JP2757584B2 - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JP2757584B2 JP2757584B2 JP3135024A JP13502491A JP2757584B2 JP 2757584 B2 JP2757584 B2 JP 2757584B2 JP 3135024 A JP3135024 A JP 3135024A JP 13502491 A JP13502491 A JP 13502491A JP 2757584 B2 JP2757584 B2 JP 2757584B2
- Authority
- JP
- Japan
- Prior art keywords
- control device
- flow control
- connection pipe
- indoor
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
- F25B2313/0231—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
Landscapes
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、熱源機１台に対して
複数台の室内機を接続する多室型ヒートポンプ空気調和
装置に関するもので、特に各室内機毎に冷暖房を選択的
に、かつ一方の室内機では冷房、他方の室内機では暖房
が同時に行うことができる空気調和装置に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-room heat pump air conditioner for connecting a plurality of indoor units to one heat source unit.
To an apparatus, particularly selective heating and cooling for each indoor unit, and at one of the indoor unit is intended cooling, it relates to an air conditioner that can perform heating at the same time in the other indoor unit.
【０００２】[0002]
【従来の技術】以下、この発明の従来技術について説明
する。図８は特開平２−118372に示された従来の冷暖同
時運転可能な空気調和装置の冷媒系を中心とする全体構
成図である。また、図９乃至図１１は図８に示す空気調
和装置の冷暖房運転時の動作状態を示したもので、図９
は冷房又は暖房のみの運転動作状態図、図１０及び図１
１は冷暖房同時運転の動作を示すもので、図１０は暖房
主体（暖房運転容量が冷房運転容量より大きい場合）
を、図１１は冷房主体（冷房運転容量が暖房運転容量よ
り大きい場合）を示す運転動作状態図である。2. Description of the Related Art The prior art of the present invention will be described below. FIG. 8 is an overall configuration diagram mainly showing a refrigerant system of a conventional air conditioner capable of simultaneous cooling and heating operation described in Japanese Patent Application Laid-Open No. 2-118372. 9 to 11 show the air conditioner shown in FIG.
FIG. 9 shows the operation state of the air conditioner during the cooling / heating operation.
Is an operation state diagram of only cooling or heating, and FIGS. 10 and 1
1 shows the operation of the simultaneous cooling and heating operation, and FIG. 10 shows the main heating operation (when the heating operation capacity is larger than the cooling operation capacity).
FIG. 11 is an operation state diagram showing a cooling main body (when the cooling operation capacity is larger than the heating operation capacity).
【０００３】Ａは熱源機、Ｂ、Ｃ、Ｄは後述するように
互いに並列接続された室内機で、それぞれ同じ構成とな
っている。Ｅは後述するように、第１の分岐部、第２の
流量制御装置、第２の分岐部を内蔵した中継機。A is a heat source unit, and B, C and D are indoor units connected in parallel to each other as described later, and have the same configuration. E is a repeater incorporating a first branch, a second flow control device, and a second branch, as described later.
【０００４】１は圧縮機、２は熱源機の冷媒流通方向を
切換える四方切換弁、３は熱源機側熱交換器、４はアキ
ュムレータで、上記機器１〜３と接続され、熱源機Ａを
構成する。５は３台の室内側熱交換器、６は熱源機Ａの
四方弁２と中継機Ｅを接続する第１の接続配管、6b、6
c、6dはそれぞれ室内機Ｂ、Ｃ，Ｄの室内側熱交換器５
と中継機Ｅを接続し、第１の接続配管６に対応する室内
機側の第１の接続配管、７は熱源機Ａの熱源機側熱交換
器３と中継機Ｅを接続する第２の接続配管、7b、7c、7d
はそれぞれ室内機Ｂ、Ｃ、Ｄの室内側熱交換器５と中継
機Ｅを接続し第２の接続配管７に対応する室内機側の第
２の接続配管。 [0004] 1 is a compressor, 2 is a four-way switching valve for switching the refrigerant flow direction of the heat source unit, 3 is a heat exchanger on the heat source unit side, and 4 is an accumulator, which is connected to the above devices 1-3 to constitute a heat source unit A. I do. 5 is three indoor side heat exchangers, 6 is a first connection pipe connecting the four-way valve 2 of the heat source unit A and the relay unit E, 6b, 6
c and 6d are the indoor heat exchangers 5 of the indoor units B, C and D, respectively.
And the relay unit E, and a first connection pipe 7 on the indoor unit side corresponding to the first connection pipe 6, and a second connection pipe 7 connecting the heat source unit side heat exchanger 3 of the heat source unit A and the relay unit E. Connection piping, 7b, 7c, 7d
Is a second connection pipe on the indoor unit side corresponding to the second connection pipe 7 that connects the indoor heat exchanger 5 of each of the indoor units B, C, and D to the relay unit E, respectively .
【０００５】８は室内機側の第１の接続配管6b、6c、6d
と、第１の接続配管６または、第２の接続配管７側に切
り換え可能に接続する三方切換弁、９は室内側熱交換器
５に近接して接続され熱交換器５の出口側の冷房時はス
ーパーヒート量、暖房時はサブクール量により制御され
る第１の流量制御装置で、室内機側の第２の接続配管7
b、7c、7dに接続される。10は室内機側の第１の接続配
管6b、6c、6dと、第１の接続配管６または、第２の接続
配管７に切り換え可能に接続する三方切換弁８よりなる
第１の分岐部、11は室内機側の第２の接続配管7b、7c、
7dと第２の接続配管７よりなる第２の分岐部、13は第２
の接続配管７の第１の分岐部10と第２の分岐部11を接続
する開閉自在な第２の流量制御装置である。[0005] Reference numeral 8 denotes a first connection pipe 6b, 6c, 6d on the indoor unit side.
When the first connection pipe 6 or, three-way control valve for connection switching <br/> Ri changeover example possible to the second connection pipe 7 side, 9 heat exchanger is connected in proximity to the indoor heat exchanger 5 A first flow control device which is controlled by a superheat amount at the time of cooling at the outlet side of the unit 5 and a subcool amount at the time of heating, and has a second connection pipe 7 on the indoor unit side.
Connected to b, 7c, 7d. 10 The first connection pipe 6b of the indoor unit side, 6c, and 6d, a first connection pipe 6 or the first branch consisting of three-way valve 8 connected to enable For switching to the second connection pipe 7 , 11 are the second connection pipes 7b, 7c on the indoor unit side,
A second branch portion composed of 7d and a second connection pipe 7, 13 is a second branch portion.
This is a second flow control device that can be freely opened and closed and connects the first branch 10 and the second branch 11 of the connection pipe 7.
【０００６】このように構成されたこの発明の従来例に
ついて説明する。まず、図９を用いて冷房運転のみの場
合について説明する。すなわち、同図に実線矢印で示す
ように圧縮機１より吐出された高温高圧冷媒ガスは四方
切換弁２を通り、熱源機側熱交換器３で熱交換して凝縮
液化された後、第２の接続配管７、第２の流量制御装置
13の順に通り、更に第２の分岐部11、室内機側の第２の
接続配管7b、7c、7dを通り、各室内機Ｂ、Ｃ、Ｄに流入
する。そして、各室内機Ｂ、Ｃ、Ｄに流入した冷媒は、
第１の流量制御装置９により低圧まで減圧されて室内側
熱交換器５で、室内空気と熱交換して蒸発しガス化され
室内を冷房する。そして、このガス状態となった冷媒
は、室内機側の第１の接続配管6b、6c、6d、三方切換弁
８、第１の分岐部10、第１の接続配管６、熱源機の四方
弁２、アキュムレータ４を経て圧縮機１に吸入される循
環サイクルを構成し、冷房運転を行う。この時、三方切
換弁８の第１口8aは閉路、第２口8b及び第３口8cは開路
されている。A conventional example of the present invention having the above-described structure will be described. First, the case of only the cooling operation will be described with reference to FIG. That is, as shown by a solid line arrow in the drawing, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 passes through the four-way switching valve 2 and exchanges heat in the heat source device side heat exchanger 3 to be condensed and liquefied. Connection pipe 7, second flow control device
13 and then flow into the indoor units B, C and D through the second branch portion 11 and the second connection pipes 7b, 7c and 7d on the indoor unit side. The refrigerant flowing into each of the indoor units B, C, and D is
The first flow controller 9 is reduced to the low pressure in the indoor side heat exchanger 5, to cool the room is gasified and evaporated by exchanging heat with indoor air. The gaseous refrigerant is supplied to the first connection pipes 6b, 6c, 6d, the three-way switching valve 8, the first branch 10, the first connection pipe 6, and the four-way valve of the heat source unit on the indoor unit side. 2. A circulation cycle is drawn into the compressor 1 via the accumulator 4 to perform a cooling operation. At this time, the first port 8a of the three-way switching valve 8 is closed, and the second port 8b and the third port 8c are open.
【０００７】次に、図９を用いて暖房運転のみの場合に
ついて説明する。すなわち、同図に点線矢印で示すよう
に、圧縮機１より吐出された高温高圧冷媒ガスは、四方
切換弁２を通り、第１の接続配管６、第１の分岐部10、
三方切換弁８、室内機側の第１の接続配管6b、6c、6dの
順に通り、各室内機Ｂ、Ｃ、Ｄに流入し、室内空気と熱
交換して凝縮液化し、室内を暖房する。そして、この液
状態となった冷媒は、第１の流量制御装置９を通り、室
内機側の第２の接続配管7b、7c、7dから第２の分岐部11
に流入して合流し、更に第２の流量制御装置13を通り、
ここで、第１の流量制御装置９、又は第２の流量制御装
置13のどちらか一方で低圧の二相状態まで減圧される。
そして、低圧まで減圧された冷媒は、第２の接続配管７
を経て熱源機Ａの熱源機側熱交換器３に流入し、熱交換
して蒸発しガス状態となる。そしてこのガス状態となっ
た冷媒は、熱源機の四方弁２、アキュムレータ４を経て
圧縮機１に吸入される循環サイクルを構成し、暖房運転
をおこなう。この時、三方切換弁８は、上述した冷房運
転のみの場合と同様に開閉される。Next, the case of only the heating operation will be described with reference to FIG. That is, as shown by a dotted arrow in the figure, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 passes through the four-way switching valve 2, the first connection pipe 6, the first branch 10,
Three-way valve 8, the first connecting pipe 6b of the indoor unit side, 6c, 6 d <br/> as turn of the indoor unit B, flows C, and D, condensed and liquefied by exchanging heat with indoor air Heating the room. Then, the refrigerant in the liquid state passes through the first flow control device 9 and passes from the second connection pipes 7b, 7c, 7d on the indoor unit side to the second branch portion 11.
