JP4532454B2

JP4532454B2 - Air conditioner

Info

Publication number: JP4532454B2
Application number: JP2006275752A
Authority: JP
Inventors: 航祐田中; 毅内田; 智赤木; 祐二柳原
Original assignee: Mitsubishi Electric Corp; Mitsubishi Electric Building Techno-Service Co Ltd
Current assignee: Mitsubishi Electric Corp; Mitsubishi Electric Building Techno-Service Co Ltd
Priority date: 2006-10-06
Filing date: 2006-10-06
Publication date: 2010-08-25
Anticipated expiration: 2026-10-06
Also published as: JP2008096002A

Description

本発明は、ドレンパン内のドレンの異常運転状態を検出する空気調和機に関するものである。 The present invention relates to an air conditioner that detects an abnormal operation state of a drain in a drain pan.

第１の従来技術として、ドレンパン内にサーミスタ式センサを設置し、センサにドレンが着水したときに異常水位として検出する装置において、異常判定を複数ループとし、初期水位が高い場合には一定時間待機するとともに、ヒータ加熱によりセンサに付着した水滴を除去した後に検出を開始することにより、異常水位検出精度を向上させる技術が知られている（例えば、特許文献１参照）。 As a first prior art, in a device in which a thermistor type sensor is installed in a drain pan, and the drain water reaches the sensor, it is detected as an abnormal water level. There is known a technique for improving the detection accuracy of abnormal water level by waiting and at the same time starting detection after removing water droplets attached to the sensor by heating the heater (see, for example, Patent Document 1).

第２の従来技術として、ドレンパン上方に超音波式センサを設置し、ドレン面までの距離を検出し、初期水位に対してある一定値の水位になったときはドレンポンプを運転し、初期水位に戻ったときは運転を停止し、さらにフロートスイッチによりある一定値以上の水位が検出された場合には、空気調和機の運転を停止するという装置が存在する（例えば、特許文献２参照）。 As a second conventional technique, an ultrasonic sensor is installed above the drain pan, the distance to the drain surface is detected, and when the water level reaches a certain level with respect to the initial water level, the drain pump is operated. There is a device that stops the operation when returning to, and stops the operation of the air conditioner when a water level above a certain value is detected by the float switch (see, for example, Patent Document 2).

特開平１０−８２５４５号公報（段落００１３−００１６、図１、図３、図４）Japanese Patent Laid-Open No. 10-82545 (paragraphs 0013-0016, FIGS. 1, 3, and 4) 特開平５−１４１６８６号公報（段落０００８−００１０、図１）Japanese Patent Laid-Open No. 5-141686 (paragraphs 0008-0010, FIG. 1)

従来技術では、水位の異常上昇による水漏れのみを回避することができ、他の異常運転状態の検出は不可能であるため、サービス点検作業の際に異常運転状態の判別ができず、作業の負荷低減にはならないという課題があった。 In the prior art, only a water leak due to an abnormal rise in the water level can be avoided, and other abnormal operating states cannot be detected. There was a problem that the load could not be reduced.

また、サーミスタ式センサでは、センサが設置されている所定の異常水位に到達するまで検出できないため、連続的な水位データを得ることができず、異常運転状態の兆候を早期に発見することができないという課題があった。 In addition, the thermistor type sensor cannot detect until it reaches a predetermined abnormal water level where the sensor is installed, so it cannot obtain continuous water level data and cannot detect signs of abnormal operation at an early stage. There was a problem.

また、超音波式センサにより検出された初期水位を基準として、所定の水位差によりドレンポンプの運転制御を行っているため、空気調和機の機種やドレンパンサイズ変更やドレンポンプの設置位置変更に対する汎用性がなく、例えば初期水位が高い場合やドレンパンの底面積が大きい場合には、ドレン量が多くても水位差は小さくなり、水漏れの危険性を予測できないという課題があった。 In addition, since the drain pump is controlled by a predetermined water level difference based on the initial water level detected by the ultrasonic sensor, it can be used as a general purpose for changing the air conditioner model, drain pan size, and drain pump installation position. For example, when the initial water level is high or the bottom area of the drain pan is large, there is a problem that even if the drain amount is large, the water level difference becomes small and the risk of water leakage cannot be predicted.

また、ビル用マルチエアコンのように室内機が複数台接続され、ドレン配管を共有している場合、ドレン配管の施工不良あるいは配管詰り発生時に他の室内機からのドレン浸入による水漏れの危険性を予測できないという課題があった。 In addition, when multiple indoor units are connected and the drain pipe is shared like multi air conditioners for buildings, there is a risk of water leakage due to drain intrusion from other indoor units when drain pipe construction failure or pipe clogging occurs. There was a problem that could not be predicted.

この発明は、上述のような課題を解決するためになされたものであり、ドレンパン上方あるいはドレンパン外壁側面に、ドレンの連続的な水位変化を検出できる水位センサを備え、ドレンの過渡的な水位変化を測定し、空気調和機の機種や空調負荷を反映させたうえで、水位定常値、水位変化速度、ドレンポンプ停止直後の水位変化量、ドレンポンプ停止時の水位変化、ドレンポンプの稼動状態などの特徴量を正常運転時の値と比較することにより、ドレンポンプ故障、ドレン配管詰り、ドレンパン内のゴミ堆積、ドレン配管を共有する他の室内機からのドレン浸入などのドレンパンの水漏れに至る各種異常運転状態を判別し、サービス点検作業の負荷低減を目的とする。 The present invention has been made to solve the above-described problems, and is provided with a water level sensor capable of detecting a continuous water level change on the drain pan or on the side wall of the drain pan, and a transient water level change of the drain. After reflecting the air conditioner model and air conditioning load, the water level steady value, the water level change rate, the water level change immediately after the drain pump stops, the water level change when the drain pump stops, the drain pump operating status, etc. Compared with the value of normal operation, the drain pump malfunctions, the drain pipe is clogged, the dust is accumulated in the drain pan, and the drain pan leaks from other indoor units that share the drain pipe. The purpose is to identify various abnormal operating conditions and reduce the load of service inspection work.

この発明は、ドレンの連続的な水位変化を検出できる水位センサを備え、ドレンの過渡的な水位変化を測定できるため、各種異常運転状態の兆候を予測し、異常運転状態の早期発見し、ドレンパンからの水漏れを防止することを目的とする。 The present invention includes a water level sensor capable of detecting a continuous water level change of the drain, and can measure a transient water level change of the drain. Therefore, the present invention predicts various abnormal operation state signs, detects an abnormal operation state early, The purpose is to prevent water leakage.

この発明は、室内機の機種やドレンパンサイズ変更やドレンポンプの設置位置変更に対しても対応可能であり、ドレンの水漏れの異常運転状態の検知において汎用性の高いアルゴリズムを提供することを目的とする。 It is an object of the present invention to provide a highly versatile algorithm for detecting an abnormal operation state of a drain water leak, which can cope with a change in the indoor unit model, drain pan size change and drain pump installation position change. And

この発明は、室内機が複数台接続され、ドレン配管を共有している場合でも、ドレン配管の施工不良あるいは配管詰り発生時に他の室内機からのドレン浸入による水漏れの危険性を事前に予知し、異常運転状態の判別を目的とする。 This invention predicts in advance the risk of water leakage due to drain intrusion from other indoor units when drain pipes are faulty or pipe clogging occurs even when multiple indoor units are connected and share the drain pipe. The purpose is to determine abnormal operating conditions.

