JPH11142009A - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JPH11142009A JPH11142009A JP9322288A JP32228897A JPH11142009A JP H11142009 A JPH11142009 A JP H11142009A JP 9322288 A JP9322288 A JP 9322288A JP 32228897 A JP32228897 A JP 32228897A JP H11142009 A JPH11142009 A JP H11142009A
- Authority
- JP
- Japan
- Prior art keywords
- heat exchanger
- temperature
- indoor heat
- refrigerant
- indoor
- 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.)
- Granted
Links
Landscapes
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Air Conditioning Control Device (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、室外機に複数の
室内機を接続して構成される空気調和機に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner constructed by connecting a plurality of indoor units to an outdoor unit.
【０００２】[0002]
【従来の技術】従来の多室空調用マルチ形空気調和機に
おいては、室外機に接続可能な室内機の台数は、室外機
に設けられている接続ポート数によって予め定められ、
このポート数は室外機の能力に概略比例し、能力の大き
な室外機ほどポート数を多くした仕様で作製されてい
る。2. Description of the Related Art In a conventional multi-type air conditioner for multi-room air conditioning, the number of indoor units connectable to the outdoor units is predetermined by the number of connection ports provided in the outdoor units.
The number of ports is approximately proportional to the capacity of the outdoor unit, and the outdoor unit having a higher capacity is manufactured in a specification in which the number of ports is increased.
【０００３】したがって、例えば、室内機の接続台数が
少ないにもかかわらず、これらの合計容量が大きいとき
には、接続ポートに空きが生じてもこの合計容量に応じ
た能力の室外機を選定せざるを得ず、このため、コスト
面で課題を有する空調システムとなる場合がある。Therefore, for example, when the total capacity of these indoor units is large despite the small number of connected indoor units, an outdoor unit having a capacity corresponding to the total capacity has to be selected even if a connection port is vacant. Therefore, the air conditioning system may have a problem in cost.
【０００４】また、室外機に各室内機を互いに並列に接
続する構成であるため、トータルの接続配管長が長くな
り、これによってもコストが高くなると共に、施工が煩
雑なものとなる。Further, since each indoor unit is connected to the outdoor unit in parallel with each other, the total connecting pipe length is increased, which also increases the cost and complicates the construction.
【０００５】このように、従来のマルチ形空気調和機
は、室外機に室内機を並列に接続する構成であることに
起因するコスト面・施工面での課題を有している。そこ
で、例えば特開平９−１７８２７７号公報に、第１・第
２の２台の室内機を直列にして室外機に接続した構成の
空気調和機が提案されている。[0005] As described above, the conventional multi-type air conditioner has problems in cost and construction due to the configuration in which the indoor unit is connected to the outdoor unit in parallel. Therefore, for example, Japanese Patent Application Laid-Open No. Hei 9-178277 proposes an air conditioner having a configuration in which first and second indoor units are connected in series to an outdoor unit.
【０００６】この空気調和機においては、暖房運転時に
は、室外機内における圧縮機からの吐出冷媒が、第１室
内機と第２室内機とに各々内装された室内熱交換器を順
次流通した後に室外熱交換器から圧縮機に返流され、ま
た、室外機内の四路切換弁を上記から切換えたときの冷
房運転時には、圧縮機からの吐出冷媒が、室外熱交換器
から、第２室内機・第１室内機の順で順次通過した後に
圧縮機に返流されるようになっている。[0006] In this air conditioner, during the heating operation, the refrigerant discharged from the compressor in the outdoor unit flows through the indoor heat exchangers respectively installed in the first indoor unit and the second indoor unit, and then flows out of the outdoor unit. During the cooling operation when the four-way switching valve in the outdoor unit is switched from the above, the refrigerant discharged from the compressor is returned from the outdoor heat exchanger to the second indoor unit. After passing through the first indoor unit in order, it is returned to the compressor.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、上記の
ように室内機を直列に接続した構成では、室内機のいず
れか一方が停止状態であっても、圧縮機からの吐出冷媒
はこの停止側の室内機を通しても流通することになり、
この場合に、上記公報記載の装置においては、例えば、
冷房運転時に第２室内機を停止し、第１室内機を運転し
ている状態では、室外熱交換器で凝縮した液冷媒は、停
止中の第２室内機にまず供給され、これを通して流通し
た後に第１室内機に供給されることになるため、運転側
の第１室内機に達するまでに大きなヒートロスを生じ、
これによって、効率が低下するという問題を有してい
る。However, in the configuration in which the indoor units are connected in series as described above, even if one of the indoor units is in the stopped state, the refrigerant discharged from the compressor is in the stopped state. It will also be distributed through indoor units,
In this case, in the device described in the above publication, for example,
In the state where the second indoor unit is stopped during the cooling operation and the first indoor unit is operated, the liquid refrigerant condensed in the outdoor heat exchanger is first supplied to the stopped second indoor unit and circulated through the second indoor unit. Since it is supplied to the first indoor unit later, a large heat loss occurs until the first indoor unit on the driving side is reached,
As a result, there is a problem that the efficiency is reduced.
【０００８】この発明は、上記した問題点に鑑みなされ
たもので、その目的は、室外機に直列に接続された室内
機のうちに停止中のものがあっても、ヒートロスを低減
してより効率的な運転が可能であると共に、さらに、冷
房運転時における停止側室内機での氷結や騒音を抑制し
て空調快適性を向上し得る空気調和機を提供することに
ある。The present invention has been made in view of the above problems, and has as its object to reduce the heat loss even if some of the indoor units connected in series to the outdoor unit are stopped. It is an object of the present invention to provide an air conditioner capable of efficient operation and further suppressing icing and noise in a stop side indoor unit during cooling operation to improve air conditioning comfort.
【０００９】[0009]
【課題を解決するための手段】そこで、本発明の請求項
１の空気調和機は、圧縮機２と室外熱交換器７とが内装
された室外機１に、それぞれ室内熱交換器１５・１８が
内装された第１室内機１４と第２室内機１７とを直列に
接続して成る空気調和機であって、両室内機１４・１７
の一方が停止状態のとき、運転側の室内機から停止側の
室内機へと冷媒が流通するように、冷媒の流通方向を両
室内機の運転停止状態に応じて切換える冷媒流通切換手
段１３を設けていることを特徴としている。Therefore, in the air conditioner according to the first aspect of the present invention, the outdoor unit 1 in which the compressor 2 and the outdoor heat exchanger 7 are installed is provided with the indoor heat exchangers 15 and 18 respectively. Is an air conditioner in which a first indoor unit 14 and a second indoor unit 17 each having therein are connected in series.
When one of the indoor units is in the stop state, the refrigerant flow switching unit 13 that switches the flow direction of the refrigerant according to the operation stop state of both the indoor units so that the refrigerant flows from the indoor unit on the operation side to the indoor unit on the stop side. It is characterized by being provided.
【００１０】この構成によれば、第１室内機１４と第２
室内機１７とのいずれが停止状態であっても、冷媒流通
切換手段１３によって、圧縮機２からの吐出冷媒が先に
運転側の室内機へと供給されるように冷媒の流通方向が
切換えられるので、この間のヒートロスは極力小さく抑
えられ、したがって、より効率的な運転状態を維持する
ことができる。According to this configuration, the first indoor unit 14 and the second indoor unit 14
Regardless of which of the indoor units 17 is in a stopped state, the refrigerant flow switching means 13 switches the refrigerant flow direction such that the refrigerant discharged from the compressor 2 is first supplied to the operating indoor unit. Therefore, the heat loss during this time is suppressed as small as possible, and therefore, a more efficient operation state can be maintained.
【００１１】請求項２の空気調和機は、室外熱交換器７
に接続した液管１１に電動膨張弁１０を介設する一方、
両室内機１４・１７の一方を停止した状態での冷房運転
時、運転側の室内熱交換器を通過した冷媒が、停止側の
室内熱交換器の出口に至る前の温度検出箇所において所
定の過熱度を有する過熱蒸気となるように、上記電動膨
張弁１０の開度を制御する第１開度制御手段３１を設け
ていることを特徴としている。In the air conditioner according to the second aspect, the outdoor heat exchanger
While the electric expansion valve 10 is interposed in the liquid pipe 11 connected to
During the cooling operation in a state where one of the indoor units 14 and 17 is stopped, the refrigerant that has passed through the indoor heat exchanger on the operation side has a predetermined temperature at a temperature detection point before reaching the outlet of the indoor heat exchanger on the stop side. It is characterized in that first opening degree control means 31 for controlling the opening degree of the electric expansion valve 10 is provided so as to generate superheated steam having a degree of superheating.
【００１２】このような構成により、停止側の室内熱交
換器での氷結が抑制される。つまり電動膨張弁１０の開
度を過熱度制御するに際し、従来のように、室外機内に
おける圧縮機への返流ガスの温度を検出してこれが所定
の過熱度を有するように制御するのでは、この室外機と
運転側室内熱交換器との間に存する停止側室内熱交換器
内を流通する際の冷媒状態が定まらず、この停止側室内
熱交換器内でも蒸発が継続しているような冷媒流通状態
では、この停止側室内熱交換器と周囲の滞留している空
気とが蒸発温度に応じて０℃以下に低下する状態を生じ
易い。このときに、この停止側室内熱交換器に氷結が生
じる。[0012] With this configuration, icing in the indoor heat exchanger on the stop side is suppressed. In other words, when controlling the degree of superheating of the opening of the electric expansion valve 10 as in the related art, by detecting the temperature of the gas returning to the compressor in the outdoor unit and controlling the temperature to have a predetermined degree of superheating, The state of the refrigerant flowing through the stop-side indoor heat exchanger existing between the outdoor unit and the operation-side indoor heat exchanger is not determined, and the evaporation continues in the stop-side indoor heat exchanger. In the refrigerant flowing state, a state in which the stop side indoor heat exchanger and the surrounding stagnant air drop to 0 ° C. or lower according to the evaporation temperature easily occurs. At this time, freezing occurs in the stop side indoor heat exchanger.