And merged, and further passed through the second flow control device 13,
Here , the pressure is reduced to a low-pressure two-phase state by either the first flow control device 9 or the second flow control device 13.
The refrigerant depressurized to a low pressure is supplied to the second connection pipe 7.
It flows into the heat source apparatus side heat exchanger 3 of the heat source unit A via, ing and evaporated gas state by heat exchange. The refrigerant this Tsu Do a gas state, the four-way valve 2 of the heat source machines, the accumulator 4 constitutes a circulation cycle is drawn into the compressor 1 through the performs heating operation. At this time, the three-way switching valve 8 is opened and closed as in the case of only the cooling operation described above.
【０００８】冷暖房同時運転における暖房主体の場合に
ついて図１０を用いて説明する。すなわち、同図に点線
矢印で示すように圧縮機１より吐出された高温高圧冷媒
ガスは、第１の接続配管６を通して中継機Ｅへ送られ、
そして第１の分岐部10、三方切換弁８、室内機側の第１
の接続配管6b、6cの順に通り、暖房しようとする各室内
機Ｂ、Ｃに流入し、室内側熱交換器５で室内空気と熱交
換して凝縮液化され室内を暖房する。そして、この凝縮
液化した冷媒は、ほぼ全開状態の第１の流量制御装置９
を通り少し減圧されて第２の分岐部11に流入する。そし
て、この冷媒の一部は、室内機側の第１の接続配管7dを
通り冷房しようとする室内機Ｄに入り、第１の流量制御
装置９に入り減圧された後に、室内側熱交換器５に入っ
て熱交換して蒸発しガス状態となって室内を冷房し、三
方切換弁８を介して第２の接続配管７に流入する。Referring to FIG. 10, a description will be given of a case in which heating is mainly performed in simultaneous operation of cooling and heating. That is, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 is sent to the repeater E through the first connection pipe 6 as shown by a dotted arrow in FIG.
Then, the first branch portion 10, the three-way switching valve 8, and the first
Flows into the indoor units B and C to be heated in the order of the connection pipes 6b and 6c, and exchanges heat with the indoor air in the indoor heat exchanger 5 to condense and liquefy and heat the room. The condensed and liquefied refrigerant is supplied to the first flow control device 9 which is almost fully opened.
Then, the pressure is slightly reduced and flows into the second branch portion 11. Then, a part of the refrigerant enters the indoor unit D to be cooled through the first connection pipe 7d on the indoor unit side, enters the first flow control device 9 and is depressurized, and then the indoor heat exchanger 5, heat exchange and evaporate to be in a gaseous state to cool the room, and flow into the second connection pipe 7 through the three-way switching valve 8.
【０００９】一方、他の冷媒は第２の分岐部11、第２の
流量制御装置13を通って第２の接続配管７に流入し、冷
房しようとする室内器Ｄを通った冷媒と合流して熱源機
Ａの熱源機側熱交換器３に流入し熱交換して蒸発しガス
状態となる。そして、その冷媒は、熱源機の四方弁２、
アキュムレータ４を経て圧縮機１に吸入される循環サイ
クルを構成し、暖房主体運転をおこなう。この時、室内
機Ｂ、Ｃに接続された三方切換弁８の第１口8aは閉路、
第２口8b、第３口8cは開路されており、室内機Ｄの第２
口8bは閉路、第１口8a、第３口8cは開路されている。On the other hand, the other refrigerant flows into the second connection pipe 7 through the second branch portion 11 and the second flow control device 13, and merges with the refrigerant having passed through the indoor unit D to be cooled. Then, it flows into the heat source unit side heat exchanger 3 of the heat source unit A, exchanges heat and evaporates to a gas state. And the refrigerant is the four-way valve 2 of the heat source unit,
A circulation cycle that is drawn into the compressor 1 through the accumulator 4 is configured to perform a heating main operation. At this time, the first port 8a of the three-way switching valve 8 connected to the indoor units B and C is closed,
The second port 8b and the third port 8c are open.
The port 8b is closed, and the first port 8a and the third port 8c are open.
【００１０】冷暖房同時運転における冷房主体の場合に
ついて図１１を用いて説明する。同図に実線矢印で示す
ように、圧縮機１より吐出された高温高圧冷媒ガスは、
熱源機側熱交換器３で任意量を熱交換して二相の高温高
圧状態となり、第２の接続配管７により中継機Ｅへ送ら
れる。そして、この冷媒の一部を第１の分岐部10、三方
切換弁８、室内機側の第１の接続配管6dの順に通り、暖
房しようとする室内機Ｄに流入し、室内側熱交換器５で
室内空気と熱交換して凝縮液化し、室内を暖房する。更
に、ほぼ全開状態の第１の流量制御装置９を通り、第２
の分岐部11に流入する。Referring to FIG. 11, a description will be given of a case where cooling is mainly performed in simultaneous cooling and heating operation. As shown by the solid arrows in the figure, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 is:
Any amount becomes high temperature and high pressure state of heat exchange biphasic heat source apparatus side heat exchanger 3, it is sent to a second connection in Ri by the pipe 7 splicing machine E. Then, a part of the refrigerant flows into the indoor unit D to be heated through the first branch portion 10, the three-way switching valve 8, and the first connection pipe 6d on the indoor unit side, and flows into the indoor side heat exchanger. At 5, heat exchange with indoor air is performed to condense and liquefy, and the room is heated. Further, it passes through the first flow control device 9 which is almost fully opened, and
Flows into the branching part 11.
【００１１】一方、残りの冷媒は第２の流量制御装置13
を通って第２の分岐部11に流入し、暖房しようとしてい
る室内機Ｄを通った冷媒と合流する。そして、第２の分
岐部11、室内機側の第２の接続配管7b、7cの順に通り、
各室内機Ｂ、Ｃに流入する。そして、各室内機Ｂ、Ｃに
流入した冷媒は、第１の流量制御装置９により低圧まで
減圧されて室内側熱交換器５に流入し、室内空気と熱交
換して蒸発しガス化され室内を冷房する。更に、このガ
ス状態となった冷媒は、室内機側の第１の接続配管6b、
6c、三方切換弁８、第１の分岐部10、第１の接続配管
６、熱源機の四方切換弁２、アキュムレータ４を経て圧
縮機１に吸入される循環サイクルを構成し、冷房主体運
転をおこなう。この時、室内機Ｂ、Ｃ、Ｄに接続された
三方切換弁８の第１口8a〜8cは暖房主体運転と同様に開
閉されている。On the other hand, the remaining refrigerant is supplied to the second flow control device 13.
Flows into the second branch portion 11 through the air passage and merges with the refrigerant that has passed through the indoor unit D to be heated. Then, in the order of the second branch portion 11 and the second connection pipes 7b and 7c on the indoor unit side,
It flows into each of the indoor units B and C. Then, the refrigerant flowing into each of the indoor units B and C is decompressed to a low pressure by the first flow control device 9 and flows into the indoor side heat exchanger 5, where it exchanges heat with the indoor air to evaporate and gasify, and Cool. Further, the refrigerant in the gas state is supplied to the first connection pipe 6b on the indoor unit side,
6c, a circulation cycle is drawn into the compressor 1 via the three-way switching valve 8, the first branch portion 10, the first connection pipe 6, the four-way switching valve 2 of the heat source unit, and the accumulator 4, and the cooling-main operation is performed. Do it. At this time, the first ports 8a to 8c of the three-way switching valve 8 connected to the indoor units B, C, and D are opened and closed as in the heating main operation.
【００１２】[0012]
【発明が解決しようとする課題】従来の２管式冷暖同時
運転可能な空気調和装置は以上のように構成されている
ため、四方切換弁の切換えによって第１及び第２の接続
配管と中継機内での冷媒の流れが逆転しており、四方切
換弁の切換え毎に運転状態が急変し、系の安定に時間を
要していた。また、暖房主体運転時第２の接続配管の圧
損が大きく、冷房室内機の能力が不足するという問題が
あった。[SUMMARY OF THE INVENTION] Since the conventional two-tube simultaneous heating and cooling operation an air conditioner capable of being configured as described above, the first and second connecting pipes and the relay aircraft by switching the four-way selector valve The flow of the refrigerant at this time was reversed, and the operating state changed suddenly each time the four-way switching valve was switched, and it took time for the system to stabilize. In addition, there is a problem that the pressure loss of the second connection pipe is large during the heating main operation, and the capacity of the cooling indoor unit is insufficient.
【００１３】この発明は、上記のような問題点を解決す
るためになされたもので、四方切換弁の切換えに対して
も第１及び第２の接続配管と中継機内での冷媒の流れを
一方向にし、系の安定性を高めた冷暖同時運転可能な空
気調和装置を得ることを目的とする。また、第２の接続
配管より太い第１の接続配管を常に低圧側で用いること
により、低圧圧損を低減し、冷房室内機の能力の低下を
抑制することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the flow of the refrigerant in the first and second connection pipes and the repeater is also reduced when the four-way switching valve is switched. It is an object of the present invention to obtain an air conditioner capable of simultaneous operation of cooling and heating with improved system stability. It is another object of the present invention to reduce the low pressure loss by always using the first connection pipe, which is thicker than the second connection pipe, on the low pressure side, and to suppress a decrease in the capacity of the cooling indoor unit.
【００１４】また、圧縮機運転中に、運転台数変化等に
より過渡的に高圧が上昇した場合に、中継機においてバ
イパス流路を広げることにより、運転停止することなく
運転を継続することを目的とするものである。Further, during compressor operation, when a transient high pressure rises by the operation number change, etc., by increasing the bypass flow passage in the repeater, and aims to continue the operation without stopping the operation Is what you do.