本発明の空気調和機は、複数の室内機と、少なくとも１台の室外機からなり、室内機は、熱交換器と、熱交換器に空気を送り熱交換させるための送風手段と、熱交換器から生成されるドレンを受けるためのドレンパンと、ドレンパンに滞留したドレンを室内機外部へ排出するためのドレン排出手段と、ドレン排出手段によって排出されたドレンを室外に運ぶドレン配管と、ドレンの水位の連続的な変化を検出する水位検出手段と、送風手段の送風量を検出する送風機送風量検出手段と、熱交換器に流入する吸込空気の温度を検出する吸込空気温度センサと、熱交換器に流入する吸込空気の湿度を検出する吸込空気湿度センサと、熱交換器を通過した吹出空気の吹出空気温度を検出する吹出空気温度センサと、熱交換器を通過した吹出空気の湿度を検出する吹出空気湿度センサと、送風機送風量検出手段の出力と、吸込空気温度センサの出力と、吸込空気湿度センサの出力と、吹出空気温度センサの出力と、吹出空気湿度センサの出力と、を除湿量算出用データとして取り込むとともにドレン排出手段の稼動状態と、水位センサの出力を取り込む測定部と、複数の異常運転状態を判定する判定部と、警報手段と、を備え、判定部は、測定部が取り込んだ除湿量算出用データに基づいて第１の水位上昇速度を算出し、さらに測定部が取り込んだ水位センサーの出力の所定時間における上昇量から第２の水位上昇速度を算出し、冷房運転時もしくは除湿運転時、判定部は学習・記憶した正常運転時の値と比較し、凝縮水の発生時以降で水位がドレン排出手段の吸込口の位置に至るまでは、第１の水位上昇速度よりも、第２の水位上昇速度が大きい場合、判定部は、ドレン配管の施工不良による、ドレン配管を共有する他の室内機からドレン浸入の異常であると判別し、水位がドレン排出手段の吸込口の位置に到達以降、第２の水位上昇速度が、第１の水位上昇速度よりも小さい場合、判定部は、ドレン配管の配管詰まりの異常であると判別し、水位が前記ドレン排出手段の吸込口の位置以上となり、第２の水位上昇速度と、第１の水位上昇速度がほぼ等しければ、前記ドレン排水手段が故障したと判別し、その旨の警報を警報手段に発報するものである。
The air conditioner of the present invention includes a plurality of indoor units and at least one outdoor unit. The indoor unit includes a heat exchanger, a blowing unit for sending air to the heat exchanger to exchange heat, and heat exchange. A drain pan for receiving the drain generated from the vessel, a drain discharge means for discharging the drain accumulated in the drain pan to the outside of the indoor unit, a drain pipe for transporting the drain discharged by the drain discharge means to the outside, A water level detecting means for detecting a continuous change in the water level, a blower air volume detecting means for detecting the air volume of the air blowing means, an intake air temperature sensor for detecting the temperature of the intake air flowing into the heat exchanger, and heat exchange Suction air humidity sensor that detects the humidity of the suction air that flows into the heat exchanger, a blown air temperature sensor that detects the temperature of the blown air that has passed through the heat exchanger, and the humidity of the blown air that has passed through the heat exchanger The output of the blower air humidity sensor, the output of the blower air flow detection means, the output of the suction air temperature sensor, the output of the suction air humidity sensor, the output of the blow air temperature sensor, the output of the blow air humidity sensor, and the operating state of the drainage means fetches a dehumidification amount calculation data, comprising: a measuring unit for capturing an output of the water level sensor, a determination unit a plurality of abnormal operating conditions, and warning means, a judgment unit The first water level rise rate is calculated based on the dehumidification amount calculation data taken in by the measurement unit, and the second water level rise rate is calculated from the rise amount in the predetermined time of the output of the water level sensor taken in by the measurement unit. During cooling operation or dehumidifying operation, the judgment unit compares it with the value learned and stored during normal operation, and until the water level reaches the position of the inlet of the drainage means after the occurrence of condensed water, When the second water level rise rate is larger than the water level rise rate of 1, the determination unit determines that the drain intrusion is abnormal from other indoor units sharing the drain pipe due to poor construction of the drain pipe, and the water level When the second water level rise speed is smaller than the first water level rise speed after the water reaches the suction port position of the drain discharge means, the determination unit determines that the drain pipe is clogged and the water level Is greater than or equal to the position of the suction port of the drain discharge means, and if the second water level rise speed is substantially equal to the first water level rise speed, it is determined that the drain drain means has failed, and an alarm to that effect is given as warning means It will be issued to .

この発明は、判定部がドレンパン上方あるいはドレンパン外壁側面に、ドレンの連続的な水位変化を検出する水位センサからの水位データと、ドレン排出手段の稼動状態とを、正常運転時と比較することによって、少なくとも１種類の異常運転状態の発生を判定するので、異常運転状態を早期に発見し、サービス点検作業の負荷低減に資することができるという効果がある。 In the present invention, the determination unit compares the water level data from the water level sensor that detects the continuous water level change of the drain and the operating state of the drain discharge means on the drain pan upper side or the drain pan outer wall side surface with the normal operation. Since the occurrence of at least one kind of abnormal operation state is determined, there is an effect that the abnormal operation state can be detected early and contribute to reducing the load of service inspection work.

実施の形態１．
図１は、本発明の実施の形態における、ドレンパン内の異常運転状態を検出する装置を付加した空気調和機の構成図である。室内機１の内部には、ドレンパン２と、ドレン排出手段３と、室内機熱交換器４と、送風機７と、ドレンパン２の内部上方には水位センサ８ａが設置されている。ドレン排出手段３によって排水されたドレンは、ドレン配管９内を流れ室内機外部に送られる。ドレンパン２内にはドレン５が滞留し、ドレン５は室内熱交換器４から凝縮滴下する凝縮水６の分だけ増加し、ドレン排出手段３による排水分だけ減少する。また、ドレン排出手段３の稼動状態と、水位センサ８ａによって検出された値を測定する測定部１０１が、ドレンパン２の外部に設けられ、測定部のデータより空気調和機のドレンパン内の水位が正常運転状態か異常運転状態かを判定する判定部１０２が設けられている。なお、測定部１０１と判定部１０２を離れた位置に設置し、有線、または無線で接続しても良い。また、データ測定部１０１と判定部１０２とを前記空気調和機に隣接した位置に設置しても良い。
また、判定部１０２は、室内機のマイコンで構成される。 Embodiment 1 FIG.
FIG. 1 is a configuration diagram of an air conditioner to which an apparatus for detecting an abnormal operation state in a drain pan is added according to an embodiment of the present invention. Inside the indoor unit 1, a drain pan 2, a drain discharge means 3, an indoor unit heat exchanger 4, a blower 7, and a water level sensor 8 a are installed above the drain pan 2. Drain drained by the drain discharge means 3 flows through the drain pipe 9 and is sent to the outside of the indoor unit. The drain 5 stays in the drain pan 2, and the drain 5 increases by the amount of condensed water 6 condensed and dropped from the indoor heat exchanger 4, and decreases by the amount of drainage by the drain discharge means 3. In addition, a measuring unit 101 that measures the operating state of the drain discharge means 3 and the value detected by the water level sensor 8a is provided outside the drain pan 2, and the water level in the drain pan of the air conditioner is normal from the data of the measuring unit. A determination unit 102 that determines whether the operation state is an abnormal operation state is provided. Note that the measurement unit 101 and the determination unit 102 may be installed at positions separated from each other and connected by wire or wirelessly. Moreover, you may install the data measurement part 101 and the determination part 102 in the position adjacent to the said air conditioner.
Moreover, the determination part 102 is comprised with the microcomputer of an indoor unit.

次に、動作の一例について説明する。室内機１が冷房運転を開始し、室内熱交換器４の表面温度が吸込空気の露点温度以下になると、凝縮水６が発生し、ドレンパン２内にドレン５が滞留する。さらに、ドレン５の水位がドレン排出手段３の吸込口以上の高さになると、ドレン５はドレン排出手段３によって排水され、ドレン排水１４の分だけ減少するため、ドレン５の水位が時々刻々変化することになる。図１のように、ドレンパン２の内部上方に非接触式の水位センサ８ａとして、例えば、超音波式の距離センサを設置し、測定部１０１と有線または無線にて接続することにより、凝縮水６とドレン排水１４のバランスによって変化するドレン５の過渡的な水位データを取得することが可能となる。 Next, an example of the operation will be described. When the indoor unit 1 starts the cooling operation and the surface temperature of the indoor heat exchanger 4 becomes equal to or lower than the dew point temperature of the intake air, condensed water 6 is generated and the drain 5 stays in the drain pan 2. Further, when the water level of the drain 5 becomes higher than the suction port of the drain discharging means 3, the drain 5 is drained by the drain discharging means 3 and decreases by the amount of the drain drain 14, so the water level of the drain 5 changes every moment. Will do. As shown in FIG. 1, for example, an ultrasonic distance sensor is installed as a non-contact type water level sensor 8 a in the upper part of the drain pan 2, and the condensed water 6 is connected to the measurement unit 101 by wire or wirelessly. And it becomes possible to acquire the transient water level data of the drain 5 that changes depending on the balance of the drainage 14.

