JP5631684B2 - air conditioner - Google Patents

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JP5631684B2
JP5631684B2 JP2010227667A JP2010227667A JP5631684B2 JP 5631684 B2 JP5631684 B2 JP 5631684B2 JP 2010227667 A JP2010227667 A JP 2010227667A JP 2010227667 A JP2010227667 A JP 2010227667A JP 5631684 B2 JP5631684 B2 JP 5631684B2
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pressure
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oil
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JP2012082992A (en
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弘樹 成安
弘樹 成安
正弘 阿倉
正弘 阿倉
一就 野田
一就 野田
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Yanmar Co Ltd
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Description

本発明は、オイルセパレータを有する空調機に関するものである。   The present invention relates to an air conditioner having an oil separator.

一般に、空調機は、圧縮機の吐出ラインにオイルセパレータを設け、このオイルセパレータによって吐出冷媒から分離したオイルを圧縮機へと戻すようになされている。   In general, an air conditioner is provided with an oil separator in a discharge line of a compressor, and oil separated from discharge refrigerant by the oil separator is returned to the compressor.

従来より、このような圧縮機の吐出ラインにオイルセパレータを有する空調機において、オイルセパレータから圧縮機へのオイル戻しラインで圧縮機上流のキャピラリよりもさらに上流側に開閉弁を設けたものが提案されている（例えば、特許文献１参照）。   Conventionally, in such an air conditioner having an oil separator in the discharge line of the compressor, an oil return line from the oil separator to the compressor is provided with an on-off valve further upstream than the capillary upstream of the compressor. (For example, refer to Patent Document 1).

特開平１０−１９４０８号公報Japanese Patent Laid-Open No. 10-19408

しかし、上記従来の空調機は、上記開閉弁のゴミ噛み等による不具合を検知する構成については開示されていない。   However, the above-described conventional air conditioner does not disclose a configuration for detecting a malfunction caused by dust biting of the on-off valve.

本発明は係る実情に鑑みてなされたものであって、上記不具合を検知することができる構成を開示することを目的としている。   The present invention has been made in view of the actual situation, and an object thereof is to disclose a configuration capable of detecting the above-described malfunction.

上記課題を解決するための本発明の空調機は、圧縮機の吐出ラインにオイルセパレータを設け、オイルセパレータから圧縮機へのオイル戻しラインで圧縮機上流のキャピラリよりも上流に開閉弁を設けた空調機において、前記キャピラリと前記開閉弁の間に圧力センサを設け、前記開閉弁が開状態のときに前記圧力センサの検出圧と圧縮機吸入圧との差圧の絶対値が第１所定値以下であるか、または前記検出圧と圧縮機吐出圧との差圧の絶対値が第２所定値以上であることを所定時間継続して検知した場合にオイル戻しラインの圧力が圧縮機吸入圧力に近い現象が発生しているとして前記開閉弁が異常と判定するものである。 The air conditioner of the present invention for solving the above problems is provided with an oil separator in the discharge line of the compressor, and an on-off valve upstream of the capillary upstream of the compressor in the oil return line from the oil separator to the compressor. In the air conditioner, a pressure sensor is provided between the capillary and the on-off valve, and the absolute value of the differential pressure between the pressure detected by the pressure sensor and the compressor suction pressure is a first predetermined value when the on-off valve is open. Or the pressure in the oil return line is detected when the absolute value of the differential pressure between the detected pressure and the compressor discharge pressure is equal to or greater than a second predetermined value for a predetermined time. It is determined that the on-off valve is abnormal as a phenomenon close to the above occurs .

また、上記課題を解決するための本発明の空調機は、複数台の圧縮機を設け、各圧縮機の吐出ラインの合流ラインにオイルセパレータを設け、オイルセパレータから各圧縮機へのオイル戻しラインで圧縮機上流のキャピラリよりも上流にそれぞれ開閉弁を設けた空調機において、前記キャピラリと前記開閉弁の間にそれぞれ圧力センサを設け、運転圧縮機と停止圧縮機が混在する場合で停止圧縮機へのオイル戻しラインの開閉弁が閉状態のときに前記圧力センサの検出圧と圧縮機吸入圧との差圧の絶対値が第１所定値以上であるか、または前記検出圧と圧縮機吐出圧との差圧の絶対値が第２所定値以下であることを所定時間継続して検知した場合にオイル戻しラインの圧力が圧縮機吸入圧力に近い現象が発生しているとして前記開閉弁が異常と判定するものである。 Moreover, the air conditioner of the present invention for solving the above-mentioned problems is provided with a plurality of compressors, an oil separator is provided in a confluence line of a discharge line of each compressor, and an oil return line from the oil separator to each compressor In an air conditioner having an on-off valve upstream of a capillary upstream of the compressor, a pressure sensor is provided between the capillary and the on-off valve, respectively, and a stop compressor is used when an operating compressor and a stop compressor are mixed. When the on-off valve of the oil return line to the closed state is closed, the absolute value of the differential pressure between the detected pressure of the pressure sensor and the compressor suction pressure is greater than or equal to a first predetermined value, or the detected pressure and the compressor discharge the on-off valve as the absolute value of the differential pressure between the pressure is a phenomenon close pressure oil return line to the compressor suction pressure when detected that is less than the second predetermined value for the predetermined period has occurred Abnormal It is intended to determine.