【００１５】[0015]
【課題を解決するための手段】この発明に係る空気調和
装置は、圧縮機、切換弁、熱源機側熱交換器等よりなる
１台の熱源機と、それぞれ室内側熱交換器を有する複数
台の室内機とを、第１、第２の接続配管を介して接続し
たものにおいて、上記複数台の室内機の上記室内側熱交
換器の一方を上記第１の接続配管または、第２の接続配
管に切り換え可能に接続してなる第１の分岐部と、上記
複数台の室内機の上記室内側熱交換器の他方に、上記第
１の流量制御装置を介して上記第２の接続配管に接続し
てなる第２の分岐部と、上記第２の接続配管に設けら
れ、上記第１の分岐部と、上記第２の分岐部とを連通さ
せる第２の流量制御装置と、一端が上記第２の分岐部に
接続され、他端がバイパス用流量制御装置を介して第１
の接続配管に接続されたバイパス回路と、上記第２の流
量制御装置の冷媒流入側圧力を検出する第１の圧力検出
手段と、上記第２の流量制御装置の冷媒流出側圧力を検
出する第２の圧力検出手段と、上記第１、第２の接続配
管間に設けられ、流れる冷媒の方向を切換えることによ
り、運転時は常に、上記熱源機と上記室内機間に介在す
る第１の接続配管を低圧に、第２の接続配管を高圧にす
る流路切換弁装置と、圧縮機運転中に、高圧が上昇した
場合に、上記第１、第２の圧力検出手段の検出値を入力
とし、上記第２の流量制御装置にかかる差圧に応じて、
上記第２の流量制御装置または上記バイパス用流量制御
装置の開度を選択的に増加させる開度決定手段を設けた
ものである。SUMMARY OF THE INVENTION An air conditioner according to the present invention comprises a single heat source unit including a compressor, a switching valve, a heat source side heat exchanger, etc., and a plurality of indoor units each having an indoor side heat exchanger. And one of the indoor-side heat exchangers of the plurality of indoor units is connected to the first connection pipe or the second connection pipe. A first branch portion switchably connected to a pipe and the other of the indoor heat exchangers of the plurality of indoor units to the second connection pipe via the first flow control device. A second flow control device that is provided in the second connection pipe and is connected to the second connection pipe and connects the first branch and the second branch to each other; The other end is connected to the second branch, and the other end is connected to the first branch through the bypass flow control device.
A first pressure detecting means for detecting the refrigerant inflow side pressure of the second flow rate control device, and a bypass circuit for detecting the refrigerant outflow side pressure of the second flow rate control device. The first connection between the heat source unit and the indoor unit is always provided during operation by switching the direction of the flowing refrigerant provided between the pressure detection unit and the first and second connection pipes. A flow path switching valve device for setting the pressure of the pipe to low pressure and setting the pressure of the second connection pipe to high pressure; and when the high pressure increases during the operation of the compressor, the detection values of the first and second pressure detection means are input. , According to the differential pressure applied to the second flow control device,
An opening determining means for selectively increasing the opening of the second flow control device or the bypass flow control device is provided.
【００１６】[0016]
【作用】この発明においては、圧縮機運転中に、高圧が
上昇した場合に、第２の流量制御装置にかかる差圧に応
じて第２の流量制御装置、またはバイパス用流量制御装
置の開度を選択的に増加することにより、第２の流量制
御装置にかかる差圧をほぼ目標値に保ちながら、第２の
接続配管から第２の流量制御装置、およびバイパス用流
量制御装置を介して第１の接続配管へ抜けるバイパス流
路を広げ流路圧損を低減し、冷媒を流れ易くすることに
より、高圧を低下させる。According to the present invention, when the high pressure rises during the operation of the compressor, the opening of the second flow control device or the bypass flow control device according to the differential pressure applied to the second flow control device. Is selectively increased, the pressure difference applied to the second flow control device is kept substantially at the target value, and the second pressure is controlled from the second connection pipe via the second flow control device and the bypass flow control device. The high pressure is reduced by widening the bypass flow path leading to the first connection pipe, reducing the flow path pressure loss, and making the refrigerant easier to flow.
【００１７】実施例１． 以下、この発明の実施例について説明する。図１はこの
発明の一実施例による空気調和装置の冷媒系を中心とす
る全体構成図である。又、図２乃至図４は図１に示す空
気調和装置における冷暖房運転時の動作状態を示したも
ので、図２は冷房または暖房のみの運転状態図、図３及
び図４は冷暖房同時運転の動作を示すもので、図３は暖
房主体運転（暖房運転容量が冷房運転容量より大きい場
合）を、図４は冷房主体運転（冷房運転容量が暖房運転
容量より大きい場合）を示す運転動作状態図である。な
お、この実施例では熱源機１台に室内機３台を接続した
場合について説明するが、２台以上の室内機を接続した
場合はすべて同様である。Embodiment 1 FIG. Hereinafter, embodiments of the present invention will be described. FIG. 1 is an overall configuration diagram mainly showing a refrigerant system of an air conditioner according to an embodiment of the present invention. FIGS. 2 to 4 show the operation states of the air-conditioning apparatus shown in FIG. 1 during the cooling / heating operation. FIG. 2 is an operation state diagram of only the cooling or heating operation, and FIGS. FIG. 3 shows the operation, and FIG. 3 shows an operation state diagram showing a heating main operation (when the heating operation capacity is larger than the cooling operation capacity) and FIG. 4 shows a cooling main operation (when the cooling operation capacity is larger than the heating operation capacity). It is. In this embodiment, a case where three indoor units are connected to one heat source unit will be described, but the same applies to a case where two or more indoor units are connected.
【００１８】図１において、Ａは熱源機、Ｂ、Ｃ、Ｄは
後述するように互いに並列接続された室内機でそれぞれ
同じ構成となっている。Ｅは後述するように、第１の分
岐部10、第２の流量制御装置13、第２の分岐部11、気液
分離装置12、熱交換部16ａ、16ｂ，16ｃ，16ｄ、19、お
よびともにバイパス用流量制御装置である第３、第４の
流量制御装置15、17を内蔵した中継機である。In FIG. 1, A is a heat source unit, and B, C and D are indoor units connected in parallel to each other as described later, and have the same configuration. E represents a first branch 10, a second flow controller 13, a second branch 11, a gas-liquid separator 12, a heat exchanger 16a, 16b, 16c, 16d, 19, and both, as described later. It is a repeater incorporating third and fourth flow control devices 15 and 17 which are bypass flow control devices.
【００１９】また、１は圧縮機、２は熱源機の冷媒流通
方向を切り換える切換弁であり、この実施例では、四方
切換弁を使用している。３は熱源機側熱交換器、４はア
キュムレータで、上記四方切換弁２を介して圧縮機１と
接続されている。これらによって熱源機Ａが構成され
る。Reference numeral 1 denotes a compressor, and reference numeral 2 denotes a switching valve for switching the refrigerant flow direction of the heat source unit. In this embodiment, a four-way switching valve is used. Reference numeral 3 denotes a heat source unit side heat exchanger, and 4 denotes an accumulator, which is connected to the compressor 1 via the four-way switching valve 2. These constitute the heat source device A.
【００２０】また、５は３台の室内機Ｂ、Ｃ、Ｄに設け
られた室内側熱交換器、６は熱源機Ａの四方切換弁２と
中継機Ｅを後述する第４の逆止弁33を介して接続する太
い第１の接続配管、6b、6c、6dはそれぞれ室内機Ｂ、
Ｃ、Ｄの室内側熱交換器５と中継機Ｅを接続し、第１の
接続配管６に対応する室内機側の第１の接続配管、７は
熱源機Ａの熱源機側熱交換器３と中継機Ｅを後述する第
３の逆止弁32を介して接続する上記第１の接続配管より
細い第２の接続配管である。Reference numeral 5 denotes an indoor heat exchanger provided in the three indoor units B, C, and D. Reference numeral 6 denotes a four-way switching valve 2 of the heat source unit A and a fourth check valve to be described later. The first thick connection pipes 6b, 6c and 6d connected via 33 are indoor units B and
C and D indoor-side heat exchangers 5 are connected to the repeater E, and a first connection pipe on the indoor unit side corresponding to the first connection pipe 6 is a heat source unit-side heat exchanger 3 of the heat source unit A. And a second connection pipe which is thinner than the first connection pipe and connects the relay E with a third check valve 32 to be described later.
【００２１】また、7b、7c、7dはそれぞれ室内機Ｂ、
Ｃ、Ｄの室内側熱交換機５と中継機Ｅを第１の流量制御
装置９を介して接続し、第２の接続配管７に対応する室
内機側の第２の接続配管である。８は室内機側の第１の
接続配管6b、6c、6dを、第１の接続配管６または第２の
接続配管７側に切り換え可能に接続する三方切換弁であ
る。９は室内側熱交換器５に近接して接続され、冷房時
は室内側熱交換器５の出口側のスーパーヒート量、暖房
時はサブクール量により制御される第１の流量制御装置
で、室内機側の第２の接続配管7b、7c、7dに接続され
る。7b, 7c and 7d are indoor units B and
A second connection pipe on the indoor unit side corresponding to the second connection pipe 7, wherein the indoor heat exchangers 5 of C and D and the repeater E are connected via the first flow control device 9. Reference numeral 8 denotes a three-way switching valve for switchably connecting the first connection pipes 6b, 6c, 6d on the indoor unit side to the first connection pipe 6 or the second connection pipe 7 side. Reference numeral 9 denotes a first flow control device which is connected in proximity to the indoor heat exchanger 5 and is controlled by the amount of superheat at the outlet side of the indoor heat exchanger 5 during cooling and by the subcool amount during heating. It is connected to the second connection pipes 7b, 7c, 7d on the machine side.
【００２２】10は室内機側の第１の接続配管6b、6c、6d
を、第１の接続配管６または、第２の接続配管７に切換
え可能に接続する三方切換弁８よりなる第１の分岐部で
ある。11は室内機側の第２の接続配管7b、7c、7dと、第
２の接続配管７よりなる第２の分岐部である。12は第２
の接続配管７の途中に設けられた気液分離装置で、その
気相部は三方切換弁８の第１口8aに接続され、その液相
部は第２の分岐部11に接続されている。13は気液分離装
置12と第２の分岐部11との間に接続する開閉自在な第２
の流量制御装置（ここでは電気式膨張弁）である。10 is a first connection pipe 6b, 6c, 6d on the indoor unit side.
Is a first branch portion composed of a three-way switching valve 8 that is switchably connected to the first connection pipe 6 or the second connection pipe 7. Reference numeral 11 denotes a second branch portion including the second connection pipes 7b, 7c, and 7d on the indoor unit side and the second connection pipe 7. 12 is the second
A gas-liquid separation device is provided in the middle of the connection pipe 7 of the above, the gas-phase part is connected to the first port 8a of the three-way switching valve 8, and the liquid-phase part is connected to the second branch part 11. . 13 is a second openable and closable second device connected between the gas-liquid separation device 12 and the second branch portion 11.
(Here, an electric expansion valve).