また、図２のように、水位センサ８ｂとして、例えば、対象物体の静電容量を検出するセンサをドレンパン２の外壁側面に設置し、水と空気の静電容量差からドレン５の水位を測定する方法をとってもよい。この場合、過渡的な水位データを取得できるだけでなく、室内機１の内部を開閉することなく水位センサが設置可能となるため、工事やメンテナンスが容易になる。 Further, as shown in FIG. 2, as the water level sensor 8b, for example, a sensor for detecting the capacitance of the target object is installed on the side of the outer wall of the drain pan 2, and the water level of the drain 5 is measured from the capacitance difference between water and air. You may take the method to do. In this case, not only transient water level data can be acquired, but also a water level sensor can be installed without opening and closing the interior of the indoor unit 1, so that construction and maintenance are facilitated.

次に、本発明の実施の形態１における、水位センサにて検出されるドレンの正常運転状態での水位変化および異常運転状態での水位変化について説明する。 Next, the water level change in the normal operation state and the water level change in the abnormal operation state of the drain detected by the water level sensor in the first embodiment of the present invention will be described.

図５は、室内機１の冷房運転もしくは除湿運転時のドレンパン２内の水位の正常運転状態の水位変化（Ｄ１）を示したものである。正常運転時は、室内機１の冷房運転開始時（ｔ０）は、凝縮水６が発生しないため、水位はドレンパン底面の位置Ｈ０からしばらく変化しないが、室内熱交換器４の表面温度が吸込空気の露点温度以下になり凝縮水６が発生すると上昇を開始する（ｔ１）。水位上昇に伴い、ドレン排出手段３の吸込口の位置Ｈ１にドレン５が到達する（ｔ２）。その後、ドレン排出手段３のエア噛みが改善され、水位が上昇から低下に転じ、凝縮水６とドレン排水１４の量とが平衡状態になるため、水位は排水手段３の吸込口の位置Ｈ１から変化しなくなる（ｔ３）。室内機１の運転が停止し（ｔ４）、その後、所定運転時間ドレン排出手段３は稼動しているため水位は変化していないが、ドレン排出手段３が停止すると、ドレン配管９に滞留していたドレンがドレンパン２内に逆流してくるため水位はＨ２の位置まで上昇する（ｔ５）。ここで、ドレン排出手段３停止時の水位変化量をΔＨｂとすると、
ΔＨｂ＝Ｈ２−Ｈ１
となる。また、室内機１が長期間運転を停止して室内機熱交換器４からの凝縮水６の発生がなくなり、ドレンパン２内のドレン５が徐々に蒸発すると、最終的には水位Ｈ０まで低下する。 FIG. 5 shows the water level change (D1) in the normal operation state of the water level in the drain pan 2 during the cooling operation or the dehumidifying operation of the indoor unit 1. During normal operation, when the cooling operation of the indoor unit 1 is started (t0), since the condensed water 6 is not generated, the water level does not change for a while from the position H0 on the drain pan bottom, but the surface temperature of the indoor heat exchanger 4 is the intake air. When the condensed water 6 is generated below the dew point temperature, the rise starts (t1). As the water level rises, the drain 5 reaches the suction port position H1 of the drain discharge means 3 (t2). Thereafter, the air biting of the drain discharge means 3 is improved, the water level changes from rising to lowering, and the amount of the condensed water 6 and the drain drainage 14 is in an equilibrium state, so that the water level starts from the inlet position H1 of the draining means 3. No change (t3). The operation of the indoor unit 1 is stopped (t4), and then the water level does not change because the drain discharge means 3 is operating for a predetermined operation time. However, when the drain discharge means 3 stops, it remains in the drain pipe 9. Since the drain flows back into the drain pan 2, the water level rises to the position of H2 (t5). Here, when the water level change amount when the drain discharge means 3 is stopped is ΔHb,
ΔHb = H2−H1
It becomes. Moreover, when the indoor unit 1 stops operation for a long time, the generation of the condensed water 6 from the indoor unit heat exchanger 4 disappears, and the drain 5 in the drain pan 2 gradually evaporates, eventually lowers to the water level H0. .

図６に、室内機１の冷房運転もしくは除湿運転時のドレンパン２内のドレン排出手段３故障時の水位変化（Ｄ２）を示す。このとき、ドレン５の水位Ｈが、ドレン排出手段３の吸込口位置Ｈ１に到達（ｔ２）以降も、水位が上昇し続ける。また、ドレン配管９が詰っている場合も同様の水位変化の傾向となるため、ドレン排出手段が稼動している状態で、ドレン排出手段３の吸込口位置Ｈ１を超えて、現在の水位Ｈが増加する場合は、ドレン排出手段３故障もしくは、ドレン配管詰まりとして異常運転状態を検出・判別することができる。 FIG. 6 shows a change in water level (D2) when the drain discharge means 3 in the drain pan 2 fails during the cooling operation or the dehumidifying operation of the indoor unit 1. At this time, the water level continues to rise even after the water level H of the drain 5 reaches the suction port position H1 of the drain discharge means 3 (t2). Further, when the drain pipe 9 is clogged, the same water level change tends to occur, so that the current water level H exceeds the suction port position H1 of the drain discharge means 3 while the drain discharge means is operating. In the case of increase, it is possible to detect / determine the abnormal operation state as the drain discharge means 3 is broken or the drain pipe is clogged.

初期の正常運転状態時に、室内機１が冷房運転もしくは除湿運転にて十分運転され、水位がドレン排出手段の吸込口Ｈ１まで到達し、水位が定常値になったことが確認されれば、その値をＨ１として学習・記憶することで、室内機１の機種、ドレンパン２の構造によらず、ドレン排出手段の吸込口位置を決定することができる。もちろん、ドレンパン底面に対して、ドレン排出手段の吸込口を所定の位置に設置することを規定すれば、Ｈ１は学習・記憶する必要はなくあらかじめ値を記憶保持しておけばよい。 If it is confirmed that the indoor unit 1 is sufficiently operated in the cooling operation or the dehumidifying operation in the initial normal operation state, the water level reaches the suction port H1 of the drain discharge means, and the water level becomes a steady value, By learning and storing the value as H1, the inlet position of the drain discharge means can be determined regardless of the model of the indoor unit 1 and the structure of the drain pan 2. Of course, if it is defined that the suction port of the drain discharge means is installed at a predetermined position with respect to the bottom surface of the drain pan, H1 does not need to be learned and stored, and the value may be stored and held in advance.

