04 | Fujitsu General Limited | Air conditioner |
| US20190390881A1 (en) * | 2018-06-21 | 2019-12-26 | Lennox Industries Inc. | Method and apparatus for charge compensator reheat valve |
| US10663199B2 (en) | 2018-04-19 | 2020-05-26 | Lennox Industries Inc. | Method and apparatus for common manifold charge compensator |
| US10921032B2 (en) | 2014-05-15 | 2021-02-16 | Lennox Industries Inc. | Method of and system for reducing refrigerant pressure in HVAC systems |
-
1992
- 1992-01-28 JP JP3586492A patent/JPH05203275A/en not_active Withdrawn
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2634510A1 (en) | 2012-03-01 | 2013-09-04 | Fujitsu General Limited | Air conditioner |
| JP2013181695A (en) * | 2012-03-01 | 2013-09-12 | Fujitsu General Ltd | Air conditioning device |
| US10088209B2 (en) | 2012-03-01 | 2018-10-02 | Fujitsu General Limited | Air conditioner |
| US10921032B2 (en) | 2014-05-15 | 2021-02-16 | Lennox Industries Inc. | Method of and system for reducing refrigerant pressure in HVAC systems |
| US10663199B2 (en) | 2018-04-19 | 2020-05-26 | Lennox Industries Inc. | Method and apparatus for common manifold charge compensator |
| US10989456B2 (en) | 2018-04-19 | 2021-04-27 | Lennox Industries Inc. | Method and apparatus for common manifold charge compensator |
| US20190390881A1 (en) * | 2018-06-21 | 2019-12-26 | Lennox Industries Inc. | Method and apparatus for charge compensator reheat valve |
| US10830514B2 (en) * | 2018-06-21 | 2020-11-10 | Lennox Industries Inc. | Method and apparatus for charge compensator reheat valve |
| US11512879B2 (en) * | 2018-06-21 | 2022-11-29 | Lennox Industries Inc. | Method and apparatus for charge compensator reheat valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990408 |