JP6773680B2 - Refrigeration cycle equipment - Google Patents

Refrigeration cycle equipment Download PDF

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JP6773680B2
JP6773680B2 JP2017551510A JP2017551510A JP6773680B2 JP 6773680 B2 JP6773680 B2 JP 6773680B2 JP 2017551510 A JP2017551510 A JP 2017551510A JP 2017551510 A JP2017551510 A JP 2017551510A JP 6773680 B2 JP6773680 B2 JP 6773680B2
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valve
refrigerant
indoor heat
hexagonal
heat exchangers
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JPWO2017085888A1 (en
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拓未 西山
拓未 西山
航祐 田中
航祐 田中
拓也 松田
拓也 松田
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Mitsubishi Electric Corp
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    • 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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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
    • F25B2313/005—Outdoor unit expansion valves
    • 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
    • F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
    • 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
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/0276—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using six-way valves

Description

本発明は、冷凍サイクル装置に関し、特に複数の室内熱交換器を備える冷凍サイクル装置に関する。 The present invention relates to a refrigeration cycle device, and more particularly to a refrigeration cycle device including a plurality of indoor heat exchangers.

従来、六方弁および膨張弁を備え、室外機または室内機について冷暖房時のいずれにおいても温度対向流化できるヒートポンプ空調装置は存在する（特開平８−１７０８６４号公報、特開平８−１７０８６５号公報参照）。 Conventionally, there is a heat pump air conditioner that has a hexagonal valve and an expansion valve and can countercurrent the temperature of an outdoor unit or an indoor unit at both times of heating and cooling (see JP-A-8-170864 and JP-A-8-1708865). ).

特開平８−１７０８６４号公報Japanese Unexamined Patent Publication No. 8-170864 特開平８−１７０８６５号公報Japanese Unexamined Patent Publication No. 8-1708865

しかしながら、従来のヒートポンプ空調装置は、個別に運転動作・停止動作を切り替え可能に設けられている複数の室内機を備える冷凍サイクル装置に適用された場合、一部の室内機が運転し他の室内機が停止している状態に置かれたときに、停止している室内機に冷媒が滞留してしまうという問題があった。 However, when the conventional heat pump air conditioner is applied to a refrigeration cycle device having a plurality of indoor units that can be individually switched between operation and stop operations, some indoor units operate and other indoor units are operated. There was a problem that the refrigerant stayed in the stopped indoor unit when the machine was placed in the stopped state.

本発明は、上記のような課題を解決するためになされたものである。本発明の主たる目的は、個別に運転動作・停止動作を切り替え可能に設けられている複数の室内機を備える冷凍サイクル装置であって、一部の室内機が運転し他の室内機が停止している状態に置かれたときにも、停止している室内機に冷媒が滞留することが抑制された冷凍サイクル装置を提供することにある。 The present invention has been made to solve the above problems. A main object of the present invention is a refrigerating cycle device including a plurality of indoor units provided so that the operation operation and the stop operation can be individually switched, and some indoor units are operated and other indoor units are stopped. It is an object of the present invention to provide a refrigerating cycle apparatus in which the refrigerant is suppressed from staying in a stopped indoor unit even when it is placed in the state of being

本発明に係る冷凍サイクル装置は、冷媒と室内の空気との熱交換を行う複数の室内熱交換器と、冷媒と室外の空気との熱交換を行う室外熱交換器と、冷媒の流路を切り替える六方弁と、冷媒を圧縮するための圧縮機と、冷媒の流れを遮断可能に設けられている閉止弁とを備える。複数の室内熱交換器は室外熱交換器と六方弁を介して接続されている。複数の室内熱交換器は六方弁に対し互いに並列に接続されている。複数の室内熱交換器の少なくとも１つは六方弁と閉止弁を介して接続されている。 The refrigeration cycle apparatus according to the present invention comprises a plurality of indoor heat exchangers that exchange heat between the refrigerant and the indoor air, an outdoor heat exchanger that exchanges heat between the refrigerant and the outdoor air, and a flow path of the refrigerant. It includes a six-way valve for switching, a compressor for compressing the refrigerant, and a shutoff valve provided so as to shut off the flow of the refrigerant. A plurality of indoor heat exchangers are connected to the outdoor heat exchanger via a hexagonal valve. Multiple indoor heat exchangers are connected in parallel to each other with respect to the hexagonal valve. At least one of the plurality of indoor heat exchangers is connected via a hexagonal valve and a shutoff valve.

本発明によれば、複数の室内機が個別に運転動作・停止動作を切り替え可能に設けられている場合において一部の室内機が運転し他の室内機が停止している状態に置かれたときにも、停止している室内機に冷媒が滞留することが抑制された冷凍サイクル装置を提供することができる。 According to the present invention, when a plurality of indoor units are individually provided so that the operation operation and the stop operation can be switched, some indoor units are operated and other indoor units are stopped. Occasionally, it is possible to provide a refrigeration cycle device in which the refrigerant is suppressed from staying in the stopped indoor unit.

実施の形態１に係る冷凍サイクル装置を示す図である。It is a figure which shows the refrigeration cycle apparatus which concerns on Embodiment 1. FIG. 実施の形態１に係る冷凍サイクル装置の、冷房運転時における六方弁を示す断面図である。It is sectional drawing which shows the hexagonal valve at the time of a cooling operation of the refrigerating cycle apparatus which concerns on Embodiment 1. FIG. 実施の形態１に係る冷凍サイクル装置の、暖房運転時における六方弁を示す断面図である。It is sectional drawing which shows the hexagonal valve at the time of a heating operation of the refrigerating cycle apparatus which concerns on Embodiment 1. FIG. 実施の形態１に係る冷凍サイクル装置の六方弁の変形例を示す図である。It is a figure which shows the modification of the hexagonal valve of the refrigerating cycle apparatus which concerns on Embodiment 1. FIG. 図４に示す六方弁の冷房運転時および暖房運転時の各状態を示す図である。It is a figure which shows each state at the time of the cooling operation and the heating operation of the hexagonal valve shown in FIG. 実施の形態２に係る冷凍サイクル装置を示す図である。It is a figure which shows the refrigeration cycle apparatus which concerns on Embodiment 2.