【００１３】そこで、運転側の室内熱交換器を通過した
冷媒が、停止側室内熱交換器の出口に至る前の温度検出
箇所において所定の過熱度を有する過熱蒸気となるよう
に制御することで、停止側室内熱交換器の温度低下の度
合いが抑えられ、この結果、氷結の発生が抑制される。Therefore, by controlling the refrigerant passing through the indoor heat exchanger on the operation side to become superheated steam having a predetermined degree of superheat at a temperature detection point before reaching the outlet of the stop side indoor heat exchanger. In addition, the degree of temperature decrease in the stop-side indoor heat exchanger is suppressed, and as a result, the occurrence of icing is suppressed.
【００１４】請求項３の空気調和機は、上記した第１開
度制御手段３１によって、運転側の室内熱交換器を通過
した冷媒を停止側の室内熱交換器に流入させる配管中で
の冷媒温度を運転側の室内熱交換器内の冷媒温度以下と
し、かつ、上記配管中での冷媒温度に対し、停止側の室
内熱交換器内で所定の過熱度を有する過熱蒸気となるよ
うに制御することを特徴としている。According to a third aspect of the present invention, in the air conditioner, the refrigerant in the pipe for allowing the refrigerant having passed through the indoor heat exchanger on the operation side to flow into the indoor heat exchanger on the stop side by the first opening control means 31 described above. The temperature is controlled to be equal to or lower than the refrigerant temperature in the indoor heat exchanger on the operation side, and the refrigerant temperature in the pipe is controlled to be superheated steam having a predetermined degree of superheat in the indoor heat exchanger on the stop side. It is characterized by doing.
【００１５】このような構成によって、より安定した過
熱度制御を行わせることが可能となる。つまり、運転側
の室内熱交換器での蒸発温度を基準として停止側室内熱
交換器内で所定の過熱度を付与するように制御する構成
では、これら温度検出箇所間の配管長が長く、この間で
の圧力損失に伴う蒸発温度の温度低下分を推定して過熱
度を設定する必要がある。このとき、実際の圧力損失量
が推定値から大きく変動するおそれがあり、充分な制御
精度を確保し難い。With this configuration, it is possible to perform more stable superheat control. In other words, in a configuration in which a predetermined degree of superheat is applied in the stop-side indoor heat exchanger based on the evaporation temperature in the indoor heat exchanger on the operation side, the pipe length between these temperature detection points is long, and It is necessary to set the superheat by estimating the temperature decrease of the evaporation temperature due to the pressure loss in the above. At this time, the actual amount of pressure loss may greatly fluctuate from the estimated value, and it is difficult to secure sufficient control accuracy.
【００１６】そこで、運転側室内熱交換器から停止側室
内熱交換器に至る間の配管内でも蒸発が継続するよう
に、この配管中での冷媒温度を運転側の室内熱交換器内
の冷媒温度以下とし、そして、この配管中での蒸発温度
を基準として、停止側の室内熱交換器内で所定の過熱度
を有するように制御することで、この場合の両温度検出
箇所間の配管長が短くなる。これにより、この間の圧力
損失の変動量も小さくなるので、精度の良好な安定した
制御状態を維持することができる。Therefore, the refrigerant temperature in this pipe is adjusted so that the evaporation in the pipe from the indoor heat exchanger on the operation side to the indoor heat exchanger on the stop side continues to evaporate. The temperature is set to be equal to or lower than the temperature, and by controlling the evaporation temperature in the pipe as a reference so as to have a predetermined degree of superheat in the indoor heat exchanger on the stop side, the pipe length between the two temperature detection points in this case is controlled. Becomes shorter. As a result, the fluctuation amount of the pressure loss during this period is also reduced, so that a stable control state with good accuracy can be maintained.
【００１７】請求項４の空気調和機は、室外熱交換器７
に接続した液管１１に電動膨張弁１０を介設する一方、
両室内機１４・１７の一方を停止した状態での冷房運転
時、停止側の室内熱交換器内における冷媒温度を運転側
の室内熱交換器内での冷媒温度以下とし、かつ、停止側
の室内熱交換器を通過後の温度検出箇所において所定の
過熱度を有する過熱蒸気となるように、上記電動膨張弁
１０の開度を制御する第２開度制御手段３２を設けてい
ることを特徴としている。In the air conditioner according to the fourth aspect, the outdoor heat exchanger
While the electric expansion valve 10 is interposed in the liquid pipe 11 connected to
During the cooling operation in a state where one of the indoor units 14 and 17 is stopped, the refrigerant temperature in the indoor heat exchanger on the stop side is set to be equal to or lower than the refrigerant temperature in the indoor heat exchanger on the operation side, and A second opening control means 32 for controlling the opening of the electric expansion valve 10 is provided so that superheated steam having a predetermined degree of superheat is obtained at a temperature detection point after passing through the indoor heat exchanger. And
【００１８】このような構成により、停止側室内熱交換
器でのガス流速音の発生を低減することができる。つま
り、運転側室内熱交換器から停止側室内熱交換器へと流
れる冷媒の蒸発が停止側室内熱交換器に流入する前に完
了し、この停止側室内熱交換器に過熱蒸気が高速で流入
する状態ではガス流速音が発生して、停止側の室内快適
性を損なう結果となる。With this configuration, it is possible to reduce the generation of gas flow velocity noise in the stop-side indoor heat exchanger. That is, the evaporation of the refrigerant flowing from the operation side indoor heat exchanger to the stop side indoor heat exchanger is completed before flowing into the stop side indoor heat exchanger, and the superheated steam flows into this stop side indoor heat exchanger at a high speed. In such a state, a gas flow sound is generated, which impairs indoor comfort on the stop side.
【００１９】そこで、停止側室内熱交換器内における冷
媒温度を運転側室内熱交換器内での冷媒温度以下とし、
これによって、冷媒の蒸発を停止側室内熱交換器内まで
継続させた上で、停止側室内熱交換器を通過後の冷媒温
度が所定の過熱度で保持されるように制御することによ
り、前記したガス流速音の発生が防止され、停止室側の
快適性の低下が抑制される。Therefore, the refrigerant temperature in the stop-side indoor heat exchanger is set to be lower than the refrigerant temperature in the operation-side indoor heat exchanger,
Thereby, after continuing the evaporation of the refrigerant to the inside of the stop side indoor heat exchanger, by controlling so that the refrigerant temperature after passing through the stop side indoor heat exchanger is maintained at a predetermined degree of superheat, The generation of the generated gas flow velocity noise is prevented, and a decrease in the comfort on the stop chamber side is suppressed.
【００２０】請求項５の空気調和機は、上記した第２開
度制御手段３２によって、停止側の室内熱交換器内にお
ける冷媒温度に対し、この停止側の室内熱交換器を通過
後に所定の過熱度を有する過熱蒸気となるように制御す
ることを特徴としている。In the air conditioner according to the fifth aspect, the second opening degree control means 32 controls a predetermined temperature after passing through the stop side indoor heat exchanger with respect to the refrigerant temperature in the stop side indoor heat exchanger. It is characterized in that it is controlled so as to become superheated steam having a degree of superheat.
【００２１】すなわち、冷媒の蒸発が停止側室内熱交換
器内まで継続している状態において、過熱度設定の基準
となる蒸発温度としては、運転側室内熱交換器での蒸発
温度を採用することも可能であるが、上記のように停止
側室内熱交換器での蒸発温度を基準とすることで、この
場合も、両温度検出箇所間の配管長が短くなり、したが
って、圧力損失の変動の影響がより少なくなって、精度
の良好な安定した制御状態を維持することができる。That is, in a state where the evaporation of the refrigerant continues to the inside of the stop-side indoor heat exchanger, the evaporation temperature in the operation-side indoor heat exchanger is adopted as the evaporation temperature which is a reference for setting the degree of superheat. Although it is also possible to use the evaporation temperature in the stop-side indoor heat exchanger as described above, also in this case, the pipe length between the two temperature detection points is shortened, and therefore, the fluctuation of the pressure loss is reduced. The influence is lessened, and a stable control state with good accuracy can be maintained.
【００２２】請求項６の空気調和機は、室外熱交換器７
に接続した液管１１に電動膨張弁１０を介設する一方、
両室内機１４・１７の一方を停止した状態での冷房運転
時、運転側の室内熱交換器を通過した冷媒が停止側の室
内熱交換器の出口に至る前の温度検出箇所において所定
の過熱度を有する過熱蒸気となるように上記電動膨張弁
１０の開度を制御する第１開度制御手段３１と、停止側
の室内熱交換器内における冷媒温度を運転側の室内熱交
換器内での冷媒温度以下とし、かつ、停止側の室内熱交
換器を通過後の温度検出箇所において所定の過熱度を有
する過熱蒸気となるように上記電動膨張弁１０の開度を
制御する第２開度制御手段３２と、第２開度制御手段３
２による制御で停止側の室内熱交換器内の冷媒温度が所
定の温度以下になるときに、第２開度制御手段３２によ
る制御から第１開度制御手段３１による制御に切換える
開度制御切換手段３３とを設けていることを特徴として
いる。In the air conditioner according to the sixth aspect, the outdoor heat exchanger
While the electric expansion valve 10 is interposed in the liquid pipe 11 connected to
During the cooling operation with one of the two indoor units 14 and 17 stopped, the refrigerant passing through the indoor heat exchanger on the operation side is overheated at a temperature detection point before reaching the outlet of the indoor heat exchanger on the stop side. Opening control means 31 for controlling the opening degree of the electric expansion valve 10 so as to be superheated steam having a degree, and the refrigerant temperature in the indoor heat exchanger on the stop side in the indoor heat exchanger on the operation side. And a second opening for controlling the opening of the electric expansion valve 10 so that superheated steam having a predetermined degree of superheating is obtained at a temperature detection point after passing through the indoor heat exchanger on the stop side. Control means 32 and second opening control means 3
When the temperature of the refrigerant in the indoor heat exchanger on the stop side becomes lower than or equal to a predetermined temperature by the control by the control unit 2, the control of the opening degree is switched from the control by the second opening control unit 32 to the control by the first opening control unit 31. Means 33 are provided.
