JP3511161B2 - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JP3511161B2 JP3511161B2 JP29656697A JP29656697A JP3511161B2 JP 3511161 B2 JP3511161 B2 JP 3511161B2 JP 29656697 A JP29656697 A JP 29656697A JP 29656697 A JP29656697 A JP 29656697A JP 3511161 B2 JP3511161 B2 JP 3511161B2
- Authority
- JP
- Japan
- Prior art keywords
- outdoor
- heat exchanger
- compressor
- 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.)
- Expired - Fee Related
Links
Landscapes
- Air Conditioning Control Device (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、１台もしくは複数
台の室内ユニットと、複数台の室外ユニットとを同一の
配管系統で接続して冷凍サイクルを構成するヒ−トポン
プ式空気調和装置の除霜運転方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump type air conditioner for a refrigeration cycle in which one or a plurality of indoor units and a plurality of outdoor units are connected by the same piping system. Regarding frost driving method.
【０００２】[0002]
【従来の技術】ヒ−トポンプ式空気調和装置を暖房運転
した場合、室外熱交換器の表面に霜がつくことがあり、
霜が熱交換器を塞いでいくことで空気調和装置の熱交換
能力が落ち、快適性に影響する。このため、定期的に着
霜を判定して霜を除く除霜運転を行っている。2. Description of the Related Art When a heat pump type air conditioner is operated for heating, frost may form on the surface of the outdoor heat exchanger,
As frost blocks the heat exchanger, the heat exchange capacity of the air conditioner is reduced, which affects comfort. Therefore, the defrosting operation for removing frost by periodically determining frost formation is performed.
【０００３】除霜運転の方式として、主に２通りの方式
が用いられている。すなわち、一つは四方弁を反転さ
せ、冷房運転と同方向の冷凍サイクル運転をさせて、室
外熱交換器にホットガスを送り込んで表面の霜を解かす
逆サイクル除霜方式である。いま一つは、圧縮機出口よ
り室外熱交換器入口までホットガスをバイパスさせて霜
を解かすホットガスバイパス除霜方式である。逆サイク
ル除霜方式は、室内熱交換器を低熱源（蒸発器）として
利用するため短時間で除霜が可能であるが、冷風が室内
に流出し、冷風感を与えてしまう欠点がある。また、ホ
ットガスバイパス除霜方式は、室外・室内熱交換器とも
高熱源（凝縮器）とするため、室内に冷風感を与えるこ
とが少ないが、除霜時間が長くなる欠点がある。Two types of defrosting operation methods are mainly used. That is, one is a reverse cycle defrosting method in which the four-way valve is reversed and a refrigeration cycle operation in the same direction as the cooling operation is performed, and hot gas is sent to the outdoor heat exchanger to defrost the surface. The other is a hot gas bypass defrosting method in which hot gas is bypassed from the compressor outlet to the outdoor heat exchanger inlet to defrost. The reverse cycle defrosting method enables defrosting in a short time because the indoor heat exchanger is used as a low heat source (evaporator), but has a drawback that cold air flows out into the room to give a cold air feeling. Further, since the hot gas bypass defrosting method uses a high heat source (condenser) for both the outdoor and indoor heat exchangers, it does not give a cold sensation to the room, but it has a drawback that the defrosting time becomes long.
【０００４】ここで、室外ユニットを複数台接続した空
気調和装置がホットガスバイパス除霜運転を行う例とし
て、例えば特開平４−３２４０７５がある。本公知例に
おいては、複数台の室外ユニットのうち、除霜開始すべ
き条件となった室外ユニットに対し、この室外ユニット
から吐出された冷媒をこの室外ユニットの室外熱交換器
に導いて除霜運転をおこなうこととしている。Here, as an example in which an air conditioner connected with a plurality of outdoor units performs a hot gas bypass defrosting operation, there is, for example, JP-A-4-324075. In this publicly known example, among the plurality of outdoor units, for the outdoor unit that has become the condition to start defrosting, the refrigerant discharged from this outdoor unit is guided to the outdoor heat exchanger of this outdoor unit for defrosting. It is supposed to drive.
【０００５】[0005]
【発明が解決しようとする課題】上記従来技術において
は、除霜運転の方式がホットガスバイパス除霜方式であ
るため、冷媒と圧縮機の熱容量が除霜に必要な熱容量に
対し小さい場合に、除霜が良好に行われない（除霜時間
が長くなる、霜の解け残りが生じる）おそれがある。In the above prior art, since the defrosting operation method is the hot gas bypass defrosting method, when the heat capacity of the refrigerant and the compressor is smaller than the heat capacity required for defrosting, There is a risk that defrosting will not be performed properly (defrosting time will become longer, and unfrosted residue will remain).