以下、図面を参照して、本発明に係る実施の形態について説明する。なお、以下の図面において、同一または相当する部分には同一の参照番号を付し、その説明は繰り返さない。 Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are given the same reference numbers, and the description thereof will not be repeated.

（実施の形態１）
＜冷凍サイクル装置の構成＞
次に、図１を参照して、実施の形態１に係る冷凍サイクル装置１００を説明する。冷凍サイクル装置１００は、複数の室内熱交換器１（１ａ，１ｂ）、室外熱交換器２、六方弁３、閉止弁４（４ａ，４ｂ）、延長配管５（５ａ，５ｂ），６（６ａ，６ｂ）、圧縮機７、膨張弁（第２膨張弁）８、ファン９ａ，９ｂ，９ｃを備える。冷凍サイクル装置１００において、複数の室内熱交換器１、室外熱交換器２、六方弁３、閉止弁４、延長配管５，６、圧縮機７、および膨張弁（第２膨張弁）８は、互いに接続されており、冷媒が循環する冷媒回路を構成している。冷凍サイクル装置１００は、複数の閉止弁４ａ，４ｂを備える。全ての室内熱交換器１ａ，１ｂは、それぞれ閉止弁４ａ，４ｂを介して六方弁３と接続されている。(Embodiment 1)
<Configuration of refrigeration cycle equipment>
Next, the refrigeration cycle apparatus 100 according to the first embodiment will be described with reference to FIG. The refrigeration cycle device 100 includes a plurality of indoor heat exchangers 1 (1a, 1b), outdoor heat exchangers 2, hexagonal valves 3, shutoff valves 4 (4a, 4b), extension pipes 5 (5a, 5b), 6 (6a). , 6b), a compressor 7, an expansion valve (second expansion valve) 8, and fans 9a, 9b, 9c. In the refrigeration cycle device 100, the plurality of indoor heat exchangers 1, outdoor heat exchangers 2, hexagonal valves 3, shutoff valves 4, extension pipes 5, 6 and compressors 7 and expansion valves (second expansion valves) 8 are They are connected to each other and form a refrigerant circuit in which the refrigerant circulates. The refrigeration cycle device 100 includes a plurality of shutoff valves 4a and 4b. All the indoor heat exchangers 1a and 1b are connected to the hexagonal valve 3 via the shutoff valves 4a and 4b, respectively.

複数の室内熱交換器１ａ，１ｂは、個別に運転状態と停止状態とを切り替え可能に設けられている。複数の室内熱交換器１ａ，１ｂは、それぞれ運転状態において冷媒と室内の空気との熱交換を行う。複数の室内熱交換器１ａ，１ｂは六方弁３に対し互いに並列に接続されている。複数の室内熱交換器１ａ，１ｂの入側が六方弁３のポート３６とそれぞれ接続されており、複数の室内熱交換器１ａ，１ｂの出側が六方弁３のポート３４とそれぞれ接続されている。 The plurality of indoor heat exchangers 1a and 1b are individually provided so as to be able to switch between an operating state and a stopped state. The plurality of indoor heat exchangers 1a and 1b exchange heat between the refrigerant and the indoor air in the operating state, respectively. The plurality of indoor heat exchangers 1a and 1b are connected to the hexagonal valve 3 in parallel with each other. The inlet sides of the plurality of indoor heat exchangers 1a and 1b are connected to the ports 36 of the hexagonal valve 3, respectively, and the outlet sides of the plurality of indoor heat exchangers 1a and 1b are connected to the ports 34 of the hexagonal valve 3, respectively.

室外熱交換器２は、冷媒と室外の空気との熱交換を行う。六方弁３は、制御装置（図示しない）からの制御信号に応じて、冷房運転時の冷房サイクル状態（図１の実線参照）と暖房運転時の暖房サイクル状態（図１の破線参照）とのいずれかの状態に切り替え可能に設けられている。複数の室内熱交換器１ａ，１ｂは室外熱交換器２と六方弁３を介して接続されている。 The outdoor heat exchanger 2 exchanges heat between the refrigerant and the outdoor air. The hexagonal valve 3 has a cooling cycle state during the cooling operation (see the solid line in FIG. 1) and a heating cycle state during the heating operation (see the broken line in FIG. 1) in response to a control signal from a control device (not shown). It is provided so that it can be switched to either state. The plurality of indoor heat exchangers 1a and 1b are connected to the outdoor heat exchanger 2 via a hexagonal valve 3.

図２および図３を参照して、六方弁３は、たとえばスライド式の切り替え弁として構成されている。六方弁３は、中空の枠体である弁本体３０と、弁本体３０に接続された６つのポート３１，３２，３３，３４，３５，３６を有している。５つのポート３２，３３，３４，３５，３６は、弁本体３０に対しポート３１の反対側において、弁本体３０の延在方向に配列されている。ポート３１は、圧縮機７の吐出側と接続されている。ポート３２は、室外熱交換器２と接続されている。ポート３２は、冷房運転時における室外熱交換器２の入側、暖房運転時における室外熱交換器２の出側と接続されている。ポート３３は、圧縮機７の吸入側と接続されている。ポート３４は、複数の室内熱交換器１ａ，１ｂの出側と接続されている。ポート３５は、膨張弁８を介して室外熱交換器２と接続されている。ポート３５は、冷房運転時における室外熱交換器２の出側、暖房運転時における室外熱交換器２の入側と接続されている。ポート３６は、複数の室内熱交換器１ａ，１ｂの入側と接続されている。 With reference to FIGS. 2 and 3, the hexagonal valve 3 is configured as, for example, a sliding switching valve. The hexagonal valve 3 has a valve body 30 which is a hollow frame body, and six ports 31, 32, 33, 34, 35, 36 connected to the valve body 30. The five ports 32, 33, 34, 35, 36 are arranged on the opposite side of the port 31 with respect to the valve body 30 in the extending direction of the valve body 30. The port 31 is connected to the discharge side of the compressor 7. The port 32 is connected to the outdoor heat exchanger 2. The port 32 is connected to the inlet side of the outdoor heat exchanger 2 during the cooling operation and the outlet side of the outdoor heat exchanger 2 during the heating operation. The port 33 is connected to the suction side of the compressor 7. The port 34 is connected to the outlet side of the plurality of indoor heat exchangers 1a and 1b. The port 35 is connected to the outdoor heat exchanger 2 via the expansion valve 8. The port 35 is connected to the outlet side of the outdoor heat exchanger 2 during the cooling operation and the inlet side of the outdoor heat exchanger 2 during the heating operation. The port 36 is connected to the inlet side of the plurality of indoor heat exchangers 1a and 1b.

