JP5293474B2 - Refrigeration cycle apparatus and control method of refrigeration cycle apparatus - Google Patents

Refrigeration cycle apparatus and control method of refrigeration cycle apparatus Download PDF

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JP5293474B2
JP5293474B2 JP2009168141A JP2009168141A JP5293474B2 JP 5293474 B2 JP5293474 B2 JP 5293474B2 JP 2009168141 A JP2009168141 A JP 2009168141A JP 2009168141 A JP2009168141 A JP 2009168141A JP 5293474 B2 JP5293474 B2 JP 5293474B2
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refrigerant
valve
indoor
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gas pipe
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JP2011021838A (en
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浩昭 中宗
慎一 若本
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Mitsubishi Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerating cycle device and a method of controlling the refrigerating cycle device capable of promptly recovering a refrigerant when refrigerant leakage is detected. <P>SOLUTION: This refrigerating cycle device includes a liquid pipe 4 as a pipe connecting an indoor heat exchanger 10 and an expansion valve 9, a gas pipe 3 as a pipe connecting a compressor 5 and the indoor heat exchanger 10, and a having a cross-sectional area of a flow channel larger than that of the liquid pipe 4, an inlet valve 14 disposed in a pipe at an inlet side of the compressor 5, a gas pipe valve 13 disposed in the gas pipe 3, an indoor leakage detection sensor 12 disposed indoors to detect the refrigerant leakage, and a control device closing the gas pipe valve 13 when the indoor leakage detection sensor 12 detects the refrigerant leakage, and closes the inlet valve 14 after the refrigerant at an indoor unit 1 side is recovered in the gas pipe 3 through the liquid pipe 4. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

この発明は、冷媒を用いて空調または給湯行う冷凍サイクル装置および冷凍サイクル装置の制御方法に関するものである。   The present invention relates to a refrigeration cycle apparatus that performs air conditioning or hot water supply using a refrigerant, and a method for controlling the refrigeration cycle apparatus.

冷媒を用いて空調または給湯を行う冷凍サイクル装置においては、室内に冷媒が漏洩すると、居住環境が悪化するおそれがあり、室外に冷媒が漏洩すると、地球温暖化係数の高い冷媒を用いている場合には、当該冷媒が大気中に放出されることになるので、冷媒の漏洩量をできるだけ低減する必要がある。   In a refrigeration cycle apparatus that performs air conditioning or hot water supply using a refrigerant, if the refrigerant leaks into the room, the living environment may deteriorate, and if the refrigerant leaks outside, a refrigerant with a high global warming potential is used. Therefore, since the refrigerant is released into the atmosphere, it is necessary to reduce the leakage amount of the refrigerant as much as possible.

従来の冷凍サイクル装置においては、室内ユニットと室外ユニットとをガス配管および液配管で冷媒回路を形成し、各配管途中にガス配管開閉弁および液配管開閉弁を設け、冷媒の漏洩を検知する漏洩検知装置が冷媒の漏洩を検知したときに液配管開閉弁を閉じ、冷媒をガス配管を介して室外ユニットに回収した後、ガス配管開閉弁を閉じるものがある（例えば、特許文献１）。   In a conventional refrigeration cycle apparatus, a refrigerant circuit is formed by gas piping and liquid piping between an indoor unit and an outdoor unit, and a gas piping opening / closing valve and a liquid piping opening / closing valve are provided in the middle of each piping to detect leakage of the refrigerant. There is one that closes the liquid pipe on / off valve when the detection device detects leakage of the refrigerant, closes the gas pipe on / off valve after collecting the refrigerant in the outdoor unit via the gas pipe (for example, Patent Document 1).

特開平５−１１８７２０号公報（第４頁、図１）Japanese Patent Laid-Open No. 5-118720 (page 4, FIG. 1)

上記のような冷凍サイクル装置においては、ガス管側に比べて液管側に多くの冷媒が滞留しているので、冷媒の漏洩を検知したときにガス管を介して冷媒を回収すると、速やかに回収できないという問題がある。   In the refrigeration cycle apparatus as described above, since a larger amount of refrigerant stays on the liquid pipe side than on the gas pipe side, when refrigerant is recovered through the gas pipe when leakage of the refrigerant is detected, There is a problem that it cannot be recovered.

本発明は、かかる問題点を解決するためになされたものであり、冷媒の漏洩を検知したときに速やかに冷媒を回収できる冷凍サイクル装置を提供することを目的としている。   The present invention has been made to solve such a problem, and an object of the present invention is to provide a refrigeration cycle apparatus that can quickly collect a refrigerant when leakage of the refrigerant is detected.

この発明による冷凍サイクル装置は、冷媒を圧縮する圧縮機、前記冷媒と室内の空気とを熱交換する室内熱交換器、冷媒を膨張する膨張弁および前記冷媒と室外の空気とを熱交換する室外熱交換器が配管で接続され、前記室内熱交換器は室内に設置される室内機に設けられ、前記圧縮機、前記膨張弁および前記室外熱交換器は室外に設置される室外機に設けられる冷凍サイクル装置において、前記室内熱交換器と前記膨張弁との間を接続する配管である液管、前記圧縮機と前記室内熱交換器との間を接続する配管であり、前記液管より大きい流路断面積を有するガス管、前記圧縮機の吸入側の配管に設けられる吸入弁、前記ガス管に設けられるガス管弁、前記室内に設けられ前記冷媒の漏洩を検知する室内漏洩検知センサ、前記室内漏洩検知センサが前記冷媒の漏洩を検知した場合に、前記ガス管弁を閉じ、前記室内機側の冷媒を前記液管を介して前記ガス管に回収した後に前記吸入弁を閉じる制御装置を備えたものである。   The refrigeration cycle apparatus according to the present invention includes a compressor that compresses refrigerant, an indoor heat exchanger that exchanges heat between the refrigerant and indoor air, an expansion valve that expands refrigerant, and an outdoor that exchanges heat between the refrigerant and outdoor air. A heat exchanger is connected by piping, the indoor heat exchanger is provided in an indoor unit installed indoors, and the compressor, the expansion valve, and the outdoor heat exchanger are provided in an outdoor unit installed outdoor. In the refrigeration cycle apparatus, a liquid pipe that is a pipe that connects the indoor heat exchanger and the expansion valve, a pipe that connects the compressor and the indoor heat exchanger, and is larger than the liquid pipe A gas pipe having a flow path cross-sectional area, a suction valve provided in a pipe on the suction side of the compressor, a gas pipe valve provided in the gas pipe, an indoor leak detection sensor provided in the room and detecting leakage of the refrigerant, Indoor leak detection A controller that closes the gas pipe valve when the sensor detects leakage of the refrigerant, and closes the suction valve after the refrigerant on the indoor unit side is collected in the gas pipe via the liquid pipe It is.

また、この発明による冷凍サイクル装置の制御方法は、冷媒を圧縮する圧縮機、前記冷媒と室内の空気とを熱交換する室内熱交換器、冷媒を膨張する膨張弁および前記冷媒と室外の空気とを熱交換する室外熱交換器が配管で接続され、前記室内熱交換器は室内に設置される室内機に設けられ、前記圧縮機、前記膨張弁および前記室外熱交換器は室外に設置される室外機に設けられる冷凍サイクル装置の制御方法において、前記冷凍サイクル装置は、前記室内熱交換器と前記膨張弁との間を接続する配管である液管、前記圧縮機と前記室内熱交換器との間を接続する配管であり、前記液管より大きい流路断面積を有するガス管、前記圧縮機の吸入側の配管に設けられる吸入弁、前記ガス管に設けられるガス管弁、および前記室内に設けられ前記冷媒の漏洩を検知する室内漏洩検知センサを備え、前記制御装置は、前記室内漏洩検知センサが前記冷媒の漏洩を検知した場合に、前記ガス管弁を閉じ、前記室内機側の冷媒を前記液管を介して前記ガス管に回収した後に前記吸入弁を閉じるものである。   The control method of the refrigeration cycle apparatus according to the present invention includes a compressor that compresses a refrigerant, an indoor heat exchanger that exchanges heat between the refrigerant and indoor air, an expansion valve that expands the refrigerant, and the refrigerant and outdoor air. An outdoor heat exchanger for exchanging heat is connected by piping, the indoor heat exchanger is provided in an indoor unit installed indoors, and the compressor, the expansion valve, and the outdoor heat exchanger are installed outdoor. In the control method of the refrigeration cycle apparatus provided in the outdoor unit, the refrigeration cycle apparatus includes a liquid pipe that is a pipe connecting the indoor heat exchanger and the expansion valve, the compressor, and the indoor heat exchanger. A gas pipe having a larger flow passage cross-sectional area than the liquid pipe, a suction valve provided in a pipe on the suction side of the compressor, a gas pipe valve provided in the gas pipe, and the chamber Provided in the above An indoor leakage detection sensor for detecting a leakage of the medium, and the control device closes the gas pipe valve when the indoor leakage detection sensor detects the leakage of the refrigerant, and causes the refrigerant on the indoor unit side to pass through the liquid. The suction valve is closed after being collected in the gas pipe via a pipe.

この発明の冷凍サイクル装置および冷凍サイクル装置の制御方法によれば、冷媒の漏洩を検知したときに速やかに冷媒を回収できる。   According to the refrigeration cycle apparatus and the control method for the refrigeration cycle apparatus of the present invention, the refrigerant can be quickly recovered when the leakage of the refrigerant is detected.

この発明の実施の形態１による冷凍サイクル装置の構成を示す概略図である。It is the schematic which shows the structure of the refrigerating-cycle apparatus by Embodiment 1 of this invention. この発明の実施の形態２による冷凍サイクル装置の構成を示す概略図である。It is the schematic which shows the structure of the refrigerating-cycle apparatus by Embodiment 2 of this invention. この発明の実施の形態３による冷凍サイクル装置の構成を示す概略図である。It is the schematic which shows the structure of the refrigerating-cycle apparatus by Embodiment 3 of this invention. この発明の実施の形態４による冷凍サイクル装置の構成を示す概略図である。It is the schematic which shows the structure of the refrigerating-cycle apparatus by Embodiment 4 of this invention.