図７は、室内機１の冷房運転もしくは除湿運転時のドレンパン２内にゴミが堆積し堰が形成されている場合の水位変化（Ｄ３）を示したものである。ドレンパン２内にゴミが堆積している場合には、ドレン排出手段３運転時は、図５の正常運転時の水位変化と変わらないが、室内機１の運転が停止し（ｔ４）、その後、ドレン排出手段３が停止することでドレン配管９に滞留していたドレンが逆流してくる際（ｔ５）のドレン排出手段停止直後の水位変化量ΔＨｂが正常運転状態に比較し大きいという特徴がある。これは、ドレンパン内２にゴミが堆積し、堰が形成されることで、ドレンパン２のドレン５が滞留している占有面積が小さくなるため、ドレン排出手段３停止時に、ドレン配管９より、正常運転状態と同量のドレンが逆流してきた場合、ドレン排出手段３停止直後の水位Ｈ２が正常運転状態でのドレン排出手段３停止直後の水位Ｈ２に対して上昇するためである。また、ドレン配管９が詰っている場合も、ドレン排水手段３によってドレン配管９内に滞留するドレン量が増加するため、同様の水位変化の傾向となるため、ドレン排出手段３停止直後の水位変化量ΔＨｂを正常運転状態の時に学習・記憶しておけば、ΔＨｂが正常運転状態の時のΔＨｂより増加した場合には、ドレンパン２内のゴミ堆積またはドレン配管詰まりとして異常運転状態を検出・判別することができる。 FIG. 7 shows a change in water level (D3) when dust accumulates in the drain pan 2 and a weir is formed during the cooling operation or dehumidifying operation of the indoor unit 1. When dust is accumulated in the drain pan 2, the operation of the indoor unit 1 is stopped (t4) after the drain discharge means 3 operation is not changed from the water level change in the normal operation of FIG. When the drain discharge means 3 stops and the drain staying in the drain pipe 9 flows backward (t5), the water level change amount ΔHb immediately after the drain discharge means stops is larger than that in the normal operation state. . This is because dust is accumulated in the drain pan 2 and a weir is formed, so that the occupied area in which the drain 5 of the drain pan 2 is retained becomes smaller. Therefore, when the drain discharge means 3 is stopped, the drain pipe 9 is normal. This is because when the same amount of drain as in the operating state flows backward, the water level H2 immediately after stopping the drain discharging means 3 rises with respect to the water level H2 immediately after stopping the drain discharging means 3 in the normal operating state. Further, when the drain pipe 9 is clogged, the amount of drain staying in the drain pipe 9 is increased by the drain draining means 3, so that the same water level change tendency is caused. Therefore, the water level change immediately after the drain discharge means 3 stops. If the amount ΔHb is learned and stored in the normal operation state, if ΔHb increases from the ΔHb in the normal operation state, the abnormal operation state is detected and discriminated as dust accumulation in the drain pan 2 or drain pipe clogging. can do.

図８は、室内機１の運転停止時において、ドレン配管９の施工不良により、ドレン配管９を共有する他の室内機からのドレンが浸入する場合の水位変化（Ｄ４）を示したものである。この時、ドレン排出手段３が稼動している間は、正常運転時の水位変化（Ｄ１）と同様の変化をするが（ｔ５）、ドレン排出手段３停止後は、ドレン配管９の施工不良により、ドレン配管９を共有する他の室内機からドレンが浸入するため、徐々に水位が上昇してくる。したがって、ドレン排出手段３停止時のドレン５の水位変化を図５の正常時のそれと比較することで、異常運転状態を検出・判別することができる。 FIG. 8 shows a change in water level (D4) when drain from other indoor units sharing the drain pipe 9 enters due to poor construction of the drain pipe 9 when the operation of the indoor unit 1 is stopped. . At this time, while the drain discharge means 3 is operating, the change is the same as the water level change (D1) during normal operation (t5), but after the drain discharge means 3 stops, Since the drain enters from other indoor units sharing the drain pipe 9, the water level gradually rises. Therefore, the abnormal operation state can be detected and determined by comparing the water level change of the drain 5 when the drain discharge means 3 is stopped with that in the normal state of FIG.

以上のように、時系列測定可能な水位センサによって取得された、ドレン５の過渡的な水位データから抽出される、ドレン排出手段３の吸込口到達後の水位定常値Ｈ１、ドレン排出手段３停止直後の水位変化量ΔＨｂ、ドレン排出手段３停止時の水位及び水位変化などの特徴量が各種異常運転状態毎に異なるため、これらの特徴量を、１つないし２つ以上組み合わせ、正常運転状態の値と比較することにより、各種異常運転状態を検出・判別することが可能となる。 As described above, the water level steady value H1 after reaching the suction port of the drain discharging means 3 and the drain discharging means 3 stopped, which are extracted from the transient water level data of the drain 5 obtained by the water level sensor capable of time series measurement. Since the feature amount such as the water level change amount ΔHb immediately after the drain discharge means 3 stops and the water level change varies depending on various abnormal operation states, these feature amounts are combined in one or two or more to obtain the normal operation state. By comparing with the value, it becomes possible to detect and discriminate various abnormal operation states.

次に、本発明の実施の形態１における、ドレンパン内の異常運転状態を検出するアルゴリズムの概略フローチャートを図１１に示す。装置の構成としては、図１、または図２と同様であり、測定部１０１によって処理されたデータを用いて判定部１０２にて、ドレンパン内の水位変化から各種異常運転状態を特定・判別するものである。 Next, FIG. 11 shows a schematic flowchart of an algorithm for detecting an abnormal operation state in the drain pan in the first embodiment of the present invention. The configuration of the apparatus is the same as in FIG. 1 or FIG. 2, and the determination unit 102 uses the data processed by the measurement unit 101 to identify and determine various abnormal operation states from the water level change in the drain pan. It is.

まず、判定部１０２は、水位センサ８ａもしくは８ｂによって測定される水位データ、ドレン排出手段３の稼動状態のデータを取り込む（ＳＴ２）。次に、判定部１０２は、ドレン排出手段３が稼動しているかどうかを判定する（ＳＴ３）。稼動しているならば、水位定常値となる、ドレン排出手段吸込口水位Ｈ１を既に学習・記憶済みであるか否かを判定する（ＳＴ４）。未だ学習・記憶していなければ、ドレン排出手段吸込口水位Ｈ１を水位が定常となった状態で学習・記憶し（ＳＴ５）、分岐（ＳＴ８）に入る、既に学習・記憶していれば、判定部１０２は、現在の水位Ｈがドレン排出手段吸込口水位Ｈ１よりも低い正常水位であるか否かを判定する（ＳＴ６）。ドレン排出手段吸込口水位Ｈ１以下であれば分岐（ＳＴ８）に入り、ドレン排出手段吸込口水位Ｈ１より大きければ、ドレン排出手段３の排出能力が正常状態よりも低下していることを意味するので、判定部１０２は、ドレン排出手段３故障もしくはドレン配管９詰りであると判定し警報手段（図示せず）に警報を発報させる（ＳＴ７）。 First, the determination unit 102 takes in water level data measured by the water level sensor 8a or 8b and data on the operating state of the drain discharge means 3 (ST2). Next, the determination part 102 determines whether the drain discharge means 3 is operating (ST3). If it is operating, it is determined whether or not the drain discharge means suction port water level H1 that is the steady water level value has already been learned and stored (ST4). If not yet learned and memorized, drain drain means inlet water level H1 is learned and memorized in a state where the water level is steady (ST5), and enters branch (ST8). The unit 102 determines whether or not the current water level H is a normal water level lower than the drain discharge means inlet water level H1 (ST6). If it is less than the drain discharge means suction port water level H1, it enters the branch (ST8), and if it is greater than the drain discharge means suction port water level H1, it means that the discharge capacity of the drain discharge means 3 is lower than the normal state. The determination unit 102 determines that the drain discharge means 3 is broken or the drain pipe 9 is clogged, and causes an alarm means (not shown) to issue an alarm (ST7).

また、分岐（ＳＴ３）でドレン排出手段３が稼動していないと判定された場合、判定部１０２は、ドレン排出手段３停止直後の水位変化量ΔＨｂの正常値を既に学習・記憶しているか否かを判定する（ＳＴ１０）。未だ学習・記憶していなければ、判定部１０２は、ドレン排出手段３停止直後の水位変化量ΔＨｂの正常値を学習・記憶し（Ｓ１１）、分岐（ＳＴ１４）に入る。 When it is determined that the drain discharge unit 3 is not operating at the branch (ST3), the determination unit 102 has already learned and stored the normal value of the water level change amount ΔHb immediately after the drain discharge unit 3 is stopped. Is determined (ST10). If not yet learned / stored, the determination unit 102 learns / stores the normal value of the water level change amount ΔHb immediately after the drain discharge means 3 stops (S11), and enters the branch (ST14).