弁本体３０内には、上記延在方向にスライド可能なスライド弁体３９が設けられている。スライド弁体３９内には、２つの管路が設けられている。スライド弁体３９内の当該２つの管路は、それぞれ５つのポート３２，３３，３４，３５，３６のうちの２つのポート間を接続可能に設けられている。弁本体３０内には、スライド弁体３９内の２つの流路と、スライド弁体３９の外側において上記２つの管路と接続されていない１つのポートとポート３１との間の１つの流路とが形成されている。 A slide valve body 39 slidable in the extending direction is provided in the valve body 30. Two pipelines are provided in the slide valve body 39. The two pipelines in the slide valve body 39 are provided so as to be able to connect between two of the five ports 32, 33, 34, 35, and 36, respectively. In the valve body 30, there are two flow paths in the slide valve body 39 and one flow path between one port and the port 31 which are not connected to the above two pipelines outside the slide valve body 39. And are formed.

図２に示されるように、六方弁３は、冷房運転時にはポート３１とポート３２、ポート３３とポート３４、ポート３５とポート３６が、それぞれ接続される。図３に示されるように、六方弁３は、暖房運転時には、ポート３１とポート３６、ポート３２とポート３３、ポート３４とポート３５が、それぞれ接続される。六方弁３のポート３６は、冷房運転時または暖房運転時に関わらず、室内熱交換器１ａ，１ｂに冷媒を流出する流出ポートとして機能する。六方弁３のポート３４は、冷房運転時または暖房運転時に関わらず、室内熱交換器１ａ，１ｂから冷媒を流入可能に設けられている。 As shown in FIG. 2, in the hexagonal valve 3, ports 31 and 32, ports 33 and 34, and ports 35 and 36 are connected to each other during cooling operation. As shown in FIG. 3, in the hexagonal valve 3, port 31 and port 36, port 32 and port 33, and port 34 and port 35 are connected to each other during the heating operation. The port 36 of the hexagonal valve 3 functions as an outflow port for flowing out the refrigerant to the indoor heat exchangers 1a and 1b regardless of the cooling operation or the heating operation. The port 34 of the hexagonal valve 3 is provided so that the refrigerant can flow in from the indoor heat exchangers 1a and 1b regardless of the cooling operation or the heating operation.

六方弁３のポート３６と各室内熱交換器１ａ，１ｂとの間を接続する配管は、ポート３６に接続されている部分と、当該ポート３６に接続されている部分から分岐されて互いに並列に構成されており、かつ各室内熱交換器１ａ，１ｂと接続されている部分とを有する。閉止弁４ａおよび延長配管５ａは、六方弁３のポート３６と各室内熱交換器１ａ，１ｂとの間を接続する配管において室内熱交換器１ａと接続されている部分に設けられている。閉止弁４ｂおよび延長配管５ｂは、六方弁３のポート３６と各室内熱交換器１ａ，１ｂとの間を接続する配管において室内熱交換器１ｂと接続されている部分に設けられている。 Port 36 and the indoor heat exchangers 1a hexagonal valve 3, connects the 1b piping includes a portion connected to the port 3 6, parallel to each other is branched from a portion connected to the port 36 It has a portion connected to each of the indoor heat exchangers 1a and 1b. The shutoff valve 4a and the extension pipe 5a are provided in a portion of the pipe connecting the port 36 of the hexagonal valve 3 and the indoor heat exchangers 1a and 1b, which are connected to the indoor heat exchanger 1a. The shutoff valve 4b and the extension pipe 5b are provided in a portion of the pipe connecting the port 36 of the hexagonal valve 3 and the indoor heat exchangers 1a and 1b, which are connected to the indoor heat exchanger 1b.

閉止弁４ａ，４ｂは、それぞれ独立して冷媒の流れを遮断可能に設けられている。閉止弁４ａは、上述のように、六方弁３のポート３６と室内熱交換器１ａとの間を接続する配管上に設けられており、当該配管を閉止可能に設けられている。閉止弁４ｂは、上述のように、六方弁３のポート３６と室内熱交換器１ｂとの間を接続する配管上に設けられており、当該配管を閉止可能に設けられている。閉止弁４ａ，４ｂは、配管の閉止または開通を制御可能に設けられている限りにおいて任意の構成を備えていればよいが、たとえば電磁弁として構成されている。閉止弁４ａ，４ｂは、たとえば延長配管５ａ，５ｂよりも六方弁３に近い位置に設けられている。 The shutoff valves 4a and 4b are independently provided so as to be able to shut off the flow of the refrigerant. As described above, the shutoff valve 4a is provided on the pipe connecting the port 36 of the hexagonal valve 3 and the indoor heat exchanger 1a, and the pipe can be closed. As described above, the shutoff valve 4b is provided on the pipe connecting the port 36 of the hexagonal valve 3 and the indoor heat exchanger 1b, and the pipe can be closed. The shutoff valves 4a and 4b may have any configuration as long as the closing or opening of the pipe is controllably provided, but are configured as, for example, solenoid valves. The shutoff valves 4a and 4b are provided at positions closer to the hexagonal valve 3 than, for example, the extension pipes 5a and 5b.

延長配管５ａは、上述のように、六方弁３のポート３６と室内熱交換器１ａとの間に設けられており、より特定的には、閉止弁４ａと室内熱交換器１ａとの間に設けられている。延長配管５ｂは、上述のように、六方弁３のポート３６と室内熱交換器１ｂとの間に設けられており、より特定的には、閉止弁４ｂと室内熱交換器１ｂとの間に設けられている。 As described above, the extension pipe 5a is provided between the port 36 of the hexagonal valve 3 and the indoor heat exchanger 1a, and more specifically, between the shutoff valve 4a and the indoor heat exchanger 1a. It is provided. As described above, the extension pipe 5b is provided between the port 36 of the hexagonal valve 3 and the indoor heat exchanger 1b, and more specifically, between the shutoff valve 4b and the indoor heat exchanger 1b. It is provided.