実施の形態１．
図１は、この発明の実施の形態１による冷凍サイクル装置の構成を示す概略図である。図において、同一の符号を付したものは、同一またはこれに相当するものであり、このことは、明細書の全文において共通することである。 Embodiment 1 FIG.
1 is a schematic diagram showing a configuration of a refrigeration cycle apparatus according to Embodiment 1 of the present invention. In the drawings, the same reference numerals are the same or equivalent, and this is common throughout the entire specification.

図１において、冷凍サイクル装置は、室内に設置される室内機１および室外に設置される室外機２を備えている。室内機１には、室内の空気と冷媒とを熱交換する室内熱交換器１０および室内熱交換器１０に室内の空気を送る室内ファン１１が設けられる。室外機２には、室外の空気と冷媒とを熱交換する室外熱交換器７、室外熱交換器７に室外の空気を送る室外ファン８、冷媒を圧縮する圧縮機５、冷媒を膨張する膨張弁９、および暖房運転と冷房運転とで流路を切り替える四方弁６が設けられる。図１の四方弁６において、実線は暖房運転の冷媒回路を示し、破線は冷房運転の冷媒回路を示す。   In FIG. 1, the refrigeration cycle apparatus includes an indoor unit 1 installed indoors and an outdoor unit 2 installed outdoor. The indoor unit 1 is provided with an indoor heat exchanger 10 that exchanges heat between indoor air and refrigerant, and an indoor fan 11 that sends indoor air to the indoor heat exchanger 10. The outdoor unit 2 includes an outdoor heat exchanger 7 that exchanges heat between the outdoor air and the refrigerant, an outdoor fan 8 that sends outdoor air to the outdoor heat exchanger 7, a compressor 5 that compresses the refrigerant, and an expansion that expands the refrigerant. A valve 9 and a four-way valve 6 for switching the flow path between heating operation and cooling operation are provided. In the four-way valve 6 of FIG. 1, a solid line indicates a refrigerant circuit for heating operation, and a broken line indicates a refrigerant circuit for cooling operation.

室内熱交換器１０、膨張弁９、室外熱交換器７、四方弁６および圧縮機５は、配管で接続され、冷媒回路を構成している。室内熱交換器１０と膨張弁９との間を接続する配管を液管４とし、室内熱交換器１０と圧縮機５との間を接続する配管をガス管３とし、冷媒回路の圧力損失を低減するためにガス管３の流路断面積（ここでは、直径）は、液管４の流路断面積（ここでは、直径）に比べて大きくなっている。また、冷凍サイクル装置は、ガス管３の途中に電磁開閉弁であるガス管弁１３を設け、圧縮機５の吸入側の配管に電磁開閉弁である吸入弁１４を設け、室内機１に冷媒の漏洩を検知する室内漏洩検知センサ１２を設けている。また、ガス管弁１３は、図１では室内機１側に設置しているが、回収する冷媒量に応じて必要な容積を確保できればよく、室内機１と室外機２との間に設けてもよい。また、通常運転中、ガス管弁１３および吸入弁１４は、開いた状態になっている。図１には示していないが、冷凍サイクル装置は、圧縮機５、四方弁６、ガス管弁１３、吸入弁１４、膨張弁９、室外ファン８、室内ファン１１および室内漏洩検知センサ１２に電気的に接続され、それぞれの機器を制御する制御装置を備えている。   The indoor heat exchanger 10, the expansion valve 9, the outdoor heat exchanger 7, the four-way valve 6 and the compressor 5 are connected by a pipe to constitute a refrigerant circuit. The pipe connecting the indoor heat exchanger 10 and the expansion valve 9 is the liquid pipe 4, the pipe connecting the indoor heat exchanger 10 and the compressor 5 is the gas pipe 3, and the pressure loss of the refrigerant circuit is reduced. In order to reduce, the cross-sectional area (here, the diameter) of the gas pipe 3 is larger than the cross-sectional area (here, the diameter) of the liquid pipe 4. In the refrigeration cycle apparatus, a gas pipe valve 13 that is an electromagnetic on-off valve is provided in the middle of the gas pipe 3, a suction valve 14 that is an electromagnetic on-off valve is provided on the suction side piping of the compressor 5, and the refrigerant is supplied to the indoor unit 1. An indoor leak detection sensor 12 is provided for detecting the leak. Further, although the gas pipe valve 13 is installed on the indoor unit 1 side in FIG. 1, it is sufficient if a necessary volume can be secured according to the amount of refrigerant to be recovered, and it is provided between the indoor unit 1 and the outdoor unit 2. Also good. Further, during normal operation, the gas pipe valve 13 and the suction valve 14 are open. Although not shown in FIG. 1, the refrigeration cycle apparatus is electrically connected to the compressor 5, the four-way valve 6, the gas pipe valve 13, the suction valve 14, the expansion valve 9, the outdoor fan 8, the indoor fan 11, and the indoor leakage detection sensor 12. And a control device for controlling each device.

図１に示す冷凍サイクル装置の通常時の運転動作について説明する。
まず、暖房運転の際の冷凍サイクル装置の動作について説明する。
圧縮機５で圧縮されたガス冷媒は、四方弁６を通り、実線で示すようにガス管３およびガス管弁１３を経由して、室内熱交換器１０に送られる。室内熱交換器１０に送られたガス冷媒は、空気と熱交換し、液化される。室内熱交換器１０で液化した冷媒は、液管４を経由して膨張弁９に送られ、膨張弁９で減圧される。膨張弁９で減圧され気液二相となった冷媒は、室外熱交換器７に送られ、空気と熱交換し、気化される。気化した冷媒は、四方弁６および吸入弁１４を通り圧縮機５に戻り、上記冷凍サイクルを繰り返す。 The normal operation of the refrigeration cycle apparatus shown in FIG. 1 will be described.
First, the operation of the refrigeration cycle apparatus during the heating operation will be described.
The gas refrigerant compressed by the compressor 5 passes through the four-way valve 6 and is sent to the indoor heat exchanger 10 via the gas pipe 3 and the gas pipe valve 13 as shown by a solid line. The gas refrigerant sent to the indoor heat exchanger 10 exchanges heat with air and is liquefied. The refrigerant liquefied by the indoor heat exchanger 10 is sent to the expansion valve 9 via the liquid pipe 4 and decompressed by the expansion valve 9. The refrigerant that has been depressurized by the expansion valve 9 to become a gas-liquid two-phase is sent to the outdoor heat exchanger 7 to exchange heat with air and to be vaporized. The vaporized refrigerant returns to the compressor 5 through the four-way valve 6 and the suction valve 14, and repeats the refrigeration cycle.

次に、冷房運転の際の冷凍サイクル装置の動作について説明する。
圧縮機５で圧縮されたガス冷媒は、四方弁６を通り、破線で示すように室外熱交換器７に送られる。室外熱交換器７に送られたガス冷媒は、空気と熱交換し、液化される。室外熱交換器７で液化した冷媒は、膨張弁９に送られ、膨張弁９で減圧される。膨張弁９で減圧され気液二相となった冷媒は、液管４を経由して室内熱交換器１０に送られ、空気と熱交換し、気化される。気化した冷媒は、ガス管弁１３、ガス管３および吸入弁１４を通り圧縮機５に戻り、上記冷凍サイクルを繰り返す。 Next, the operation of the refrigeration cycle apparatus during the cooling operation will be described.
The gas refrigerant compressed by the compressor 5 passes through the four-way valve 6 and is sent to the outdoor heat exchanger 7 as indicated by a broken line. The gas refrigerant sent to the outdoor heat exchanger 7 exchanges heat with air and is liquefied. The refrigerant liquefied by the outdoor heat exchanger 7 is sent to the expansion valve 9 and decompressed by the expansion valve 9. The refrigerant that has been depressurized by the expansion valve 9 to become a gas-liquid two-phase is sent to the indoor heat exchanger 10 via the liquid pipe 4, exchanges heat with air, and is evaporated. The vaporized refrigerant returns to the compressor 5 through the gas pipe valve 13, the gas pipe 3, and the suction valve 14, and repeats the refrigeration cycle.

以上に示すとおり、暖房運転の際には、室内熱交換器１０の膨張弁９側から液管４内に液冷媒が存在している。また、冷房運転の際には、室内熱交換器１０の膨張弁９側から液管４内に気液二相となった冷媒が存在している。一方、ガス管３には、暖房運転および冷房運転のいずれの場合もガス冷媒が存在しており、冷媒の物質量としては、暖房運転および冷房運転のいずれの場合もガス管３よりも液管４の方に多くの冷媒が存在している。   As described above, during the heating operation, liquid refrigerant exists in the liquid pipe 4 from the expansion valve 9 side of the indoor heat exchanger 10. Further, during the cooling operation, the refrigerant that has become a gas-liquid two-phase exists in the liquid pipe 4 from the expansion valve 9 side of the indoor heat exchanger 10. On the other hand, gas refrigerant is present in the gas pipe 3 in both the heating operation and the cooling operation, and the amount of refrigerant is more liquid than the gas pipe 3 in both the heating operation and the cooling operation. There are many refrigerants in the direction of 4.