【００２３】この構成によれば、まず、ガス流速音の発
生を防止するために、冷媒の蒸発を停止側室内熱交換器
内まで継続させる第２開度制御手段３２による制御を行
う。このときの停止側室内熱交換器の温度状態から、こ
れの制御を継続した場合に氷結が生じるか否かを判別す
ることが可能である。そして、氷結のおそれがあるとき
にだけ、第１開度制御手段３１による制御への切換えを
行う。このような切換制御により、ガス流速音による快
適性の低下を極力抑え、かつ、氷結の発生を抑制するた
めの制御をより的確に行わせることができる。According to this configuration, first, in order to prevent the generation of the gas flow velocity noise, control is performed by the second opening control means 32 for continuing the evaporation of the refrigerant to the inside of the stop side indoor heat exchanger. From the temperature state of the stop-side indoor heat exchanger at this time, it is possible to determine whether or not icing occurs if the control is continued. Then, the control is switched to the control by the first opening control means 31 only when there is a possibility of icing. With such switching control, it is possible to suppress the decrease in comfort due to the gas flow velocity sound as much as possible, and to more accurately perform the control for suppressing the occurrence of icing.
【００２４】[0024]
【発明の実施の形態】次に、この発明の空気調和機の具
体的な実施形態について、図面を参照しつつ詳細に説明
する。Next, a specific embodiment of the air conditioner of the present invention will be described in detail with reference to the drawings.
【００２５】図１に示すように、本実施形態のセパレー
ト形空気調和機における室外機１内には、圧縮機２と、
この圧縮機２の吐出配管３および吸込配管４が接続され
た冷暖切換用の第１四路切換弁５と、この第１四路切換
弁５の一方の切換ポートに第１ガス管６を介して接続さ
れた室外熱交換器７とが内装されている。上記吸込配管
４にはアキュムレータ８が介設されている。また、第１
四路切換弁５の他方の切換ポートに第２ガス管９が接続
される一方、室外熱交換器７には、減圧機構としての電
動膨張弁１０が介設された液管１１が接続されている。
なお、圧縮機２は、その回転速度、つまり圧縮能力を制
御するためのインバータを有するものである。As shown in FIG. 1, the compressor 2 is provided inside the outdoor unit 1 in the separate type air conditioner of the present embodiment.
A first four-way switching valve 5 for cooling and heating switching to which a discharge pipe 3 and a suction pipe 4 of the compressor 2 are connected, and one switching port of the first four-way switching valve 5 through a first gas pipe 6. And an outdoor heat exchanger 7 connected to it. An accumulator 8 is provided in the suction pipe 4. Also, the first
A second gas pipe 9 is connected to the other switching port of the four-way switching valve 5, while a liquid pipe 11 having an electric expansion valve 10 as a pressure reducing mechanism is connected to the outdoor heat exchanger 7. I have.
The compressor 2 has an inverter for controlling the rotation speed, that is, the compression capacity.
【００２６】上記構成の室外機１には、さらに、室内機
接続ユニット１２が付設されている。このユニット１２
には第２四路切換弁（冷媒流通切換手段）１３が内装さ
れており、この第２四路切換弁１３に、上記した液管１
１と第２ガス管９とが接続されている。この第２四路切
換弁１３の一方の切換ポートに、第１室内機１４に内装
されている第１室内熱交換器１５が第１連絡配管１６を
介して接続され、また、第２四路切換弁１３の他方の切
換ポートに、第２室内機１７に内装されている第２室内
熱交換器１８が、第２連絡配管１９を介して接続されて
いる。そして、第１室内熱交換器１５と第２室内熱交換
器１８とが、室内機連絡配管２０によって相互に接続さ
れることにより、前記圧縮機２から吐出される冷媒が、
室外熱交換器７と両室内熱交換器１５・１８とを順次通
過して圧縮機２に返流される冷媒循環回路が形成されて
いる。The outdoor unit 1 having the above configuration is further provided with an indoor unit connection unit 12. This unit 12
Is provided with a second four-way switching valve (refrigerant flow switching means) 13.
The first and second gas pipes 9 are connected. A first indoor heat exchanger 15 provided in the first indoor unit 14 is connected to one switching port of the second four-way switching valve 13 through a first communication pipe 16. A second indoor heat exchanger 18 provided inside the second indoor unit 17 is connected to the other switching port of the switching valve 13 via a second communication pipe 19. The first indoor heat exchanger 15 and the second indoor heat exchanger 18 are connected to each other by the indoor unit communication pipe 20, so that the refrigerant discharged from the compressor 2 is
A refrigerant circulation circuit is formed, which passes through the outdoor heat exchanger 7 and the indoor heat exchangers 15 and 18 and returns to the compressor 2.
【００２７】上記した空気調和機においては、第１四路
切換弁５を図中実線で示す切換位置に位置させ、圧縮機
２からの吐出冷媒を室外熱交換器７から各室内熱交換器
１５・１８へと流通させて圧縮機２に返流させること
で、室外熱交換器７が凝縮器、各室内熱交換器１５・１
８がそれぞれ蒸発器として機能して冷房運転が行われ
る。一方、第１四路切換弁５を上記から図中破線で示す
切換位置に切換えて、圧縮機２からの吐出冷媒を各室内
熱交換器１５・１８から室外熱交換器７へと流通させて
圧縮機２に返流させることで、各室内熱交換器１５・１
８が凝縮器、室外熱交換器７が蒸発器として機能して暖
房運転が行われる。In the above-described air conditioner, the first four-way switching valve 5 is located at the switching position shown by the solid line in the figure, and the refrigerant discharged from the compressor 2 is transferred from the outdoor heat exchanger 7 to each of the indoor heat exchangers 15. 18 and return to the compressor 2 so that the outdoor heat exchanger 7 becomes a condenser and each indoor heat exchanger 15.1
8 function as evaporators to perform the cooling operation. On the other hand, the first four-way switching valve 5 is switched from the above to the switching position shown by the broken line in the figure, and the refrigerant discharged from the compressor 2 is allowed to flow from each indoor heat exchanger 15/18 to the outdoor heat exchanger 7. By returning the flow to the compressor 2, each indoor heat exchanger 15.1
The heating operation is performed with 8 serving as a condenser and the outdoor heat exchanger 7 serving as an evaporator.
【００２８】第２四路切換弁１３については、まず、第
１・第２室内機１４・１７を同時に運転する場合には、
予め定められている優先順位、例えば、上記した第１室
内機１４の容量が４．０ｋｗ、第２室内機１７の容量が
１．６ｋｗとすると、容量の大きな第１室内機１４を優
先させた運転状態、すなわち、第１室内機１４が第２室
内機１７よりも冷媒流通経路における上流側となるよう
に、冷房運転時には図中実線で示す切換位置に設定し、
また、暖房運転時には図中破線で示す切換位置に設定す
る。As for the second four-way switching valve 13, first, when the first and second indoor units 14 and 17 are operated simultaneously,
If the capacity of the first indoor unit 14 is 4.0 kW and the capacity of the second indoor unit 17 is 1.6 kW, the first indoor unit 14 having a large capacity is prioritized. During the cooling operation, the operating position, that is, the first indoor unit 14 is set to a switching position indicated by a solid line in the drawing such that the first indoor unit 14 is located upstream of the second indoor unit 17 in the refrigerant flow path,
During the heating operation, the switching position is set to the switching position indicated by the broken line in the figure.
【００２９】一方、第１室内機１４と第２室内機１７と
の一方が停止状態のときには、第２四路切換弁１３は、
運転側の室内機を冷媒流通経路における上流側となるよ
うに切換設定する。例えば第１室内機１４を運転し、第
２室内機１７を停止させた状態（すなわち、第２室内熱
交換器１８に付設されている図示しない室内ファンを作
動させない状態）での冷房運転では、第２四路切換弁１
３は図中実線で示す切換位置に設定する。また、第２室
内機１７を運転し、第１室内機１４を停止させた冷房運
転では、第２四路切換弁１３は図中破線で示す切換位置
に設定する。On the other hand, when one of the first indoor unit 14 and the second indoor unit 17 is in a stopped state, the second four-way switching valve 13
The operation side indoor unit is switched and set to be on the upstream side in the refrigerant flow path. For example, in the cooling operation in a state in which the first indoor unit 14 is operated and the second indoor unit 17 is stopped (that is, an indoor fan (not shown) attached to the second indoor heat exchanger 18 is not operated). Second four-way switching valve 1
3 is set to a switching position indicated by a solid line in the figure. In the cooling operation in which the second indoor unit 17 is operated and the first indoor unit 14 is stopped, the second four-way switching valve 13 is set to a switching position indicated by a broken line in the drawing.
【００３０】このように、一方の室内機が停止している
ときには、運転側の室内機が常に上流側となるように、
第２四路切換弁１３によって冷媒循環経路が切換えられ
ることで、ヒートロスが低減された運転状態を維持する
ことができる。つまり、このような切換えが行われず
に、室外熱交換器７で凝縮した液冷媒が、停止側の室内
機を通過後に運転側の室内機に供給される状態では、停
止側の室内機を通過時に、これが停止中であるとして
も、その室内熱交換器における流路長の長いフィン付き
配管を通過する際に周囲からの吸熱をある程度生じてし
まい、これによって、大きなヒートロスを生じてしま
う。Thus, when one indoor unit is stopped, the indoor unit on the operating side is always on the upstream side.
The refrigerant circulation path is switched by the second four-way switching valve 13, so that the operating state in which the heat loss is reduced can be maintained. That is, in a state where the liquid refrigerant condensed in the outdoor heat exchanger 7 is supplied to the operation side indoor unit after passing through the stop side indoor unit without such switching, the passage through the stop side indoor unit is performed. Sometimes, even when the indoor heat exchanger is stopped, a certain amount of heat is absorbed from the surroundings when passing through the finned pipe having a long flow path in the indoor heat exchanger, thereby causing a large heat loss.