【０００６】そこで本発明の目的は、室外ユニットを複
数台説即した空気調和装置において除霜運転すべき室外
ユニットに対しホットガスバイパス除霜運転を行う場合
に、良好な除霜運転を行う空気調和装置を提供すること
にある。Therefore, an object of the present invention is to provide a good defrosting operation when performing a hot gas bypass defrosting operation on an outdoor unit to be defrosted in an air conditioner based on a plurality of outdoor units. To provide a harmony device.
【０００７】[0007]
【課題を解決するための手段】上記課題を達成するた
め、本発明は、室内熱交換器及び室内膨張弁を備えた少
なくとも１台の室内ユニットと、圧縮機、四方弁、室外
熱交換器、室外膨張弁を備えた複数台の室外ユニットと
を共用の冷媒配管で接続して構成され、暖房時に圧縮機
から吐出された冷媒が四方弁、室内熱交換器、室内膨張
弁、室外膨張弁及び室外熱交換器を順に経て、四方弁を
介して圧縮機に戻る冷凍サイクルを形成するヒ−トポン
プ式空気調和装置であって、各室外ユニットには圧縮機
出側に切換弁を設けこの切換弁から室外熱交換器入り側
に接続するホットガスバイパス回路を設けており、複数
台の室外ユニットのいずれかが除霜運転すべき状態とな
った時に、除霜運転すべき室外ユニットでは切換弁を作
動させ、圧縮機からの高温冷媒ガスをホットガスバイパ
ス回路を介して自己の室外熱交換器に導くとともに室内
ユニットから戻る冷媒の一部を室外膨張弁を介して自己
の室外熱交換器に導くように制御することを特徴とす
る。[Means for Solving the Problems ]
Therefore, the present invention provides at least one indoor unit including an indoor heat exchanger and an indoor expansion valve, and a plurality of outdoor units including a compressor, a four-way valve, an outdoor heat exchanger, and an outdoor expansion valve.
The refrigerant discharged from the compressor at the time of heating passes through the four-way valve, the indoor heat exchanger, the indoor expansion valve, the outdoor expansion valve and the outdoor heat exchanger in order, and then through the four-way valve. A heat pump type air conditioner that forms a refrigeration cycle that returns to the compressor, in which each outdoor unit is provided with a switching valve on the outlet side of the compressor and a hot gas connected from this switching valve to the inlet side of the outdoor heat exchanger. A bypass circuit is provided so that when one of the multiple outdoor units is in the defrosting operation state, the switching valve is activated in the outdoor unit to be defrosted, and the hot refrigerant gas from the compressor is hot. self a part of the refrigerant through the gas bypass circuit returns from the indoor unit and guides the own outdoor heat exchanger via the outdoor expansion valve
It is characterized in that it is controlled so as to lead to the outdoor heat exchanger.
【０００８】また、隣合う室外ユニットそれぞれの圧縮
機入り側同志を接続する接続配管とこの配管の両端部に
冷媒制御弁とを設け、両冷媒制御弁を開いて接続配管を
通じて、除霜運転の室内ユニットで圧縮機に戻る冷媒ガ
スの一部を暖房運転の室外ユニットに移動するように制
御することを特徴とする。 Further, a refrigerant control valve provided at both ends of the connection pipe and the pipe connecting the compressor entry side comrades respective outdoor units fit next, through connection piping open both refrigerant control valve, a defrosting operation It is characterized in that a part of the refrigerant gas returning to the compressor in the indoor unit is controlled to move to the outdoor unit in the heating operation.
【０００９】また、室内熱交換器及び室内膨張弁を備え
た少なくとも１台の室内ユニットと、圧縮機、四方弁、
室外熱交換器、室外膨張弁を備えた複数台の室外ユニッ
トとを共用の冷媒配管で接続して構成され、暖房時に圧
縮機から吐出された冷媒が四方弁、室内熱交換器、室内
膨張弁、室外膨張弁及び室外熱交換器を順に経て、四方
弁を介して圧縮機に戻る冷凍サイクルを形成するヒ−ト
ポンプ式空気調和装置であって、各室外ユニットには圧
縮機出側から分岐し室外熱交換器入り側に接続し、かつ
バイパス制御弁を備えるホットガスバイパス回路を設
け、複数台の室外ユニットのいずれかが除霜運転すべき
状態となった時に、除霜運転すべき室外ユニットではバ
イパス制御弁を作動させ、圧縮機からの高温冷媒ガスを
ホットガスバイパス回路を介して自己の室外熱交換器に
導くとともに室内ユニットから戻る冷媒を室外膨張弁を
介して自己の室外熱交換器に導くように制御し、隣合う
室外ユニットそれぞれの圧縮機入り側同志を接続する接
続配管と該配管の両端部に冷媒制御弁とを設け、両冷媒
制御弁を開いて接続配管を通じて、除霜運転の室内ユニ
ットで圧縮機に戻る冷媒ガスの一部を暖房運転の室外ユ
ニットに移動するように制御する構成にできる。 In addition, an indoor heat exchanger and an indoor expansion valve are provided.