以上述べたように、請求項１記載の本発明によると、オイル戻しラインの開閉弁が正常に開いていればオイル戻しラインの圧力が圧縮機吐出圧に近くなり、ゴミ噛み等で正常な開度でなければオイル戻しラインの圧力が圧縮機吸入圧に近くなる現象を利用することにより、開閉弁の開度が正常か否かを精度良く判定することが可能となる。従って、圧縮機のオイル切れの予測が可能となる。   As described above, according to the first aspect of the present invention, if the on-off valve of the oil return line is normally opened, the pressure of the oil return line becomes close to the compressor discharge pressure, and the normal opening due to dust biting or the like. If the pressure is not high, it is possible to accurately determine whether the opening degree of the on-off valve is normal or not by using a phenomenon in which the pressure in the oil return line becomes close to the compressor suction pressure. Therefore, it is possible to predict the oil out of the compressor.

また、請求項２記載の本発明によると、複数台の圧縮機を設けた空調機で運転圧縮機と停止圧縮機が混在する場合で停止圧縮機へのオイル戻しラインの開閉弁が正常に閉じていればオイル戻しラインの圧力が圧縮機吸入圧に近くなり、ゴミ噛み等で開閉弁が開いていればオイル戻しラインの圧力が圧縮機吐出圧に近くなる現象を利用することにより、開閉弁の開度が正常か否かを精度良く判定することが可能となる。従って、停止圧縮機にオイルが溜まりこむことによる運転圧縮機のオイル切れの予測が可能となる。   According to the second aspect of the present invention, when the operation compressor and the stop compressor are mixed in an air conditioner provided with a plurality of compressors, the on-off valve of the oil return line to the stop compressor is normally closed. If the oil return line pressure is close to the compressor suction pressure, the oil return line pressure is close to the compressor discharge pressure if the on-off valve is open due to dust biting, etc. It is possible to accurately determine whether or not the opening degree is normal. Therefore, it is possible to predict the oil shortage of the operation compressor due to the oil collecting in the stop compressor.

本発明に係る空調機の要部の構成を示す冷媒回路図である。It is a refrigerant circuit diagram which shows the structure of the principal part of the air conditioner which concerns on this invention.

以下、本発明の実施の形態を図面を参照して説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は空調機の要部の構成を示している。   FIG. 1 shows a configuration of a main part of the air conditioner.

この空調機は、圧縮機１ａ、１ｂの吐出ライン１１にオイルセパレータ２を設け、オイルセパレータ２から圧縮機１ａ、１ｂへのオイル戻しライン３で圧縮機１ａ、１ｂの上流のキャピラリ４ａ、４ｂよりも上流に開閉弁５ａ、５ｂを設けた空調機において、前記キャピラリ４ａ、４ｂと前記開閉弁５ａ、５ｂの間に圧力センサＰＨａ、ＰＨｂを設けて構成されており、前記開閉弁５ａ、５ｂの異常を判定するようになされている。   This air conditioner is provided with an oil separator 2 in the discharge line 11 of the compressors 1a and 1b, and from the capillaries 4a and 4b upstream of the compressors 1a and 1b in the oil return line 3 from the oil separator 2 to the compressors 1a and 1b. In the air conditioner provided with the on-off valves 5a and 5b upstream, pressure sensors PHa and PHb are provided between the capillaries 4a and 4b and the on-off valves 5a and 5b. An abnormality is judged.