【００３１】そこで、上記のように、一方の室内機が停
止しているときには、運転側の室内機が常に上流側とな
るように冷媒循環経路を切換えることで、上記したヒー
トロスの低減された運転状態が維持される。Therefore, as described above, when one indoor unit is stopped, the refrigerant circulation path is switched such that the indoor unit on the operating side is always on the upstream side, so that the operation with reduced heat loss is performed. The state is maintained.
【００３２】なお、暖房運転において一方の室内機が停
止状態のとき、例えば、第１室内機１４を運転し、第２
室内機１７を停止させた状態のときは、第２四路切換弁
１３は図中破線で示す切換位置に、また、第１室内機１
４を停止、第２室内機１７を運転させた状態のときは、
第２四路切換弁１３は図中実線で示す切換位置に設定さ
れることになる。When one of the indoor units is stopped in the heating operation, for example, the first indoor unit 14 is operated and the second indoor unit 14 is operated.
When the indoor unit 17 is stopped, the second four-way switching valve 13 is in the switching position indicated by the broken line in the drawing, and the first indoor unit 1
4 is stopped and the second indoor unit 17 is operated,
The second four-way switching valve 13 is set to a switching position indicated by a solid line in the figure.
【００３３】ところで、上記した冷房運転や暖房運転
は、インバータによる圧縮機２の運転周波数が、室内側
の合計負荷の変化に応じて逐次変更されながら運転が継
続される。そして、暖房運転時には、室外熱交換器７で
の蒸発温度と圧縮機２への吸込ガス温度とを検出し、蒸
発温度に対する吸込ガス温度の過熱度が所定の過熱度と
なるように電動膨張弁１０の開度を制御することによっ
て、冷媒循環量が調整される。Incidentally, the above-described cooling operation and heating operation are continued while the operating frequency of the compressor 2 by the inverter is sequentially changed according to the change in the total load on the indoor side. At the time of the heating operation, the evaporating temperature in the outdoor heat exchanger 7 and the temperature of the suction gas to the compressor 2 are detected, and the superheat degree of the suction gas temperature with respect to the evaporating temperature becomes a predetermined degree of superheating. By controlling the opening degree of the refrigerant 10, the refrigerant circulation amount is adjusted.
【００３４】一方、冷房運転時には、各室内熱交換器１
５・１８側での蒸発温度に基づいて、上記と同様の過熱
度制御が行われることになるが、以下、この冷房運転時
の過熱度制御について説明する。On the other hand, during the cooling operation, each indoor heat exchanger 1
The superheat control similar to the above is performed based on the evaporation temperature on the 5.18 side. Hereinafter, the superheat control during the cooling operation will be described.
【００３５】この制御は、第１室内熱交換器１５および
第２室内熱交換器１８での各中心箇所での冷媒温度をそ
れぞれ検出する第１熱交換器温度センサＤC1・第２熱交
換器温度センサＤC2と、前記室内機連絡配管２０を流れ
る冷媒温度を検出するために、第２室内熱交換器１８に
おける室内機連絡配管２０側の端部配管に付設されてい
る熱交換器間温度センサＤL と、前記第２ガス管９での
冷媒温度検出するために、この第２ガス管９に付設され
ているガス管温度センサＤG との各温度センサからの検
出温度信号が入力される過熱度制御装置３０によって行
われる。This control is performed by a first heat exchanger temperature sensor D C1 and a second heat exchanger which respectively detect a refrigerant temperature at each central point in the first indoor heat exchanger 15 and the second indoor heat exchanger 18. In order to detect the temperature of the refrigerant flowing through the indoor unit communication pipe 20 and the temperature sensor D C2 , the temperature between the heat exchangers attached to the end pipe on the indoor unit communication pipe 20 side in the second indoor heat exchanger 18. a sensor D L, to refrigerant temperature detection at the second gas pipe 9, the detection temperature signals from the temperature sensors and the gas pipe temperature sensor D G being attached to the second gas pipe 9 is input This is performed by the superheat control device 30.
【００３６】この過熱度制御装置３０には、後述する停
止側室内機での氷結の発生を抑制するための制御（以
下、氷結防止制御という）を行う第１開度制御部（第１
開度制御手段）３１と、停止側室内機での騒音発生を抑
制するための制御（以下、騒音防止制御という）を行う
第２開度制御部（第２開度制御手段）３２と、これら制
御部３１・３２のいずれの制御を行わせるかを設定する
開度制御切換部（開度制御切換手段）３３とが設けられ
ている。The superheat degree control device 30 includes a first opening degree control unit (first frost prevention control) for performing control (hereinafter referred to as icing prevention control) for suppressing the occurrence of icing in a stop-side indoor unit described later.
An opening control unit) 31, a second opening control unit (second opening control unit) 32 that performs control for suppressing noise generation in the stop-side indoor unit (hereinafter referred to as noise prevention control), and An opening control switching unit (opening control switching unit) 33 for setting which of the control units 31 and 32 is to be controlled is provided.
【００３７】まず、第１・第２室内機１４・１７が共に
運転状態にあり、第２四路切換弁１３が図中実線で示す
切換位置に位置しているときには、室外熱交換器７で凝
縮した液冷媒は第２四路切換弁１３を通して第１室内熱
交換器１５に供給され、この第１室内熱交換器１５から
第２室内熱交換器１８を順次通過した後、第２四路切換
弁１３・第２ガス管９・第１四路切換弁５・吸込配管４
を通して圧縮機２に返流される。First, when both the first and second indoor units 14 and 17 are in operation and the second four-way switching valve 13 is located at the switching position shown by the solid line in the figure, the outdoor heat exchanger 7 The condensed liquid refrigerant is supplied to the first indoor heat exchanger 15 through the second four-way switching valve 13, and after passing through the first indoor heat exchanger 15 and the second indoor heat exchanger 18 sequentially, the second four-way Switching valve 13, second gas pipe 9, first four-way switching valve 5, suction pipe 4
Through to the compressor 2.
【００３８】この冷媒循環状態において、冷媒の蒸発は
第１室内熱交換器１５への流入箇所から開始されるが、
この蒸発を第２室内熱交換器１８まで継続させるために
は、第２熱交換器温度センサＤC2での検出温度ＴC2が、
第１熱交換器温度センサＤC1での検出温度ＴC1、すなわ
ち、第１室内熱交換器１５での蒸発温度と同等以下であ
ること（実際には、配管流れに伴う圧力損失が生じ、圧
力相当飽和温度が冷媒の流れ方向に沿って次第に低下す
ることから、ＴC2＜ＴC1であること）が必要である。そ
して、この条件を満たした上で、ガス管温度センサＤG
での検出温度ＴG が第２熱交換器温度センサＤC2での蒸
発温度ＴC2に対し、所定の過熱度で保持されるように、
電動膨張弁１０の開度を制御することによって、両室の
冷房運転が行われる。In this refrigerant circulation state, the evaporation of the refrigerant is started from the point where it flows into the first indoor heat exchanger 15,
The evaporation in order to continue to the second indoor heat exchanger 18, the detected temperature T C2 of the second heat exchanger temperature sensor D C2,
The detected temperature T C1 of the first heat exchanger temperature sensor D C1 , that is, equal to or lower than the evaporation temperature of the first indoor heat exchanger 15 (actually, a pressure loss occurs due to pipe flow, (T C2 <T C1 ) is necessary because the equivalent saturation temperature gradually decreases along the flow direction of the refrigerant. After satisfying this condition, the gas pipe temperature sensor D G
As the detected temperature T G in the relative evaporation temperature T C2 of the second heat exchanger temperature sensor D C2, are held at a predetermined degree of superheat,
By controlling the opening degree of the electric expansion valve 10, the cooling operation of both the rooms is performed.
【００３９】一方、例えば、第２室内機１７を停止し、
第１室内機１４を運転する場合、まず、第２四路切換弁
１２は、前記したように図中実線で示す切換位置に設定
されるが、このとき、運転側の第１室内熱交換器１５で
の蒸発温度、すなわち、第１熱交換器温度センサＤC1で
の検出温度ＴC1に対して、ガス管温度センサＤG での検
出温度ＴG が所定の設定過熱度だけ高くなるように電動
膨張弁１０の開度制御を行うのでは、停止側の第２室内
熱交換器１８に氷結が生じることがある。On the other hand, for example, the second indoor unit 17 is stopped,
When the first indoor unit 14 is operated, first, the second four-way switching valve 12 is set to the switching position indicated by the solid line in the drawing as described above. At this time, the first indoor heat exchanger on the operating side evaporation temperature at 15, i.e., the detected temperature T C1 of the first heat exchanger temperature sensor D C1, as the detected temperature T G in the gas pipe temperature sensor D G is higher by a predetermined set degree of superheat When the opening control of the electric expansion valve 10 is performed, icing may occur in the second indoor heat exchanger 18 on the stop side.
【００４０】図２には、第１室内機１４を運転し、第２
室内機１７を停止して上記のような制御を行ったときの
第１室内熱交換器１５（運転側室内熱交換器）から第２
室内熱交換器１８（停止側室内熱交換器）を通して流通
する冷媒の温度測定結果の一例を示している。図中、下
段に“□”で示している各点は、第１室内熱交換器１５
の入口箇所および前記室内機連絡配管２０の箇所、第２
室内熱交換器１８の出口箇所での圧力測定結果である。
これらを外挿した直線ＰL に示すように、第１室内熱交
換器１５から第２室内熱交換器１８を流通する際の圧力
損失に応じて圧力は次第に低下する。FIG. 2 shows that the first indoor unit 14 is operated and the second indoor unit 14 is operated.
From the first indoor heat exchanger 15 (operating indoor heat exchanger) when the indoor unit 17 is stopped and the above control is performed,
The example of the temperature measurement result of the refrigerant | coolant which circulates through the indoor heat exchanger 18 (stop side indoor heat exchanger) is shown. In the figure, each point indicated by “□” at the bottom is the first indoor heat exchanger 15.