At least one indoor unit, compressor, four-way valve,
Multiple outdoor units with outdoor heat exchanger and outdoor expansion valve
The refrigerant discharged from the compressor during heating passes through the four-way valve, the indoor heat exchanger, the indoor expansion valve, the outdoor expansion valve, and the outdoor heat exchanger in this order, and then the four-way valve. A heat pump type air conditioner that forms a refrigeration cycle that returns to the compressor via a compressor, in which each outdoor unit branches from the compressor outlet side and is connected to the outdoor heat exchanger inlet side and has a bypass control valve. A hot gas bypass circuit is provided to operate the bypass control valve in the outdoor unit to be defrosted when one of the multiple outdoor units is in the defrosting operation state. Is controlled so that the refrigerant is guided to its own outdoor heat exchanger via the hot gas bypass circuit and the refrigerant returning from the indoor unit is guided to its own outdoor heat exchanger via the outdoor expansion valve.
The connection that connects the compressor side of each outdoor unit.
A continuous pipe and a refrigerant control valve at both ends of the pipe are provided, and both refrigerants are
Open the control valve and through the connecting piping to defrost the indoor unit.
Part of the refrigerant gas that returns to the compressor with
It can be configured to control to move to the knit.
【００１０】[0010]
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施の形態を図を
用いて説明する。図１は、本発明の第１の実施の形態と
なる空気調和装置を示し、この装置は複数の室外ユニッ
トの一群と複数の室内ユニットの一群とを互いに接続し
た大容量のマルチ型空気調和装置である。図１は室外ユ
ニット、室内ユニットが２台づつの場合を示している
が、これ以上の台数による組み合わせであってもよい。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an air conditioner according to a first embodiment of the present invention, which is a large-capacity multi-type air conditioner in which a group of a plurality of outdoor units and a group of a plurality of indoor units are connected to each other. Is. Although FIG. 1 shows a case in which there are two outdoor units and two indoor units, a combination of more units may be used.
【００１２】図１において冷凍サイクルは、各室内ユニ
ットＡ、Ｂは、室内熱交換器８、室内熱交換用送風機
９、室内膨張弁10等により構成されており、各室外ユニ
ットＡ、Ｂは、圧縮機１、室外熱交換器２、油分離器
３、四方弁４、アキュ−ムレータ５、冷媒量調整器６、
ガスバイパス制御弁11、室外膨張弁21、切換弁22等によ
り構成されている。なお、図では各構成要素の符号の後
に添字Ａ、Ｂが付されている。 さらに室外ユニット群
と室内ユニット群は共用ガス管19と共用液管20により接
続されている。また、双方向に開閉制御可能な油制御弁
15A、15B（電磁弁）が各室外ユニットＡ，Ｂの油分離器
3A、3B間を接続する均油管18に設けられ、さらにまた、
双方向に開閉制御可能な冷媒制御弁27A、27B（電磁弁）
が、図１に示すごとく、それぞれ室外ユニットＡ，Ｂ内
で配管に接続されている。これらの制御弁15、27および
均油管18を介して、室外ユニットＡと室外ユニットＢと
が接続されている。In the refrigeration cycle shown in FIG. 1, each indoor unit A, B is composed of an indoor heat exchanger 8, an indoor heat exchange blower 9, an indoor expansion valve 10, etc., and each outdoor unit A, B is Compressor 1, outdoor heat exchanger 2, oil separator 3, four-way valve 4, accumulator 5, refrigerant amount regulator 6,
It is composed of a gas bypass control valve 11, an outdoor expansion valve 21, a switching valve 22 and the like. In the figure, suffixes A and B are added after the reference numerals of the respective constituent elements. Further, the outdoor unit group and the indoor unit group are connected by a common gas pipe 19 and a common liquid pipe 20. Also, an oil control valve that can be opened and closed bidirectionally
15A, 15B (solenoid valve) is an oil separator for each outdoor unit A, B
It is provided on the oil leveling pipe 18 that connects between 3A and 3B.
Refrigerant control valves 27A and 27B (solenoid valves) that can be opened and closed bidirectionally
However, as shown in FIG. 1, they are connected to pipes in the outdoor units A and B, respectively. The outdoor unit A and the outdoor unit B are connected via the control valves 15 and 27 and the oil equalizing pipe 18.