延長配管６ａは、上述のように、室内熱交換器１ａと六方弁３のポート３４との間に設けられている。延長配管６ｂは、上述のように、室内熱交換器１ｂと六方弁３のポート３４との間に設けられている。 As described above, the extension pipe 6a is provided between the indoor heat exchanger 1a and the port 34 of the hexagonal valve 3. As described above, the extension pipe 6b is provided between the indoor heat exchanger 1b and the port 34 of the hexagonal valve 3.

圧縮機７は、六方弁３のポート３３から吸入される冷媒を圧縮して六方弁３のポート３１へ吐出する。膨張弁８は、冷房運転時において、室外熱交換器２から六方弁３のポート３５へ流れる冷媒を膨張させる。膨張弁８は、暖房運転時において、六方弁３のポート３５から室外熱交換器２へ流れる冷媒を膨張させる。ファン９ａ，９ｂ，９ｃは、それぞれ室内熱交換器１ａ，１ｂ、室外熱交換器２に対して送風可能に設けられている。 The compressor 7 compresses the refrigerant sucked from the port 33 of the hexagonal valve 3 and discharges it to the port 31 of the hexagonal valve 3. The expansion valve 8 expands the refrigerant flowing from the outdoor heat exchanger 2 to the port 35 of the hexagonal valve 3 during the cooling operation. The expansion valve 8 expands the refrigerant flowing from the port 35 of the hexagonal valve 3 to the outdoor heat exchanger 2 during the heating operation. The fans 9a, 9b, and 9c are provided so as to be able to blow air to the indoor heat exchangers 1a and 1b and the outdoor heat exchanger 2, respectively.

冷凍サイクル装置１００において循環される流体は、水または不凍液（ブライン）と、冷媒である。冷媒は、たとえば少なくとも２種類以上の冷媒を混合した混合冷媒である。冷媒は、共沸混合冷媒であってもよいし、非共沸混合冷媒であってもよい。 The fluid circulated in the refrigeration cycle device 100 is water or antifreeze liquid (brine) and a refrigerant. The refrigerant is, for example, a mixed refrigerant in which at least two or more types of refrigerants are mixed. The refrigerant may be an azeotropic mixed refrigerant or a non-azeotropic mixed refrigerant.

＜冷凍サイクル装置の動作＞
次に、図１〜図３を参照して、冷凍サイクル装置１００の動作について説明する。はじめに、複数の室内熱交換器１ａ，１ｂが全て動作状態にあるときについて説明する。冷房運転時では、六方弁３は図２に示される構成を採るように制御される。これにより、冷凍サイクル装置１００は、図１において実線で示される冷房サイクル状態に置かれる。圧縮機７から吐出された冷媒は、六方弁３のポート３１およびポート３２を通って、室外熱交換器２に達し、室外熱交換器２において室外の空気と熱交換されて凝縮される。凝縮された冷媒は、膨張弁８を通って膨張される。膨張された冷媒は、六方弁３のポート３５、ポート３６および開放された閉止弁４ａ，４ｂを通って、室内熱交換器１ａ，１ｂに達し、室内熱交換器１ａ，１ｂにおいて室内の空気と熱交換されて蒸発される。<Operation of refrigeration cycle device>
Next, the operation of the refrigeration cycle apparatus 100 will be described with reference to FIGS. 1 to 3. First, a case where a plurality of indoor heat exchangers 1a and 1b are all in an operating state will be described. During the cooling operation, the hexagonal valve 3 is controlled to adopt the configuration shown in FIG. As a result, the refrigeration cycle device 100 is placed in the cooling cycle state shown by the solid line in FIG. The refrigerant discharged from the compressor 7 reaches the outdoor heat exchanger 2 through the ports 31 and 32 of the hexagonal valve 3, and is heat-exchanged with the outdoor air in the outdoor heat exchanger 2 to be condensed. The condensed refrigerant is expanded through the expansion valve 8. The expanded refrigerant passes through the ports 35 and 36 of the hexagonal valve 3 and the open shutoff valves 4a and 4b, reaches the indoor heat exchangers 1a and 1b, and with the indoor air in the indoor heat exchangers 1a and 1b. It is heat exchanged and evaporated.

次に、複数の室内熱交換器１ａ，１ｂのうち、一部の室内熱交換器１ａが動作状態に、他の室内熱交換器１ｂが停止状態にあるときについて説明する。この場合には、閉止弁４ｂが閉止される。膨張弁８により膨張された冷媒は、閉止弁４ｂが閉止されていることにより室内熱交換器１ｂに流れず、開放された閉止弁４ａを通って、室内熱交換器１ａに達し、室内熱交換器１ａにおいて室内の空気と熱交換されて蒸発される。 Next, of the plurality of indoor heat exchangers 1a and 1b, when some of the indoor heat exchangers 1a are in the operating state and the other indoor heat exchangers 1b are in the stopped state will be described. In this case, the shutoff valve 4b is closed. The refrigerant expanded by the expansion valve 8 does not flow to the indoor heat exchanger 1b because the closing valve 4b is closed, but reaches the indoor heat exchanger 1a through the opened closing valve 4a to exchange indoor heat. In the vessel 1a, heat is exchanged with the air in the room and evaporated.

＜作用効果＞
次に、冷凍サイクル装置１００の作用効果について説明する。冷凍サイクル装置１００は、運転状態において冷媒と室内の空気との熱交換を行い、個別に運転状態と停止状態とを切り替え可能に設けられている複数の室内熱交換器１ａ，１ｂと、冷媒と室外の空気との熱交換を行う室外熱交換器２と、冷媒の流路を切り替える六方弁３と、冷媒を圧縮するための圧縮機７と、冷媒の流れを遮断可能に設けられている閉止弁４ａ，４ｂとを備える。複数の室内熱交換器１ａ，１ｂは室外熱交換器２と六方弁３を介して接続されている。複数の室内熱交換器１ａ，１ｂは六方弁３に対し互いに並列に接続されている。複数の室内熱交換器１ａ，１ｂの少なくとも１つは六方弁３と閉止弁４ａ，４ｂを介して接続されている。<Effect>
Next, the operation and effect of the refrigeration cycle device 100 will be described. The refrigeration cycle device 100 exchanges heat between the refrigerant and the air in the room in the operating state, and is provided with a plurality of indoor heat exchangers 1a and 1b that can individually switch between the operating state and the stopped state, and the refrigerant. An outdoor heat exchanger 2 that exchanges heat with the outdoor air, a hexagonal valve 3 that switches the flow path of the refrigerant, a compressor 7 for compressing the refrigerant, and a closure provided so as to block the flow of the refrigerant. It is provided with valves 4a and 4b. The plurality of indoor heat exchangers 1a and 1b are connected to the outdoor heat exchanger 2 via a hexagonal valve 3. The plurality of indoor heat exchangers 1a and 1b are connected to the hexagonal valve 3 in parallel with each other. At least one of the plurality of indoor heat exchangers 1a and 1b is connected to the hexagonal valve 3 via the shutoff valves 4a and 4b.