正常時のΔＨｂを既に学習・記憶していれば、判定部１０２は、現在のドレン排出手段３停止直後の水位変化量ΔＨｂを正常時の値と比較し（ＳＴ１２）、正常値とほぼ同程度もしくはそれ以下であれば正常状態と判定し、分岐（ＳＴ１４）に入り、そうでなければドレンパン内ゴミ堆積、もしくはドレン配管詰りと判定し、警報手段（図示せず）に警報を発報させ（ＳＴ１３）、分岐（ＳＴ１４）に入る。 If the normal ΔHb has already been learned and stored, the determination unit 102 compares the current level change ΔHb immediately after stopping the drain discharge means 3 with the normal value (ST12), and is approximately the same as the normal value. Or, if it is less than that, it is determined as normal and enters branch (ST14). Otherwise, it is determined that dust is accumulated in the drain pan or the drain pipe is clogged, and an alarm means (not shown) issues an alarm ( ST13), branch (ST14) is entered.

判定部１０２は、分岐（ＳＴ１４）において、ドレン排出手段が稼動していない状態、つまり冷房や除湿運転により除湿が行われず凝縮水６がほとんどない状態で、水位の上昇が測定されるか否かを判定し、水位の上昇が測定された場合は、ドレン配管を共有する他の室内機からのドレン浸入と判定し警報手段（図示せず）に警報を発報させ（ＳＴ１５）、分岐（ＳＴ８）に入る。 In the branch (ST14), the determination unit 102 determines whether or not the rise in the water level is measured in a state where the drain discharge means is not operating, that is, in a state where the dehumidification is not performed by cooling or dehumidifying operation and there is almost no condensed water 6. If the rise in the water level is measured, it is determined that the drain has entered from another indoor unit sharing the drain pipe, and an alarm means (not shown) issues an alarm (ST15) and branches (ST8). )to go into.

判定部１０２は、分岐（ＳＴ８）において、ドレンパンの水漏れに至る位置よりも所定量の低い位置に危険水位を設定し、その危険水位と現在の水位を比較し、危険水位に達していたら警報手段（図示せず）に警報を発報させる（ＳＴ９）ことで、各種異常運転状態の検知漏れに対応することができる。 In branch (ST8), determination unit 102 sets a critical water level at a position that is a predetermined amount lower than the position leading to drain pan water leakage, compares the critical water level with the current water level, and alerts if the critical water level has been reached. By causing a means (not shown) to issue an alarm (ST9), it is possible to cope with a detection failure of various abnormal operation states.

また、上記に示した警報については、その水位のレベル毎に判定閾値を設け、警報の大小により、現在の異常度合いを示す形にしてもよい。 Moreover, about the warning shown above, the determination threshold value may be provided for every level of the water level, and you may make it the form which shows the present abnormality degree by the magnitude of a warning.

以上のように、時系列測定可能な水位センサによって取得された、ドレン５の過渡的な水位データから抽出される、ドレン排出手段３の吸込口到達後の水位定常値Ｈ１、ドレン排出手段３停止直後の水位変化量ΔＨｂ、ドレン排出手段３停止時の水位が各種異常運転状態において異なるため、判定部１０２は、これらの値を、正常運転状態の値と比較することにより、各種異常運転状態を検出・判別することができ、サービス点検作業の負荷の低減および異常原因を特定することが可能となる。 As described above, the water level steady value H1 after reaching the suction port of the drain discharging means 3 and the drain discharging means 3 stopped, which are extracted from the transient water level data of the drain 5 obtained by the water level sensor capable of time series measurement. Since the water level change amount ΔHb immediately after and the water level at the time of stopping the drain discharge means 3 are different in various abnormal operation states, the determination unit 102 compares these values with the values in the normal operation state, thereby determining various abnormal operation states. It is possible to detect and discriminate, and to reduce the load of service inspection work and to identify the cause of the abnormality.

実施の形態２．
図３は、本発明の実施の形態２における、ドレンパン内の異常運転状態を検出する装置を付加した空気調和機の概略構成図である。室内機１の内部には、ドレンパン２と、ドレン排出手段３と、室内機熱交換器４と、送風機７と、送風機送風量検出手段７ａと、ドレンパン２の内部上方には水位センサ８ａと、室内熱交換器４に流入する吸込空気の温度（以下、吸込空気温度と称する）を検出する吸込空気温度センサ１０と、室内熱交換器４に流入する吸込空気の湿度（以下、吸込空気湿度と称する）を検出する吸込空気湿度センサ１１と、室内熱交換器４を通過した吹出空気の温度（以下、吹出空気温度と称する）を検出する吹出空気温度センサ１２と、室内熱交換器４を通過した吹出空気の湿度（以下、吹出空気湿度と称する）を検出する吹出空気湿度センサ１３が設置されている。ドレン排出手段３によって排水されたドレンは、ドレン配管９内を流れ室内機外部に送られる。ドレンパン２内にはドレン５が滞留し、ドレン５は室内熱交換器４から凝縮滴下する凝縮水６の分だけ増加し、ドレン排出手段３による排水分だけ減少する。また、吸込空気温度センサ１０によって検出された吸込空気温度と、吸込空気湿度センサ１１によって検出された吸込空気湿度と、吹出空気温度センサ１２によって検出された吹出空気温度と、吹出空気湿度センサ１３によって検出された吹出空気湿度と、ドレン排出手段３の稼動状態と、水位センサ８ａによって検出された水位データを処理する測定部１０１が、ドレンパン２の外部に設けられ、測定部１０１のデータより空気調和機のドレンパン内の水位が正常運転状態か異常運転状態かを判定する判定部１０２がドレンパン２の外部に設けられている。なお、測定部１０１と判定部１０２を離れた位置に設置し、有線、または無線で接続しても良い。また、データ測定部１０１と判定部１０２とを前記空気調和機に隣接した位置に設置しても良い。 Embodiment 2. FIG.
FIG. 3 is a schematic configuration diagram of an air conditioner to which an apparatus for detecting an abnormal operation state in the drain pan is added in Embodiment 2 of the present invention. Inside the indoor unit 1, there are a drain pan 2, a drain discharge means 3, an indoor unit heat exchanger 4, a blower 7, a blower air volume detection means 7 a, a water level sensor 8 a above the drain pan 2, An intake air temperature sensor 10 that detects the temperature of the intake air flowing into the indoor heat exchanger 4 (hereinafter referred to as intake air temperature), and the humidity of the intake air that flows into the indoor heat exchanger 4 (hereinafter referred to as intake air humidity) The intake air humidity sensor 11 that detects the temperature of the blown air, the temperature of the blown air that has passed through the indoor heat exchanger 4 (hereinafter referred to as the blown air temperature), and the indoor heat exchanger 4 A blown air humidity sensor 13 for detecting the humidity of the blown air (hereinafter referred to as blown air humidity) is installed. Drain drained by the drain discharge means 3 flows through the drain pipe 9 and is sent to the outside of the indoor unit. The drain 5 stays in the drain pan 2, and the drain 5 increases by the amount of condensed water 6 condensed and dropped from the indoor heat exchanger 4, and decreases by the amount of drainage by the drain discharge means 3. Further, the suction air temperature detected by the suction air temperature sensor 10, the suction air humidity detected by the suction air humidity sensor 11, the blown air temperature detected by the blown air temperature sensor 12, and the blown air humidity sensor 13 A measurement unit 101 for processing the detected blown air humidity, the operating state of the drain discharge means 3, and the water level data detected by the water level sensor 8 a is provided outside the drain pan 2. A determination unit 102 for determining whether the water level in the drain pan of the machine is in a normal operation state or an abnormal operation state is provided outside the drain pan 2. Note that the measurement unit 101 and the determination unit 102 may be installed at positions separated from each other and connected by wire or wirelessly. Moreover, you may install the data measurement part 101 and the determination part 102 in the position adjacent to the said air conditioner.

また、前記送風機風量検出手段７ａは、例えば、送風機７のファン回転数を検出する方法でもよく、風速を検出する風速センサでもよく、室内熱交換器４の空気の流路の前後の差圧を測定し、差圧から風量を推測する方法でもよい。また、前記送付機７の風量が一定である場合または、室内機の運転情報から設定風量が得られる場合には、送風機風量検出手段７ａは必要ないため、コスト低減となる。 The blower air volume detection means 7a may be, for example, a method for detecting the fan rotation speed of the blower 7 or a wind speed sensor for detecting the wind speed, and the differential pressure before and after the air flow path of the indoor heat exchanger 4 is measured. A method of measuring and estimating the air volume from the differential pressure may be used. Further, when the air flow rate of the sending device 7 is constant or when the set air flow rate is obtained from the operation information of the indoor unit, the blower air flow rate detecting means 7a is not necessary, so that the cost is reduced.