【００１３】本実施の形態の空気調和装置は、冷房・暖
房運転とも可能なヒ−トポンプ式空気調和装置である
が、本発明は暖房運転中の冷凍サイクル制御に関わるも
のであるため、暖房運転の動作について説明する。The air conditioner of the present embodiment is a heat pump type air conditioner capable of both cooling and heating operations, but since the present invention relates to the refrigeration cycle control during heating operation, The operation of will be described.
【００１４】暖房運転時、各室外ユニットにおいては、
まず圧縮機１にて圧縮され吐出された高温高圧の冷媒ガ
スが、油分離器３・切換弁22・逆止弁14・四方弁４を経
て各室外ユニットから送り出され、そこで合流して共用
ガス管19を通り、該管19出口で分岐して各室内ユニット
Ａ、Ｂに入り、室内熱交換器８で熱交換（凝縮）されて
液冷媒となる。液冷媒は室内膨張弁10を経て各室内ユニ
ットから出て、そこで合流して共用液管20を通り、該管
20出口で分岐して各室外ユニットＡ、Ｂに入り、冷媒量
調整器６を経て室外膨張弁21で減圧され、室外熱交換器
２で熱交換（蒸発）されて低圧ガス冷媒となり、アキュ
−ムレータ５を経て圧縮機１に戻る。At the time of heating operation, in each outdoor unit,
First, the high-temperature high-pressure refrigerant gas compressed and discharged by the compressor 1 is sent out from each outdoor unit via the oil separator 3, the switching valve 22, the check valve 14, and the four-way valve 4, and joins there to form a common gas. The liquid passes through the pipe 19, branches at the outlet of the pipe 19 and enters each of the indoor units A and B, and is heat-exchanged (condensed) in the indoor heat exchanger 8 to become a liquid refrigerant. The liquid refrigerant exits each indoor unit through the indoor expansion valve 10, joins there, passes through the common liquid pipe 20, and
It branches at the 20th outlet and enters each of the outdoor units A and B, is decompressed by the outdoor expansion valve 21 via the refrigerant amount regulator 6, and is heat-exchanged (evaporated) by the outdoor heat exchanger 2 to become a low-pressure gas refrigerant, and the accumulator It returns to the compressor 1 through the muller 5.
【００１５】ここで、室外ユニットＡにおいて、室外熱
交換器2Aの表面に着霜して除霜運転すべき状態となった
場合に、室外送風機7Aを停止すると同時に室外切換弁22
Aを作動させ、それまで逆止弁14A・四方弁4Aを介して室
内ユニット側へ送られていた高温の冷媒ガスを、逆止弁
14A入り側で分岐するホットガスバイパス回路23Aを通じ
て、室外熱交換器2Aへ送りこむ。一方、室外ユニットＢ
は暖房運転を継続させており、各室内ユニットＡ，Ｂで
熱交換（凝縮）された液冷媒は、共用液管20を通って室
外ユニット側に戻り、管20出口で分岐して、一方は室外
ユニットＢに入り、もう一方は室外ユニットＡの室外膨
張弁21Aを経て室外熱交換器2Aへ入る。室外熱交換器2A
には圧縮機１からホットガスバイパス回路23Aを経て送
られた冷媒と、室内ユニット側から共用液管20を経て室
外膨張弁21Aを通った冷媒とが流れ、そこで熱交換(凝
縮)して、表面の霜を解かす。また、除霜運転中の室外
ユニットＡにおいて、冷媒循環量が多いと判断される状
態となった場合に、冷媒制御弁27A、27Bを開いて、均油
管18を通して室外ユニットＡ内を流れる冷媒の一部を室
外ユニットＢに流す。ここで、逆に室外ユニットＢ内の
冷媒が多い場合は、均油管18を通じ、冷媒の一部を室外
ユニットＢから室外ユニットＡに流す。なお、冷媒制御
弁27A、均油管18および冷媒制御弁27Bからなる経路は、
隣合う室外ユニットＡ、Ｂそれぞれの圧縮機１入り側同
志を接続するものである。Here, in the outdoor unit A, when the surface of the outdoor heat exchanger 2A is frosted and the defrosting operation is to be performed, the outdoor blower 7A is stopped and at the same time, the outdoor switching valve 22.