空調機は、圧縮機１ａ、１ｂで圧縮した冷媒を吐出ライン１１を介して導入したオイルセパレータ２で冷媒とオイルに分離する。このうち、冷媒は、暖房運転の場合、四方弁１２を介して室内熱交換器（図示省略）で放熱して凝縮液化した後、各種冷媒経路を経て最後は、電子膨張弁（図示省略）を経て室外熱交換器１３、１３で蒸発気化した後、四方弁１２からアキュームレータ１４を経て再度圧縮機１ａ、１ｂへと吸引される。また、冷房運転の場合、冷媒は、四方弁１２を介して室外熱交換器１３、１３で放熱して凝縮液化した後、各種冷媒経路を経て最後は、電子膨張弁（図示省略）を経て室内熱交換器（図示省略）で蒸発気化した後、四方弁１２からアキュームレータ１４を経て再度圧縮機１ａ、１ｂへと吸引される。   The air conditioner separates the refrigerant compressed by the compressors 1 a and 1 b into refrigerant and oil by the oil separator 2 introduced through the discharge line 11. Among these, in the case of heating operation, the refrigerant radiates and condenses and liquefies through an indoor heat exchanger (not shown) via the four-way valve 12, and finally passes through various refrigerant paths to finally an electronic expansion valve (not shown). Then, after evaporating and evaporating in the outdoor heat exchangers 13 and 13, it is sucked again from the four-way valve 12 through the accumulator 14 to the compressors 1a and 1b. In the cooling operation, the refrigerant radiates heat in the outdoor heat exchangers 13 and 13 through the four-way valve 12 to be condensed and liquefied, passes through various refrigerant paths, and finally passes through an electronic expansion valve (not shown) to the room. After evaporating and evaporating with a heat exchanger (not shown), the refrigerant is sucked again from the four-way valve 12 through the accumulator 14 to the compressors 1a and 1b.

圧縮機１ａ、１ｂは、冷媒の吐出ライン１１と吸引ライン１５との間に並列に接続されている。一方の圧縮機１ｂは、吐出直後の位置に逆止弁１０が設けられており、一方の圧縮機１ａのみの運転を行った場合に、休止している他方の圧縮機１ｂへと冷媒が逆流しないようになされている。   The compressors 1 a and 1 b are connected in parallel between the refrigerant discharge line 11 and the suction line 15. One compressor 1b is provided with a check valve 10 at a position immediately after discharge, and when only one compressor 1a is operated, the refrigerant flows back to the other compressor 1b that is at rest. It is made not to do.

オイルセパレータ２は、圧縮機１ａ、１ｂで圧縮した冷媒がフィルタ２１を介して流入するように構成されている。圧縮された冷媒はガス化されているが、オイルは液状のままなので、このオイルセパレータ２では、冷媒と、オイルとを分離した後、冷媒のみを四方弁１２側へと吐出するように構成されている。この高圧冷媒は、逆止弁２２によって、四方弁１２側からは逆流しないように構成されている。また、液状のオイルはオイルセパレータ２の底に溜まるので、このオイルセパレータ２からオイル戻しライン３を介して圧縮機１ａ、１ｂへと戻される。   The oil separator 2 is configured such that the refrigerant compressed by the compressors 1 a and 1 b flows through the filter 21. Since the compressed refrigerant is gasified, but the oil remains liquid, the oil separator 2 is configured to discharge only the refrigerant to the four-way valve 12 side after separating the refrigerant and the oil. ing. The high-pressure refrigerant is configured not to flow backward from the four-way valve 12 side by the check valve 22. Further, since the liquid oil accumulates at the bottom of the oil separator 2, it is returned from the oil separator 2 to the compressors 1a and 1b via the oil return line 3.

オイル戻しライン３は、オイルセパレータ２底部から導出され、それぞれの圧縮機１ａ、１ｂに対応した二つのオイル戻しライン３ａ、３ｂに分岐して、これら圧縮機１ａ、１ｂへと接続されている。この二つのオイル戻しライン３ａ、３ｂにおいて、圧縮機１ａ、１ｂの上流側にはキャピラリ４ａ、４ｂが設けられている。また、キャピラリ４ａ、４ｂの上流側には開閉弁５ａ、５ｂが設けられている。これらキャピラリ４ａ、４ｂと開閉弁５ａ、５ｂとの間には、圧力センサＰＨａ、ＰＨｂを設けている。   The oil return line 3 is led out from the bottom of the oil separator 2, branches into two oil return lines 3a and 3b corresponding to the compressors 1a and 1b, and is connected to the compressors 1a and 1b. In these two oil return lines 3a and 3b, capillaries 4a and 4b are provided upstream of the compressors 1a and 1b. In addition, on-off valves 5a and 5b are provided upstream of the capillaries 4a and 4b. Pressure sensors PHa and PHb are provided between the capillaries 4a and 4b and the on-off valves 5a and 5b.