Of the indoor unit communication pipe 20 and the second
It is a pressure measurement result at the outlet of the indoor heat exchanger 18.
As shown by the extrapolated straight line P L , the pressure gradually decreases in accordance with the pressure loss when flowing from the first indoor heat exchanger 15 to the second indoor heat exchanger 18.
【００４１】一方、図中上段には、上記の“□”で示す
各圧力値で蒸発するとしたときの圧力相当飽和温度を
“△”でそれぞれ示している。これら“△”の各プロッ
ト値を外挿した直線ＳL によって、上記した圧力変化直
線ＰL に対応する飽和温度の変化が示される。そして、
図中“●”で示す実測温度は、第１室内熱交換器１５の
入口から第２室内熱交換器１８の出口に至るまで、この
圧力相当飽和温度の直線ＳL にほぼ沿った温度状態とな
っている。On the other hand, in the upper part of the figure, the saturation temperature corresponding to the pressure when evaporating at each pressure value shown by the above-mentioned "□" is shown by "△", respectively. By the straight line S L extrapolated each plot values of the "△", the change in the saturation temperature corresponding to pressure changes linearly P L as described above is shown. And
Measured temperature shown in FIG. "●", from the inlet of the first indoor heat exchanger 15 up to the outlet of the second indoor heat exchanger 18, and temperature conditions substantially along the straight line S L of the pressure corresponding saturation temperature Has become.
【００４２】すなわち、この場合には、第２室内熱交換
器１８の出口近傍に至るまで蒸発は完了しておらず、圧
力損失によって次第に低下する圧力に対応して、出口近
傍での温度は０℃付近まで低下している。このような運
転状態が継続すると、この停止側での第２室内熱交換器
１８に霜付きが生じ氷結する。That is, in this case, the evaporation is not completed up to the vicinity of the outlet of the second indoor heat exchanger 18, and the temperature near the outlet becomes 0 in response to the pressure gradually reduced by the pressure loss. It has dropped to around ° C. When such an operation state continues, frost is formed on the second indoor heat exchanger 18 on the stop side, and ice is formed.
【００４３】そこで、本実施形態においては、前記第１
開度制御部３１において、上記した氷結の発生を抑制す
るために、停止側の室内機に設けられている温度検出セ
ンサを利用して過熱度制御を行う。つまり、図１におい
て停止側の第２室内熱交換器１８中央の第２熱交換器温
度センサＤC2による温度検出箇所において、この箇所を
流通する冷媒が、所定の過熱度を有する過熱蒸気となる
ように電動膨張弁１０の開度を制御するのである。Therefore, in the present embodiment, the first
In the opening control unit 31, in order to suppress the occurrence of the above-mentioned icing, the degree of superheat is controlled using a temperature detection sensor provided in the indoor unit on the stop side. That is, at the temperature detection location of the second heat exchanger temperature sensor DC2 at the center of the second indoor heat exchanger 18 on the stop side in FIG. 1, the refrigerant flowing through this location becomes superheated steam having a predetermined degree of superheat. Thus, the opening of the electric expansion valve 10 is controlled.
【００４４】なお、このような過熱度制御を行う際、運
転側の第１室内熱交換器１５における第１熱交換器温度
センサＤC1で検出される温度ＴC1を基準とし、これに、
第２熱交換器温度センサＤC2による検出箇所に至るまで
の圧力損失に応じた圧力相当飽和温度の低下を見込んで
所定の過熱度を設定することも可能であるが、この場合
には、両検出箇所間の配管長が長く、したがって、この
間での実際の圧力損失量が推定値から大きく変動するお
それがあり、充分な制御精度を確保し難い。When such superheat control is performed, the temperature T C1 detected by the first heat exchanger temperature sensor D C1 in the first indoor heat exchanger 15 on the operating side is used as a reference.
It is also possible to set a predetermined degree of superheat in anticipation of a decrease in the pressure-equivalent saturation temperature in accordance with the pressure loss up to the location detected by the second heat exchanger temperature sensor D C2. The length of the pipe between the detection points is long, and therefore, the actual pressure loss amount during this period may vary greatly from the estimated value, and it is difficult to secure sufficient control accuracy.
【００４５】そこで、本実施形態では、第２室内熱交換
器１８の入口端に取り付けられている熱交換器間温度セ
ンサＤL での検出温度ＴL を、第１熱交換器温度センサ
ＤC1で検出される温度ＴC1以下とし、かつ、上記検出温
度ＴL に対し、第２熱交換器温度センサＤC2での検出箇
所で所定の過熱度を有するように制御している。つま
り、ＴL がＴC1以下であることにより、熱交換器間温度
センサＤL での取り付け箇所まで蒸発を継続させ、この
箇所での蒸発温度を基準として、第２熱交換器温度セン
サＤC2での検出箇所における所定の過熱度を設定してい
る。この場合には、熱交換器間温度センサＤL と第２熱
交換器温度センサＤC2との間の配管長が短く、したがっ
て、この間の圧力損失の変動量も小さくなるので、精度
の良好な制御状態を維持することができる。Therefore, in this embodiment, the temperature T L detected by the inter-heat exchanger temperature sensor D L attached to the inlet end of the second indoor heat exchanger 18 is used as the first heat exchanger temperature sensor D C1. in the temperature T C1 below to be detected, and, with respect to the detected temperature T L, it is controlled to have a predetermined degree of superheat at the detection point in the second heat exchanger temperature sensor D C2. That is, since T L is equal to or less than T C1 , the evaporation is continued to the mounting position of the inter-heat exchanger temperature sensor D L , and the second heat exchanger temperature sensor D C2 Is set to a predetermined degree of superheat at the detection point. In this case, the pipe length between the inter-heat exchanger temperature sensor D L and the second heat exchanger temperature sensor D C2 is short, and therefore, the fluctuation amount of the pressure loss during this period is also small. The control state can be maintained.
【００４６】図３には、このような制御を行った場合に
おける前記同様の温度測定結果の一例を示している。同
図の場合、実測温度が圧力相当飽和温度の直線ＳL に沿
うのは、停止側の第２室内熱交換器１８における入口側
の領域までであり、したがって、この箇所で冷媒の蒸発
は完了し、以降は、圧力相当飽和温度の直線ＳL に対し
て次第に温度上昇が生じている。そして、この停止側の
第２室内熱交換器１８におけるほぼ中央部で、直線ＳL
上の温度よりも５℃程度高い温度となり、さらに、この
過熱ポイントよりも下流側の各点では、さらに温度が上
昇している。したがって、前記した図２での測定結果に
比し、停止側の第２室内熱交換器１８における最低温度
がより高くなり、この結果、この熱交換器１８全体をよ
り高い温度状態に保持することができるので、氷結が生
じることが抑制される。FIG. 3 shows an example of the same temperature measurement result as described above when such control is performed. In the case of the figure, the measured temperature is along the straight line S L of the pressure-equivalent saturation temperature up to the inlet-side region of the second indoor heat exchanger 18 on the stop side. and, since, gradually rise in temperature with respect to the straight line S L of the pressure corresponding saturation temperature is occurring. Then, at the substantially central portion of the second indoor heat exchanger 18 on the stop side, a straight line S L
The temperature becomes higher than the above temperature by about 5 ° C., and further, at each point downstream of the overheating point, the temperature further rises. Therefore, the minimum temperature in the second indoor heat exchanger 18 on the stop side is higher than the measurement result in FIG. 2 described above, and as a result, the entire heat exchanger 18 is maintained at a higher temperature state. Icing is suppressed.
【００４７】なお、図１において第２室内機１７を運転
し、第１室内機１４を停止したときの冷房運転では、第
２四路切換弁１３を上記から切換えることによって、室
外熱交換器７での凝縮冷媒が第２室内熱交換器１８に流
入して蒸発することになるが、この場合、熱交換器間温
度センサＤL での検出温度ＴL を、第２熱交換器温度セ
ンサＤC2で検出される温度ＴC2以下とし、かつ、上記検
出温度ＴL に対し、第１熱交換器温度センサＤC1で検出
される冷媒温度が所定の過熱度を有するように、電動膨
張弁１０の開度制御が行われることになる。In the cooling operation when the second indoor unit 17 is operated and the first indoor unit 14 is stopped in FIG. 1, the outdoor heat exchanger 7 is switched by switching the second four-way switching valve 13 from the above. While condensing refrigerant at will to evaporate into the second indoor heat exchanger 18, in this case, the detected temperature T L of the temperature sensor D L between the heat exchanger, the second heat exchanger temperature sensor D The temperature of the electric expansion valve 10 is set so as to be equal to or lower than the temperature T C2 detected by C2 , and so that the refrigerant temperature detected by the first heat exchanger temperature sensor D C1 has a predetermined degree of superheat with respect to the detected temperature TL. Is controlled.
【００４８】次に、停止側の室内機での騒音発生を防止
するための前記第２開度制御部３２での制御内容につい
て説明する。Next, a description will be given of the control by the second opening control section 32 for preventing the generation of noise in the indoor unit on the stop side.
【００４９】例えば、第１室外機１４を運転し、第２室
外機１７を停止した状態での冷房運転時において、冷媒
の蒸発が第２室内熱交換器１８に流入する前に完了し、
したがって、過熱蒸気となったガス冷媒が第２室内熱交
換器１８に高速で流入する際にはガス流速音が発生し
て、停止側の室内快適性を損なう結果となる。そこで、
前記した第２開度制御部３２では、このガス流速音の発
生を防止するために、冷媒の蒸発を第２室内熱交換器１
８内まで継続させるように制御する。For example, during the cooling operation in a state where the first outdoor unit 14 is operated and the second outdoor unit 17 is stopped, the evaporation of the refrigerant is completed before flowing into the second indoor heat exchanger 18,
Therefore, when the gas refrigerant that has become the superheated steam flows into the second indoor heat exchanger 18 at a high speed, a gas flow velocity sound is generated, resulting in impaired indoor comfort on the stop side. Therefore,
In the second opening control section 32, the evaporation of the refrigerant is controlled by the second indoor heat exchanger 1 in order to prevent the generation of the gas flow velocity noise.