室内漏洩検知センサ１２が冷媒の漏洩を検知した場合の冷凍サイクル装置の動作について、以下に説明する。
（１−１）暖房運転の際、室内漏洩検知センサ１２が冷媒の漏洩を検知した場合
室内機１に設置された室内漏洩検知センサ１２によって冷媒の漏洩が検知されると、制御装置は、ガス管弁１３を閉として膨張弁９を全開とする。暖房運転の際に、室内熱交換器１０の下流から液管４内に存在している液冷媒は、膨張弁９、室外熱交換器７、吸入弁１４および圧縮機５を通り、ガス管３に移動する。室内機１側の冷媒を液管４を介してガス管３に回収し、制御装置が、圧縮機５の吸入側に設けられた圧力計からの信号によって、圧縮機５の吸入圧力が所定の値より低くなったと判断した場合、吸入弁１４を閉とする。以上により、吸入弁１４の四方弁６側からガス管弁１３の室内熱交換器１０までの間（吸入弁１４−四方弁６−室外熱交換器７−膨張弁９−室内熱交換器１０−ガス管弁１３の間）の冷媒のほとんどがガス管弁１３と吸入弁１４との間に移動し、冷媒がガス管弁１３と吸入弁１４との間、すなわちガス管３を主とする部分に回収される。 The operation of the refrigeration cycle apparatus when the indoor leakage detection sensor 12 detects refrigerant leakage will be described below.
(1-1) When the indoor leakage detection sensor 12 detects refrigerant leakage during heating operation When the refrigerant leakage is detected by the indoor leakage detection sensor 12 installed in the indoor unit 1, the control device The pipe valve 13 is closed and the expansion valve 9 is fully opened. During the heating operation, the liquid refrigerant present in the liquid pipe 4 from the downstream of the indoor heat exchanger 10 passes through the expansion valve 9, the outdoor heat exchanger 7, the suction valve 14 and the compressor 5, and passes through the gas pipe 3. Move to. The refrigerant on the indoor unit 1 side is collected in the gas pipe 3 via the liquid pipe 4, and the control device determines the suction pressure of the compressor 5 based on a signal from a pressure gauge provided on the suction side of the compressor 5. If it is determined that the value is lower than the value, the intake valve 14 is closed. As described above, from the four-way valve 6 side of the suction valve 14 to the indoor heat exchanger 10 of the gas pipe valve 13 (suction valve 14-four-way valve 6-outdoor heat exchanger 7-expansion valve 9-indoor heat exchanger 10- Most of the refrigerant between the gas pipe valve 13) moves between the gas pipe valve 13 and the suction valve 14, and the refrigerant is between the gas pipe valve 13 and the suction valve 14, that is, the part mainly composed of the gas pipe 3. To be recovered.

（１−２）冷房運転の際、室内漏洩検知センサ１２が冷媒の漏洩を検知した場合
室内機１に設置された室内漏洩検知センサ１２によって冷媒の漏洩が検知されると、制御装置は、圧縮機５を停止しガス管弁１３を閉とした後、四方弁６を暖房運転に切り替えて膨張弁９を全開にし、圧縮機５を運転する。冷房運転の際に、室内熱交換器１０の下流から液管４内に存在している気液二相の冷媒は、膨張弁９、室外熱交換器７、吸入弁１４および圧縮機５を通り、ガス管３に移動する。室内機１側の冷媒を液管４を介してガス管３に回収し、制御装置が、圧縮機５の吸入側に設けられた圧力計からの信号によって、圧縮機５の吸入圧力が所定の値より低くなったと判断した場合、吸入弁１４を閉とする。以上により、吸入弁１４の四方弁６側からガス管弁１３の室内熱交換器１０までの間（吸入弁１４−四方弁６−室外熱交換器７−膨張弁９−室内熱交換器１０−ガス管弁１３の間）の冷媒のほとんどがガス管弁１３と吸入弁１４との間に移動し、冷媒がガス管弁１３と吸入側電磁弁１４との間、すなわちガス管３を主とする部分に回収される。なお、圧縮機５を一旦停止したが、圧縮機５を停止せず、四方弁６を暖房運転に切り替えるだけでもよい。 (1-2) When the indoor leakage detection sensor 12 detects the leakage of the refrigerant during the cooling operation When the leakage of the refrigerant is detected by the indoor leakage detection sensor 12 installed in the indoor unit 1, the control device compresses the refrigerant. After the machine 5 is stopped and the gas pipe valve 13 is closed, the four-way valve 6 is switched to the heating operation, the expansion valve 9 is fully opened, and the compressor 5 is operated. During the cooling operation, the gas-liquid two-phase refrigerant present in the liquid pipe 4 from the downstream of the indoor heat exchanger 10 passes through the expansion valve 9, the outdoor heat exchanger 7, the suction valve 14, and the compressor 5. To the gas pipe 3. The refrigerant on the indoor unit 1 side is collected in the gas pipe 3 via the liquid pipe 4, and the control device determines the suction pressure of the compressor 5 based on a signal from a pressure gauge provided on the suction side of the compressor 5. If it is determined that the value is lower than the value, the intake valve 14 is closed. As described above, from the four-way valve 6 side of the suction valve 14 to the indoor heat exchanger 10 of the gas pipe valve 13 (suction valve 14-four-way valve 6-outdoor heat exchanger 7-expansion valve 9-indoor heat exchanger 10- Most of the refrigerant between the gas pipe valve 13 and the suction valve 14 moves between the gas pipe valve 13 and the suction side electromagnetic valve 14, that is, the gas pipe 3 is mainly used. It is collected in the part to be. In addition, although the compressor 5 was once stopped, you may just switch the four-way valve 6 to heating operation, without stopping the compressor 5. FIG.

本実施の形態に示す冷凍サイクル装置およびその制御方法では、液管４内に存在している液冷媒または気液二相の冷媒が膨張弁９を介してガス管３側に速やかに移動するので、室内機１の冷媒を速やかにガス管３に回収できる。したがって、ガス管３側に存在するガス冷媒よりも物質量の多い液管４側に存在する冷媒を速やかに回収できるので、回収動作中の漏洩冷媒量も低減できる効果もある。さらに、本実施の形態に示す冷凍サイクル装置およびその制御方法では、冷媒を液管４よりも流路断面積の大きいガス管３側に回収するため、より多くの冷媒をガス管３に回収することが可能である。
また、本実施の形態では、冷凍サイクル装置は、Ｒ４１０Ａ等の暖房運転の際に室内熱交換器１０（冷房運転の際に室外熱交換器７）で凝縮液化する冷媒を使用するとして記載した。二酸化炭素などの凝縮液化せずに超臨界状態となる冷媒でも、本実施の形態に示す冷凍サイクル装置は、ガス管３側に存在するガス冷媒よりも物質量の多い液管４側に存在する冷媒を速やかに回収できるので回収動作中の漏洩冷媒量も低減できる効果がある。 In the refrigeration cycle apparatus and its control method shown in the present embodiment, the liquid refrigerant or the gas-liquid two-phase refrigerant existing in the liquid pipe 4 quickly moves to the gas pipe 3 side through the expansion valve 9. The refrigerant of the indoor unit 1 can be quickly collected in the gas pipe 3. Therefore, since the refrigerant existing on the liquid pipe 4 side having a larger amount of material than the gas refrigerant existing on the gas pipe 3 side can be recovered quickly, the leakage refrigerant amount during the recovery operation can also be reduced. Furthermore, in the refrigeration cycle apparatus and the control method thereof shown in the present embodiment, the refrigerant is recovered to the gas pipe 3 side having a larger flow path cross-sectional area than the liquid pipe 4, so that more refrigerant is recovered to the gas pipe 3. It is possible.
In the present embodiment, the refrigeration cycle apparatus is described as using a refrigerant that condenses and liquefies in the indoor heat exchanger 10 (the outdoor heat exchanger 7 in the cooling operation) during the heating operation such as R410A. Even in a refrigerant that is in a supercritical state without being liquefied, such as carbon dioxide, the refrigeration cycle apparatus shown in the present embodiment is present on the liquid pipe 4 side having a larger amount of material than the gas refrigerant present on the gas pipe 3 side. Since the refrigerant can be collected quickly, there is an effect of reducing the amount of refrigerant leaked during the collecting operation.

なお、本実施の形態では、圧縮機５の吸入側に設けられた圧力計からの信号によって、圧縮機５の吸入圧力に基づいて冷媒の回収等を判断したが、事前に実験で圧縮機５の吸入圧力が第１の所定値または第２の所定値になるまでの時間を測定し、当該所定の時間を経過した場合に、冷媒の回収等を判断してもよい。
また、本実施の形態では、四方弁６を設け、冷房運転と暖房運転とを切り替える冷凍サイクル装置を示したが、四方弁を設けずに暖房運転のみを行う冷凍サイクル装置においても、同様の構成および動作によって、本実施の形態に示す冷凍サイクル装置と同様の効果を奏する。 In the present embodiment, the recovery of the refrigerant or the like is determined based on the suction pressure of the compressor 5 based on the signal from the pressure gauge provided on the suction side of the compressor 5. The time until the suction pressure reaches the first predetermined value or the second predetermined value may be measured, and when the predetermined time has elapsed, recovery of the refrigerant or the like may be determined.
Further, in the present embodiment, the four-way valve 6 is provided and the refrigeration cycle apparatus that switches between the cooling operation and the heating operation is shown. However, the same configuration is applied to the refrigeration cycle apparatus that performs only the heating operation without providing the four-way valve. And by the operation, the same effect as the refrigeration cycle apparatus shown in the present embodiment can be obtained.