【００２３】14は第２の分岐部11と上記第１の接続配管
６とを結ぶ第１のバイパス回路であるバイパス配管、15
はバイパス配管14の途中に設けられた、第１のバイパス
用流量制御装置である第３の流量制御装置（ここでは電
気式膨張弁）、16ａはバイパス配管14の途中に設けられ
た上記第３の流量制御装置15の下流に設けられ、第２の
分岐部11における各室内機側の第２の接続配管7b、7c、
7dの会合部との間でそれぞれ熱交換を行う第２の熱交換
部である。16ｂ、16ｃ、16ｄはそれぞれバイパス配管14
の途中に設けられた第３の流量制御装置15の下流に設け
られ、第２の分岐部11における各室内機側の第２の接続
配管7b、7c、7dとの間でそれぞれ熱交換を行う第３の熱
交換部である。Reference numeral 14 denotes a bypass pipe, which is a first bypass circuit connecting the second branch portion 11 and the first connection pipe 6, and 15
It is provided in the middle of the bypass pipe 14, the first bypass
The third flow rate controller is a use flow rate control device (where the electrical expansion valve), 16a is provided downstream of the third flow controller 15 provided in the middle of the bypass pipe 14, the second branch The second connection pipes 7b, 7c on the indoor unit side in the part 11
This is a second heat exchange section that performs heat exchange with the meeting section 7d. 16b, 16c and 16d are bypass pipes 14 respectively.
Is provided downstream of the third flow control device 15 provided in the middle of the process, and performs heat exchange with the second connection pipes 7b, 7c, 7d on the indoor unit side in the second branch portion 11, respectively. This is the third heat exchange section.
【００２４】19は、バイパス配管14の上記第３の流量制
御装置15の下流および第２の熱交換部16ａの下流に設け
られ、気液分離装置12と第２の流量制御装置13とを接続
する配管との間で熱交換を行う第１の熱交換部、17は、
第２のバイパス用流量制御装置としての第４の流量制御
装置（ここでは電気式膨張弁）で、上記第１のバイパス
回路とともに、一端が第２の分岐部11に接続され、他端
が第１の接続配管６に接続されるバイパス回路を形成す
る第２のバイパス回路である。[0024] 19 is provided downstream of the downstream and the second heat exchanging portion 16a of the third flow controller 15 of the bypass pipe 14, connects the gas-liquid separator 12 and the second flow control device 13 first heat exchange section for exchanging heat between the piping, 17,
In the fourth flow control device as a second bypass flow control device (here the electric expansion valve), the first bypass
One end is connected to the second branch portion 11 together with the circuit ,
To form a bypass circuit but connected to the first connection pipe 6
A second bypass circuit .
【００２５】一方、32は上記熱源機側熱交換器３と上記
接続配管７との間に設けられた第３の逆止弁であり、上
記熱源機側熱交換器３から上記第２の接続配管７へのみ
冷媒流通を許容する。33は上記熱源機Ａの四方切換弁２
と上記第１の接続配管６との間に設けられた第４の逆止
弁であり、上記第１の接続配管６から上記四方切換弁２
へのみ冷媒流通を許容する。34は上記熱源機Ａの四方切
換弁２と上記第２の接続配管７との間に設けられた第５
の逆止弁であり、上記四方切換弁２から上記第２の接続
配管７へのみ冷媒流通を許容する。35は上記熱源機側熱
交換器３と上記第１の接続配管６との間に設けられた第
６の逆止弁であり、上記第１の接続配管６から上記熱源
機側熱交換器３へのみ冷媒流通を許容する。40は上記第
３、第４、第５、第６の逆止弁32、33、34、35で構成さ
れた流路切換弁装置であり、流れる冷媒の方向を切換え
ることにより運転時には常に上記第１の接続配管を低圧
に、上記第２の接続配管を高圧に保持するものである。On the other hand, reference numeral 32 denotes a third check valve provided between the heat source unit side heat exchanger 3 and the connection pipe 7, and a third check valve 32 is provided between the heat source unit side heat exchanger 3 and the second connection line. Only the flow of the refrigerant to the pipe 7 is allowed. 33 is a four-way switching valve 2 of the heat source unit A.
And a fourth check valve provided between the first connection pipe 6 and the first connection pipe 6.
Only the refrigerant flow is allowed. Reference numeral 34 denotes a fifth valve provided between the four-way switching valve 2 of the heat source unit A and the second connection pipe 7.
And allows the refrigerant to flow only from the four-way switching valve 2 to the second connection pipe 7. Reference numeral 35 denotes a sixth check valve provided between the heat source unit-side heat exchanger 3 and the first connection pipe 6, and a sixth check valve 35 from the first connection pipe 6 to the heat source unit-side heat exchanger 3. Only the refrigerant flow is allowed. Reference numeral 40 denotes a flow path switching valve device composed of the third, fourth, fifth, and sixth check valves 32, 33, 34, and 35. The first connection pipe is maintained at a low pressure, and the second connection pipe is maintained at a high pressure.
【００２６】25は上記第１の分岐部10と第２の流量制御
装置13との間に設けられた第１の圧力検出手段、26は上
記第２の流量制御装置13と第４の流量制御装置17との間
に設けられた第２の圧力検出手段、27は上記第１の接続
配管６部に設けられた第３の圧力検出手段である。ま
た、50は上記四方切換弁２と上記アキュムレータ４とを
接続する配管途中に設けられた低圧飽和温度検出手段、
18は上記圧縮機１と上記四方切換弁２とを接続する配管
途中に設けられた第４の圧力検出手段である。Reference numeral 25 denotes a first pressure detecting means provided between the first branch section 10 and the second flow control device 13, and reference numeral 26 denotes a second flow control device 13 and a fourth flow control device. A second pressure detecting means 27 provided between the apparatus and the device 17 is a third pressure detecting means provided in the first connection pipe 6. 50 is a low-pressure saturation temperature detecting means provided in the piping connecting the four-way switching valve 2 and the accumulator 4;
Reference numeral 18 denotes fourth pressure detecting means provided in the middle of a pipe connecting the compressor 1 and the four-way switching valve 2.
【００２７】次に動作について説明する。まず、図２を
用いて冷房運転のみの場合について説明する。同図に実
線矢印で示すように低圧飽和温度検出手段50の検出温度
が所定値になるように容量制御される圧縮機１より吐出
された高温高圧冷媒ガスは四方切換弁２を通り、熱源機
側熱交換器３で空気と熱交換して凝縮された後、第３の
逆止弁32、第２の接続配管７、気液分離装置12、第２の
流量制御装置13の順に通り、更に第２の分岐部11、室内
機側の第２の接続配管7b、7c、7dを通り、各室内機Ｂ、
Ｃ、Ｄに流入する。各室内機Ｂ、Ｃ、Ｄに流入した冷媒
は、各室内側熱交換器５の出口のスーパーヒート量によ
り制御される第１の流量制御装置９により低圧まで減圧
されて室内側熱交換器５で室内空気と熱交換して蒸発し
ガス化され室内を冷房する。Next, the operation will be described. First, the case of only the cooling operation will be described with reference to FIG. As shown by a solid line arrow in the figure, the high-temperature high-pressure refrigerant gas discharged from the compressor 1 whose capacity is controlled so that the temperature detected by the low-pressure saturation temperature detecting means 50 becomes a predetermined value passes through the four-way switching valve 2 and passes through the heat source unit. After being condensed by exchanging heat with air in the side heat exchanger 3, the third check valve 32, the second connection pipe 7, the gas-liquid separator 12, and the second flow controller 13 are further passed in this order. The second branch portion 11 passes through the second connection pipes 7b, 7c, and 7d on the indoor unit side, and each indoor unit B,
Flow into C and D. The refrigerant flowing into each of the indoor units B, C, and D is decompressed to a low pressure by the first flow control device 9 controlled by the superheat amount at the outlet of each of the indoor heat exchangers 5, and the indoor heat exchanger 5 The heat exchanges with the indoor air to evaporate and gasify and cool the room.
【００２８】このガス状態となった冷媒は、室内機側の
第１の接続配管6b、6c、6d、三方切換弁８、第１の分岐
部10、第１の接続配管６、第４の逆止弁33、熱源機Ａの
四方切換弁２、アキュムレータ４を経て圧縮機１に吸入
される循環サイクルを構成し、冷房運転を行う。この
時、三方切換弁８の第１口8aは閉路、第２口8bと第３口
8cは開路されている。また、冷媒はこの時、第１の接続
配管６が低圧、第２の接続配管７が高圧のため必然的に
第３の逆止弁32、第４の逆止弁33へ流通する。The refrigerant in the gaseous state is supplied to the first connection pipes 6b, 6c, 6d on the indoor unit side, the three-way switching valve 8, the first branch portion 10, the first connection pipe 6, and the fourth reverse pipe. A circulation cycle is drawn into the compressor 1 through the stop valve 33, the four-way switching valve 2 of the heat source unit A, and the accumulator 4, and performs a cooling operation. At this time, the first port 8a of the three-way switching valve 8 is closed, and the second port 8b and the third port 8b are closed.
8c is open. At this time, the refrigerant naturally flows to the third check valve 32 and the fourth check valve 33 because the first connection pipe 6 has a low pressure and the second connection pipe 7 has a high pressure.
【００２９】また、このサイクルの時、第２の流量制御
装置13を通過した冷媒の一部がバイパス配管14へ入り上
記第３の流量制御装置15で低圧まで減圧されて第３の熱
交換部16ｂ、16ｃ、16ｄで第２の分岐部11の各室内機側
の第２の接続配管7b、7c、7dとの間で、また第２の熱交
換部16ａで第２の分岐部11の各室内機側の第２の接続配
管7b、7c、7dの会合部との間で、更に第１の熱交換部19
で第２の流量制御装置13に流入する冷媒との間で、熱交
換を行い蒸発した冷媒は、第１の接続配管６、第４の逆
止弁33へ入り、熱源機Ａの四方切換弁２、アキュムレー
タ４を経て圧縮機１に吸入される。At the time of this cycle, a part of the refrigerant that has passed through the second flow control device 13 enters the bypass pipe 14 and is reduced to a low pressure by the third flow control device 15 so that the third heat exchange section At 16b, 16c, 16d, between the second connection pipes 7b, 7c, 7d on the indoor unit side of the second branch section 11 and at each of the second branch sections 11 at the second heat exchange section 16a. A first heat exchange section 19 is further provided between the second connection pipes 7b, 7c, and 7d on the indoor unit side and the associated section.
The refrigerant that has undergone heat exchange with the refrigerant flowing into the second flow control device 13 at the above step evaporates and enters the first connection pipe 6 and the fourth check valve 33, and the four-way switching valve of the heat source device A 2. It is sucked into the compressor 1 via the accumulator 4.