正常運転状態と各種異常運転状態での水位変化は、図１に示した構成図での水位変化と同じであるが、室内熱交換器４通過後の空気の状態の変化を測定できるため、より検知精度の高い異常原因の判別が可能となる。以下に、その方法について述べる。 Although the water level change in the normal operation state and various abnormal operation states is the same as the water level change in the configuration diagram shown in FIG. 1, the change in the air state after passing through the indoor heat exchanger 4 can be measured. It is possible to determine the cause of the abnormality with high detection accuracy. The method will be described below.

図９は、図５と同様に、室内機１の冷房運転もしくは除湿運転時のドレンパン２内の正常運転状態の水位変化（Ｄ５）を示したものであるが、図９は室内機１の吸込空気の湿度が図５の時の吸込空気の湿度に対して低いため、除湿量が小さい。そのため、図５でのドレンパン底面の位置Ｈ０からドレンポンプ吸込口の水位Ｈ１にいたる過程での水位変化（Ｄ１）より算出される水位上昇速度に対して、図９でのドレンパン底面の位置Ｈ０からドレンポンプ吸込口の水位Ｈ１にいたる過程での水位変化（Ｄ５）より算出される水位上昇速度が小さくなっていることがわかる。 FIG. 9 shows the water level change (D5) in the normal operation state in the drain pan 2 during the cooling operation or the dehumidifying operation of the indoor unit 1 as in FIG. Since the humidity of the air is lower than the humidity of the intake air at the time of FIG. 5, the dehumidification amount is small. Therefore, from the position H0 of the drain pan bottom in FIG. 9 to the water level rising speed calculated from the water level change (D1) in the process from the position H0 of the drain pan bottom in FIG. 5 to the water level H1 of the drain pump suction port. It can be seen that the water level rising speed calculated from the water level change (D5) in the process leading to the water level H1 of the drain pump suction port is small.

ここで、ドレンパン２内の水位変化と室内機１の除湿量の関係について説明する。室内機１の室内熱交換器４前後での空気の状態変化から求まる除湿量Ｗａ［ｍ³／ｍｉｎ］は、送風機７の風量Ｇａ［ｍ³／ｍｉｎ］と、吸込空気温度センサ１０によって検出される吸込空気温度Ｔａｉ［℃］と、吸込空気湿度センサ１１によって検出される吸込空気湿度ＲＨａｉ［％］によって演算される吸込空気の絶対湿度ｘａｉ［ｋｇ／ｋｇ'］と、吸込空気の密度ρａｉ［ｋｇ／ｍ³］と、吹出空気センサ１２によって検出される吹出温度Ｔａｏ［℃］と、吹出空気湿度センサ１３によって検出される吹出空気湿度ＲＨａｏ［％］より演算される吹出空気の絶対湿度ｘａｏ［ｋｇ／ｋｇ'］と、吹出空気の密度ρａｏ［ｋｇ／ｍ³］と、ドレン５の密度ρｗ［ｋｇ／ｍ³］によって次式より求めることができる。なお、ドレン５の密度はρｗ［ｋｇ／ｍ³］は水であるため一定値の１０００ｋｇ／ｍ³と仮定してよい。 Here, the relationship between the water level change in the drain pan 2 and the dehumidification amount of the indoor unit 1 will be described. The dehumidification amount Wa [m ³ / min] obtained from the air state change before and after the indoor heat exchanger 4 of the indoor unit 1 is detected by the air amount Ga [m ³ / min] of the blower 7 and the intake air temperature sensor 10. Suction air temperature Tai [° C.], suction air absolute humidity xai [kg / kg ′] calculated by the suction air humidity RHai [%] detected by the suction air humidity sensor 11, and suction air density ρai [ kg / m ³ ], the blown air temperature Tao [° C.] detected by the blown air sensor 12, and the blown air humidity RHao [%] detected by the blown air humidity sensor 13. and kg / kg '], and the density of the air blown ρao [kg / m ^3], can be determined from the following equation by the density of the drain ^{5 ρw [kg / m 3]} . The density of the drain 5 may be assumed to be a constant value of 1000 kg / m ³ because ρw [kg / m ³ ] is water.

また、水位Ｈ［ｍｍ］の水位上昇速度Ｖｄ［ｍ／ｍｉｎ］は、ドレン５の所定時間Δｔ［ｍｉｎ］時間での水位変化量ΔＨから、次式にて求めることができる。 Further, the water level rising speed Vd [m / min] of the water level H [mm] can be obtained from the water level change amount ΔH of the drain 5 at the predetermined time Δt [min] time by the following equation.

ここで、ドレンパン２の底面積をＳｄ［ｍ²］とすると、ドレンパン２の水位上昇速度Ｖｄ［ｍ／ｍｉｎ］より、ドレンパン２の水位変化から求まる除湿量Ｗｄ［ｍ³／ｍｉｎ］は次式にてあらわすことができる。 Here, when the bottom area of the drain pan 2 is Sd [m ² ], the dehumidification amount Wd [m ³ / min] obtained from the water level change of the drain pan 2 from the water level rising speed Vd [m / min] of the drain pan 2 is Can be represented.

ドレンパン２の水位Ｈがドレン排出手段３の吸込口の水位Ｈ１に至るまでは、ドレン排出手段３による排水が行われないため、式（１）より求まる除湿量Ｗａ［ｍ³／ｍｉｎ］と式（３）より求まる除湿量Ｗｄ［ｍ³／ｍｉｎ］の値が等しくなる。ドレンパン２の底面積Ｓｄ［ｍ²］は一定であるため、水位上昇速度Ｖｄと除湿量Ｗａの関係は比例関係となるため、除湿量Ｗａ［ｍ³／ｍｉｎ］が小さい場合には、水位上昇速度Ｖｄ［ｍ／ｍｉｎ］も小さくなることがわかる。 Since drainage by the drain discharge means 3 is not performed until the water level H of the drain pan 2 reaches the water level H1 of the suction port of the drain discharge means 3, the dehumidification amount Wa [m ³ / min] obtained from the formula (1) and the formula The value of the dehumidification amount Wd [m ³ / min] obtained from (3) becomes equal. Since the bottom area Sd [m ² ] of the drain pan 2 is constant, the relationship between the water level rising speed Vd and the dehumidification amount Wa is proportional, so that the water level rises when the dehumidification amount Wa [m ³ / min] is small. It can be seen that the velocity Vd [m / min] is also reduced.

また、この時、除湿量Ｗａ［ｍ³／ｍｉｎ］と除湿量Ｗｄ［ｍ³／ｍｉｎ］が等しい関係が成り立つため、式（１）、式（３）よりドレンパンの底面積Ｓｄ［ｍ²］を推測することができる。この推測された底面積Ｓｄ［ｍ²］の値を測定部９に記憶・保持しておけば、水位上昇速度Ｖｄ［ｍ／ｍｉｎ］より除湿量Ｗｄ［ｍ³／ｍｉｎ］が演算可能となる。 At this time, since the dehumidification amount Wa [m ³ / min] and the dehumidification amount Wd [m ³ / min] are equal, the bottom area Sd [m ² ] of the drain pan is obtained from the equations (1) and (3). Can be guessed. If the estimated value of the bottom area Sd [m ² ] is stored and held in the measurement unit 9, the dehumidification amount Wd [m ³ / min] can be calculated from the water level rising speed Vd [m / min]. .

これにより、室内機１の機種や空調負荷によらず、ドレンパン２の底面積Ｓｄ［ｍ²］を推測できるため、汎用性が高く、同一機種での個体ばらつきを吸収できるため、精度の高い検知が可能となる。 As a result, the bottom area Sd [m ² ] of the drain pan 2 can be estimated regardless of the model of the indoor unit 1 and the air conditioning load. Therefore, the versatility is high and individual variations in the same model can be absorbed. Is possible.