実施の形態２．
図２は、この発明の実施の形態２による冷凍サイクル装置の構成を示す概略図である。本実施の形態に示す冷凍サイクル装置は、室外機２にも制御装置に電気的に接続された室外漏洩検知センサ２２を設けており、その他の構成および機能は、実施の形態１に示す冷凍サイクル装置と同様である。したがって、この実施の形態２による冷凍サイクル装置の通常時の運転動作は、実施の形態１に示す冷凍サイクル装置と同様である。
室内漏洩検知センサ１２および室外漏洩検知センサ２２の両方が冷媒の漏洩を検知した場合の冷凍サイクル装置の動作について、以下に説明する。なお、室内漏洩検知センサ１２のみが冷媒の漏洩を検知した場合の冷凍サイクル装置の動作は、実施の形態１に示した冷凍サイクル装置の動作と同様である。 Embodiment 2. FIG.
FIG. 2 is a schematic diagram showing a configuration of a refrigeration cycle apparatus according to Embodiment 2 of the present invention. In the refrigeration cycle apparatus shown in the present embodiment, the outdoor unit 2 is also provided with the outdoor leakage detection sensor 22 electrically connected to the control device, and the other configurations and functions are the refrigeration cycle shown in the first embodiment. It is the same as the device. Therefore, the normal operation of the refrigeration cycle apparatus according to the second embodiment is the same as that of the refrigeration cycle apparatus shown in the first embodiment.
The operation of the refrigeration cycle apparatus when both the indoor leakage detection sensor 12 and the outdoor leakage detection sensor 22 detect refrigerant leakage will be described below. Note that the operation of the refrigeration cycle apparatus when only the indoor leakage detection sensor 12 detects the leakage of the refrigerant is the same as the operation of the refrigeration cycle apparatus shown in the first embodiment.

（２−１）暖房運転の際、室内漏洩検知センサ１２および室外漏洩検知センサ２２の両方が冷媒の漏洩を検知した場合
室内機１に設置された室内漏洩検知センサ１２および室外機２に設置された室外漏洩検知センサ２２によって冷媒の漏洩が検知されると、制御装置は、ガス管弁１３を閉として膨張弁９を全開とする。暖房運転の際には、室内熱交換器１０の下流から液管４内に存在している液冷媒は、膨張弁９、室外熱交換器７、吸入弁１４および圧縮機５を通り、ガス管３に移動する。室内機１側の冷媒を液管４を介してガス管３に回収し、制御装置が、圧縮機５の吸入側に設けられた圧力計からの信号によって、圧縮機５の吸入圧力が所定の値より低くなったと判断した場合、吸入弁１４を閉とする。以上により、吸入弁１４の四方弁６側からガス管弁１３の室内熱交換器１０までの間（吸入弁１４−四方弁６−室外熱交換器７−膨張弁９−室内熱交換器１０−ガス管弁１３の間）の冷媒のほとんどがガス管弁１３と吸入弁１４との間に移動し、冷媒がガス管弁１３と吸入弁１４との間、すなわちガス管３を主とする部分に回収される。
なお、暖房運転の際、室外漏洩検知センサ２２のみが冷媒の漏洩を検知した場合でも、上記動作で冷媒を回収できる。 (2-1) When the indoor leakage detection sensor 12 and the outdoor leakage detection sensor 22 both detect refrigerant leakage during heating operation, the indoor leakage detection sensor 12 installed in the indoor unit 1 and the outdoor unit 2 are installed. When the leakage of the refrigerant is detected by the outdoor leakage detection sensor 22, the control device closes the gas pipe valve 13 and fully opens the expansion valve 9. During the heating operation, the liquid refrigerant present in the liquid pipe 4 from the downstream of the indoor heat exchanger 10 passes through the expansion valve 9, the outdoor heat exchanger 7, the suction valve 14 and the compressor 5, and passes through the gas pipe. Move to 3. The refrigerant on the indoor unit 1 side is collected in the gas pipe 3 via the liquid pipe 4, and the control device determines the suction pressure of the compressor 5 based on a signal from a pressure gauge provided on the suction side of the compressor 5. If it is determined that the value is lower than the value, the intake valve 14 is closed. As described above, from the four-way valve 6 side of the suction valve 14 to the indoor heat exchanger 10 of the gas pipe valve 13 (suction valve 14-four-way valve 6-outdoor heat exchanger 7-expansion valve 9-indoor heat exchanger 10- Most of the refrigerant between the gas pipe valve 13) moves between the gas pipe valve 13 and the suction valve 14, and the refrigerant is between the gas pipe valve 13 and the suction valve 14, that is, the part mainly composed of the gas pipe 3. To be recovered.
In the heating operation, the refrigerant can be recovered by the above operation even when only the outdoor leak detection sensor 22 detects the refrigerant leak.

（２−２）冷房運転の際、室内漏洩検知センサ１２および室外漏洩検知センサ２２の両方が冷媒の漏洩を検知した場合
室内機１に設置された室内漏洩検知センサ１２および室外機２に設置された室外漏洩検知センサ２２によって冷媒の漏洩が検知されると、制御装置は、圧縮機５を停止しガス管弁１３を閉とした後、四方弁６を暖房運転に切り替えて膨張弁９を全開にし、圧縮機５を運転する。冷房運転の際に、室内熱交換器１０の下流から液管４内に存在している気液二相の冷媒は、膨張弁９、室外熱交換器７、吸入弁１４および圧縮機５を通り、ガス管３に移動する。室内機１側の冷媒を液管４を介してガス管３に回収し、制御装置が、圧縮機５の吸入側に設けられた圧力計からの信号によって、圧縮機５の吸入圧力が所定の値より低くなったと判断した場合、吸入弁１４を閉とする。以上により、吸入弁１４の四方弁６側からガス管弁１３の室内熱交換器１０までの間（吸入弁１４−四方弁６−室外熱交換器７−膨張弁９−室内熱交換器１０−ガス管弁１３の間）の冷媒のほとんどがガス管弁１３と吸入弁１４との間に移動し、冷媒がガス管弁１３と吸入弁１４との間、すなわちガス管３を主とする部分に回収される。なお、圧縮機５を一旦停止したが、圧縮機５を停止せず、四方弁６を暖房運転に切り替えるだけでもよい。
なお、冷房運転の際、室外漏洩検知センサ２２のみが冷媒の漏洩を検知した場合でも、上記動作で冷媒を回収できる。 (2-2) When cooling operation is performed, both the indoor leakage detection sensor 12 and the outdoor leakage detection sensor 22 detect refrigerant leakage. The indoor leakage detection sensor 12 installed in the indoor unit 1 and the outdoor unit 2 are installed. When the leakage of the refrigerant is detected by the outdoor leakage detection sensor 22, the control device stops the compressor 5 and closes the gas pipe valve 13, then switches the four-way valve 6 to the heating operation and fully opens the expansion valve 9. And the compressor 5 is operated. During the cooling operation, the gas-liquid two-phase refrigerant present in the liquid pipe 4 from the downstream of the indoor heat exchanger 10 passes through the expansion valve 9, the outdoor heat exchanger 7, the suction valve 14, and the compressor 5. To the gas pipe 3. The refrigerant on the indoor unit 1 side is collected in the gas pipe 3 via the liquid pipe 4, and the control device determines the suction pressure of the compressor 5 based on a signal from a pressure gauge provided on the suction side of the compressor 5. If it is determined that the value is lower than the value, the intake valve 14 is closed. As described above, from the four-way valve 6 side of the suction valve 14 to the indoor heat exchanger 10 of the gas pipe valve 13 (suction valve 14-four-way valve 6-outdoor heat exchanger 7-expansion valve 9-indoor heat exchanger 10- Most of the refrigerant between the gas pipe valve 13) moves between the gas pipe valve 13 and the suction valve 14, and the refrigerant is between the gas pipe valve 13 and the suction valve 14, that is, the part mainly composed of the gas pipe 3. To be recovered. In addition, although the compressor 5 was once stopped, you may just switch the four-way valve 6 to heating operation, without stopping the compressor 5. FIG.
In the cooling operation, even when only the outdoor leakage detection sensor 22 detects the leakage of the refrigerant, the refrigerant can be collected by the above operation.

本実施の形態に示す冷凍サイクル装置およびその制御方法では、実施の形態１に示す冷凍サイクル装置およびその制御方法と同様の効果がある。また、本実施の形態に示す冷凍サイクル装置およびその制御方法では、室内漏洩検知センサ１２と室外漏洩検知センサ２２との両方が冷媒の漏洩を検知した場合、および室外漏洩検知センサ２２のみが冷媒の漏洩を検知した場合でも、液管４内に存在している液冷媒が膨張弁９を介してガス管３側に速やかに移動するので、室内漏洩検知センサ１２と室外漏洩検知センサ２２との両方が冷媒の漏洩を検知した場合、および室外漏洩検知センサ２２のみが冷媒の漏洩を検知した場合でも、室内機１の冷媒を速やかにガス管３に回収できる。また、本実施の形態に示す冷凍サイクル装置およびその制御方法では、ガス管３側に存在するガス冷媒よりも物質量の多い液管４側に存在する冷媒を速やかに回収できるので、回収動作中の漏洩冷媒量も低減できる効果もある。さらに、本実施の形態に示す冷凍サイクル装置およびその制御方法では、室内漏洩検知センサ１２と室外漏洩検知センサ２２との両方が冷媒の漏洩を検知した場合、および室外漏洩検知センサ２２のみが冷媒の漏洩を検知した場合でも、冷媒を液管４よりも流路断面積の大きいガス管３側に回収するため、より多くの冷媒をガス管３に回収することが可能である。   The refrigeration cycle apparatus and its control method shown in the present embodiment have the same effects as the refrigeration cycle apparatus and its control method shown in the first embodiment. Further, in the refrigeration cycle apparatus and the control method thereof shown in the present embodiment, when both the indoor leakage detection sensor 12 and the outdoor leakage detection sensor 22 detect the leakage of the refrigerant, only the outdoor leakage detection sensor 22 has the refrigerant. Even when a leak is detected, the liquid refrigerant present in the liquid pipe 4 quickly moves to the gas pipe 3 side via the expansion valve 9, so that both the indoor leak detection sensor 12 and the outdoor leak detection sensor 22 When the refrigerant leak is detected and only the outdoor leak detection sensor 22 detects the refrigerant leak, the refrigerant of the indoor unit 1 can be quickly collected in the gas pipe 3. Further, in the refrigeration cycle apparatus and the control method thereof shown in the present embodiment, the refrigerant present on the liquid pipe 4 side having a larger amount of material than the gas refrigerant present on the gas pipe 3 side can be quickly recovered, so that the recovery operation is being performed. This also has the effect of reducing the amount of leakage refrigerant. Furthermore, in the refrigeration cycle apparatus and its control method shown in the present embodiment, when both the indoor leakage detection sensor 12 and the outdoor leakage detection sensor 22 detect the leakage of the refrigerant, and only the outdoor leakage detection sensor 22 is the refrigerant. Even when leakage is detected, the refrigerant is recovered to the gas pipe 3 side having a larger flow path cross-sectional area than the liquid pipe 4, so that more refrigerant can be recovered to the gas pipe 3.