【００３０】一方、第１、第２、第３の熱交換部19、16
a 、16b 、16c 、16d で熱交換し冷却され、サブクール
を充分につけられた上記第２の分岐部11の冷媒は冷房し
ようとしている室内機Ｂ、Ｃ、Ｄへ流入する。On the other hand, the first, second and third heat exchange sections 19 and 16
The refrigerant in the second branch portion 11, which is cooled by exchanging heat in a, 16b, 16c, and 16d and is sufficiently subcooled, flows into the indoor units B, C, and D to be cooled.
【００３１】次に、図２を用いて暖房運転のみの場合に
ついて説明する。すなわち、同図に点線矢印で示すよう
に、第４の圧力検出手段14の検出圧力が所定値になるよ
うに容量制御される圧縮機１より吐出された高温高圧冷
媒ガスは、四方切換弁２を通り、第５の逆止弁34、第２
の接続配管７、気液分離装置12を通り、第１の分岐部1
0、三方切換弁８、室内機側の第１の接続配管6b、6c、6
dの順に通り、各室内機Ｂ、Ｃ、Ｄに流入し、室内空気
と熱交換して凝縮液化し、室内を暖房する。Next, the case of only the heating operation will be described with reference to FIG. That is, as shown by a dotted arrow in the figure, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 whose capacity is controlled so that the pressure detected by the fourth pressure detecting means 14 becomes a predetermined value is supplied to the four-way switching valve 2. Through the fifth check valve 34, the second
Through the connection pipe 7 and the gas-liquid separation device 12 to the first branch 1
0, three-way switching valve 8, first connection piping 6b, 6c, 6 on indoor unit side
The air flows into each of the indoor units B, C, and D in the order of d, exchanges heat with indoor air to be condensed and liquefied, and heats the indoor.
【００３２】この液状態となった冷媒は、各室内側熱交
換器５の出口のサブクール量により制御されてほぼ全開
状態の第１の流量制御装置９を通り、室内機側の第２の
接続配管7b、7c、7dから第２の分岐部11に流入して合流
し、更に第４の流量制御装置17を通る。ここで、低圧ま
で減圧された冷媒は、第１の接続配管６を経て熱源機Ａ
の第６の逆止弁35、熱源機側熱交換器３に流入し、空気
と熱交換して蒸発しガス状態となり、熱源機Ａの四方切
換弁２、アキュムレータ４を経て圧縮機１に吸入される
循環サイクルを構成し、暖房運転を行う。この時、三方
切換弁８は第２口8bは閉路、第１口8aと第３口8cは開路
されている。また、冷媒は、この時、第１の接続配管６
が低圧、第２の接続配管７が高圧のため必然的に第５の
逆止弁34、第６の逆止弁35へ流通する。The refrigerant in the liquid state is controlled by the subcooling amount at the outlet of each indoor side heat exchanger 5, passes through the first flow control device 9 which is almost fully opened, and the second connection on the indoor unit side. The pipes flow into the second branch portion 11 from the pipes 7b, 7c, and 7d, join together, and further pass through the fourth flow control device 17. Here, the refrigerant decompressed to a low pressure passes through the first connection pipe 6 to the heat source device A.
Flows into the heat exchanger 3 on the heat source unit side, exchanges heat with air, evaporates to a gaseous state, and is sucked into the compressor 1 via the four-way switching valve 2 and the accumulator 4 of the heat source unit A. And a heating operation. At this time, the three-way switching valve 8 has the second port 8b closed, and the first port 8a and the third port 8c open. At this time, the refrigerant is supplied to the first connection pipe 6
Is low pressure, and the second connection pipe 7 flows through the fifth check valve 34 and the sixth check valve 35 inevitably due to the high pressure.
【００３３】次に冷暖同時運転における暖房主体の場合
について図３を用いて説明する。同図に点線矢印で示す
ように第４の圧力検出手段14の検出圧力が所定値になる
ように容量制御される圧縮機１より吐出された高温高圧
冷媒ガスは、四方切換弁２を経て第５の逆止弁34、第２
の接続配管７を通して中継機Ｅへ送られ、気液分離装置
12を通り、第１の分岐部10、三方切換弁８、室内機側の
第１の接続配管6b、6cの順に通り、暖房しようとしてい
る各室内機Ｂ、Ｃに流入し、室内側熱交換器５で室内空
気と熱交換して凝縮液化され、室内を暖房する。この凝
縮液化した冷媒は、各室内側熱交換器５の出口のサブク
ール量により制御されほぼ全開状態の第１の流量制御装
置９を通り、少し減圧されて第２の分岐部11に流入す
る。Next, a description will be given of a case of mainly heating in the simultaneous cooling and heating operation with reference to FIG. As shown by the dotted arrow in the figure, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 whose capacity is controlled so that the detected pressure of the fourth pressure detecting means 14 becomes a predetermined value passes through the four-way switching valve 2. 5th check valve 34, 2nd
Is sent to the repeater E through the connection pipe 7 of
12, the first branch 10, the three-way switching valve 8, and the first connection pipes 6 b and 6 c on the indoor unit side, flow into the indoor units B and C to be heated, and perform indoor heat exchange. The heat is exchanged with the room air in the vessel 5 to condense and liquefy, and the room is heated. The condensed and liquefied refrigerant is controlled by the subcooling amount at the outlet of each indoor heat exchanger 5, passes through the first flow control device 9 which is almost fully opened, and flows into the second branch portion 11 after being slightly reduced in pressure.
【００３４】この冷媒の一部は、室内機側の第２の接続
配管7dを通り、冷房しようとする室内機Ｄに入り、室内
側熱交換器５の出口スーパーヒート量により制御される
第１の流量制御装置９に入り、減圧された後に、室内側
熱交換器５に入って熱交換して蒸発しガス状態となって
室内を冷房し、第１の接続配管6dを経て三方切換弁８を
介して第１の接続配管６に流入する。一方、他の冷媒は
第１の圧力検出手段25の検出圧力、第２の圧力検出手段
26の検出圧力の圧力差が所定範囲となるように制御され
る上記第４の流量制御装置17を通って、冷房しようとす
る室内機Ｄを通った冷媒と合流して太い第１の接続配管
６を経て、熱源機Ａの第６の逆止弁35、熱源機側熱交換
器３に流入し、空気と熱交換して蒸発しガス状態とな
る。A part of this refrigerant passes through the second connection pipe 7d on the indoor unit side, enters the indoor unit D to be cooled, and is controlled by the superheat amount at the outlet of the indoor heat exchanger 5. After being decompressed, it enters the indoor heat exchanger 5 and exchanges heat to evaporate to a gaseous state to cool the room, and the three-way switching valve 8 via the first connection pipe 6d. Flows into the first connection pipe 6 through the. On the other hand, other refrigerants are detected by the first pressure detecting means 25 and the second pressure detecting means.
Through the fourth flow control device 17, which is controlled so that the pressure difference between the detected pressures of 26 is within a predetermined range, the refrigerant flows through the indoor unit D to be cooled and merges with the refrigerant. After passing through 6, the gas flows into the sixth check valve 35 of the heat source device A and the heat source device side heat exchanger 3, and exchanges heat with air to evaporate to a gas state.
【００３５】この冷媒は、熱源機Ａの四方切換弁２、ア
キュムレータ４を経て圧縮機１に吸入される循環サイク
ルを構成し、暖房主体運転を行う。この時、冷房する室
内機Ｄの室内側熱交換器５の蒸発圧力と熱源機側熱交換
器３の圧力差が、太い第１の接続配管６に切り換えるた
めに小さくなる。また、この時、室内機Ｂ、Ｃに接続さ
れた三方切換弁８の第２口8bは閉路、第１口8aと第３口
8cは開路されており、室内機Ｄの第１口8aは閉路、第２
口8bと第３口8cは開路されている。また、冷媒はこの
時、第１の接続配管６が低圧、第２の接続配管７が高圧
のため必然的に第５の逆止弁34、第６の逆止弁35へ流通
する。This refrigerant forms a circulation cycle which is drawn into the compressor 1 through the four-way switching valve 2 and the accumulator 4 of the heat source unit A, and performs a heating-main operation. At this time, the difference between the evaporation pressure of the indoor side heat exchanger 5 of the indoor unit D to be cooled and the pressure of the heat source unit side heat exchanger 3 is reduced due to the switching to the thick first connection pipe 6. At this time, the second port 8b of the three-way switching valve 8 connected to the indoor units B and C is closed, and the first port 8a is connected to the third port 8a.
8c is open, the first port 8a of the indoor unit D is closed,
The mouth 8b and the third mouth 8c are open. At this time, the refrigerant naturally flows to the fifth check valve 34 and the sixth check valve 35 because the first connection pipe 6 has a low pressure and the second connection pipe 7 has a high pressure.
【００３６】このサイクル時、一部の液冷媒は第２の分
岐部11の各室内機側の第２の接続配管7b、7c、7dの会合
部からバイパス配管14へ入り、上記第３の流量制御装置
15で低圧まで減圧されて、第３の熱交換部16ｂ、16ｃ、
16ｄで第２の分岐部11の各室内機側の第２の接続配管7
b、7c、7dとの間で、また第２の熱交換部16ａで第２の
分岐部11の各室内機側の第２の接続配管7b、7c、7dの会
合部との間で、更に第１の熱交換部19で第２の流量制御
装置13に流入する冷媒との間で熱交換を行い、蒸発した
冷媒は、第１の接続配管６、第６の逆止弁35を経由し、
熱源機側熱交換器３へ入り、空気と熱交換して蒸発気化
した後、熱源機Ａの四方切換弁２、アキュムレータ４を
経て圧縮機１に吸入される。一方第１、第２、第３の熱
交換部19、16ａ、16ｂ、16ｃ、16ｄで熱交換し、冷却さ
れ、サブクールを充分につけられた上記第２の分岐部11
の冷媒は冷房しようとしている室内機Ｄへ流入する。During this cycle, a part of the liquid refrigerant enters the bypass pipe 14 from the junction of the second connection pipes 7b, 7c, 7d on the indoor unit side of the second branch section 11, and the third flow rate Control device
The pressure is reduced to a low pressure at 15, and the third heat exchange sections 16b, 16c,
16d, the second connection pipe 7 on each indoor unit side of the second branch portion 11
b, 7c, 7d, and between the second heat exchange section 16a and the junction of the second connection pipes 7b, 7c, 7d on the indoor unit side of the second branch section 11, and The first heat exchange section 19 exchanges heat with the refrigerant flowing into the second flow control device 13, and the evaporated refrigerant passes through the first connection pipe 6 and the sixth check valve 35. ,
After entering the heat source device side heat exchanger 3 and exchanging heat with air to evaporate and evaporate, it is sucked into the compressor 1 via the four-way switching valve 2 and the accumulator 4 of the heat source device A. On the other hand, the first, second, and third heat exchangers 19, 16a, 16b, 16c, and 16d exchange heat, are cooled, and are sufficiently cooled and provided with the sub-cooler.