このようにすれば、複数の室内熱交換器１ａ，１ｂのうちの一部の室内熱交換器１ａが運転状態、他の室内熱交換器１ｂが停止状態にあるときに、停止状態にある室内熱交換器１ｂと六方弁３との間の冷媒の流れを、閉止弁４ｂにより遮断することができる。その結果、冷凍サイクル装置１００によれば、停止状態にある室内熱交換器１ｂに冷媒が流入しかつ滞留することが抑制されている。 In this way, when some of the indoor heat exchangers 1a and 1b of the plurality of indoor heat exchangers 1a and 1b are in the operating state and the other indoor heat exchangers 1b are in the stopped state, the room is in the stopped state. The flow of the refrigerant between the heat exchanger 1b and the hexagonal valve 3 can be blocked by the shutoff valve 4b. As a result, according to the refrigeration cycle device 100, it is suppressed that the refrigerant flows into and stays in the indoor heat exchanger 1b in the stopped state.

また、複数の室内熱交換器１ａ，１ｂは、六方弁３により、冷房運転時および暖房運転時においても冷媒の流通方向が一定であり、逆転しない。具体的には、複数の室内熱交換器１ａ，１ｂが並列に接続されている六方弁３のポート３６は、冷房運転時には膨張弁８を介して室外熱交換器２と接続されたポート３５と接続され、暖房運転時には圧縮機７の吐出側と接続されたポート３１と接続される。そのため、冷房運転時および暖房運転時においても、複数の室内熱交換器１ａ，１ｂに流れる冷媒は、六方弁３のポート３６から流入し、ポート３４へ流出される。冷凍サイクル装置１００によれば、冷房運転時および暖房運転時においても、室内熱交換器１ａ，１ｂを温度対向流化することができる。そのため、冷凍サイクル装置１００は、高い伝熱性能を有している。また、冷凍サイクル装置１００によれば、室内熱交換器が冷房運転時または暖房運転時のいずれかにおいて冷媒と空気とが平行流化する従来の冷凍サイクル装置と比べて、室内熱交換器１ａ，１ｂにおける冷媒と空気との間の対数平均温度差を大きくすることができる。そのため、冷凍サイクル装置１００は、非共沸混合冷媒が封入され室内熱交換器１ａ，１ｂ内において温度勾配が形成される場合にも、熱交換性能の低下が抑制されている。さらに、冷凍サイクル装置１００は、室内熱交換器１ａ，１ｂの上記対数平均温度差が大きいため、室内熱交換器１ａ，１ｂの熱交換量を所定の値としたときの圧縮機７の吸入側の冷媒圧力を、上記従来の冷凍サイクル装置と比べて、高圧化することができる。そのため、冷凍サイクル装置１００によれば、上記従来の冷凍サイクル装置と比べて、圧縮機７での冷媒の圧縮率を低くすることができ、冷凍サイクルの効率を向上させることができる。 Further, in the plurality of indoor heat exchangers 1a and 1b, the flow direction of the refrigerant is constant and does not reverse even during the cooling operation and the heating operation due to the hexagonal valve 3. Specifically, the port 36 of the hexagonal valve 3 to which a plurality of indoor heat exchangers 1a and 1b are connected in parallel is connected to the port 35 connected to the outdoor heat exchanger 2 via the expansion valve 8 during the cooling operation. It is connected and is connected to the port 31 connected to the discharge side of the compressor 7 during the heating operation. Therefore, even during the cooling operation and the heating operation, the refrigerant flowing through the plurality of indoor heat exchangers 1a and 1b flows in from the port 36 of the hexagonal valve 3 and flows out to the port 34. According to the refrigeration cycle device 100, the indoor heat exchangers 1a and 1b can be countercurrented even during the cooling operation and the heating operation. Therefore, the refrigeration cycle device 100 has high heat transfer performance. Further, according to the refrigerating cycle device 100, the indoor heat exchanger 1a, as compared with the conventional refrigerating cycle device in which the refrigerant and the air flow in parallel during either the cooling operation or the heating operation of the indoor heat exchanger. The logarithmic mean temperature difference between the refrigerant and air in 1b can be increased. Therefore, in the refrigeration cycle device 100, even when the non-azeotropic mixed refrigerant is sealed and the temperature gradient is formed in the indoor heat exchangers 1a and 1b, the deterioration of the heat exchange performance is suppressed. Further, since the refrigeration cycle device 100 has a large logarithmic mean temperature difference between the indoor heat exchangers 1a and 1b, the suction side of the compressor 7 when the heat exchange amount of the indoor heat exchangers 1a and 1b is set to a predetermined value. The refrigerant pressure can be increased as compared with the above-mentioned conventional refrigeration cycle apparatus. Therefore, according to the refrigeration cycle device 100, the compression rate of the refrigerant in the compressor 7 can be lowered as compared with the conventional refrigeration cycle device, and the efficiency of the refrigeration cycle can be improved.

また、冷凍サイクル装置１００は、六方弁３により複数の室内熱交換器１ａ，１ｂを上記対向流化可能に設けられているため、四方弁やブリッジ回路などを複数台組み合わせることにより対向流化可能に設けられている従来の冷凍サイクル装置と比べて、小型化することができる。また、冷凍サイクル装置１００は、従来の冷凍サイクル装置において上述のような複数の室内熱交換器の対向流化および室内熱交換器での冷媒滞留防止を実現する場合と比べて、部品点数を少なくすることができ、信頼性が向上されている。 Further, since the refrigeration cycle device 100 is provided with a plurality of indoor heat exchangers 1a and 1b capable of countercurrent exchange by means of a hexagonal valve 3, it is possible to countercurrent by combining a plurality of four-way valves, bridge circuits and the like. It can be downsized as compared with the conventional refrigeration cycle apparatus provided in. Further, the refrigerating cycle device 100 has a smaller number of parts than the case where the conventional refrigerating cycle device realizes countercurrent exchange of a plurality of indoor heat exchangers and prevention of refrigerant retention in the indoor heat exchangers as described above. It can be done and the reliability is improved.