実施の形態３．
図３は、この発明の実施の形態３による冷凍サイクル装置の構成を示す概略図である。本実施の形態３に示す冷凍サイクル装置では、圧縮機５の吸入側の配管と液管４とを接続するバイパス管１６を設け、このバイパス管１６にバイパス弁１７を設けている。その他の構成および機能は、実施の形態１に示す冷凍サイクル装置と同様である。 Embodiment 3 FIG.
FIG. 3 is a schematic diagram showing a configuration of a refrigeration cycle apparatus according to Embodiment 3 of the present invention. In the refrigeration cycle apparatus shown in the third embodiment, a bypass pipe 16 that connects a pipe on the suction side of the compressor 5 and the liquid pipe 4 is provided, and a bypass valve 17 is provided in the bypass pipe 16. Other configurations and functions are the same as those of the refrigeration cycle apparatus shown in the first embodiment.

図３において、冷凍サイクル装置は、圧縮機５の吸入側であって圧縮機５と吸入弁１４との間の配管と室内機１内の液管４とを接続するバイパス管１６を備え、バイパス管１６に電磁弁であるバイパス弁１７が設けられている。このバイパス弁１７は、図示しない制御装置と電気的に接続され、この制御装置に制御されている。
図３に示す冷凍サイクル装置の運転動作について説明する。
バイパス電磁弁１７は、通常時の運転中は閉となっており、この実施の形態３による冷凍サイクル装置の通常時の運転動作は、実施の形態１に示す冷凍サイクル装置の通常時の運転動作と同様である。
室内漏洩検知センサ１２が冷媒の漏洩を検知した場合の冷凍サイクル装置の動作について、以下に説明する。 In FIG. 3, the refrigeration cycle apparatus includes a bypass pipe 16 that connects the pipe between the compressor 5 and the suction valve 14 and the liquid pipe 4 in the indoor unit 1 on the suction side of the compressor 5. The pipe 16 is provided with a bypass valve 17 which is an electromagnetic valve. The bypass valve 17 is electrically connected to and controlled by a control device (not shown).
The operation of the refrigeration cycle apparatus shown in FIG. 3 will be described.
The bypass solenoid valve 17 is closed during normal operation. The normal operation of the refrigeration cycle apparatus according to the third embodiment is the normal operation of the refrigeration cycle apparatus shown in the first embodiment. It is the same.
The operation of the refrigeration cycle apparatus when the indoor leakage detection sensor 12 detects refrigerant leakage will be described below.

（３−１）暖房運転の際、室内漏洩検知センサ１２が冷媒の漏洩を検知した場合
室内機１に設置された室内漏洩検知センサ１２によって冷媒の漏洩が検知されると、制御装置は、ガス管弁１３を閉としてバイパス弁１７を開とする。暖房運転の際には、室内熱交換器１０の下流から液管４内に存在している液冷媒は、バイパス弁１７を設けたバイパス管１６および圧縮機５を通り、ガス管３に移動する。また、吸入弁１４から膨張弁９までの配管に存在している冷媒は、吸入弁１４を介してもガス管３に移動する。室内機１側の冷媒を液管４を介してガス管３に回収し、制御装置が、圧縮機５の吸入側に設けられた圧力計からの信号によって、圧縮機５の吸入圧力が第１の所定値より低くなったと判断した場合、バイパス弁１７および吸入弁１４を閉とする。以上により、吸入弁１４の四方弁６側からガス管弁１３の室内熱交換器１０までの間（吸入弁１４−四方弁６−室外熱交換器７−膨張弁９−室内熱交換器１０−ガス管弁１３の間）の冷媒のほとんどがガス管弁１３と吸入弁１４との間に移動し、冷媒がガス管弁１３と吸入弁１４との間、すなわちガス管３を主とする部分に回収される。 (3-1) When the indoor leakage detection sensor 12 detects the leakage of the refrigerant during the heating operation When the leakage of the refrigerant is detected by the indoor leakage detection sensor 12 installed in the indoor unit 1, the control device The pipe valve 13 is closed and the bypass valve 17 is opened. During the heating operation, the liquid refrigerant present in the liquid pipe 4 from the downstream of the indoor heat exchanger 10 passes through the bypass pipe 16 provided with the bypass valve 17 and the compressor 5 and moves to the gas pipe 3. . The refrigerant existing in the pipe from the intake valve 14 to the expansion valve 9 also moves to the gas pipe 3 through the intake valve 14. The refrigerant on the indoor unit 1 side is collected in the gas pipe 3 via the liquid pipe 4, and the control device determines the suction pressure of the compressor 5 based on the signal from the pressure gauge provided on the suction side of the compressor 5. When it is determined that the value is lower than the predetermined value, the bypass valve 17 and the intake valve 14 are closed. As described above, from the four-way valve 6 side of the suction valve 14 to the indoor heat exchanger 10 of the gas pipe valve 13 (suction valve 14-four-way valve 6-outdoor heat exchanger 7-expansion valve 9-indoor heat exchanger 10- Most of the refrigerant between the gas pipe valve 13) moves between the gas pipe valve 13 and the suction valve 14, and the refrigerant is between the gas pipe valve 13 and the suction valve 14, that is, the part mainly composed of the gas pipe 3. To be recovered.

（３−２）冷房運転の際、室内漏洩検知センサ１２が冷媒の漏洩を検知した場合
室内機１に設置された室内漏洩検知センサ１２によって冷媒の漏洩が検知されると、制御装置は、圧縮機５を停止しガス管弁１３を閉、バイパス弁１７を開とし、膨張弁９を全開とする。冷房運転の際に、室外熱交換器７の下流から膨張弁９に存在している液冷媒は、圧力差によって膨張弁９とバイパス弁１７を設けたバイパス管１６とを介して圧縮機５の吸入側に速やかに移動する。制御装置は、圧縮機５の吸入側に設けられた圧力計からの信号によって、圧縮機５の吸入圧力が第２の所定の値より高くなったと判断した場合、四方弁６を暖房運転に切り替えて圧縮機５を運転する。なお、圧縮機５を一旦停止したが、圧縮機５を停止せず、四方弁６を暖房運転に切り替えるだけでもよい。 (3-2) When the indoor leakage detection sensor 12 detects the leakage of the refrigerant during the cooling operation When the leakage of the refrigerant is detected by the indoor leakage detection sensor 12 installed in the indoor unit 1, the control device compresses the refrigerant. The machine 5 is stopped, the gas pipe valve 13 is closed, the bypass valve 17 is opened, and the expansion valve 9 is fully opened. During the cooling operation, the liquid refrigerant present in the expansion valve 9 from the downstream side of the outdoor heat exchanger 7 passes through the expansion valve 9 and the bypass pipe 16 provided with the bypass valve 17 due to the pressure difference. Move quickly to the inhalation side. When the control device determines that the suction pressure of the compressor 5 has become higher than the second predetermined value based on a signal from a pressure gauge provided on the suction side of the compressor 5, the control device switches the four-way valve 6 to the heating operation. Then, the compressor 5 is operated. In addition, although the compressor 5 was once stopped, you may just switch the four-way valve 6 to heating operation, without stopping the compressor 5. FIG.

室内機１側の冷媒を液管４を介してガス管３に回収し、制御装置が、圧縮機５の吸入側に設けられた圧力計からの信号によって、圧縮機５の吸入圧力が第１の所定値より低くなったと判断した場合、バイパス弁１７と吸入弁１４とを閉とする。以上により、吸入弁１４の四方弁６側からガス管弁１３の室内熱交換器１０までの間（吸入弁１４−四方弁６−室外熱交換器７−膨張弁９−室内熱交換器１０−ガス管弁１３の間）の冷媒のほとんどがガス管弁１３と吸入弁１４との間に移動し、冷媒がガス管弁１３と吸入弁１４との間、すなわちガス管３を主とする部分に回収される。   The refrigerant on the indoor unit 1 side is collected in the gas pipe 3 via the liquid pipe 4, and the control device determines the suction pressure of the compressor 5 based on the signal from the pressure gauge provided on the suction side of the compressor 5. When it is determined that the value is lower than the predetermined value, the bypass valve 17 and the intake valve 14 are closed. As described above, from the four-way valve 6 side of the suction valve 14 to the indoor heat exchanger 10 of the gas pipe valve 13 (suction valve 14-four-way valve 6-outdoor heat exchanger 7-expansion valve 9-indoor heat exchanger 10- Most of the refrigerant between the gas pipe valve 13) moves between the gas pipe valve 13 and the suction valve 14, and the refrigerant is between the gas pipe valve 13 and the suction valve 14, that is, the part mainly composed of the gas pipe 3. To be recovered.