Flows into the indoor unit D to be cooled.
【００３７】次に、冷暖房同時運転における冷房主体の
場合について図４を用いて説明する。同図に実線矢印で
示すように、低圧飽和温度検出手段50の検出温度が所定
値になるように容量制御される圧縮機１より吐出された
高温高圧冷媒ガスは、四方切換弁２を経て熱源機側熱交
換器３に流入し、空気と熱交換して気液二相の高温高圧
状態となる。その後、この二相の高温高圧状態の冷媒は
第３の逆止弁32、第２の接続配管７を経て、中継機Ｅの
気液分離装置12へ送られる。Next, will be described with reference to FIG. 4 for the case of cooling-main at the simultaneous cooling and heating operation. As shown by the solid line arrow in FIG. 3, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 whose capacity is controlled so that the temperature detected by the low-pressure saturation temperature detecting means 50 becomes a predetermined value passes through a four-way switching valve 2 and a heat source. It flows into the machine side heat exchanger 3 and exchanges heat with air to be in a gas-liquid two-phase high-temperature and high-pressure state. Thereafter, the two-phase high-temperature and high-pressure refrigerant is sent to the gas-liquid separator 12 of the repeater E via the third check valve 32 and the second connection pipe 7.
【００３８】ここで、ガス状冷媒と液状冷媒に分離さ
れ、分離されたガス状冷媒は第１の分岐部10、三方切換
弁８、室内機側の第１の接続配管6dの順に通り、暖房し
ようとする室内機Ｄに流入し、室内側熱交換器５で室内
空気と熱交換して凝縮液化し、室内を暖房する。更に、
室内側熱交換器５の出口のサブクール量により制御さ
れ、ほぼ全開状態の第１の流量制御装置９を通り、少し
減圧されて、第２の分岐部11に流入する。Here, the gaseous refrigerant is separated into a gaseous refrigerant and a liquid refrigerant, and the separated gaseous refrigerant passes through the first branch portion 10, the three-way switching valve 8, the first connection pipe 6d on the indoor unit side in the order of heating. The refrigerant flows into the indoor unit D to be heated, and exchanges heat with the indoor air in the indoor heat exchanger 5 to condense and liquefy, thereby heating the room. Furthermore,
It is controlled by the subcooling amount at the outlet of the indoor heat exchanger 5, passes through the first flow control device 9 which is almost fully opened, and is slightly reduced in pressure, and flows into the second branch portion 11.
【００３９】一方、残りの液状冷媒は第１の圧力検出手
段25の検出圧力、第２の圧力検出手段26の検出圧力によ
って制御される第２の流量制御装置13を通って、第２の
分岐部11に流入し、暖房しようとする室内機Ｄを通った
冷媒と合流する。そして合流した冷媒は、第２の分岐部
11、室内機側の第２の接続配管7b、7cの順に通り、各室
内機Ｂ、Ｃに流入する。各室内機Ｂ、Ｃに流入した冷媒
は、室内機側熱交換器５の出口のスーパーヒート量によ
り制御される第１の流量制御装置９により低圧まで減圧
された後に、室内機側熱交換器５に流入し、室内空気と
熱交換して蒸発しガス化され、室内を冷房する。On the other hand, the remaining liquid refrigerant passes through the second flow control device 13 controlled by the pressure detected by the first pressure detecting means 25 and the pressure detected by the second pressure detecting means 26, and passes through the second branch. The refrigerant flows into the unit 11 and merges with the refrigerant that has passed through the indoor unit D to be heated. Then, the combined refrigerant flows into the second branch portion.
11. The air flows into the indoor units B and C in the order of the second connection pipes 7b and 7c on the indoor unit side. The refrigerant flowing into each of the indoor units B and C is decompressed to a low pressure by the first flow control device 9 controlled by the superheat amount at the outlet of the indoor unit-side heat exchanger 5, and then the indoor unit-side heat exchanger 5 and exchanges heat with room air to evaporate and gasify, thereby cooling the room.
【００４０】更に、このガス状態となった冷媒は、室内
機側の第１の接続配管6b、6c、三方切換弁８、第１の分
岐部10を通り、第１の接続配管６、第４の逆止弁33、熱
源機Ａの四方切換弁２、アキュムレータ４を経て圧縮機
１に吸入される循環サイクルを構成し、冷房主体運転を
行う。また、この時、室内機Ｂ、Ｃに接続された三方切
換弁８の第１口8aは閉路、第２口8bと第３口8cは開路さ
れており、室内機Ｄの第２口8bは閉路、第１口8aと第３
口8cは開路されている。冷媒はこの時、第１の接続配管
６が低圧、第２の接続配管７が高圧のため、必然的に第
３の逆止弁32、第４の逆止弁33へ流通する。Further, the refrigerant in the gaseous state passes through the first connection pipes 6b and 6c on the indoor unit side, the three-way switching valve 8, the first branch portion 10, and the first connection pipe 6 and the fourth connection pipe 4. , A circulation cycle is drawn into the compressor 1 through the check valve 33, the four-way switching valve 2 of the heat source unit A, and the accumulator 4, and the cooling main operation is performed. At this time, the first port 8a of the three-way switching valve 8 connected to the indoor units B and C is closed, the second port 8b and the third port 8c are open, and the second port 8b of the indoor unit D is closed. Closed, first port 8a and third
The mouth 8c is open. At this time, the refrigerant naturally flows to the third check valve 32 and the fourth check valve 33 because the first connection pipe 6 has a low pressure and the second connection pipe 7 has a high pressure.
【００４１】このサイクルの時、一部の液冷媒は第２の
分岐部11の各室内機側の第２の接続配管7b、7c、7dの会
合部からバイパス配管14へ入り、上記第３の流量制御装
置15で低圧まで減圧されて、第３の熱交換部16ｂ、16
ｃ、16ｄで第２の分岐部11の各室内機側の第２の接続配
管7b、7c、7dとの間で、また第２の熱交換器部16ａで第
２の分岐部11の各室内機側の第２の接続配管7b、7c、7d
の会合部との間で、更に第１の熱交換部19で第２の流量
制御装置13に流入する冷媒との間で熱交換を行い、蒸発
した冷媒は第１の接続配管６から第４の逆止弁33へ入
り、熱源機Ａの四方切換弁２、アキュムレータ４を経て
圧縮機１に吸入される。一方、第１、第２、第３の熱交
換部19、16ａ、16ｂ、16ｃ、16ｄで熱交換し冷却されサ
ブクールを充分につけられた上記第２の分岐部11の冷媒
は冷房しようとしている室内機Ｂ、Ｃへ流入する。At the time of this cycle, a part of the liquid refrigerant enters the bypass pipe 14 from the junction of the second connection pipes 7b, 7c, 7d on the indoor unit side of the second branch section 11, and enters the third pipe. The pressure is reduced to a low pressure by the flow control device 15, and the third heat exchange units 16b, 16
c and 16d between the second connection pipes 7b, 7c and 7d on the indoor unit side of the second branch section 11 and the second heat exchanger section 16a and each room of the second branch section 11 Machine side second connection pipes 7b, 7c, 7d
Heat exchange with the refrigerant flowing into the second flow control device 13 in the first heat exchange unit 19, and the evaporated refrigerant flows from the first connection pipe 6 to the fourth connection pipe 6. And is sucked into the compressor 1 through the four-way switching valve 2 and the accumulator 4 of the heat source unit A. On the other hand, the refrigerant in the second branch portion 11, which has been cooled and subcooled sufficiently by exchanging heat in the first, second, and third heat exchange portions 19, 16a, 16b, 16c, and 16d, is to be cooled in the room to be cooled. Machines B and C flow.
【００４２】次に、圧縮機運転中の、過渡的な高圧上昇
抑制制御について、図５乃至図６で説明する。図５は実
施例１による高圧上昇抑制制御のブロック図、図６は上
記実施例１による高圧上昇抑制のフローチャートであ
る。図５において、61は第２の流量制御装置14及び第３
の流量制御装置15の開度制御を同期的に行うために、前
回制御を行ってからの時間を計時する第１の計時手段で
あり、圧縮機１の運転開始または第２の流量制御装置14
及び第３の流量制御装置15の開度制御を行う毎にクリア
される。62は第１の圧力検出手段25、第２の圧力検出手
段26、第３の圧力検出手段27の検出圧力および上記第１
の計時手段の信号から第２の流量制御装置14及び第３の
流量制御装置15の開度を決定する開度決定手段である。
64は前回高圧上昇抑制制御を行ってからの時間を計時す
る第２の計時手段であり、圧縮機１の運転開始または高
圧上昇抑制制御によりクリアされる。Next, transient high-pressure rise suppression control during compressor operation will be described with reference to FIGS. FIG. 5 is a block diagram of the high-pressure rise suppression control according to the first embodiment, and FIG. 6 is a flowchart of the high-pressure rise suppression according to the first embodiment. In FIG. 5, reference numeral 61 denotes the second flow control device 14 and the third flow control device 14.
In order to synchronously control the opening degree of the flow rate control device 15, the first time measurement means for measuring the time since the previous control was performed.
And is cleared each time the opening degree control of the third flow control device 15 is performed. 62 indicates the detected pressures of the first pressure detecting means 25, the second pressure detecting means 26, the third pressure detecting means 27 and the first
The opening degree determining means determines the opening degree of the second flow rate control device 14 and the third flow rate control device 15 from the signal of the time measuring means.
Numeral 64 denotes second time counting means for counting the time since the previous high pressure rise suppression control was performed, and is cleared by the start of the operation of the compressor 1 or the high pressure rise suppression control.