When A is operated, the high-temperature refrigerant gas that had been sent to the indoor unit side via check valve 14A and four-way valve 4A until then
It is sent to the outdoor heat exchanger 2A through the hot gas bypass circuit 23A branched on the 14A inlet side. On the other hand, the outdoor unit B
Continues heating operation, the liquid refrigerant that has undergone heat exchange (condensation) in each indoor unit A, B returns to the outdoor unit side through the shared liquid pipe 20, branches at the outlet of the pipe 20, and one The outdoor unit B enters, and the other enters the outdoor heat exchanger 2A through the outdoor expansion valve 21A of the outdoor unit A. Outdoor heat exchanger 2A
The refrigerant sent from the compressor 1 through the hot gas bypass circuit 23A and the refrigerant that has passed through the outdoor expansion valve 21A through the shared liquid pipe 20 from the indoor unit side flow therethrough, undergo heat exchange (condensation), Defrost surface frost. Further, in the outdoor unit A during the defrosting operation, when it is determined that the refrigerant circulation amount is large, the refrigerant control valves 27A and 27B are opened, and the refrigerant flowing in the outdoor unit A through the oil equalizing pipe 18 is Pour a part into the outdoor unit B. On the contrary, when there is a large amount of refrigerant in the outdoor unit B, a part of the refrigerant flows from the outdoor unit B to the outdoor unit A through the oil equalizing pipe 18. The path formed by the refrigerant control valve 27A, the oil equalizing pipe 18 and the refrigerant control valve 27B is
The adjoining sides of the compressors 1 of the outdoor units A and B adjacent to each other are connected to each other.
【００１６】一方、室外ユニットＢにおいて、室外熱交
換器2Bの表面に着霜して除霜運転すべき状態となった場
合は、先述の場合と室外ユニットＡ、Ｂの立場が逆転
し、室外ユニットＢが先述の室外ユニットＡの場合と同
様の手順にて除霜運転中、室外ユニットＡは暖房運転を
継続させる。On the other hand, in the outdoor unit B, when the surface of the outdoor heat exchanger 2B is frosted and the defrosting operation should be performed, the positions of the outdoor units A and B are reversed and the outdoor units A and B are reversed. The outdoor unit A continues the heating operation during the defrosting operation in the same procedure as the case where the unit B is the outdoor unit A described above.
【００１７】このように、除霜運転させる室外ユニット
の室外熱交換器に、ホットガスバイパス回路からの冷媒
と共用液管からの冷媒とを入れて除霜運転を行うこと
で、除霜すべき室外熱交換器への冷媒循環量を確保し
て、良好な除霜運転を行うことができる。Thus, the defrosting operation should be performed by putting the refrigerant from the hot gas bypass circuit and the refrigerant from the common liquid pipe into the outdoor heat exchanger of the outdoor unit to be defrosted for defrosting operation. It is possible to secure a sufficient amount of refrigerant circulation to the outdoor heat exchanger and perform a good defrosting operation.
【００１８】上記第１の実施の形態においては、除霜運
転すべき室外ユニットにおいて、切換弁22を切り換える
ことで高温の冷媒ガスがホットガスバイパス回路23Aを
通る構成となっているが、高温の冷媒ガスをホットガス
バイパス回路23Aへ通す手段はこれ以外であっともよ
い。In the first embodiment, in the outdoor unit to be defrosted, the switching valve 22 is switched so that the high-temperature refrigerant gas passes through the hot gas bypass circuit 23A. The means for passing the refrigerant gas to the hot gas bypass circuit 23A may be any other means.
【００１９】別手段を用いた第２の実施の形態となる空
気調和装置を図２に示す。図２において冷凍サイクル
は、室内ユニット側は先述した第１の実施の形態と同一
の構成である。室外ユニット側は圧縮機１、室外熱交換
器２、油分離器３、四方弁４、アキュ−ムレータ５、冷
媒量調整器６、ガスバイパス制御弁11、室外膨張弁21、
ホットガスバイパス制御弁25等により構成されており、
第１の実施の形態に対して室外切換弁22の代わりにホッ
トガスバイパス制御弁25を設けてホットガスバイパス回
路23を構成している点を除けば、同一の構成である。室
外ユニットと室内ユニットとの接続については、第１の
実施の形態と同一の構成である。そして暖房運転の動作
は、第１の実施の形態と同一である。FIG. 2 shows an air conditioner according to a second embodiment using another means. In the refrigeration cycle in FIG. 2, the indoor unit side has the same configuration as that of the first embodiment described above. On the outdoor unit side, a compressor 1, an outdoor heat exchanger 2, an oil separator 3, a four-way valve 4, an accumulator 5, a refrigerant amount regulator 6, a gas bypass control valve 11, an outdoor expansion valve 21,
It consists of a hot gas bypass control valve 25, etc.,
The configuration is the same as that of the first embodiment except that a hot gas bypass control valve 25 is provided instead of the outdoor switching valve 22 to configure the hot gas bypass circuit 23. The connection between the outdoor unit and the indoor unit is the same as that of the first embodiment. The heating operation is the same as that in the first embodiment.