本実施の形態に示す冷凍サイクル装置およびその制御方法では、暖房運転の際に室内熱交換器１０の下流から液管４内に存在している液冷媒がバイパス管１６を介してガス管３側に速やかに移動するので、実施の形態１に示す冷凍サイクル装置およびその制御方法よりも室内機１の冷媒を速やかに回収できる。したがって、ガス管３側に存在するガス冷媒よりも物質量の多い液管４側に存在する冷媒を速やかに回収できるので、回収動作中の漏洩冷媒量も低減できる効果もある。また、本実施の形態に示す冷凍サイクル装置およびその制御方法では、冷房運転の際に室外熱交換器７の下流から膨張弁９内に存在している液冷媒がバイパス電磁弁１７を介してガス管３側に速やかに移動するので、実施の形態１に示す冷凍サイクル装置およびその制御方法よりも室外機２の冷媒を速やかに回収できる。したがって、ガス管３側に存在するガス冷媒よりも物質量の多い液管４側に存在する冷媒をより速やかに回収できるので、回収動作中の漏洩冷媒量もより低減できる効果もある。さらに、本実施の形態に示す冷凍サイクル装置およびその制御方法では、冷媒を液管４よりも流路断面積の大きいガス管３側に回収するため、より多くの冷媒をガス管３に回収することが可能である。   In the refrigeration cycle apparatus and the control method thereof shown in the present embodiment, the liquid refrigerant existing in the liquid pipe 4 from the downstream of the indoor heat exchanger 10 during the heating operation passes through the bypass pipe 16 to the gas pipe 3 side. Therefore, the refrigerant of the indoor unit 1 can be recovered more quickly than the refrigeration cycle apparatus and its control method shown in the first embodiment. Therefore, since the refrigerant existing on the liquid pipe 4 side having a larger amount of material than the gas refrigerant existing on the gas pipe 3 side can be recovered quickly, the leakage refrigerant amount during the recovery operation can also be reduced. Further, in the refrigeration cycle apparatus and the control method thereof shown in the present embodiment, the liquid refrigerant present in the expansion valve 9 from the downstream of the outdoor heat exchanger 7 during the cooling operation is passed through the bypass electromagnetic valve 17. Since it moves to the pipe 3 side quickly, the refrigerant of the outdoor unit 2 can be recovered more quickly than the refrigeration cycle apparatus and its control method shown in the first embodiment. Accordingly, the refrigerant present on the liquid pipe 4 side having a larger amount of substance than the gas refrigerant present on the gas pipe 3 side can be collected more quickly, and the amount of leaked refrigerant during the collecting operation can also be reduced. Furthermore, in the refrigeration cycle apparatus and the control method thereof shown in the present embodiment, the refrigerant is recovered to the gas pipe 3 side having a larger flow path cross-sectional area than the liquid pipe 4, so that more refrigerant is recovered to the gas pipe 3. It is possible.

なお、本実施の形態では、圧縮機５の吸入側に設けられた圧力計からの信号によって、圧縮機５の吸入圧力に基づいて冷媒の回収等を判断したが、事前に実験で圧縮機５の吸入圧力が第１の所定値または第２の所定値になるまでの時間を測定し、当該所定の時間を経過した場合に、冷媒の回収等を判断してもよい。また、圧縮機５の吸入圧力が第１の所定値および第２の所定値は、同じ値であってもよいし、異なる値であってもよい。さらに、冷媒の回収等を一方は圧力計からの信号によって判断し、他方は所定の時間の経過によって判断してもよい。   In the present embodiment, the recovery of the refrigerant or the like is determined based on the suction pressure of the compressor 5 based on the signal from the pressure gauge provided on the suction side of the compressor 5. The time until the suction pressure reaches the first predetermined value or the second predetermined value may be measured, and when the predetermined time has elapsed, recovery of the refrigerant or the like may be determined. Further, the first predetermined value and the second predetermined value of the suction pressure of the compressor 5 may be the same value or different values. Furthermore, one of the refrigerant recovery and the like may be determined by a signal from a pressure gauge, and the other may be determined by elapse of a predetermined time.

実施の形態４．
図４は、この発明の実施の形態４による冷凍サイクル装置の構成を示す概略図である。本実施の形態に示す冷凍サイクル装置は、室外機２にも制御装置に電気的に接続された室外漏洩検知センサ２２を設けており、その他の構成および機能は、実施の形態３に示す冷凍サイクル装置と同様である。
図４に示す冷凍サイクル装置の運転動作について説明する。
バイパス電磁弁１７は、通常時の運転中は閉となっており、冷凍サイクル装置の通常時の運転動作は、実施の形態１に示す冷凍サイクル装置の通常時の運転動作と同様である。
室内漏洩検知センサ１２および室外漏洩検知センサ２２の両方が冷媒の漏洩を検知した場合の冷凍サイクル装置の動作について、以下に説明する。なお、室内漏洩検知センサ１２のみが冷媒の漏洩を検知した場合の冷凍サイクル装置の動作は、実施の形態３に示した冷凍サイクル装置の動作と同様である。 Embodiment 4 FIG.
FIG. 4 is a schematic diagram showing the configuration of a refrigeration cycle apparatus according to Embodiment 4 of the present invention. In the refrigeration cycle apparatus shown in the present embodiment, the outdoor unit 2 is also provided with an outdoor leakage detection sensor 22 electrically connected to the control device, and the other configurations and functions are the refrigeration cycle shown in the third embodiment. It is the same as the device.
The operation of the refrigeration cycle apparatus shown in FIG. 4 will be described.
The bypass solenoid valve 17 is closed during normal operation, and the normal operation of the refrigeration cycle apparatus is the same as the normal operation of the refrigeration cycle apparatus shown in the first embodiment.
The operation of the refrigeration cycle apparatus when both the indoor leakage detection sensor 12 and the outdoor leakage detection sensor 22 detect refrigerant leakage will be described below. Note that the operation of the refrigeration cycle apparatus when only the indoor leakage detection sensor 12 detects refrigerant leakage is the same as the operation of the refrigeration cycle apparatus shown in the third embodiment.

（４−１）暖房運転の際に、室内漏洩検知センサ１２および室外漏洩検知センサ２２の両方が冷媒の漏洩を検知した場合
室内機１に設置された室内漏洩検知センサ１２および室外機２に設置された室外漏洩検知センサ２２によって冷媒の漏洩が検知されると、制御装置は、ガス管弁１３を閉としてバイパス電磁弁１７を開とする。暖房運転の際には、室内熱交換器１０の下流から液管４内に存在している液冷媒は、バイパス弁１７および圧縮機５を通り、ガス管３に移動する。また、吸入弁１４から膨張弁９までの配管に存在している冷媒は、室外熱交換器７および吸入弁１４を介してもガス管３に移動する。室内機１側の冷媒を液管４を介してガス管３に回収し、制御装置が、圧縮機５の吸入圧力が所定の値より低くなったと判断した場合、バイパス弁１７および吸入弁１４を閉とする。以上により、吸入弁１４の四方弁６側からガス管弁１３の室内熱交換器１０までの間（吸入弁１４−四方弁６−室外熱交換器７−膨張弁９−室内熱交換器１０−ガス管弁１３の間）の冷媒のほとんどがガス管弁１３と吸入弁１４との間に移動し、ガス管弁１３と吸入弁１４との間、すなわちガス管３を主とする部分に回収される。
なお、暖房運転の際、室外漏洩検知センサ２２のみが冷媒の漏洩を検知した場合でも、上記動作で冷媒を回収できる。 (4-1) When both indoor leakage detection sensor 12 and outdoor leakage detection sensor 22 detect refrigerant leakage during heating operation, installed in indoor leakage detection sensor 12 and outdoor unit 2 installed in indoor unit 1 When the leakage of the refrigerant is detected by the outdoor leakage detection sensor 22, the control device closes the gas pipe valve 13 and opens the bypass electromagnetic valve 17. During the heating operation, the liquid refrigerant existing in the liquid pipe 4 from the downstream of the indoor heat exchanger 10 moves to the gas pipe 3 through the bypass valve 17 and the compressor 5. The refrigerant existing in the pipe from the intake valve 14 to the expansion valve 9 also moves to the gas pipe 3 through the outdoor heat exchanger 7 and the intake valve 14. When the refrigerant on the indoor unit 1 side is collected in the gas pipe 3 via the liquid pipe 4 and the control device determines that the suction pressure of the compressor 5 has become lower than a predetermined value, the bypass valve 17 and the suction valve 14 are turned on. Closed. As described above, from the four-way valve 6 side of the suction valve 14 to the indoor heat exchanger 10 of the gas pipe valve 13 (suction valve 14-four-way valve 6-outdoor heat exchanger 7-expansion valve 9-indoor heat exchanger 10- Most of the refrigerant (between the gas pipe valve 13) moves between the gas pipe valve 13 and the suction valve 14, and is recovered between the gas pipe valve 13 and the suction valve 14, that is, in a portion mainly including the gas pipe 3. Is done.
In the heating operation, the refrigerant can be recovered by the above operation even when only the outdoor leak detection sensor 22 detects the refrigerant leak.

（４−２）冷房運転の際、室内漏洩検知センサ１２および室外漏洩検知センサ２２の両方が冷媒の漏洩を検知した場合
室内機１に設置された室内漏洩検知センサ１２および室外機２に設置された室外漏洩検知センサ２２によって冷媒の漏洩が検知されると、制御装置は、圧縮機５を停止しガス管弁１３を閉、バイパス電磁弁１７と開とし、膨張弁９を全開とする。冷房運転の際に室外熱交換器７の下流から膨張弁９に存在している液冷媒は、圧力差によって膨張弁９とバイパス電磁弁１７を設けたバイパス管１６とを介して圧縮機５の吸入側に速やかに移動する。制御装置は、圧縮機５の吸入側に設けられた圧力計からの信号によって、圧縮機５の吸入圧力が第２の所定値より高くなったと判断した場合、四方弁６を暖房運転に切り替えて圧縮機５を運転する。なお、蒸気は圧縮機５を一旦停止したが、圧縮機５を停止せず、四方弁６を暖房運転に切り替えるだけでもよい。 (4-2) When cooling operation is performed, both the indoor leakage detection sensor 12 and the outdoor leakage detection sensor 22 detect refrigerant leakage. The indoor leakage detection sensor 12 installed in the indoor unit 1 and the outdoor unit 2 are installed. When the refrigerant leakage is detected by the outdoor leakage detection sensor 22, the control device stops the compressor 5, closes the gas pipe valve 13, opens the bypass solenoid valve 17, and opens the expansion valve 9 fully. The liquid refrigerant present in the expansion valve 9 from the downstream of the outdoor heat exchanger 7 during the cooling operation passes through the expansion valve 9 and the bypass pipe 16 provided with the bypass electromagnetic valve 17 due to the pressure difference. Move quickly to the inhalation side. When the control device determines that the suction pressure of the compressor 5 has become higher than the second predetermined value based on a signal from a pressure gauge provided on the suction side of the compressor 5, the control device switches the four-way valve 6 to the heating operation. The compressor 5 is operated. In addition, although the steam stopped the compressor 5 once, you may only switch the four-way valve 6 to heating operation, without stopping the compressor 5. FIG.