【００４３】次に、図６により高圧上昇抑制制御の流れ
を説明する。ステップ71では第１の圧力検出手段25の検
出圧力が所定値以上かを判定する。所定値以上の場合は
ステップ78へ進み、所定値以下の場合はステップ72へ進
む。ステップ78では第２の計時手段64が所定時間Ｂ以上
計時しているかを判定する。計時していないときは、ス
テップ72へ進み、計時しているときは、ステップ79へ進
む。ステップ79では第２の計時手段64のデータをクリア
し、ステップ74へ進む。ステップ74では第１の圧力検出
手段25と第２の圧力検出手段26の差圧が所定差圧値Ｃ以
上かを判定する。所定差圧以上の場合はステップ75へ進
み、そうでない場合はステップ76へ進む。Next, the flow of the high-pressure rise suppression control will be described with reference to FIG. In step 71, it is determined whether the pressure detected by the first pressure detecting means 25 is equal to or higher than a predetermined value. If it is equal to or greater than the predetermined value, the process proceeds to step 78, and if it is equal to or less than the predetermined value, the process proceeds to step 72. In step 78, it is determined whether or not the second time counting means 64 has timed a predetermined time B or more. If not, the process proceeds to step 72. If the time is measured, the process proceeds to step 79. In step 79, the data of the second time measuring means 64 is cleared, and the flow advances to step 74. In step 74, it is determined whether the differential pressure between the first pressure detecting means 25 and the second pressure detecting means 26 is equal to or higher than a predetermined differential pressure value C. If the pressure difference is equal to or greater than the predetermined pressure difference, the process proceeds to step 75; otherwise, the process proceeds to step 76.
【００４４】ステップ75では第２の流量制御装置13の開
度を所定値ａだけ増加し、ステップ76では流量制御装置
15の開度を所定値ｂだけ増加する。そしてそれぞれステ
ップ77へ進む。ステップ72では第１の計時手段61が所定
時間Ａ以上計時しているかを判定する。計時している場
合はステップ73へ進み、まだ計時していない場合はステ
ップ71へ戻る。ステップ73では第２の流量制御装置13及
び第３の流量制御装置15の開度を定時制御する(定時制
御の詳細な説明はここでは省略)そして、ステップ77へ
進む。ステップ77では第１の計時手段61の計時データを
クリアし、ステップ71に戻る。In step 75, the opening of the second flow control device 13 is increased by a predetermined value a.
The opening of No. 15 is increased by a predetermined value b. Then, the process proceeds to step 77. In step 72, it is determined whether or not the first time counting means 61 has timed a predetermined time A or more. If it is timed, the process proceeds to step 73, and if it is not yet timed, the process returns to step 71. In step 73, the openings of the second flow control device 13 and the third flow control device 15 are controlled on a regular basis (detailed description of the regular control is omitted here), and the process proceeds to step 77. In step 77, the timekeeping data of the first timekeeping means 61 is cleared, and the process returns to step 71.
【００４５】以上の説明では、第２の流量制御装置13に
かかる差圧に応じて、第２の流量制御装置13、または第
１のバイパス用流量制御装置である第３の流量制御装置
15の開度を選択的に増加させたが、第３の流量制御装置
15の代りに第２のバイパス用流量制御装置である第４の
流量制御装置17の開度を増加させるようにしてもよい。 In the above description, the second flow control device 13
Depending on the differential pressure, the second flow control device 13 or the second
A third flow control device, which is the first flow control device for bypass.
Although the opening of 15 was selectively increased, the third flow control device
A fourth bypass flow control device instead of the 15
The opening of the flow control device 17 may be increased.
【００４６】実施例２。 なお、上記実施例１では三方切換弁８を設けて室内機側
の第１の接続配管6b、6c、6dを、第１の接続配管６また
は、第２の接続配管７に切り換え可能に接続している
が、図７に示すように２つの電磁弁30、31等の開停弁を
設けて上述したように切り換え可能に接続しても同様の
効果を奏す。Embodiment 2 FIG. In the first embodiment, the three-way switching valve 8 is provided to switchably connect the first connection pipes 6b, 6c, 6d on the indoor unit side to the first connection pipe 6 or the second connection pipe 7. However, the same effect can be obtained by providing two solenoid valves 30, 31 and the like as shown in FIG. 7 and connecting them in a switchable manner as described above.
【００４７】[0047]
【発明の効果】以上説明した通り、この発明に係る空気
調和装置は、圧縮機、切換弁、熱源機側熱交換器等より
なる１台の熱源機と、それぞれ室内側熱交換器を有する
複数台の室内機とを、第１、第２の接続配管を介して接
続したものにおいて、上記複数台の室内機の上記室内側
熱交換器の一方を上記第１の接続配管または、第２の接
続配管に切り換え可能に接続してなる第１の分岐部と、
上記複数台の室内機の上記室内側熱交換器の他方に、上
記第１の流量制御装置を介して接続され、かつ上記第２
の接続配管に接続してなる第２の分岐部と、上記第２の
接続配管に設けられ、上記第１の分岐部と上記第２の分
岐部とを連通させる第２の流量制御装置と、一端が上記
第２の分岐部に接続され、他端がバイパス用流量制御装
置を介して上記第１の接続配管に接続されたバイパス回
路と、上記第２の流量制御装置の冷媒流入側圧力を検出
する第１の圧力検出手段と、上記第２の流量制御装置の
冷媒流出側圧力を検出する第２の圧力検出手段と、上記
第１、第２の接続配管間に設けられ、流れる冷媒の方向
を切換えることにより運転時は常に、上記熱源機と上記
室内機間に介在する第１の接続配管を低圧に、第２の接
続配管を高圧にする流路切換弁装置と、圧縮機運転中
に、高圧が上昇した場合に、上記第１、第２の圧力検出
手段の検出値を入力とし、第２の流量制御装置にかかる
差圧に応じて、差圧が大きい場合には第２の流量制御装
置、差圧が小さい場合にはバイパス用流量制御装置の開
度を増加することにより、第２の流量制御装置にかかる
差圧をほぼ目標値に保ちながら、第２の接続配管から第
２の流量制御装置およびバイパス用流量制御装置を介し
て第１の接続配管へ抜けるバイパス流路を広げ流路圧損
を低減し、冷媒を流れ易くすることにより、高圧を低下
させ、運転停止することなしに運転を継続することがで
きる。As described above, the air conditioner according to the present invention has a single heat source unit including a compressor, a switching valve, a heat source unit side heat exchanger, etc., and a plurality of indoor units each having an indoor side heat exchanger. And one of the indoor heat exchangers of the plurality of indoor units is connected to the first connection pipe or the second connection pipe. A first branch portion switchably connected to the connection pipe;
The other of the indoor heat exchangers of the plurality of indoor units is connected to the other one of the indoor heat exchangers via the first flow control device, and
A second branch portion connected to the second connection pipe, and a second flow control device provided in the second connection pipe and communicating the first branch section and the second branch section; A bypass circuit having one end connected to the second branch and the other end connected to the first connection pipe via a bypass flow control device, and a refrigerant inflow side pressure of the second flow control device. A first pressure detecting means for detecting, a second pressure detecting means for detecting a refrigerant outflow side pressure of the second flow rate control device, and a refrigerant pressure sensor provided between the first and second connection pipes, A flow switching valve device that always switches the direction by switching the direction so that the first connection pipe interposed between the heat source unit and the indoor unit has a low pressure and the second connection pipe has a high pressure. When the high pressure rises, the detection values of the first and second pressure detecting means are input. Then, according to the differential pressure applied to the second flow control device, by increasing the opening degree of the second flow control device when the differential pressure is large and by increasing the opening degree of the bypass flow control device when the differential pressure is small. A bypass flow passage from the second connection pipe to the first connection pipe via the second flow control apparatus and the bypass flow control apparatus while maintaining the differential pressure applied to the second flow control apparatus at a substantially target value. By reducing the pressure loss in the flow path and facilitating the flow of the refrigerant, the pressure can be reduced and the operation can be continued without stopping the operation.
【図１】この発明の実施例１による空気調和装置の冷媒
系を中心とする全体構成図である。FIG. 1 is a refrigerant of an air conditioner according to Embodiment 1 of the present invention.
It is the whole block diagram focusing on a system .
【図２】この発明の実施例１による空気調和装置の冷
房、または暖房のみの運転状態を説明するための冷媒回
路図である。[2] cooling of the air conditioning apparatus according to Embodiment 1 of the present invention, or a refrigerant circuit diagram for explaining an operating state of the heating only.
【図３】この発明の実施例１による空気調和装置の暖房
主体の運転状態を説明するための冷媒回路図である。FIG. 3 is a refrigerant circuit diagram for explaining an operating state mainly of heating of the air-conditioning apparatus according to Embodiment 1 of the present invention.
【図４】この発明の実施例１による空気調和装置の、冷
房主体の運転状態を説明するための冷媒回路図である。FIG. 4 is a refrigerant circuit diagram for explaining an operation state mainly for cooling of the air-conditioning apparatus according to Embodiment 1 of the present invention.
【図５】この発明の実施例１による空気調和装置の、高
圧上昇抑制制御のブロック図である。FIG. 5 is a block diagram of high-pressure rise suppression control of the air-conditioning apparatus according to Embodiment 1 of the present invention.
【図６】この発明の実施例１による空気調和装置の、高
圧上昇抑制制御のフローチャートである。FIG. 6 is a flowchart of high-pressure rise suppression control of the air-conditioning apparatus according to Embodiment 1 of the present invention.
【図７】この発明の実施例２による空気調和装置の冷媒
系を中心とする全体構成図である。FIG. 7 is an overall configuration diagram centering on a refrigerant system of an air conditioner according to Embodiment 2 of the present invention.
【図８】従来の空気調和装置の冷媒系を中心とする全体
構成図である。FIG. 8 is an overall configuration diagram mainly showing a refrigerant system of a conventional air conditioner.
【図９】図８に示す空気調和装置の冷房または暖房のみ
の運転状態を説明するための冷媒回路図である。9 is a refrigerant circuit diagram for explaining an operation state of only cooling or heating of the air-conditioning apparatus shown in FIG.
【図１０】図８に示す空気調和装置の暖房主体の運転状
態を説明するための冷媒回路図である。FIG. 10 is a refrigerant circuit diagram for explaining an operation state mainly of heating of the air-conditioning apparatus shown in FIG.
【図１１】図８に示す空気調和装置の冷房主体の運転状
態を説明するための冷媒回路図である。FIG. 11 is a refrigerant circuit diagram for describing an operation state of the air-conditioning apparatus shown in FIG. 8 mainly for cooling.