なお、複数の室内熱交換器１ａ，１ｂのうち、一部の室内熱交換器１ｂのみが動作状態と停止状態との切り替えが行われ得る場合には、当該一部の室内熱交換器１ｂと六方弁３との間にのみ閉止弁４ｂが設けられていればよい。複数の室内熱交換器１ａ，１ｂの全てが動作状態と停止状態との切り替えが行われ得る場合には、全ての室内熱交換器１ａ，１ｂと六方弁３との間に，それぞれ閉止弁４ａ，４ｂが設けられている。 If only some of the indoor heat exchangers 1b among the plurality of indoor heat exchangers 1a and 1b can be switched between the operating state and the stopped state, the indoor heat exchangers 1b and some of them can be switched. The shutoff valve 4b need only be provided between the hexagonal valve 3 and the hexagonal valve 3. When all of the plurality of indoor heat exchangers 1a and 1b can be switched between the operating state and the stopped state, the shutoff valve 4a is located between all the indoor heat exchangers 1a and 1b and the hexagonal valve 3, respectively. , 4b are provided.

閉止弁４ａ，４ｂは、たとえば電磁弁として構成されていてもよい。このようにすれば、閉止弁４ａ，４ｂはそれぞれ独立にかつ容易に制御され得る。 The shutoff valves 4a and 4b may be configured as, for example, solenoid valves. In this way, the shutoff valves 4a and 4b can be controlled independently and easily.

図４および図５を参照して、六方弁３は、ロータリー式の切り替え弁として構成されていてもよい。六方弁３は、弁本体３０と、弁本体３０に接続された６つのポート３１，３２，３３，３４，３５，３６を有している。弁本体３０は、たとえば相対的に回転可能に設けられた第１弁体３０Ａと第２弁体３０Ｂとを含む。ポート３１は第１弁体３０Ａに、ポート３２，３３，３４，３５，３６は第２弁体３０Ｂに接続されている。ポート３２，３３，３４，３５，３６は、第２弁体３０Ｂの周方向に配列されている。第１弁体３０Ａには３つの管路４１，４２，４３が形成されている。第２弁体３０Ｂには、ポート３２，３３，３４，３５，３６のそれぞれと接続された５つの管路が形成されている。このようにすれば、六方弁３による冷房運転と暖房運転との切り替え時に、切り替え音抑制のために圧縮機７を一旦停止させることなく、当該切り替えを行うことができる。また、冷凍サイクル装置１００は、圧縮機７を一旦停止させることなく上記切り替えを行うことができるため、切り替え後の運転状態が安定化するまでに要する時間が短い。 With reference to FIGS. 4 and 5, the hexagonal valve 3 may be configured as a rotary switching valve. The hexagonal valve 3 has a valve body 30 and six ports 31, 32, 33, 34, 35, 36 connected to the valve body 30. The valve body 30 includes, for example, a first valve body 30A and a second valve body 30B provided so as to be relatively rotatable. The port 31 is connected to the first valve body 30A, and the ports 32, 33, 34, 35, 36 are connected to the second valve body 30B. The ports 32, 33, 34, 35, 36 are arranged in the circumferential direction of the second valve body 30B. Three pipelines 41, 42, and 43 are formed in the first valve body 30A. The second valve body 30B is formed with five pipelines connected to each of the ports 32, 33, 34, 35, and 36. In this way, when switching between the cooling operation and the heating operation by the hexagonal valve 3, the switching can be performed without temporarily stopping the compressor 7 to suppress the switching sound. Further, since the refrigeration cycle device 100 can perform the above switching without temporarily stopping the compressor 7, the time required for the operating state after the switching to stabilize is short.

管路４１は、第１弁体３０Ａと第２弁体３０Ｂとの相対的な回転動作に関わらず、常時ポート３１と接続可能に設けられている。管路４１は、第１弁体３０Ａと第２弁体３０Ｂとの相対的な回転動作により、ポート３２またはポート３６と接続可能に設けられている。管路４１は、上記回転動作により、ポート３１とポート３２との間、またはポート３１とポート３６との間に流路を形成可能に設けられている。管路４２，４３は、それぞれポート３２，３３，３４，３５，３６のうちの２つのポート間を接続可能に設けられている。管路４２は、上記回転動作により、ポート３３とポート３４との間、またはポート３２とポート３３との間に流路を形成可能に設けられている。管路４３は、上記回転動作により、ポート３５とポート３６との間、またはポート３４とポート３５との間に流路を形成可能に設けられている。このようにしても、六方弁３は、図１において実線で示される冷房サイクル状態と図１において破線で示される暖房サイクル状態とに切り替え可能である。 The pipeline 41 is provided so as to be always connectable to the port 31 regardless of the relative rotational operation between the first valve body 30A and the second valve body 30B. The pipeline 41 is provided so as to be connectable to the port 32 or the port 36 by the relative rotational operation of the first valve body 30A and the second valve body 30B. The pipeline 41 is provided so that a flow path can be formed between the port 31 and the port 32 or between the port 31 and the port 36 by the rotation operation. The pipelines 42 and 43 are provided so as to be able to connect between two ports of the ports 32, 33, 34, 35 and 36, respectively. The pipeline 42 is provided so that a flow path can be formed between the port 33 and the port 34 or between the port 32 and the port 33 by the rotation operation. The pipeline 43 is provided so that a flow path can be formed between the port 35 and the port 36 or between the port 34 and the port 35 by the rotation operation. Even in this way, the hexagonal valve 3 can be switched between the cooling cycle state shown by the solid line in FIG. 1 and the heating cycle state shown by the broken line in FIG.