この圧力センサＰＨａ、ＰＨｂは、開閉弁５ａ、５ｂの異常を検知することができるようになされている。   The pressure sensors PHa and PHb can detect an abnormality in the on-off valves 5a and 5b.

次に、圧力センサＰＨａ、ＰＨｂによる開閉弁５ａ、５ｂの異常の検知について説明する。   Next, detection of abnormality of the on-off valves 5a and 5b by the pressure sensors PHa and PHb will be described.

まず、圧縮機１ａ、１ｂが運転され、開閉弁５ａ、５ｂが共に「開」状態の場合、圧力センサＰＨａ、ＰＨｂの検出圧力は、圧縮機１ａ、１ｂの吸入圧および吐出圧と対比される。この際、吸入圧は、冷媒の戻り経路に設けられた圧力センサＰＬから得られた圧力から測定される。吐出圧は、吐出ライン１１に設けられた圧力センサＰＨから測定される。   First, when the compressors 1a and 1b are operated and the on-off valves 5a and 5b are both in the “open” state, the detected pressures of the pressure sensors PHa and PHb are compared with the suction pressure and the discharge pressure of the compressors 1a and 1b. . At this time, the suction pressure is measured from the pressure obtained from the pressure sensor PL provided in the return path of the refrigerant. The discharge pressure is measured from a pressure sensor PH provided in the discharge line 11.

まず、圧力センサＰＨａ、ＰＨｂの検出圧力は、開閉弁５ａ、５ｂが正常に開いていれば、圧縮機１ａ、１ｂからの吐出圧に近くなり、開閉弁５ａ、５ｂがゴミ噛み等によって正常に開いていない場合は、吸入圧に近くなる。   First, the detected pressure of the pressure sensors PHa and PHb is close to the discharge pressure from the compressors 1a and 1b if the on-off valves 5a and 5b are normally opened. If it is not open, it will be close to the suction pressure.

したがって、前記検出圧力と吸入圧との差の絶対値が第一所定値以下であることを所定時間継続して検知した場合、開閉弁５ａ、５ｂがゴミ噛み等によって正常に開いておらず、異常であると判定することができる。   Therefore, when it is continuously detected that the absolute value of the difference between the detected pressure and the suction pressure is equal to or less than the first predetermined value for a predetermined time, the on-off valves 5a and 5b are not normally opened due to dust biting or the like, It can be determined that there is an abnormality.

また、前記検出圧力と吐出圧との差の絶対値が第二所定値以上であることを所定時間継続して検知した場合、開閉弁５ａ、５ｂがゴミ噛み等によって正常に開いておらず、異常であると判定することができる。   In addition, when it is continuously detected that the absolute value of the difference between the detected pressure and the discharge pressure is equal to or greater than the second predetermined value for a predetermined time, the on-off valves 5a and 5b are not normally opened due to dust biting or the like, It can be determined that there is an abnormality.

上記した判定は、検出圧力と吸入圧との対比、または検出圧力と吐出圧との対比、何れか一方を行うことによって判定するものであってもよいし、両方を行って判定するものであってもよい。   The above-described determination may be performed by comparing either the detected pressure and the suction pressure or the detected pressure and the discharge pressure, or by performing both. May be.

この判定により、空調機は、開閉弁５ａ、５ｂの開度が正常であるか否かを精度良く判定することが可能となる。したがって、開閉弁５ａ、５ｂの異常によりオイルが圧縮機１ａ、１ｂへと戻らず、圧縮機１ａ、１ｂでオイル切れを起こしているか否かの予測ができることとなる。   By this determination, the air conditioner can accurately determine whether or not the opening degree of the on-off valves 5a and 5b is normal. Therefore, the oil does not return to the compressors 1a and 1b due to the abnormality of the on-off valves 5a and 5b, and it is possible to predict whether or not the oil has run out in the compressors 1a and 1b.

次に、圧縮機１ａが運転され、圧縮機１ｂが停止され、開閉弁５ａが「開」、開閉弁５ｂが「閉」状態の場合、圧力センサＰＨａ、ＰＨｂの検出圧力は、圧縮機１ａ、１ｂの吸入圧および吐出圧と対比される。   Next, when the compressor 1a is operated, the compressor 1b is stopped, the on-off valve 5a is "open", and the on-off valve 5b is in the "closed" state, the detected pressures of the pressure sensors PHa, PHb are the compressor 1a, Contrast with the suction pressure and discharge pressure of 1b.