【００２０】室外ユニットＡにおいて、室外熱交換器2A
の表面に着霜して除霜運転すべき状態となった場合に、
室外送風機7Aを停止し、ガスバイパス制御弁11Aを開い
て、圧縮機１から吐出する冷媒を一部、油分離器３出口
側で分岐するガスバイパス13Aを通じ、アキュムレータ5
Aを経て、圧縮機１に戻す。それと共に、ホットガスバ
イパス制御弁25Aを開き、高温の冷媒ガスの一部がホッ
トガスバイパス回路23Aへバイパスされ、室外熱交換器2
Aで熱交換し、表面の霜を解かす。その他の動作ならび
に効果については第１の実施の形態と同一である。In the outdoor unit A, the outdoor heat exchanger 2A
When the surface of the
The outdoor blower 7A is stopped, the gas bypass control valve 11A is opened, and a part of the refrigerant discharged from the compressor 1 is passed through the gas bypass 13A branched at the outlet side of the oil separator 3 and the accumulator 5
Return to compressor 1 via A. At the same time, the hot gas bypass control valve 25A is opened, a part of the high temperature refrigerant gas is bypassed to the hot gas bypass circuit 23A, and the outdoor heat exchanger 2
Heat exchange with A to defrost surface frost. Other operations and effects are the same as those in the first embodiment.
【００２１】また、これまで述べた各実施の形態におい
て、除霜運転すべき室外ユニットが除霜運転中に、ガス
バイパス制御弁11を開弁することで、圧縮機１から吐出
された高温高圧の冷媒ガスの一部が、ガスバイパス流量
調整用絞り装置12、ガスバイパス回路13を通り、アキュ
−ムレータ５手前の低圧ガス配管へバイパスされる。本
制御を用いることで、除霜運転中の室外ユニットにおい
て、圧縮機１へ戻る低温低圧の冷媒ガスの乾き度および
吐出冷媒ガスの過熱度が確保され、圧縮機の信頼性を向
上させることができる。Further, in each of the above-described embodiments, by opening the gas bypass control valve 11 during the defrosting operation of the outdoor unit to be defrosted, the high temperature and high pressure discharged from the compressor 1 is increased. A part of the refrigerant gas is passed through the gas bypass flow rate adjusting expansion device 12 and the gas bypass circuit 13, and is bypassed to the low pressure gas pipe before the accumulator 5. By using this control, the dryness of the low-temperature low-pressure refrigerant gas returning to the compressor 1 and the superheat degree of the discharged refrigerant gas are secured in the outdoor unit during the defrosting operation, and the reliability of the compressor can be improved. it can.
【００２２】[0022]
【発明の効果】本発明によれば、室内ユニットと、複数
台の室外ユニットとを同一の配管系統で接続して冷凍サ
イクルを構成するヒ−トポンプ式空気調和装置におい
て、暖房運転中、少なくとも１台の室外ユニットが除霜
運転すべき状態となった場合、除霜運転すべき室外ユニ
ットから除霜運転させる室外ユニットの室外熱交換器
に、ホットガスバイパス回路からの冷媒と共用液管から
の冷媒とを入れて除霜運転を行うことで、除霜すべき室
外熱交換器への冷媒循環量を確保して、良好な除霜運転
を行うことができる。また、除霜運転させる室外ユニッ
トの冷媒循環量が多いと判断される場合には、除霜運転
させる室外ユニットから他の暖房運転する室外ユニット
に冷媒を流すことで、適切な冷媒循環量を確保できる。According to the present invention, in a heat pump type air conditioner in which an indoor unit and a plurality of outdoor units are connected by the same piping system to form a refrigeration cycle, at least 1 during heating operation. When the outdoor unit of the stand is in a state where it should be defrosted, the outdoor unit that is to be defrosted is connected to the outdoor heat exchanger of the outdoor unit, and the refrigerant from the hot gas bypass circuit and the shared liquid pipe By carrying out the defrosting operation by adding the refrigerant, it is possible to secure a sufficient amount of refrigerant circulation to the outdoor heat exchanger to be defrosted, and to perform a good defrosting operation. Further, when it is determined that the refrigerant circulation amount of the outdoor unit to be defrosted is large, a proper refrigerant circulation amount is secured by flowing the refrigerant from the outdoor unit to be defrosted to another outdoor unit to be heated. it can.
【図１】本発明による空気調和装置の第１の実施の形態
を示す冷媒回路図である。FIG. 1 is a refrigerant circuit diagram showing a first embodiment of an air conditioner according to the present invention.
【図２】本発明による空気調和装置の第２の実施の形態
を示す冷媒回路図である。FIG. 2 is a refrigerant circuit diagram showing a second embodiment of an air conditioner according to the present invention.