１ 圧縮機、２ 切換弁、３ 熱源機側熱交換器、４
アキュムレータ、５室内側熱交換器、６ 第１の接続配
管、７ 第２の接続配管、９ 第１の流量制御装置、１
０ 第１の分岐部、１１ 第２の分岐部、１２ 気液分
離装置、１３第２の流量制御装置、１４ バイパス配
管、１５ 第３の流量制御装置（第１のバイパス用流量
制御装置）、１６ａ，１６ｂ，１６ｃ，１６ｄ，１９
熱交換部、１７ 第４の流量制御装置（第２のバイパス
用流量制御装置）、１８ 第４の圧力検出手段、２５
第１の圧力検出手段、２６ 第２の圧力検出手段、４０
流路切換弁装置、５０ 低圧飽和温度検出手段、６２
第２、第３の流量制御装置の開度決定手段、Ａ 熱源
機、Ｂ，Ｃ，Ｄ 室内機、Ｅ 中継機。1 compressor, 2 switching valve, 3 heat exchanger side heat exchanger, 4
Accumulator, 5 indoor heat exchanger, 6 first connection pipe, 7 second connection pipe, 9 first flow control device, 1
0 first branch, 11 second branch, 12 gas-liquid separator, 13 second flow controller, 14 bypass pipe, 15 third flow controller (first bypass flow controller ) , 16a, 16b, 16c, 16d, 19
Heat exchange unit, 17 fourth flow control device (second bypass flow control device ) , 18 fourth pressure detection means, 25
First pressure detecting means, 26 second pressure detecting means, 40
Flow path switching valve device, 50 low pressure saturation temperature detecting means, 62
The opening determination means of the second and third flow control devices, A heat source unit, B, C, D indoor unit, and E relay unit.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 林田 徳明 和歌山市手平６丁目５番66号 三菱電機 株式会社 和歌山製作所内 (72)発明者 河西 智彦 和歌山市手平６丁目５番66号 三菱電機 株式会社 和歌山製作所内 (72)発明者 亀山 純一 和歌山市手平６丁目５番66号 三菱電機 株式会社 和歌山製作所内 (58)調査した分野(Int.Cl.6，ＤＢ名) F25B 29/00 361 F25B 13/00 104──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tokuaki Hayashida 6-66, Tehira, Wakayama-shi Mitsubishi Electric Corporation Wakayama Works (72) Inventor Tomohiko Kasai 6-66, Tehira, Wakayama-shi Mitsubishi Electric In Wakayama Works, Ltd. (72) Inventor Junichi Kameyama 6-66, Tehira, Wakayama City Mitsubishi Electric Wakayama Works, Ltd. (58) Fields investigated (Int. Cl. 6 , DB name) F25B 29/00 361 F25B 13/00 104
Claims (3)
りなる１台の熱源機と、それぞれ室内側熱交換器を有す
る複数台の室内機とを、第１、第２の接続配管を介して
接続したものにおいて、上記複数台の室内機の室内側熱
交換器の一方を上記第１の接続配管、または気液分離装
置を介して第２の接続配管に切り換え可能に接続する第
１の分岐部と、上記複数台の室内機の室内側熱交換器の
他方を第１の流量制御装置を介して上記第２の接続配管
に接続してなる第２の分岐部と、上記第２の接続配管に
設けられ、上記気液分離装置と上記第２の分岐部とを連
通させる第２の流量制御装置と、一端が上記第２の分岐
部に接続され、他端がバイパス用流量制御装置を介して
上記第１の接続配管に接続されたバイパス回路と、上記
第２の流量制御装置の冷媒流入側圧力を検出する第１の
圧力検出手段と、上記第２の流量制御装置の冷媒流出側
圧力を検出する第２の圧力検出手段と、上記第１及び第
２の接続配管間に設けられ、流れる冷媒の方向を切換え
ることにより、運転時は常に、上記熱源機と上記室内機
間に介在する第１の接続配管を低圧に、第２の接続配管
を高圧にする流路切換弁装置と、圧縮機運転中に、高圧
が上昇した場合に、上記第１、第２の圧力検出手段の検
出値を入力とし、上記第２の流量制御装置にかかる差圧
に応じて、上記第２の流量制御装置、または上記バイパ
ス用流量制御装置の開度を選択的に増加させる開度決定
手段を設けたことを特徴とする空気調和装置。1. A first and a second connection between one heat source unit including a compressor, a switching valve, a heat source unit side heat exchanger and the like and a plurality of indoor units each having an indoor side heat exchanger. One of the indoor-side heat exchangers of the plurality of indoor units is connected to the first connection pipe or a gas-liquid separation device.
A first branch portion that is switchably connected to a second connection pipe via a second unit, and the other one of the indoor heat exchangers of the plurality of indoor units is connected to the second branch via a first flow control device. a second branch portion formed by connecting the connection pipe, and the provided second connection pipe, the second flow control device for providing communication between the gas-liquid separator and the upper Symbol second branch portions, one end Is connected to the second branch, the other end is connected to the first connection pipe via the bypass flow control device, and a refrigerant inflow side pressure of the second flow control device is detected. A first pressure detecting means, a second pressure detecting means for detecting a refrigerant outflow side pressure of the second flow control device, and a direction of the flowing refrigerant provided between the first and second connection pipes. , The first operation interposed between the heat source unit and the indoor unit is always performed during operation. A flow path switching valve device for setting the connection pipe to a low pressure and setting the second connection pipe to a high pressure; and inputting the detection values of the first and second pressure detection means when the high pressure increases during the operation of the compressor. And an opening determining means for selectively increasing an opening of the second flow control device or the bypass flow control device according to a differential pressure applied to the second flow control device. An air conditioner characterized by:
の分岐部における各室内機側の第２の接続配管及びそれ
らの会合部、並びに第２の流量制御装置の冷媒流入側の
第２の接続配管との間でそれぞれ熱交換を行う熱交換部
を有する第１のバイパス回路の途中に設けられた第３の
流量制御装置である請求項１記載の空気調和装置。 2. A flow control device for bypass, comprising :
Connection pipe on the side of each indoor unit at the branch portion of
And the second flow control device on the refrigerant inflow side
A heat exchange unit that exchanges heat with the second connection pipe.
A third bypass circuit provided in the middle of the first bypass circuit having
The air conditioner according to claim 1, which is a flow control device.
の分岐部に、他端が第１の接続配管に直接接続される第
４の流量制御装置である請求項１記載の空気調和装置。 3. The bypass flow control device according to claim 1 , wherein one end of the bypass flow control device is a second flow control device.
The other end is directly connected to the first connection pipe.
The air conditioner according to claim 1, wherein the air conditioner is the flow control device of (4).
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3135024A JP2757584B2 (en) | 1991-06-06 | 1991-06-06 | Air conditioner |
| AU16034/92A AU649810B2 (en) | 1991-05-09 | 1992-05-05 | Air conditioning apparatus |
| DE69212225T DE69212225D1 (en) | 1991-05-09 | 1992-05-08 | air conditioner |
| EP95106908A EP0676595B1 (en) | 1991-05-09 | 1992-05-08 | Air conditioning apparatus |
| EP92304136A EP0514086B1 (en) | 1991-05-09 | 1992-05-08 | Air conditioning apparatus |
| ES92304136T ES2092035T3 (en) | 1991-05-09 | 1992-05-08 | AIR CONDITIONER. |
| US07/880,719 US5297392A (en) | 1991-05-09 | 1992-05-08 | Air conditioning apparatus |
| ES95106908T ES2120104T3 (en) | 1991-05-09 | 1992-05-08 | AIR CONDITIONER. |
| DE69226381T DE69226381T2 (en) | 1991-05-09 | 1992-05-08 | air conditioning |
| AU59368/94A AU660124B2 (en) | 1991-05-09 | 1994-04-05 | Air conditioning apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3135024A JP2757584B2 (en) | 1991-06-06 | 1991-06-06 | Air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04359768A JPH04359768A (en) | 1992-12-14 |
| JP2757584B2 true JP2757584B2 (en) | 1998-05-25 |
Family
ID=15142155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3135024A Expired - Lifetime JP2757584B2 (en) | 1991-05-09 | 1991-06-06 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2757584B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9677790B2 (en) | 2012-05-14 | 2017-06-13 | Mitsubishi Electric Corporation | Multi-room air-conditioning apparatus |
| WO2020261387A1 (en) * | 2019-06-25 | 2020-12-30 | 三菱電機株式会社 | Air conditioner |
| US11994306B2 (en) | 2019-07-10 | 2024-05-28 | Mitsubishi Electric Corporation | Outdoor unit and air-conditioning apparatus |
-
1991
- 1991-06-06 JP JP3135024A patent/JP2757584B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9677790B2 (en) | 2012-05-14 | 2017-06-13 | Mitsubishi Electric Corporation | Multi-room air-conditioning apparatus |
| WO2020261387A1 (en) * | 2019-06-25 | 2020-12-30 | 三菱電機株式会社 | Air conditioner |
| GB2597414A (en) * | 2019-06-25 | 2022-01-26 | Mitsubishi Electric Corp | Air-conditioning apparatus |
| GB2597414B (en) * | 2019-06-25 | 2023-02-22 | Mitsubishi Electric Corp | Air-Conditioning Apparatus |
| US11994306B2 (en) | 2019-07-10 | 2024-05-28 | Mitsubishi Electric Corporation | Outdoor unit and air-conditioning apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04359768A (en) | 1992-12-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2944507B2 (en) | Air conditioner | |
| JP2757584B2 (en) | Air conditioner | |
| JP2616523B2 (en) | Air conditioner | |
| JP2598550B2 (en) | Air conditioner | |
| JP3138491B2 (en) | Air conditioner | |
| JP2616525B2 (en) | Air conditioner | |
| JP2765970B2 (en) | Air conditioner | |
| JP2727733B2 (en) | Air conditioner | |
| JP2718286B2 (en) | Air conditioner | |
| JPH04359767A (en) | Air conditioner | |
| JP2718308B2 (en) | Air conditioner | |
| JP2601052B2 (en) | Air conditioner | |
| JP3092212B2 (en) | Air conditioner | |
| JP3092214B2 (en) | Air conditioner | |
| JP2616524B2 (en) | Air conditioner | |
| JPH05322348A (en) | Air conditioner | |
| JPH0765825B2 (en) | Air conditioner | |
| JP2718287B2 (en) | Air conditioner | |
| JPH0752044B2 (en) | Air conditioner | |
| JPH05172430A (en) | Air conditioning apparatus | |
| JP2800472B2 (en) | Air conditioner | |
| JPH04110573A (en) | Air conditioner | |
| JPH0752045B2 (en) | Air conditioner | |
| JPH04353369A (en) | Air conditioner | |
| JPH04327768A (en) | Air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080313 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090313 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100313 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100313 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110313 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110313 Year of fee payment: 13 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120313 Year of fee payment: 14 |