運転している圧縮機１ａ側の圧力センサＰＨａの検出圧力は、上記したように開閉弁５ａが正常に開いていれば、圧縮機１ａからの吐出圧に近くなり、開閉弁５ａがゴミ噛み等によって正常に開いていない場合は、吸入圧に近くなるので、上記と同様に開閉弁５ａの異常が判定される。   If the on-off valve 5a is normally opened as described above, the pressure detected by the operating pressure sensor PHa on the compressor 1a side is close to the discharge pressure from the compressor 1a, and the on-off valve 5a is engaged with dust etc. If the valve does not open normally, the pressure is close to the suction pressure, so that the abnormality of the on-off valve 5a is determined in the same manner as described above.

停止している圧縮機１ｂ側の圧力センサＰＨｂの検出圧力は、開閉弁５ｂが正常に閉じていれば、吸入圧に近くなり、開閉弁５ｂがゴミ噛み等によって正常に閉じていなければ、吐出圧に近くなる。   The detected pressure of the stopped pressure sensor PHb on the compressor 1b side is close to the suction pressure if the on-off valve 5b is normally closed, and is discharged if the on-off valve 5b is not normally closed due to dust or the like. Close to pressure.

したがって、前記検出圧力と吸入圧との差の絶対値が第一所定値以上であることを所定時間継続して検知した場合、開閉弁５ｂがゴミ噛み等によって正常に閉じておらず、異常であると判定することができる。   Therefore, when it is continuously detected that the absolute value of the difference between the detected pressure and the suction pressure is equal to or greater than the first predetermined value for a predetermined time, the on-off valve 5b is not normally closed due to dust biting or the like, which is abnormal. It can be determined that there is.

また、前記検出圧力と吐出圧との差の絶対値が第二所定値以下であることを所定時間継続して検知した場合、開閉弁５ａ、５ｂがゴミ噛み等によって正常に閉じておらず、異常であると判定することができる。   Further, when it is continuously detected that the absolute value of the difference between the detected pressure and the discharge pressure is equal to or less than the second predetermined value for a predetermined time, the on-off valves 5a and 5b are not normally closed due to dust biting or the like, It can be determined that there is an abnormality.

上記した判定は、検出圧力と吸入圧との対比、または検出圧力と吐出圧との対比、何れか一方を行うことによって判定するものであってもよいし、両方を行って判定するものであってもよい。   The above-described determination may be performed by comparing either the detected pressure and the suction pressure or the detected pressure and the discharge pressure, or by performing both. May be.

この判定により、空調機は、開閉弁５ａ、５ｂの開度、特に、停止側開閉弁５ｂの閉じ具合が正常であるか否かを精度良く判定することが可能となる。したがって、停止した圧縮機１ｂにオイルが溜まりこむことによる運転側の圧縮機１ａのオイル切れの予測ができることとなる。   By this determination, the air conditioner can accurately determine whether or not the opening degree of the on-off valves 5a and 5b, in particular, whether the stop-side on-off valve 5b is normally closed. Therefore, it is possible to predict the oil shortage of the compressor 1a on the operation side due to the oil collecting in the stopped compressor 1b.

なお、本実施の形態において、開閉弁５ａ、５ｂの異常を判定するための第一所定値および第二所定値は、小さな値に設定した場合、少しの変化でも異常と判定してしまうこととなり、大きな値に設定した場合、多少の変化でも異常と判定しなくなる。したがって、第一所定値および第二所定値は、その設定値をそれぞれの比較対象の吸入圧、吐出圧を測定する圧力センサＰＬ、ＰＨの感度に応じて適宜設定している。   In the present embodiment, if the first predetermined value and the second predetermined value for determining the abnormality of the on-off valves 5a and 5b are set to small values, even a slight change will determine that there is an abnormality. When set to a large value, even if there is a slight change, it will not be determined as abnormal. Therefore, the first predetermined value and the second predetermined value are appropriately set according to the sensitivity of the pressure sensors PL and PH that measure the suction pressure and discharge pressure of the respective comparison targets.