（実施の形態２）
次に、図６を参照して、実施の形態２に係る冷凍サイクル装置１０１について説明する。冷凍サイクル装置１０１は、基本的には冷凍サイクル装置１００と同様の構成を備えるが、閉止弁が膨張弁（第１膨張弁）１０ａ，１０ｂとして構成されている点で異なる。(Embodiment 2)
Next, the refrigeration cycle apparatus 101 according to the second embodiment will be described with reference to FIG. The refrigeration cycle device 101 basically has the same configuration as the refrigeration cycle device 100, except that the shutoff valves are configured as expansion valves (first expansion valves) 10a and 10b.

膨張弁１０ａ，１０ｂは、それぞれ独立して冷媒の流れを遮断可能に設けられている。膨張弁１０ａは、六方弁３のポート３６と室内熱交換器１ａとの間を接続する配管上に設けられている。膨張弁１０ｂは、上述のように、六方弁３のポート３６と室内熱交換器１ｂとの間を接続する配管上に設けられている。膨張弁１０ａ，１０ｂは、その開度に応じて、各配管を閉止可能であり、または、各配管に流れる冷媒を膨張可能である。膨張弁１０ａ，１０ｂは、室内熱交換器１ａ，１ｂが停止状態にあるときには各配管を閉止し、室内熱交換器１ａ，１ｂが運転状態にあるときには各配管に流れる冷媒を膨張させるように制御される。膨張弁１０ａ，１０ｂは、たとえば延長配管５ａ，５ｂよりも六方弁３に近い位置に設けられている。 The expansion valves 10a and 10b are independently provided so as to be able to block the flow of the refrigerant. The expansion valve 10a is provided on a pipe connecting the port 36 of the hexagonal valve 3 and the indoor heat exchanger 1a. As described above, the expansion valve 10b is provided on the pipe connecting the port 36 of the hexagonal valve 3 and the indoor heat exchanger 1b. The expansion valves 10a and 10b can close each pipe or expand the refrigerant flowing through each pipe according to the opening degree thereof. The expansion valves 10a and 10b are controlled so as to close each pipe when the indoor heat exchangers 1a and 1b are stopped and expand the refrigerant flowing through each pipe when the indoor heat exchangers 1a and 1b are in the operating state. Will be done. The expansion valves 10a and 10b are provided at positions closer to the hexagonal valve 3 than, for example, the extension pipes 5a and 5b.

このようにしても、複数の室内熱交換器１ａ，１ｂのうちの一部の室内熱交換器１ａが運転状態、他の室内熱交換器１ｂが停止状態にあるときに、停止状態にある室内熱交換器１ｂと六方弁３との間の冷媒の流れを、膨張弁１０ｂにより遮断することができる。その結果、冷凍サイクル装置１０１によれば、停止状態にある室内熱交換器１ｂに冷媒が流入しかつ滞留することが抑制されている。冷凍サイクル装置１０１は、冷凍サイクル装置１００と同様の構成を備える六方弁３を備えるため、冷房運転時および暖房運転時においても、室内熱交換器１ａ，１ｂを温度対向流化することができる。 Even in this way, when some of the indoor heat exchangers 1a and 1b of the plurality of indoor heat exchangers 1a and 1b are in the operating state and the other indoor heat exchangers 1b are in the stopped state, the room is in the stopped state. The flow of the refrigerant between the heat exchanger 1b and the hexagonal valve 3 can be blocked by the expansion valve 10b. As a result, according to the refrigeration cycle apparatus 10 1, it is suppressed to be the refrigerant flows and stays in the indoor heat exchanger 1b in a stopped state. Since the refrigeration cycle device 101 includes a hexagonal valve 3 having the same configuration as the refrigeration cycle device 100, the indoor heat exchangers 1a and 1b can be countercurrented even during the cooling operation and the heating operation.

なお、冷凍サイクル装置１０１において、膨張弁８は、冷房運転時において、全開放されているのが好ましい。一般に、冷房運転時には、室外熱交換器において凝縮された液状態の冷媒（液冷媒）は、膨張弁により減圧膨張されて気液２相状態で室内熱交換器に送られる。冷凍サイクル装置１０１では、室外熱交換器２と室内熱交換器１ａ，１ｂとの間には、室外熱交換器２と六方弁３との間に位置する膨張弁８と、六方弁３と室内熱交換器１ａ，１ｂとの間に位置する膨張弁１０ａ，１０ｂとが設けられている。そのため、室内熱交換器１ａ，１ｂに送られる冷媒は、少なくとも膨張弁１０ａ，１０ｂにおいて膨張されていればよい。冷房運転時において膨張弁８を全開放とすることで、六方弁３のポート３５からポート３６には気液２相状態の冷媒ではなく液冷媒を流すことができる。その結果、六方弁３内における冷媒の流れを安定化させることができる。また、冷房運転時において六方弁３に流通させる冷媒を気液２相状態の冷媒ではなく液冷媒とすることにより、冷媒の圧力損失を低減することができる。 In the refrigeration cycle device 101, it is preferable that the expansion valve 8 is fully opened during the cooling operation. Generally, during the cooling operation, the liquid refrigerant (liquid refrigerant) condensed in the outdoor heat exchanger is decompressed and expanded by the expansion valve and sent to the indoor heat exchanger in a gas-liquid two-phase state. In the refrigeration cycle device 101, between the outdoor heat exchanger 2 and the indoor heat exchangers 1a and 1b, an expansion valve 8 located between the outdoor heat exchanger 2 and the hexagonal valve 3 and a hexagonal valve 3 and the indoor Expansion valves 10a and 10b located between the heat exchangers 1a and 1b are provided. Therefore, the refrigerant sent to the indoor heat exchangers 1a and 1b may be expanded at least by the expansion valves 10a and 10b. By fully opening the expansion valve 8 during the cooling operation, the liquid refrigerant can flow from the port 35 to the port 36 of the hexagonal valve 3 instead of the gas-liquid two-phase state refrigerant. As a result, the flow of the refrigerant in the hexagonal valve 3 can be stabilized. Further, the pressure loss of the refrigerant can be reduced by using the liquid refrigerant instead of the gas-liquid two-phase state refrigerant to be distributed to the hexagonal valve 3 during the cooling operation.