１ 圧縮機 ２ 室外熱交換器 ３ 油分離器 ４ 四方弁 ５ アキュムレータ ６ 冷媒量調整器 ７ 室外熱交換器用送風機 ８ 室内熱交換器 ９ 室内熱交換器用送風機 １０ 室内膨張弁 １１ ガスバイパス制御弁 １２ ガスバイパス流量調整用絞り装置 １３ ガスバイパス回路 １４ 逆止弁 １５ 油制御弁 １６ 油流量調整用絞り装置 １７ 油戻管 １８ 均油管 １９ 共用ガス管 ２０ 共用液管 ２１ 室外膨張弁 ２２ 切換弁 ２３ ホットガスバイパス回路 ２４ 低圧側均圧管（切換弁操作用） ２５ ホットガスバイパス制御弁 ２６ ホットガスバイパス流量調整用絞り装置 ２７ 冷媒制御弁 1 compressor 2 outdoor heat exchanger 3 oil separator 4 four-way valve 5 Accumulator 6 Refrigerant amount regulator 7 Blower for outdoor heat exchanger 8 Indoor heat exchanger 9 Blower for indoor heat exchanger 10 Indoor expansion valve 11 Gas bypass control valve 12 Gas bypass flow adjustment throttle device 13 Gas bypass circuit 14 Check valve 15 Oil control valve 16 Throttle device for oil flow rate adjustment 17 Oil return pipe 18 Oil level pipe 19 Common gas pipe 20 common liquid pipe 21 outdoor expansion valve 22 Switching valve 23 Hot gas bypass circuit 24 Low pressure side equalizing pipe (for switching valve operation) 25 Hot gas bypass control valve 26 Throttle device for hot gas bypass flow rate adjustment 27 Refrigerant control valve
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平７−19568（ＪＰ，Ａ) 特開 平４−324075（ＪＰ，Ａ) 特開 平９−119754（ＪＰ，Ａ) 特開 昭63−251770（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) F25B 47/02 530 F24F 11/02 101 F25B 47/02 540 F25B 47/02 570 F25B 13/00 104 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-7-19568 (JP, A) JP-A-4-324075 (JP, A) JP-A-9-119754 (JP, A) JP-A-63- 251770 (JP, A) (58) Fields surveyed (Int.Cl. 7 , DB name) F25B 47/02 530 F24F 11/02 101 F25B 47/02 540 F25B 47/02 570 F25B 13/00 104
Claims (3)
なくとも１台の室内ユニットと、圧縮機、四方弁、室外
熱交換器、室外膨張弁を備えた複数台の室外ユニットと
を共用の冷媒配管で接続して構成され、暖房時に圧縮機
から吐出された冷媒が四方弁、室内熱交換器、室内膨張
弁、室外膨張弁及び室外熱交換器を順に経て、四方弁を
介して圧縮機に戻る冷凍サイクルを形成するヒ−トポン
プ式空気調和装置において、各室外ユニットに圧縮機出
側に切換弁と、該切換弁から室外熱交換器入り側に接続
するホットガスバイパス回路とを設け、複数台の室外ユ
ニットのいずれかが除霜運転すべき状態となった時に、
除霜運転すべき室外ユニットの切換弁を作動させて圧縮
機からの高温冷媒ガスをホットガスバイパス回路を介し
て自己の室外熱交換器に導くとともに室内ユニットから
戻る冷媒を室外膨張弁を介して自己の室外熱交換器に導
くように制御することを特徴とする空気調和装置。1. An at least one indoor unit equipped with an indoor heat exchanger and an indoor expansion valve, and a plurality of outdoor units equipped with a compressor, a four-way valve, an outdoor heat exchanger, and an outdoor expansion valve.
The refrigerant discharged from the compressor at the time of heating passes through the four-way valve, the indoor heat exchanger, the indoor expansion valve, the outdoor expansion valve, and the outdoor heat exchanger in this order, and then through the four-way valve. heat to form a refrigeration cycle back to the compressor Te - in Toponpu type air conditioner, and a switching valve to the compressor delivery side to the outdoor units, and the hot gas bypass circuit that connects the outdoor heat exchanger entry side from the switching valve Is provided, and when one of the multiple outdoor units is in the state for defrosting operation,
Through the outdoor expansion valve refrigerant returning from the indoor unit and guides the own outdoor heat exchanger hot refrigerant gas from the switching valve of the outdoor unit to be operated defrosting by operating the compressor via the hot gas bypass circuit The air conditioner is characterized in that it is controlled so as to be guided to its own outdoor heat exchanger.