また、本実施の形態において、空調機は、２台の圧縮機１ａ、１ｂを備えており、オイル戻しライン３についても、二つのオイル戻しライン３ａ、３ｂに分岐しており、それぞれに、キャピラリ４ａ、４ｂと、開閉弁５ａ、５ｂと、圧力センサＰＨａ、ＰＨｂとが設けられているが、一台の圧縮機１ａで１つのオイル戻しライン３ａにキャピラリ４ａと、開閉弁５ａと、圧力センサＰＨａとが設けられた一系統の冷媒経路を有する空調機であっても、開閉弁５ａの異常を判定することができる。   In this embodiment, the air conditioner includes two compressors 1a and 1b, and the oil return line 3 is also branched into two oil return lines 3a and 3b. 4a, 4b, open / close valves 5a, 5b, and pressure sensors PHa, PHb are provided, but one compressor 1a includes a capillary 4a, an open / close valve 5a, and a pressure sensor in one oil return line 3a. Even an air conditioner having a single refrigerant path provided with PHa can determine whether the on-off valve 5a is abnormal.

本発明に係る空調機は、オイルセパレータを有する各種空調機に用いられる。   The air conditioner according to the present invention is used in various air conditioners having an oil separator.

１ａ、１ｂ 圧縮機
１１ 吐出ライン
２ オイルセパレータ
３、３ａ、３ｂ オイル戻しライン
４ａ、４ｂ キャピラリ
５ａ、５ｂ 開閉弁
ＰＨａ、ＰＨｂ 圧力センサ DESCRIPTION OF SYMBOLS 1a, 1b Compressor 11 Discharge line 2 Oil separator 3, 3a, 3b Oil return line 4a, 4b Capillary 5a, 5b On-off valve PHa, PHb Pressure sensor

Claims (2)

圧縮機の吐出ラインにオイルセパレータを設け、オイルセパレータから圧縮機へのオイル戻しラインで圧縮機上流のキャピラリよりも上流に開閉弁を設けた空調機において、
前記キャピラリと前記開閉弁の間に圧力センサを設け、
前記開閉弁が開状態のときに前記圧力センサの検出圧と圧縮機吸入圧との差圧の絶対値が第１所定値以下であるか、または前記検出圧と圧縮機吐出圧との差圧の絶対値が第２所定値以上であることを所定時間継続して検知した場合にオイル戻しラインの圧力が圧縮機吸入圧力に近い現象が発生しているとして前記開閉弁が異常と判定することを特徴とする空調機。 In an air conditioner provided with an oil separator in the discharge line of the compressor, and provided with an on-off valve upstream of the capillary upstream of the compressor in the oil return line from the oil separator to the compressor,
A pressure sensor is provided between the capillary and the on-off valve;
When the on-off valve is open, the absolute value of the differential pressure between the detected pressure of the pressure sensor and the compressor suction pressure is equal to or less than a first predetermined value, or the differential pressure between the detected pressure and the compressor discharge pressure That the oil return line pressure is close to the compressor suction pressure and the on- off valve is determined to be abnormal when it is detected that the absolute value of the oil pressure is equal to or greater than the second predetermined value continuously for a predetermined time Air conditioner characterized by. 複数台の圧縮機を設け、各圧縮機の吐出ラインの合流ラインにオイルセパレータを設け、オイルセパレータから各圧縮機へのオイル戻しラインで圧縮機上流のキャピラリよりも上流にそれぞれ開閉弁を設けた空調機において、
前記キャピラリと前記開閉弁の間にそれぞれ圧力センサを設け、
運転圧縮機と停止圧縮機が混在する場合で停止圧縮機へのオイル戻しラインの開閉弁が閉状態のときに前記圧力センサの検出圧と圧縮機吸入圧との差圧の絶対値が第１所定値以上であるか、または前記検出圧と圧縮機吐出圧との差圧の絶対値が第２所定値以下であることを所定時間継続して検知した場合にオイル戻しラインの圧力が圧縮機吸入圧力に近い現象が発生しているとして前記開閉弁が異常と判定することを特徴とする空調機。 A plurality of compressors are provided, an oil separator is provided in the merging line of the discharge line of each compressor, and an opening / closing valve is provided upstream of the capillary upstream of the compressor in the oil return line from the oil separator to each compressor. In air conditioners,
A pressure sensor is provided between the capillary and the on-off valve,
The absolute value of the differential pressure between the detected pressure of the pressure sensor and the compressor suction pressure is the first value when the operating compressor and the stop compressor are mixed and the on-off valve of the oil return line to the stop compressor is closed. When it is continuously detected for a predetermined time that the absolute value of the differential pressure between the detected pressure and the compressor discharge pressure is equal to or lower than a second predetermined value, the pressure in the oil return line is increased. An air conditioner characterized in that the on-off valve is determined to be abnormal because a phenomenon close to suction pressure has occurred .
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