もちろん、ドレンパン２の底面積Ｓｄ［ｍ²］があらかじめわかっている場合には、室内機１の機種に応じて、測定部９にあらかじめ記憶・保持しておき、除湿量Ｗｄ［ｍ³／ｍｉｎ］を水位上昇速度Ｖｄ［ｍ／ｍｉｎ］より直接求めてもよい。このときも同様の効果を得ることができる。 Of course, when the bottom area Sd [m ² ] of the drain pan 2 is known in advance, it is stored and held in advance in the measuring unit 9 according to the model of the indoor unit 1, and the dehumidification amount Wd [m ³ / min. ] May be obtained directly from the water level rising speed Vd [m / min]. At this time, the same effect can be obtained.

なお、式（１）において送風機７の風量Ｇａ［ｍ³／ｍｉｎ］の値が不明である場合には、風量と比例関係にある、風速あるいは、室内熱交換器４の前後差圧でもよく、風量との関係を示す比例定数を固定値とすれば、ドレンパン２の底面積Ｓｄ［ｍ²］を正規化できるため、水位上昇速度Ｖａ［ｍ／ｍｉｎ］、水位上昇速度Ｖｄ［ｍ／ｍｉｎ］を演算することが出来る。 In addition, when the value of the air volume Ga [m ³ / min] of the blower 7 is unknown in the formula (1), it may be a wind speed or a differential pressure across the indoor heat exchanger 4 that is proportional to the air volume, Since the bottom area Sd [m ² ] of the drain pan 2 can be normalized if the proportionality constant indicating the relationship with the air volume is a fixed value, the water level rising speed Va [m / min] and the water level rising speed Vd [m / min] Can be calculated.

ドレンパンの底面積Ｓｄ［ｍ²］が推測できれば、その値を正常運転状態の値として記憶・保持し、室内熱交換器４前後の空気の状態変化より求まる除湿量Ｗａ［ｍ³／ｍｉｎ］より、次の式（４）にてドレンパン２内の水位上昇速度Ｖａ［ｍ／ｍｉｎ］を推測することが可能である。 If the bottom area Sd [m ² ] of the drain pan can be estimated, the value is stored and held as a value of the normal operation state, and the dehumidification amount Wa [m ³ / min] obtained from the change in the state of the air around the indoor heat exchanger 4 The water level rising speed Va [m / min] in the drain pan 2 can be estimated by the following equation (4).

正常運転状態であれば、式（４）の空気の状態変化から求まる水位上昇速度Ｖａ［ｍ／ｍｉｎ］と、式（２）のドレンパン２内の水位変化から求まる水位上昇速度Ｖｄ［ｍ／ｍｉｎ］の値は常に等しくなるが、ドレン配管９の施工不良により、ドレン配管９を共有する他の室内機からドレンがドレンパン２に浸入する場合や、ドレン配管９に詰りが発生している場合などの異常運転状態では、両者の値が異なるため、両者の大小を比較することで、各種異常運転状態を判定することが可能となる。実施の形態１での特徴量に加え、水位変化速度が求まることで異常運転状態の特定をすることが可能となるため、以下に、その方法について説明する。 In the normal operation state, the water level rise speed Va [m / min] obtained from the air state change in Expression (4) and the water level rise speed Vd [m / min] obtained from the water level change in the drain pan 2 in Expression (2). ] Are always equal, but due to poor construction of the drain pipe 9, when the drain enters the drain pan 2 from other indoor units sharing the drain pipe 9, or when the drain pipe 9 is clogged, etc. Since the two values are different in the abnormal operation state, it is possible to determine various abnormal operation states by comparing the two values. Since the abnormal operation state can be specified by obtaining the water level change speed in addition to the feature amount in the first embodiment, the method will be described below.

図１０に、ドレン配管９の施工不良により、ドレン配管９を共有する他の室内機からドレンがドレンパン２内に浸入する場合の水位変化（Ｄ６）を示す。ドレン配管９の施工不良により、ドレン配管９を共有する他の室内機からドレンがドレンパン２内に浸入する場合、凝縮水６の発生時（ｔ１）以降で水位がドレン排出手段３の吸込口の位置Ｈ１に至るまで（ｔ２）は、室内機１の除湿量Ｗａから推測される水位上昇速度Ｖａよりも、水位センサ８ａまたは水位センサ８ｂの水位データより演算される水位上昇速度Ｖｄが大きくなるため、ドレン配管９の施工不良による、ドレン配管９を共有する他の室内機からドレン浸入の異常運転状態を、水位がドレン排出手段３の吸込口の位置Ｈ１に至る前に検出・判別することができる。 FIG. 10 shows the water level change (D6) when drain enters the drain pan 2 from another indoor unit sharing the drain pipe 9 due to poor construction of the drain pipe 9. When drain enters the drain pan 2 from other indoor units sharing the drain pipe 9 due to poor construction of the drain pipe 9, the water level at the inlet of the drain discharge means 3 after the generation of the condensed water 6 (t1). Since the water level rising speed Vd calculated from the water level data of the water level sensor 8a or the water level sensor 8b is larger than the water level rising speed Va estimated from the dehumidification amount Wa of the indoor unit 1 until reaching the position H1 (t2). The abnormal operation state of drain intrusion from other indoor units sharing the drain pipe 9 due to poor construction of the drain pipe 9 can be detected and determined before the water level reaches the suction port position H1 of the drain discharge means 3. it can.

また、図１０に、ドレン配管９の配管詰まり発生時の水位変化（Ｄ７）を示す。ドレン配管９の配管詰まり発生時には、水位がドレン排出手段３の吸込口の位置Ｈ１に到達（ｔ３）以降、室内機１の除湿量Ｗａに対して、ドレン排水１４が小さいため、ドレンパンの水位Ｈが徐々に増加する。このとき、水位データより演算される水位上昇速度Ｖｄは、除湿量Ｗａから推測される水位上昇速度Ｖａよりも小さくなるため、水位上昇速度Ｖｄを水位上昇速度Ｖａと比較することでドレン配管９の配管詰まりとして異常運転状態を検出・判別することができる。 FIG. 10 shows a change in water level (D7) when the drain pipe 9 is clogged. When the drain pipe 9 is clogged, since the drain level is smaller than the dehumidification amount Wa of the indoor unit 1 after the water level reaches the suction port position H1 of the drain discharge means 3 (t3), the drain pan water level H Gradually increases. At this time, since the water level rising speed Vd calculated from the water level data is smaller than the water level rising speed Va estimated from the dehumidification amount Wa, the water level rising speed Vd is compared with the water level rising speed Va, so that the drain pipe 9 Abnormal operation status can be detected and discriminated as clogged piping.

また、水位がドレン排出手段３の吸込口の位置Ｈ１以上となり、水位データより演算される水位上昇速度Ｖｄと、除湿量Ｗａから推測される水位上昇速度Ｖａがほぼ等しければ、ドレン排水手段３が故障として異常運転状態を検出・判別することができる。 Also, if the water level is equal to or higher than the suction port position H1 of the drain discharge means 3, and the water level rise speed Vd calculated from the water level data is substantially equal to the water level rise speed Va estimated from the dehumidification amount Wa, the drain drain means 3 An abnormal operation state can be detected and determined as a failure.

以上のように、時系列測定可能な水位センサによって取得された、ドレン５の過渡的な水位データから抽出される、ドレン排出手段３の吸込口到達後の水位定常値Ｈ１、室内機１の除湿量Ｗａより求まる水位上昇速度Ｖａ、ドレンパン２内の水位変化から求まる水位上昇速度Ｖｄが各種異常運転状態において異なるため、これらを正常運転状態の値と比較することにより、各種異常運転状態を検出・判別することが可能となる。 As described above, the water level steady value H1 after reaching the suction port of the drain discharge means 3 and the dehumidification of the indoor unit 1 extracted from the transient water level data of the drain 5 obtained by the water level sensor capable of time series measurement. Since the water level rise speed Va obtained from the amount Wa and the water level rise speed Vd obtained from the water level change in the drain pan 2 are different in various abnormal operation states, various abnormal operation states are detected by comparing these with the values in the normal operation state. It becomes possible to discriminate.