て、隣合う室外ユニットそれぞれの圧縮機入り側同志を
接続する接続配管と該配管の両端部に冷媒制御弁とを設
け、両冷媒制御弁を開いて接続配管を通じて、除霜運転
の室外ユニットで圧縮機に戻る冷媒ガスの一部を暖房運
転の室外ユニットに移動するように制御することを特徴
とする空気調和装置。2. The air conditioner according to claim 1, wherein a connection pipe connecting the compressor-entry sides of adjacent outdoor units is provided, and a refrigerant control valve is provided at both ends of the pipe, and both refrigerant control valves are provided. the open through connection piping, air conditioner, characterized in that the part for controlling to move to the outdoor unit of the heating operation of the refrigerant gas returns to the compressor at room outside unit of the defrosting operation.
なくとも１台の室内ユニットと、圧縮機、四方弁、室外
熱交換器、室外膨張弁を備えた複数台の室外ユニットと
を共用の冷媒配管で接続して構成され、暖房時に圧縮機
から吐出された冷媒が四方弁、室内熱交換器、室内膨張
弁、室外膨張弁及び室外熱交換器を順に経て、四方弁を
介して圧縮機に戻る冷凍サイクルを形成するヒ−トポン
プ式空気調和装置において、各室外ユニットに圧縮機出
側から分岐し室外熱交換器入り側に接続しかつバイパス
制御弁を備えるホットガスバイパス回路を設け、複数台
の室外ユニットのいずれかが除霜運転すべき状態となっ
た時に、除霜運転すべき室外ユニットのバイパス制御弁
を作動させて圧縮機からの高温冷媒ガスをホットガスバ
イパス回路を介して自己の室外熱交換器に導くとともに
室内ユニットから戻る冷媒を室外膨張弁を介して自己の
室外熱交換器に導くように制御し、隣合う室外ユニット
それぞれの圧縮機入り側同志を接続する接続配管と該配
管の両端部に冷媒制御弁とを設け、両冷媒制御弁を開い
て接続配管を通じて、除霜運転の室外ユニットで圧縮機
に戻る冷媒ガスの一部を暖房運転の室外ユニットに移動
するように制御することを特徴とする空気調和装置。 3. At least one indoor unit equipped with an indoor heat exchanger and an indoor expansion valve, and a plurality of outdoor units equipped with a compressor, a four-way valve, an outdoor heat exchanger, and an outdoor expansion valve.
The refrigerant discharged from the compressor during heating passes through the four-way valve, the indoor heat exchanger, the indoor expansion valve, the outdoor expansion valve, and the outdoor heat exchanger in this order, and then through the four-way valve. heat to form a refrigeration cycle back to the compressor Te - in Toponpu type air conditioner, branched from compressors delivery side to the outdoor units connected to the outdoor heat exchanger entry side and the hot gas bypass circuit comprises a bypass control valve Is provided, and when any of the plurality of outdoor units is in the defrosting operation state, the bypass control valve of the outdoor unit to be defrosted is operated to supply the hot refrigerant gas from the compressor to the hot gas bypass circuit. through the refrigerant returning from the indoor unit and guides the own outdoor heat exchanger via the outdoor expansion valve control to direct the self <br/> outdoor heat exchanger, adjacent outdoor unit
The connecting pipes and the distribution pipes that connect each
Provide both refrigerant control valves at both ends of the pipe and open both refrigerant control valves
Compressor in the outdoor unit for defrosting operation
Return some of the refrigerant gas to the outdoor unit for heating operation
An air conditioner characterized by being controlled to operate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29656697A JP3511161B2 (en) | 1997-10-29 | 1997-10-29 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29656697A JP3511161B2 (en) | 1997-10-29 | 1997-10-29 | Air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11132603A JPH11132603A (en) | 1999-05-21 |
| JP3511161B2 true JP3511161B2 (en) | 2004-03-29 |
Family
ID=17835212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29656697A Expired - Fee Related JP3511161B2 (en) | 1997-10-29 | 1997-10-29 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3511161B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4285718B2 (en) * | 1999-12-28 | 2009-06-24 | 株式会社前川製作所 | Method and apparatus for utilizing exhaust heat of gas engine by steam ejector |
| KR101013373B1 (en) * | 2003-08-28 | 2011-02-14 | 삼성전자주식회사 | Air Conditioner |
| KR101329509B1 (en) * | 2008-08-04 | 2013-11-13 | 엘지전자 주식회사 | Hot water circulation system associated with heat pump and method for controlling the same |
| CN108954677B (en) * | 2018-07-23 | 2021-02-23 | 广东美的暖通设备有限公司 | Defrosting control method and system of multi-split air conditioning system and storage medium |
| CN113776162A (en) * | 2020-06-10 | 2021-12-10 | 青岛海信日立空调系统有限公司 | Air conditioner |
-
1997
- 1997-10-29 JP JP29656697A patent/JP3511161B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11132603A (en) | 1999-05-21 |
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