室内機１側の冷媒を液管４を介してガス管３に回収し、制御装置が、圧縮機５の吸入側に設けられた圧力計からの信号によって、圧縮機５の吸入圧力が第１の所定値より低くなったと判断した場合、バイパス弁１７と吸入弁１４とを閉とする。以上により、吸入弁１４の四方弁６側からガス管弁１３の室内熱交換器１０までの間（吸入弁１４−四方弁６−室外熱交換器７−膨張弁９−室内熱交換器１０−ガス管弁１３の間）の冷媒のほとんどがガス管弁１３と吸入弁１４との間に移動し、冷媒がガス管弁１３と吸入弁１４との間、すなわちガス管３を主とする部分に回収される。
なお、冷房運転の際、室外漏洩検知センサ２２のみが冷媒の漏洩を検知した場合でも、上記動作で冷媒を回収できる。 The refrigerant on the indoor unit 1 side is collected in the gas pipe 3 via the liquid pipe 4, and the control device determines the suction pressure of the compressor 5 based on the signal from the pressure gauge provided on the suction side of the compressor 5. When it is determined that the value is lower than the predetermined value, the bypass valve 17 and the intake valve 14 are closed. As described above, from the four-way valve 6 side of the suction valve 14 to the indoor heat exchanger 10 of the gas pipe valve 13 (suction valve 14-four-way valve 6-outdoor heat exchanger 7-expansion valve 9-indoor heat exchanger 10- Most of the refrigerant between the gas pipe valve 13) moves between the gas pipe valve 13 and the suction valve 14, and the refrigerant is between the gas pipe valve 13 and the suction valve 14, that is, the part mainly composed of the gas pipe 3. To be recovered.
In the cooling operation, even when only the outdoor leakage detection sensor 22 detects the leakage of the refrigerant, the refrigerant can be collected by the above operation.

本実施の形態に示す冷凍サイクル装置およびその制御方法では、実施の形態３に示す冷凍サイクル装置およびその制御方法と同様の効果がある。また、本実施の形態に示す冷凍サイクル装置およびその制御方法では、室内漏洩検知センサ１２と室外漏洩検知センサ２２との両方が冷媒の漏洩を検知した場合、および室外漏洩検知センサ２２のみが冷媒の漏洩を検知した場合でも、暖房運転の際に室内熱交換器１０の下流から液管４内に存在している液冷媒がバイパス管１６を介してガス管３側に速やかに移動するので、実施の形態２に示す冷凍サイクル装置およびその制御方法よりも室内機１の冷媒を速やかに回収できる。したがって、ガス管３側に存在するガス冷媒よりも物質量の多い液管４側に存在する冷媒を速やかに回収できるので、回収動作中の漏洩冷媒量も低減できる効果もある。また、本実施の形態に示す冷凍サイクル装置およびその制御方法では、冷房運転の際に室外熱交換器７の下流から膨張弁９内に存在している液冷媒がバイパス電磁弁１７を介してガス管３側に速やかに移動するので、実施の形態２に示す冷凍サイクル装置よりも室外機２の冷媒を速やかに回収できる。したがって、ガス管３側に存在するガス冷媒よりも物質量の多い液管４側に存在する冷媒をより速やかに回収できるので、回収動作中の漏洩冷媒量もより低減できる効果もある。さらに、本実施の形態に示す冷凍サイクル装置およびその制御方法では、冷媒を液管４よりも流路断面積の大きいガス管３側に回収するため、より多くの冷媒をガス管３に回収することが可能である。   The refrigeration cycle apparatus and its control method shown in the present embodiment have the same effects as the refrigeration cycle apparatus and its control method shown in the third embodiment. Further, in the refrigeration cycle apparatus and the control method thereof shown in the present embodiment, when both the indoor leakage detection sensor 12 and the outdoor leakage detection sensor 22 detect the leakage of the refrigerant, only the outdoor leakage detection sensor 22 has the refrigerant. Even when leakage is detected, the liquid refrigerant present in the liquid pipe 4 from the downstream of the indoor heat exchanger 10 quickly moves to the gas pipe 3 side via the bypass pipe 16 during the heating operation. The refrigerant of the indoor unit 1 can be recovered more quickly than the refrigeration cycle apparatus and its control method shown in the second embodiment. Therefore, since the refrigerant existing on the liquid pipe 4 side having a larger amount of material than the gas refrigerant existing on the gas pipe 3 side can be recovered quickly, the leakage refrigerant amount during the recovery operation can also be reduced. Further, in the refrigeration cycle apparatus and the control method thereof shown in the present embodiment, the liquid refrigerant present in the expansion valve 9 from the downstream of the outdoor heat exchanger 7 during the cooling operation is passed through the bypass electromagnetic valve 17. Since it moves to the pipe 3 side quickly, the refrigerant of the outdoor unit 2 can be recovered more quickly than the refrigeration cycle apparatus shown in the second embodiment. Accordingly, the refrigerant present on the liquid pipe 4 side having a larger amount of substance than the gas refrigerant present on the gas pipe 3 side can be collected more quickly, and the amount of leaked refrigerant during the collecting operation can also be reduced. Furthermore, in the refrigeration cycle apparatus and the control method thereof shown in the present embodiment, the refrigerant is recovered to the gas pipe 3 side having a larger flow path cross-sectional area than the liquid pipe 4, so that more refrigerant is recovered to the gas pipe 3. It is possible.

上記実施の形態１から４に示す冷凍サイクル装置に使用される室内漏洩検知センサ１２および室外漏洩検知センサ２２は、冷媒ガスを直接検出するものに限らず、酸素濃度を測定し、この酸素濃度に基づいて冷媒の漏洩を検知するものでもよい。また、室内漏洩検知センサ１２および室外漏洩検知センサ２２は、運転中の冷媒温度や圧力、圧縮機の入力などから冷媒漏れを間接的に検出する手段であっても良い。さらに、室内漏洩検知センサ１２を室内機１に設けたが、必ずしも室内機１に設ける必要はなく、室内に設ければよい。   The indoor leak detection sensor 12 and the outdoor leak detection sensor 22 used in the refrigeration cycle apparatus shown in the first to fourth embodiments are not limited to those that directly detect the refrigerant gas, but measure the oxygen concentration, Based on this, the leakage of the refrigerant may be detected. Further, the indoor leakage detection sensor 12 and the outdoor leakage detection sensor 22 may be means for indirectly detecting refrigerant leakage from the refrigerant temperature and pressure during operation, the input of the compressor, and the like. Furthermore, although the indoor leak detection sensor 12 is provided in the indoor unit 1, it is not necessarily provided in the indoor unit 1, and may be provided indoors.

また、上記本実施の形態１から４に示す冷凍サイクル装置には、フロン系冷媒、または二酸化炭素もしくは炭化水素等の自然冷媒などが使用される。これら冷媒の中でも、漏洩した場合に環境に与える負荷の大きな例えば温暖化係数の大きな冷媒、可燃性のある冷媒などの漏洩対策に特に有効である。   In the refrigeration cycle apparatus shown in the first to fourth embodiments, a chlorofluorocarbon refrigerant or a natural refrigerant such as carbon dioxide or hydrocarbon is used. Among these refrigerants, it is particularly effective for countermeasures against leakage of a refrigerant having a large load on the environment when leaked, for example, a refrigerant having a large global warming potential or a flammable refrigerant.

１ 室内機、２ 室外機、３ ガス管、４ 液管、５ 圧縮機、６ 四方弁、７ 室外熱交換器、８ 室外ファン、９ 膨張弁、１０ 室内熱交換器、１１ 室内ファン、１２ 室内漏洩検知センサ、１３ ガス管弁、１４ 吸入弁、１６ バイパス管、１７ バイパス弁、２２ 室外漏洩検知センサ。   1 indoor unit, 2 outdoor unit, 3 gas pipe, 4 liquid pipe, 5 compressor, 6 four-way valve, 7 outdoor heat exchanger, 8 outdoor fan, 9 expansion valve, 10 indoor heat exchanger, 11 indoor fan, 12 indoor Leakage detection sensor, 13 Gas pipe valve, 14 Suction valve, 16 Bypass pipe, 17 Bypass valve, 22 Outdoor leak detection sensor.