今回開示された実施の形態はすべての点において例示であって制限的なものでは無いと考えられるべきである。本発明の範囲は、上記した説明ではなくて請求の範囲によって示され、請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 The embodiments disclosed this time should be considered to be exemplary and not restrictive in all respects. The scope of the present invention is indicated by the scope of claims rather than the above description, and it is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

本発明に係る冷凍サイクル装置は、個別に運転動作・停止動作を切り替え可能に設けられている複数の室内機を備える冷凍サイクル装置に特に有利に適用される。 The refrigeration cycle apparatus according to the present invention is particularly advantageously applied to a refrigeration cycle apparatus including a plurality of indoor units that are individually provided so as to be able to switch between operation and stop operations.

１，１ａ，１ｂ 室内熱交換器、２ 室外熱交換器、３ 六方弁、４，４ａ，４ｂ 閉止弁、５，５ａ，５ｂ，６，６ａ，６ｂ 延長配管、７ 圧縮機、８ 膨張弁、１０ａ，１０ｂ 膨張弁、９ａ，９ｂ，９ｃ ファン、３０ 弁本体、３０Ａ 第１弁体、３０Ｂ
第２弁体、３１，３２，３３，３４，３５，３６ ポート、３９ スライド弁体、４１，４２，４３ 管路、１００，１０１ 冷凍サイクル装置。1,1a, 1b Indoor heat exchanger, 2 Outdoor heat exchanger, 3 Hexagonal valve, 4,4a, 4b Closure valve, 5,5a, 5b, 6,6a, 6b Extension piping, 7 Compressor, 8 Expansion valve, 10a, 10b expansion valve, 9a, 9b, 9c fan, 30 valve body, 30A first valve body, 30B
Second valve body, 31, 32, 33, 34, 35, 36 ports, 39 slide valve body, 41, 42, 43 pipelines, 100, 101 refrigeration cycle equipment.

Claims (5)

冷媒と室内の空気との熱交換を行う複数の室内熱交換器と、
前記冷媒と室外の空気との熱交換を行う室外熱交換器と、
前記冷媒の流路を切り替える六方弁と、
前記冷媒を圧縮するための圧縮機と、
前記冷媒の流れを遮断可能に設けられている第１膨張弁とを備え、
前記複数の室内熱交換器は前記室外熱交換器と前記六方弁を介して接続されており、
前記複数の室内熱交換器は前記六方弁に対し互いに並列に接続されており、
前記複数の室内熱交換器の少なくとも１つは、前記六方弁と、前記第１膨張弁および延長配管を介して接続されており、
前記室外熱交換器と前記六方弁との間に配置された第２膨張弁をさらに備え、
前記第１膨張弁は、前記六方弁と前記複数の室内熱交換器の少なくとも１つとの間において前記延長配管よりも前記六方弁に近い側に配置されており、
冷房運転時に、前記圧縮機から吐出された前記冷媒が、前記六方弁、前記室外熱交換器、前記第２膨張弁、前記六方弁、前記第１膨張弁、前記延長配管、前記複数の室内熱交換器の少なくとも１つ、および前記六方弁を順に流れ、暖房運転時に、前記圧縮機から吐出された前記冷媒が、前記六方弁、前記第１膨張弁、前記延長配管、前記複数の室内熱交換器の少なくとも１つ、前記六方弁、前記第２膨張弁、前記室外熱交換器、前記六方弁を順に流れるように前記六方弁は制御され、かつ前記冷房運転時に前記室外熱交換器において凝縮された冷媒は、前記第１膨張弁と前記第２膨張弁とのうち、少なくとも前記第１膨張弁により減圧膨張されて前記複数の室内熱交換器の少なくとも１つに送られる、冷凍サイクル装置。 Multiple indoor heat exchangers that exchange heat between the refrigerant and the indoor air,
An outdoor heat exchanger that exchanges heat between the refrigerant and the outdoor air,
A six-way valve that switches the flow path of the refrigerant,
A compressor for compressing the refrigerant and
It is provided with a first expansion valve provided so as to block the flow of the refrigerant.
The plurality of indoor heat exchangers are connected to the outdoor heat exchanger via the hexagonal valve.
The plurality of indoor heat exchangers are connected to the hexagonal valve in parallel with each other.
At least one of the plurality of indoor heat exchangers is connected to the hexagonal valve via the first expansion valve and the extension pipe.
Further comprising a second expansion valve located between the outdoor heat exchanger and the hexagonal valve.
The first expansion valve is arranged between the hexagonal valve and at least one of the plurality of indoor heat exchangers on the side closer to the hexagonal valve than the extension pipe.
During the cooling operation, the refrigerant discharged from the compressor is the hexagonal valve, the outdoor heat exchanger , the second expansion valve, the hexagonal valve , the first expansion valve, the extension pipe, and the plurality of indoor heats. At least one of the exchangers and the six-way valve flow in order, and during the heating operation, the refrigerant discharged from the compressor is the six-way valve, the first expansion valve, the extension pipe, and the plurality of indoor heat exchanges. The hexagonal valve is controlled to flow through at least one of the vessels, the hexagonal valve, the second expansion valve, the outdoor heat exchanger, and the hexagonal valve in this order , and is condensed in the outdoor heat exchanger during the cooling operation. The refrigerating cycle apparatus in which the refrigerant is decompressed and expanded by at least the first expansion valve among the first expansion valve and the second expansion valve and sent to at least one of the plurality of indoor heat exchangers. 冷房運転時に、前記第２膨張弁は全開放される、請求項１に記載の冷凍サイクル装置。 The refrigeration cycle apparatus according to claim 1, wherein the second expansion valve is fully opened during the cooling operation. 前記冷媒は、少なくとも２種類以上の冷媒を混合した混合冷媒である、請求項１または２に記載の冷凍サイクル装置。 The refrigeration cycle apparatus according to claim 1 or 2, wherein the refrigerant is a mixed refrigerant in which at least two types of refrigerants are mixed. 前記冷媒は、非共沸混合冷媒である、請求項３に記載の冷凍サイクル装置。 The refrigeration cycle apparatus according to claim 3, wherein the refrigerant is a non-azeotropic mixed refrigerant. 前記第１膨張弁は、前記室内熱交換器の入側に配置されている、請求項１〜４のいずれか１項に記載の冷凍サイクル装置。 The refrigeration cycle apparatus according to any one of claims 1 to 4, wherein the first expansion valve is arranged on the inlet side of the indoor heat exchanger.
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