8 so as to be continued.
【００５０】すなわち、まず、第２熱交換器温度センサ
ＤC2での検出温度ＴC2が、第１熱交換器温度センサＤC1
での検出温度ＴC1以下であること、これによって、第１
室内熱交換器１５での蒸発状態を第２室内熱交換器１８
内まで継続させた上で、第２熱交換器温度センサＤC2で
の検出温度ＴC2に対し、前記ガス管温度センサＤG での
検出温度ＴG が所定の設定過熱度だけ高い状態に保持さ
れるように、電動膨張弁１０の開度を制御するのであ
る。[0050] That is, first, the detected temperature T C2 of the second heat exchanger temperature sensor D C2 is, the first heat exchanger temperature sensor D C1
Is lower than or equal to the detected temperature T C1 at
The evaporation state in the indoor heat exchanger 15 is changed to the second indoor heat exchanger 18.
On which was continued until the internal, with respect to the detected temperature T C2 of the second heat exchanger temperature sensor D C2, holds the detected temperature T G in the gas pipe temperature sensor D G is in a high state for a predetermined set degree of superheat Thus, the opening degree of the electric expansion valve 10 is controlled.
【００５１】これにより、停止側室内熱交換器に流入す
るときの冷媒が湿り状態であることが確保され、この結
果、過熱ガスが高速で流入する際に生じる騒音の発生が
抑制され、停止室側の快適性を維持することができる。As a result, it is ensured that the refrigerant flowing into the stop-side indoor heat exchanger is in a wet state, and as a result, the noise generated when the superheated gas flows at a high speed is suppressed, and the stop chamber is suppressed. Side comfort can be maintained.
【００５２】ところで、上記した第２開度制御部３２に
よる制御では、ガス管温度センサＤG の取り付け部位で
過熱度を付けるものであり、この場合には、第２室内熱
交換器１８の出口側まで蒸発が継続する状態も生じ得
る。すなわち、前記した第１開度制御部３１による氷結
防止制御と相反するものである。そこで、本実施形態で
は、前記した開度制御切換部３３において、第１開度制
御部３１と第２開度制御部３２との各制御の切換えを行
うようになっており、以下、その手順について、図４を
参照して説明する。[0052] In the control by the second opening control unit 32 described above is intended to give the degree of superheat at the attachment site of the gas pipe temperature sensor D G, in this case, the outlet of the second indoor heat exchanger 18 A situation in which evaporation continues to the side may occur. That is, it is contrary to the icing prevention control by the first opening degree control unit 31 described above. Therefore, in the present embodiment, the opening degree control switching section 33 switches between the control of the first opening degree control section 31 and the control of the second opening degree control section 32. Will be described with reference to FIG.
【００５３】一方の室内機を停止した冷房運転が開始さ
れると、同図のように、まず、第２開度制御部３２によ
る騒音防止制御を開始させ（ステップＳ１）、次いで、
この制御状態における停止側の熱交換器温度センサＤCi
での検出温度ＴCiを、所定の基準温度ＴP と比較する
（ステップＳ２）。ＴCiがＴP よりも高ければ、ステッ
プＳ２からＳ１に戻り、したがって、以降も、ＴCiがＴ
P よりも高い状態が維持される限り、上記した騒音防止
制御が継続される。When the cooling operation in which one indoor unit is stopped is started, as shown in the figure, first, the noise prevention control by the second opening control unit 32 is started (step S1), and then,
In this control state, the stop-side heat exchanger temperature sensor D Ci
The detected temperature T Ci in, is compared with a predetermined reference temperature T P (Step S2). If T Ci is higher than T P , the process returns from step S2 to S1, so that T Ci remains T
As long as the state higher than P is maintained, the above-described noise prevention control is continued.
【００５４】上記基準温度ＴP としては、停止側室内熱
交換器内を流通する冷媒の蒸発が出口まで継続したとす
るとき、この室内熱交換器における中央で検出される蒸
発温度と、出口での蒸発温度とについての圧力損失に応
じて見込まれる最大温度差が設定されている。すなわ
ち、熱交換器温度センサＤCiでの検出温度ＴCiが基準温
度ＴP よりも高い場合には、この室内熱交換器内の蒸発
が出口まで継続したときでも、出口での蒸発温度（ＴCi
−ＴP ）は０℃よりも高く、したがって、この停止側室
内熱交換器の全体が０℃よりも高い温度に保持されるの
で、この運転状態を継続しても氷結を生じない。[0054] As the reference temperature T P, when the evaporation of the refrigerant flowing through the stop-side indoor heat exchanger is continued until the outlet, and the evaporation temperature detected by the center of the indoor heat exchanger, the outlet The maximum temperature difference expected according to the pressure loss with respect to the evaporation temperature is set. That is, when the temperature T Ci detected by the heat exchanger temperature sensor D Ci is higher than the reference temperature T P , even if the evaporation inside the indoor heat exchanger continues to the outlet, the evaporation temperature (T Ci
−T P ) is higher than 0 ° C., so that the entire stop side indoor heat exchanger is maintained at a temperature higher than 0 ° C., so that freezing does not occur even if the operation state is continued.
【００５５】一方、検出温度ＴCiが基準温度ＴP 以下の
ときには、この室内熱交換器内の蒸発が出口まで継続し
たときに出口での温度が０℃以下になるおそれが生じ、
このような温度状態であることが前記ステップＳ２で判
別されると、このステップＳ２からＳ３に移行し、第１
開度制御部３１による前記した氷結防止制御に切換え
て、この制御を運転が停止されるまで継続する。On the other hand, when the detected temperature T Ci is lower than the reference temperature T P , the temperature at the outlet may become 0 ° C. or lower when the evaporation in the indoor heat exchanger continues to the outlet.
When it is determined in step S2 that the temperature is in such a state, the process proceeds from step S2 to S3, and the first
The control is switched to the icing prevention control described above by the opening control unit 31, and this control is continued until the operation is stopped.
【００５６】これにより、停止側の熱交換器温度センサ
ＤCiの取り付け位置で所定の過熱度を付ける制御に切換
わり、この停止側室内熱交換器全体の温度の上昇を生じ
させた運転状態となって、氷結の発生が抑制される。As a result, the control is switched to a control in which a predetermined degree of superheat is provided at the position where the heat exchanger temperature sensor D Ci on the stop side is mounted, and the operation state in which the temperature of the entire indoor heat exchanger on the stop side is increased. As a result, the occurrence of freezing is suppressed.
【００５７】以上にこの発明の具体的な実施形態につい
て説明したが、この発明は上記形態に限定されるもので
はなく、この発明の範囲内で種々変更して実施すること
ができる。例えば上記では、第１開度制御部３１による
氷結防止制御において、停止側室内熱交換器への熱交換
器温度センサの取り付け部位で過熱度を付ける制御構成
としたが、例えば第１室内機１４を運転、第２室内機１
７を停止した状態の場合に、第１熱交換器温度センサＤ
C1での検出温度（蒸発温度）ＴC1に対して熱交換器間温
度センサＤL での温度検出部位で冷媒温度が所定の過熱
度を有するように、すなわち、熱交換器間温度センサＤ
L での取り付け部位で過熱度を付けるような制御構成と
することも可能である。Although the specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be implemented with various modifications within the scope of the present invention. For example, in the above description, in the icing prevention control by the first opening degree control unit 31, the control configuration is such that the degree of superheat is set at the mounting position of the heat exchanger temperature sensor to the stop side indoor heat exchanger. , The second indoor unit 1
7 is stopped, the first heat exchanger temperature sensor D
As the coolant temperature has a predetermined degree of superheat with respect to the detected temperature (evaporation temperature) T C1 at C1 by the temperature detecting portion of the temperature sensor D L between the heat exchanger, i.e., heat exchanger between the temperature sensor D
It is also possible to adopt a control configuration in which the degree of superheat is added at the attachment site at L.
【００５８】この場合には、停止側の第２室内熱交換器
１８には、その入口で過熱蒸気となった冷媒が流入し、
したがって、この第２室内熱交換器１８の全体的な温度
状態をより高くすることができるので、氷結が生じるこ
とをより確実に抑えることができる。In this case, the refrigerant, which has become superheated steam at the inlet, flows into the second indoor heat exchanger 18 on the stop side.
Therefore, the overall temperature state of the second indoor heat exchanger 18 can be made higher, so that the occurrence of icing can be suppressed more reliably.
【００５９】一方、上記実施形態では、第２開度制御部
３２による騒音防止制御において、停止側室内熱交換器
への熱交換器温度センサの取り付け部位で検出される蒸
発温度を基準として、ガス管温度センサＤG での温度検
出部位で所定の過熱度を付けるような制御構成とした
が、運転側室内熱交換器から停止側室内熱交換器へと至
る間での圧力損失に伴う蒸発温度の低下が小さいとき
や、変動が少ない場合には、停止側室内熱交換器での検
出温度を運転側室内熱交換器での検出温度以下とする条
件はそのままで、運転側室内熱交換器で検出される蒸発
温度を基準として、ガス管温度センサＤG での温度検出
箇所で所定の過熱度を付けるように構成することも可能
である。On the other hand, in the above-described embodiment, in the noise prevention control by the second opening control section 32, the gas temperature is determined based on the evaporation temperature detected at the mounting portion of the heat exchanger temperature sensor to the stop side indoor heat exchanger. Although the described control arrangement as giving a predetermined degree of superheat at a temperature detection site of a tube temperature sensor D G, the evaporation temperature due to the pressure loss between reaches the stop side indoor heat exchanger from the driver side indoor heat exchanger When the decrease in temperature is small or the fluctuation is small, the condition that the detected temperature at the stop-side indoor heat exchanger is lower than the detected temperature at the operating-side indoor heat exchanger remains unchanged, the basis of the detected evaporating temperature, it is also possible to configure to attach a predetermined degree of superheat at the temperature detection point of a gas pipe temperature sensor D G.