Claims (9)

冷媒を圧縮する圧縮機、前記冷媒と室内の空気とを熱交換する室内熱交換器、冷媒を膨張する膨張弁および前記冷媒と室外の空気とを熱交換する室外熱交換器が配管で接続され、前記室内熱交換器は室内に設置される室内機に設けられ、前記圧縮機、前記膨張弁および前記室外熱交換器は室外に設置される室外機に設けられる冷凍サイクル装置において、
前記室内熱交換器と前記膨張弁との間を接続する配管である液管、
前記圧縮機と前記室内熱交換器との間を接続する配管であり、前記液管より大きい流路断面積を有するガス管、
前記圧縮機の吸入側の配管に設けられる吸入弁、
前記ガス管に設けられるガス管弁、
前記室内に設けられ前記冷媒の漏洩を検知する室内漏洩検知センサ、
前記室内漏洩検知センサが前記冷媒の漏洩を検知した場合に、前記ガス管弁を閉じ、前記室内機側の冷媒を前記液管を介して前記ガス管に回収した後に前記吸入弁を閉じる制御装置を備えたことを特徴とする冷凍サイクル装置。 A compressor that compresses the refrigerant, an indoor heat exchanger that exchanges heat between the refrigerant and indoor air, an expansion valve that expands the refrigerant, and an outdoor heat exchanger that exchanges heat between the refrigerant and outdoor air are connected by piping. In the refrigeration cycle apparatus, the indoor heat exchanger is provided in an indoor unit installed indoors, and the compressor, the expansion valve, and the outdoor heat exchanger are provided in an outdoor unit installed outdoors.
A liquid pipe that is a pipe connecting the indoor heat exchanger and the expansion valve;
A gas pipe that connects between the compressor and the indoor heat exchanger, and has a larger cross-sectional area than the liquid pipe;
A suction valve provided in a pipe on the suction side of the compressor;
A gas pipe valve provided in the gas pipe,
An indoor leakage detection sensor provided in the room for detecting leakage of the refrigerant;
A control device that closes the gas pipe valve when the indoor leak detection sensor detects leakage of the refrigerant, and closes the suction valve after collecting the refrigerant on the indoor unit side into the gas pipe via the liquid pipe A refrigeration cycle apparatus comprising: 冷媒を圧縮する圧縮機、前記冷媒と室内の空気とを熱交換する室内熱交換器、冷媒を膨張する膨張弁および前記冷媒と室外の空気とを熱交換する室外熱交換器が配管で接続され、前記室内熱交換器は室内に設置される室内機に設けられ、前記圧縮機、前記膨張弁および前記室外熱交換器は室外に設置される室外機に設けられる冷凍サイクル装置の制御方法において、
前記冷凍サイクル装置は、前記室内熱交換器と前記膨張弁との間を接続する配管である液管、
前記圧縮機と前記室内熱交換器との間を接続する配管であり、前記液管より大きい流路断面積を有するガス管、
前記圧縮機の吸入側の配管に設けられる吸入弁、
前記ガス管に設けられるガス管弁、
および前記室内に設けられ前記冷媒の漏洩を検知する室内漏洩検知センサを備え、
前記制御装置は、前記室内漏洩検知センサが前記冷媒の漏洩を検知した場合に、前記ガス管弁を閉じ、前記室内機側の冷媒を前記液管を介して前記ガス管に回収した後に前記吸入弁を閉じることを特徴とする冷凍サイクル装置の制御方法。 A compressor that compresses the refrigerant, an indoor heat exchanger that exchanges heat between the refrigerant and indoor air, an expansion valve that expands the refrigerant, and an outdoor heat exchanger that exchanges heat between the refrigerant and outdoor air are connected by piping. In the control method of the refrigeration cycle apparatus, the indoor heat exchanger is provided in an indoor unit installed indoors, and the compressor, the expansion valve, and the outdoor heat exchanger are provided in an outdoor unit installed outdoor.
The refrigeration cycle apparatus is a liquid pipe that is a pipe connecting the indoor heat exchanger and the expansion valve,
A gas pipe that connects between the compressor and the indoor heat exchanger, and has a larger cross-sectional area than the liquid pipe;
A suction valve provided in a pipe on the suction side of the compressor;
A gas pipe valve provided in the gas pipe,
And an indoor leakage detection sensor provided in the room for detecting leakage of the refrigerant,
The control device closes the gas pipe valve when the indoor leak detection sensor detects the leakage of the refrigerant, collects the refrigerant on the indoor unit side into the gas pipe through the liquid pipe, and then sucks the refrigerant. A control method for a refrigeration cycle apparatus, wherein the valve is closed. 冷凍サイクル装置は、圧縮機の吐出側の配管に設けられ、冷房運転の際には前記圧縮機の吐出側から室外熱交換器へ冷媒が流れるよう流路を構成し、暖房運転の際には前記圧縮機の吐出側から室内熱交換器へ前記冷媒が流れるよう流路を構成する四方弁を備え、
冷房運転の際に室内漏洩検知センサが冷媒の漏洩を検知した場合には、前記四方弁を暖房運転に切り替えることを特徴とする請求項２に記載の冷凍サイクル装置の制御方法。 The refrigeration cycle apparatus is provided in a pipe on the discharge side of the compressor, and configures a flow path so that refrigerant flows from the discharge side of the compressor to the outdoor heat exchanger during the cooling operation, and during the heating operation. Comprising a four-way valve constituting a flow path so that the refrigerant flows from the discharge side of the compressor to the indoor heat exchanger;
The method for controlling a refrigeration cycle apparatus according to claim 2, wherein the four-way valve is switched to heating operation when an indoor leakage detection sensor detects leakage of refrigerant during cooling operation. 室内漏洩検知センサが冷媒の漏洩を検知した場合に膨張弁を全開にすることを特徴とする請求項２または３に記載の冷凍サイクル装置の制御方法。   The control method for a refrigeration cycle apparatus according to claim 2 or 3, wherein the expansion valve is fully opened when the indoor leakage detection sensor detects leakage of the refrigerant. 室内漏洩検知センサが冷媒の漏洩を検知した場合に、ガス管弁を閉じ、所定時間経過後に吸入弁を閉じることを特徴とする請求項２から４のいずれか１項に記載の冷凍サイクル装置の制御方法。   5. The refrigeration cycle apparatus according to claim 2, wherein when the indoor leakage detection sensor detects leakage of the refrigerant, the gas pipe valve is closed and the intake valve is closed after a predetermined time has elapsed. Control method. 冷凍サイクル装置は、圧縮機の吸入側の配管に圧力センサを備え、
室内漏洩検知センサが冷媒の漏洩を検知した場合に、ガス管弁を閉じ、前記圧力センサの値が所定値以下になったときに吸入弁を閉じることを特徴とする請求項２から４のいずれか１項に記載の冷凍サイクル装置の制御方法。 The refrigeration cycle apparatus includes a pressure sensor in a pipe on the suction side of the compressor,
5. The system according to claim 2, wherein when the indoor leakage detection sensor detects refrigerant leakage, the gas pipe valve is closed, and the suction valve is closed when the value of the pressure sensor becomes a predetermined value or less. The control method of the refrigeration cycle apparatus of Claim 1. 冷凍サイクル装置は、圧縮機の吸入側の配管と液管とを接続するバイパス管および前記バイパス管に設けられるバイパス弁を備え、
室内漏洩検知センサが冷媒の漏洩を検知した場合に、前記バイパス弁を開けることを特徴とする請求項２から６のいずれか１項に記載の冷凍サイクル装置の制御方法。 The refrigeration cycle apparatus includes a bypass pipe connecting the pipe on the suction side of the compressor and the liquid pipe and a bypass valve provided in the bypass pipe,
The control method for a refrigeration cycle apparatus according to any one of claims 2 to 6, wherein the bypass valve is opened when the indoor leakage detection sensor detects refrigerant leakage. 冷凍サイクル装置は、室外機に設けられ冷媒の漏洩を検知する室外漏洩検知センサを備え、
前記室外漏洩検知センサが前記冷媒の漏洩を検知した場合に、前記ガス管弁を閉じ、前記室内機側の冷媒を前記液管を介して前記ガス管に回収した後に前記吸入弁を閉じることを特徴とする請求項２から７のいずれか１項に記載の冷凍サイクル装置の制御方法。 The refrigeration cycle apparatus includes an outdoor leakage detection sensor that is provided in the outdoor unit and detects leakage of refrigerant,
When the outdoor leak detection sensor detects leakage of the refrigerant, the gas pipe valve is closed, and after the refrigerant on the indoor unit side is collected in the gas pipe via the liquid pipe, the suction valve is closed. The method for controlling a refrigeration cycle apparatus according to any one of claims 2 to 7, wherein 冷凍サイクル装置は、圧縮機の吐出側の配管に設けられ、冷房運転の際には圧縮機の吐出側から室外熱交換器へ冷媒が流れるよう流路を構成し、暖房運転の際には前記圧縮機の吐出側から室内熱交換器へ前記冷媒が流れるよう流路を構成する四方弁と、室外機に設けられ前記冷媒の漏洩を検知する室外漏洩検知センサとを備え、
暖房運転の際に前記室外漏洩検知センサが前記冷媒の漏洩を検知した場合には、前記ガス管弁を閉じ、前記室内機側の前記冷媒を前記液管を介して前記ガス管に回収した後に前記吸入弁を閉じ、
冷房運転の際に前記室外漏洩検知センサが前記冷媒の漏洩を検知した場合には、前記圧縮機を停止し、前記ガス管弁を閉じて前記バイパス弁を開け、室外機側の前記冷媒を前記ガス管に回収した後に前記四方弁を暖房運転に切り替えることを特徴とする請求項７に記載の冷凍サイクル装置の制御方法。
The refrigeration cycle apparatus is provided in a pipe on the discharge side of the compressor, and configures a flow path so that refrigerant flows from the discharge side of the compressor to the outdoor heat exchanger during the cooling operation, and in the heating operation, A four-way valve that configures a flow path so that the refrigerant flows from the discharge side of the compressor to the indoor heat exchanger, and an outdoor leakage detection sensor that is provided in an outdoor unit and detects leakage of the refrigerant ,
When the outdoor leakage detection sensor detects leakage of the refrigerant during heating operation, the gas pipe valve is closed, and the refrigerant on the indoor unit side is collected into the gas pipe via the liquid pipe Close the suction valve,
When the outdoor leak detection sensor in the cooling operation detects the leakage of the refrigerant, the compressor is stopped, opening said bypass valve closes the gas pipe valve, the said refrigerant in the outdoor unit side The method for controlling a refrigeration cycle apparatus according to claim 7 , wherein the four-way valve is switched to heating operation after being collected in a gas pipe.
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