【００６０】また、上記実施形態では、冷房運転の開始
時に、第２開度制御部３２による騒音防止制御を行い、
この結果、停止側室内熱交換器の温度が所定の温度以下
になるときに、第１開度制御部３１による氷結防止制御
に切換える開度制御切換部３３を設けて構成した例を示
したが、例えば、第１開度制御部３１による制御中に、
運転側室内熱交換器での蒸発温度から、停止側室内熱交
換器出口に至るまでの圧力損失に伴う蒸発温度の低下分
を推定し、この推定した出口箇所での蒸発温度が０℃を
超えるときには第２開度制御部３２による制御に適宜切
換えるような切換手段等をさらに設けて構成することも
可能である。Further, in the above embodiment, at the start of the cooling operation, the second opening control unit 32 performs the noise prevention control,
As a result, when the temperature of the stop-side indoor heat exchanger becomes equal to or lower than a predetermined temperature, an example is shown in which the opening degree control switching unit 33 that switches to the icing prevention control by the first opening degree control unit 31 is provided. For example, during the control by the first opening control unit 31,
From the evaporation temperature at the operation side indoor heat exchanger, a decrease in the evaporation temperature due to the pressure loss up to the stop side indoor heat exchanger outlet is estimated, and the estimated evaporation temperature at the outlet point exceeds 0 ° C. Sometimes, it is also possible to further provide a switching means or the like for appropriately switching to the control by the second opening control unit 32.
【００６１】また、上記実施形態においては、室外機７
に第１室内機１４と第２室内機１７との２台の室内機を
直列に接続した構成を挙げたが、これら２台の室内機の
間に、運転／停止がこれら２台の室内機のいずれかに従
属するような他の室内機をさらに設けて、３台以上の複
数の室内機を直列に接続した構成とすることも可能であ
る。この場合に、運転／停止が互いに同一となる室内機
群を第１室内機、或いは第２室内機とみなして本発明を
適用することができる。また、本発明は、複数の接続ポ
ートを備えるマルチ形空気調和機用の室外機における各
接続ポートに、それぞれ複数の室内機を直列に接続させ
た構成の空気調和機にも適用することが可能である。In the above embodiment, the outdoor unit 7
Has described a configuration in which two indoor units, a first indoor unit 14 and a second indoor unit 17, are connected in series, but between these two indoor units, operation / stop is performed between these two indoor units. It is also possible to further provide another indoor unit that depends on any of the above, and to configure a configuration in which three or more indoor units are connected in series. In this case, the present invention can be applied to a group of indoor units whose operation / stop is the same as the first indoor unit or the second indoor unit. Further, the present invention can be applied to an air conditioner having a configuration in which a plurality of indoor units are connected in series to each connection port in an outdoor unit for a multi-type air conditioner having a plurality of connection ports. It is.
【００６２】[0062]
【発明の効果】以上の説明のように、この発明の請求項
１の空気調和機においては、室外機に直列に接続された
第１室内機と第２室内機とのうちの一方が停止状態のと
きに、運転側の室内機から停止側の室内機へと冷媒を流
通させる冷媒流通切換手段を設けているので、圧縮機か
らの吐出冷媒が運転側の室内機へと供給されるまでのヒ
ートロスを極力小さなものとすることができ、したがっ
て、より効率的な運転状態を維持することができる。As described above, in the air conditioner according to the first aspect of the present invention, one of the first indoor unit and the second indoor unit connected in series to the outdoor unit is in a stopped state. In this case, since the refrigerant flow switching means for circulating the refrigerant from the indoor unit on the operation side to the indoor unit on the stop side is provided, it is necessary to wait until the refrigerant discharged from the compressor is supplied to the indoor unit on the operation side. Heat loss can be minimized, and a more efficient operating state can be maintained.
【００６３】請求項２の空気調和機においては、両室内
機の一方を停止した状態での冷房運転時、停止側の室内
熱交換器の出口に至る前の温度検出箇所において所定の
過熱度を有する過熱蒸気となるように第１開度制御手段
によって制御するので、停止側室内熱交換器の温度低下
の度合いが抑えられ、この結果、氷結の発生が抑制され
る。In the air conditioner of the second aspect, during cooling operation with one of the two indoor units stopped, a predetermined degree of superheat is detected at the temperature detection point before reaching the outlet of the stopped indoor heat exchanger. Since the first degree-of-opening control means controls the superheated steam to have a degree, the degree of temperature decrease of the stop side indoor heat exchanger is suppressed, and as a result, the occurrence of icing is suppressed.
【００６４】請求項３の空気調和機においては、上記第
１開度制御手段により、運転側の室内熱交換器を通過し
た後の冷媒を停止側の室内熱交換器に流入させる配管中
での冷媒の蒸発温度を検出し、これに対し、停止側の室
内熱交換器内で所定の過熱度を有する過熱蒸気となるよ
うに制御するので、基準となる蒸発温度の測定箇所から
所定の過熱度を付与するまでの配管長が短くなり、この
間の圧力損失の変動量も小さくなるので、精度の良好な
安定した制御状態を維持することができる。In the air conditioner of the third aspect, the first opening control means allows the refrigerant after passing through the indoor heat exchanger on the operating side to flow into the indoor heat exchanger on the stopping side. Since the evaporating temperature of the refrigerant is detected and controlled to become superheated steam having a predetermined degree of superheat in the indoor heat exchanger on the stop side, the predetermined degree of superheat is determined from the reference evaporation temperature measurement point. Since the length of the pipe until the pressure is given is reduced, and the fluctuation amount of the pressure loss during this period is also reduced, a stable control state with good accuracy can be maintained.
【００６５】請求項４の空気調和機においては、両室内
機の一方を停止した状態での冷房運転時、停止側の室内
熱交換器内に至るまで蒸発状態を継続させ、停止側の室
内熱交換器を通過後に所定の過熱度を有する過熱蒸気と
なるように第２開度制御手段３２によって制御するの
で、過熱蒸気となったガス冷媒が停止側の室内熱交換器
に高速で流入する際のガス流速音の発生が防止され、停
止側の空調快適性の低下が抑制される。In the air conditioner according to the fourth aspect, during the cooling operation in a state where one of the two indoor units is stopped, the evaporating state is continued until the inside of the indoor heat exchanger on the stopped side, and the indoor heat exchanger on the stopped side is cooled. Since the second degree-of-opening control means 32 controls the superheated steam having a predetermined degree of superheat after passing through the exchanger, the gas refrigerant which has become superheated steam flows into the stop-side indoor heat exchanger at a high speed. Is prevented from occurring, and a decrease in air conditioning comfort on the stop side is suppressed.
【００６６】請求項５の空気調和機は、上記第２開度制
御手段３２により、停止側の室内熱交換器内における蒸
発温度を検出し、これに対して所定の過熱度を有する過
熱蒸気となるように制御するので、この場合も、基準と
なる蒸発温度の測定箇所から所定の過熱度を付与するま
での配管長さが短くなり、この間の圧力損失の変動量が
小さくなるので、精度の良好な安定した制御状態を維持
することができる。In the air conditioner according to the fifth aspect, the second opening control means 32 detects the evaporating temperature in the indoor heat exchanger on the stop side, and detects the evaporating temperature having a predetermined degree of superheating. In this case, too, the pipe length from the reference evaporating temperature measurement point to the application of a predetermined degree of superheat is shortened, and the amount of change in pressure loss during this period is reduced. A good and stable control state can be maintained.
【００６７】請求項６の空気調和機は、上記した第２開
度制御手段による制御で停止側の室内熱交換器の温度が
所定の温度以下になるときに、第２開度制御手段による
制御から第１開度制御手段による制御に切換える開度制
御切換手段を設けているので、ガス流速音による快適性
の低下を必要最小限に抑え、かつ、氷結の発生を抑制す
るための制御をより的確に行わせることができる。In the air conditioner according to the present invention, when the temperature of the indoor heat exchanger on the stop side becomes lower than a predetermined temperature by the control by the second opening control means, the control by the second opening control means is performed. The opening degree control switching means for switching from the control to the control by the first opening degree control means is provided, so that the reduction in the comfort due to the gas flow velocity sound is minimized and the control for suppressing the occurrence of icing is improved. It can be performed accurately.
【図１】本発明の一実施形態における空気調和機の構成
を示すもので、制御ブロック図を付記した冷媒回路図で
ある。FIG. 1 shows a configuration of an air conditioner according to an embodiment of the present invention, and is a refrigerant circuit diagram with a control block diagram added thereto.
【図２】上記空気調和機における冷房運転で、圧縮機の
吸込ガス管の部位で過熱度を付けるように制御したとき
の室内熱交換器での冷媒圧力および冷媒温度の測定結果
を示すグラフである。FIG. 2 is a graph showing a measurement result of a refrigerant pressure and a refrigerant temperature in an indoor heat exchanger when a superheat degree is controlled at a portion of a suction gas pipe of a compressor in a cooling operation in the air conditioner. is there.
【図３】上記空気調和機における冷房運転で、停止側の
室内熱交換器の部位で過熱度を付けるように制御したと
きの室内熱交換器での冷媒圧力および冷媒温度の測定結
果を示すグラフである。FIG. 3 is a graph showing the measurement results of the refrigerant pressure and the refrigerant temperature in the indoor heat exchanger when the air conditioner is controlled to apply a degree of superheat at the stop side indoor heat exchanger in the cooling operation. It is.
【図４】上記空気調和機の過熱度制御装置における開度
制御切換部での制御手順を示すフローチャートである。FIG. 4 is a flowchart showing a control procedure in an opening control switching unit in the superheat control device for the air conditioner.
１ 室外機 ２ 圧縮機 ７ 室外熱交換器 １０ 電動膨張弁 １１ 液管 １３ 第２四路切換弁（冷媒流通切換手段） １４ 第１室内機 １５ 第１室内熱交換器 １７ 第２室内機 １８ 第２室内熱交換器 ３０ 過熱度制御装置 ３１ 第１開度制御部（第１開度制御手段） ３２ 第２開度制御部（第２開度制御手段） ３３ 開度制御切換部（開度制御切換手段） DESCRIPTION OF SYMBOLS 1 Outdoor unit 2 Compressor 7 Outdoor heat exchanger 10 Electric expansion valve 11 Liquid pipe 13 Second four-way switching valve (refrigerant flow switching means) 14 First indoor unit 15 First indoor heat exchanger 17 Second indoor unit 18th 2 indoor heat exchanger 30 superheat control device 31 first opening control unit (first opening control unit) 32 second opening control unit (second opening control unit) 33 opening control switching unit (opening control Switching means)
Claims (6)
内装された室外機（１）に、それぞれ室内熱交換器（１
５）（１８）が内装された第１室内機（１４）と第２室
内機（１７）とを直列に接続して成る空気調和機であっ
て、両室内機（１４）（１７）の一方が停止状態のと
き、運転側の室内機から停止側の室内機へと冷媒が流通
するように、冷媒の流通方向を両室内機の運転停止状態
に応じて切換える冷媒流通切換手段（１３）を設けてい
ることを特徴とする空気調和機。1. An outdoor unit (1) in which a compressor (2) and an outdoor heat exchanger (7) are installed is provided with an indoor heat exchanger (1).
5) An air conditioner in which a first indoor unit (14) and a second indoor unit (17) in which (18) is installed are connected in series, and one of both indoor units (14) and (17) is provided. When the air conditioner is in the stopped state, the refrigerant flow switching means (13) for switching the flow direction of the refrigerant in accordance with the operation stopped state of both the indoor units so that the refrigerant flows from the indoor unit on the operating side to the indoor unit on the stopped side. An air conditioner characterized by being provided.
１）に電動膨張弁（１０）を介設する一方、両室内機
（１４）（１７）の一方を停止した状態での冷房運転
時、運転側の室内熱交換器を通過した冷媒が、停止側の
室内熱交換器の出口に至る前の温度検出箇所において所
定の過熱度を有する過熱蒸気となるように、上記電動膨
張弁（１０）の開度を制御する第１開度制御手段（３
１）を設けていることを特徴とする請求項１の空気調和
機。2. A liquid pipe (1) connected to an outdoor heat exchanger (7).
In the cooling operation with the electric expansion valve (10) interposed in 1) and one of the indoor units (14) and (17) stopped, the refrigerant that has passed through the indoor heat exchanger on the operation side stops. First degree-of-opening control means (3) for controlling the degree of opening of the electric expansion valve (10) so as to generate superheated steam having a predetermined degree of superheat at a temperature detection point before reaching the outlet of the indoor heat exchanger on the side.
2. The air conditioner according to claim 1, wherein 1) is provided.
停止側の室内熱交換器に流入させる配管中での冷媒温度
を運転側の室内熱交換器内の冷媒温度以下とし、かつ、
上記配管中での冷媒温度に対し、停止側の室内熱交換器
内で所定の過熱度を有する過熱蒸気となるように、上記
第１開度制御手段（３１）による制御が行われることを
特徴とする請求項２の空気調和機。3. A refrigerant temperature in a pipe through which refrigerant passing through the indoor heat exchanger on the operation side flows into the indoor heat exchanger on the stop side is set to be equal to or lower than a refrigerant temperature in the indoor heat exchanger on the operation side, and
The control by the first opening control means (31) is performed so that the refrigerant temperature in the pipe becomes superheated steam having a predetermined superheat degree in the indoor heat exchanger on the stop side. The air conditioner according to claim 2, wherein
１）に電動膨張弁（１０）を介設する一方、両室内機
（１４）（１７）の一方を停止した状態での冷房運転
時、停止側の室内熱交換器内における冷媒温度を運転側
の室内熱交換器内での冷媒温度以下とし、かつ、停止側
の室内熱交換器を通過後の温度検出箇所において所定の
過熱度を有する過熱蒸気となるように、上記電動膨張弁
（１０）の開度を制御する第２開度制御手段（３２）を
設けていることを特徴とする請求項１の空気調和機。4. A liquid pipe (1) connected to an outdoor heat exchanger (7).
In the cooling operation in which one of the indoor units (14) and (17) is stopped while the electric expansion valve (10) is interposed in 1), the refrigerant temperature in the indoor heat exchanger on the stopped side is set to the operation side. The electric expansion valve (10) so that the temperature of the refrigerant is equal to or lower than the refrigerant temperature in the indoor heat exchanger and the superheated steam having a predetermined degree of superheat is obtained at the temperature detection point after passing through the indoor heat exchanger on the stop side. The air conditioner according to claim 1, further comprising second opening control means (32) for controlling the opening of the air conditioner.
度に対し、この停止側の室内熱交換器を通過後に所定の
過熱度を有する過熱蒸気となるように、上記第２開度制
御手段（３２）による制御が行われることを特徴とする
請求項４の空気調和機。5. The second degree-of-opening control means so that the temperature of the refrigerant in the indoor heat exchanger on the stop side becomes superheated steam having a predetermined degree of superheat after passing through the indoor heat exchanger on the stop side. The air conditioner according to claim 4, wherein the control according to (32) is performed.
１）に電動膨張弁（１０）を介設する一方、両室内機
（１４）（１７）の一方を停止した状態での冷房運転
時、運転側の室内熱交換器を通過した冷媒が停止側の室
内熱交換器の出口に至る前の温度検出箇所において所定
の過熱度を有する過熱蒸気となるように上記電動膨張弁
（１０）の開度を制御する第１開度制御手段（３１）
と、停止側の室内熱交換器内における冷媒温度を運転側
の室内熱交換器内での冷媒温度以下とし、かつ、停止側
の室内熱交換器を通過後の温度検出箇所において所定の
過熱度を有する過熱蒸気となるように上記電動膨張弁
（１０）の開度を制御する第２開度制御手段（３２）
と、第２開度制御手段（３２）による制御で停止側の室
内熱交換器内の冷媒温度が所定の温度以下になるとき
に、第２開度制御手段（３２）による制御から第１開度
制御手段（３１）による制御に切換える開度制御切換手
段（３３）とを設けていることを特徴とする請求項１の
空気調和機。6. A liquid pipe (1) connected to an outdoor heat exchanger (7).
In the cooling operation in which one of the indoor units (14) and (17) is stopped while the electric expansion valve (10) is interposed in 1), the refrigerant that has passed through the indoor heat exchanger on the operation side is stopped. First opening degree control means (31) for controlling the opening degree of the electric expansion valve (10) so as to generate superheated steam having a predetermined degree of superheating at a temperature detection point before reaching the outlet of the indoor heat exchanger.
The refrigerant temperature in the indoor heat exchanger on the stop side is equal to or lower than the refrigerant temperature in the indoor heat exchanger on the operation side, and a predetermined degree of superheat is detected at a temperature detection point after passing through the indoor heat exchanger on the stop side. Second opening control means (32) for controlling the opening of the electric expansion valve (10) so as to generate superheated steam having
And when the temperature of the refrigerant in the indoor heat exchanger on the stop side becomes equal to or lower than a predetermined temperature by the control of the second opening control means (32), the control of the second opening control means (32) causes the first opening. The air conditioner according to claim 1, further comprising an opening degree control switching means (33) for switching to control by the degree control means (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32228897A JP3482845B2 (en) | 1997-11-06 | 1997-11-06 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32228897A JP3482845B2 (en) | 1997-11-06 | 1997-11-06 | Air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11142009A true JPH11142009A (en) | 1999-05-28 |
| JP3482845B2 JP3482845B2 (en) | 2004-01-06 |
Family
ID=18141971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32228897A Expired - Fee Related JP3482845B2 (en) | 1997-11-06 | 1997-11-06 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3482845B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009275969A (en) * | 2008-05-14 | 2009-11-26 | Daikin Ind Ltd | Refrigerating apparatus |
| JP2011169481A (en) * | 2010-02-16 | 2011-09-01 | Fuji Electric Co Ltd | Refrigerant flow controller |
| KR20150011073A (en) * | 2013-07-22 | 2015-01-30 | 엘지전자 주식회사 | Air conditioner |
| CN107062580A (en) * | 2017-03-21 | 2017-08-18 | 珠海格力电器股份有限公司 | It is a kind of to reduce the control method and multi-gang air-conditioner of noise of indoor unit of air conditioner |
| CN110107953A (en) * | 2019-05-14 | 2019-08-09 | 珠海格力电器股份有限公司 | Air-conditioning system and control method |
| CN110542230A (en) * | 2019-09-12 | 2019-12-06 | 广东美的制冷设备有限公司 | air conditioner, control method and device thereof, and computer-readable storage medium |
-
1997
- 1997-11-06 JP JP32228897A patent/JP3482845B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009275969A (en) * | 2008-05-14 | 2009-11-26 | Daikin Ind Ltd | Refrigerating apparatus |
| JP2011169481A (en) * | 2010-02-16 | 2011-09-01 | Fuji Electric Co Ltd | Refrigerant flow controller |
| KR20150011073A (en) * | 2013-07-22 | 2015-01-30 | 엘지전자 주식회사 | Air conditioner |
| CN107062580A (en) * | 2017-03-21 | 2017-08-18 | 珠海格力电器股份有限公司 | It is a kind of to reduce the control method and multi-gang air-conditioner of noise of indoor unit of air conditioner |
| CN110107953A (en) * | 2019-05-14 | 2019-08-09 | 珠海格力电器股份有限公司 | Air-conditioning system and control method |
| CN110542230A (en) * | 2019-09-12 | 2019-12-06 | 广东美的制冷设备有限公司 | air conditioner, control method and device thereof, and computer-readable storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3482845B2 (en) | 2004-01-06 |
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