次に、本発明の実施の形態２における、ドレンパン内の異常運転状態を検出するアルゴリズムの概略フローチャートを図１２に示す。装置の構成としては、図３であり、測定部１０１によって処理されたデータを用いて判定部１０２にて、ドレンパン内の水位変化から各種異常運転状態を特定・判別するものである。 Next, FIG. 12 shows a schematic flowchart of an algorithm for detecting an abnormal operation state in the drain pan in the second embodiment of the present invention. The configuration of the apparatus is as shown in FIG. 3, in which the determination unit 102 specifies and determines various abnormal operation states from the water level change in the drain pan using the data processed by the measurement unit 101.

まず、水位センサ８ａもしくは８ｂによって測定される水位データＨ、ドレン排出手段稼動状態検出手段３ａによって検出されるドレン排出手段３の稼動状態、吸込空気温度センサ１０によって測定される吸込空気温度Ｔａｉ、吸込空気湿度センサ１１によって測定される吸込空気湿度ＲＨａｉ、吹出空気温度センサ１２によって測定される吹出空気温度Ｔａｏ、吹出空気湿度センサ１３によって測定される吹出空気湿度ＲＨａｏ、送風機風量検出手段７ａによって検出される送風機風量Ｇａデータを取り込む（Ｓ２）。次に、ドレン排出手段３が稼動しているかどうかを判定し（Ｓ３）、稼動しているならば、冷房やドライといった除湿を伴う運転を行っているので、除湿量Ｗａを算出する（Ｓ４）。 First, the water level data H measured by the water level sensor 8a or 8b, the operating state of the drain discharging means 3 detected by the drain discharging means operating state detecting means 3a, the suction air temperature Tai measured by the suction air temperature sensor 10, the suction Detected by the intake air humidity RHai measured by the air humidity sensor 11, the blown air temperature Tao measured by the blown air temperature sensor 12, the blown air humidity RHao measured by the blown air humidity sensor 13, and the blower air volume detection means 7a. The blower air volume Ga data is captured (S2). Next, it is determined whether or not the drain discharge means 3 is operating (S3), and if it is operating, the dehumidifying amount Wa is calculated because the operation involving dehumidification such as cooling or drying is performed (S4). .

次に、定常水位値となるドレン排出手段吸込口水位Ｈ１を既に学習・記憶済みであるか否かを判定する（Ｓ５）。未だ学習していなければ、ドレン排出手段吸込口水位Ｈ１を学習・記憶し（Ｓ６）分岐（Ｓ１３）に入る、既に学習・記憶していれば、現在の水位がドレン排出手段吸込口水位Ｈ１よりも低い正常水位であるか否かを判定する（Ｓ７）。ドレン排出手段吸込口水位Ｈ１以下であれば分岐（Ｓ１３）に入り、正常なドレン排出手段吸込口水位Ｈ１より大きければ、ドレン排出手段３の排出能力が正常状態よりも低下していることを意味するので、ドレン排出手段故障もしくはドレン配管詰りであると判定する。 Next, it is determined whether or not the drain discharge means suction port water level H1 that is a steady water level value has already been learned and stored (S5). If not yet learned, the drain discharge means inlet water level H1 is learned and stored (S6), and the flow enters the branch (S13). If already learned and stored, the current water level is greater than the drain discharge means inlet water level H1. It is determined whether the normal water level is low (S7). If the drain level is lower than the drain discharge means suction port water level H1, the process enters the branch (S13). If the drain level is larger than the normal drain discharge means suction port water level H1, it means that the discharge capacity of the drain discharge means 3 is lower than the normal state. Therefore, it is determined that the drain discharge means is broken or the drain pipe is clogged.

この時、除湿量から推測される水位上昇速度Ｖａと水位データから算出される水位上昇速度Ｖｄとの比較から両者を区別できるので、Ｖａを推測するのに必要なドレンパン底面積Ｓｄを既に学習・記憶済みであるか否かを判定する（Ｓ８）。未だドレンパン底面積Ｓｄを学習していなければ両者の区別がつかないので、ドレン排出手段故障もしくはドレン配管詰りと判定して警報手段（図示せず）に警報を発報させ（Ｓ１２）、分岐（Ｓ１３）に入る。既にドレンパン底面積Ｓｄを学習していれば、除湿量から推測される水位上昇速度Ｖａと水位データから算出される水位上昇速度Ｖｄとを比較し、両者が同程度の値であれば（Ｓ９）、ドレン排出手段３がほとんど機能していないことを意味するので、ドレン排出手段故障と判定して警報手段に警報を発報させ（Ｓ１０）、分岐（Ｓ１３）に入る。そうでなければドレン配管９の詰りによってドレン排出手段３の排出能力が制限されていることを意味するので、ドレン配管詰りと判定して警報手段（図示せず）に警報を発報させ（Ｓ１１）、分岐（Ｓ１３）に入る。 At this time, since the water level rising speed Va estimated from the dehumidification amount and the water level rising speed Vd calculated from the water level data can be distinguished from each other, the drain pan bottom area Sd necessary for estimating Va has already been learned. It is determined whether it has been stored (S8). If the drain pan bottom area Sd has not yet been learned, the two cannot be distinguished from each other. Therefore, it is determined that the drain discharge means has failed or the drain pipe is clogged, and an alarm is issued to an alarm means (not shown) (S12). Enter S13). If the drain pan bottom area Sd has already been learned, the water level rising speed Va estimated from the dehumidification amount is compared with the water level rising speed Vd calculated from the water level data, and if both are the same value (S9) This means that the drain discharge means 3 is hardly functioning. Therefore, it is determined that the drain discharge means has failed, the alarm means is issued an alarm (S10), and the process enters a branch (S13). Otherwise, it means that the discharge capacity of the drain discharge means 3 is limited due to clogging of the drain pipe 9, so that it is determined that the drain pipe is clogged and an alarm means (not shown) issues an alarm (S11). ) And branch (S13).

次に、分岐（Ｓ１３）でドレンパン底面積Ｓｄを既に学習しているか否かを判定し（Ｓ１３）、未だ学習していなければドレンパン底面積Ｓｄを除湿量Ｗａと、ドレンパンの水位上昇速度Ｖｄの値より学習・記憶し（Ｓ１４）、分岐（Ｓ２３）に入る。既にドレンパン断面積Ｓｄを学習・記憶していれば、除湿量Ｗａから推測される水位上昇速度Ｖａと水位データから算出される水位上昇速度Ｖｄとを比較し、水位データから算出される水位上昇速度Ｖｄの方が除湿量から推測される水位上昇速度Ｖａよりも一定量以上大きければ（Ｓ１５）、室内機１によって生成される凝縮水６より多くの水がドレンパン内で増加していることを意味するので、ドレン配管を共有する他の室内機からのドレン浸入と判定し警報手段（図示せず）に警報を発報させ（Ｓ１６）、分岐（Ｓ２３）に入る。 Next, it is determined whether or not the drain pan bottom area Sd has already been learned in the branch (S13) (S13). If the drain pan bottom area Sd has not yet been learned, the drain pan bottom area Sd is determined as the dehumidification amount Wa and the drain pan water level rise speed Vd. Learning and storing from values (S14), and branching (S23) is entered. If the drain pan cross-sectional area Sd has already been learned and stored, the water level rising speed Va estimated from the dehumidification amount Wa is compared with the water level rising speed Vd calculated from the water level data, and the water level rising speed calculated from the water level data is compared. If Vd is larger than the water level rising speed Va estimated from the dehumidification amount by a certain amount or more (S15), it means that more water than the condensed water 6 generated by the indoor unit 1 is increasing in the drain pan. Therefore, it is determined that the drain has entered from another indoor unit sharing the drain pipe, and an alarm means (not shown) issues an alarm (S16), and the process enters a branch (S23).

分岐（Ｓ３）で、ドレン排出手段が稼動していないと判定された場合、ドレン排出手段停止直後の水位変化量ΔＨｂの正常値を既に学習・記憶しているか否かを判定する（Ｓ１７）。未だ学習・記憶していなければ、ドレン排出手段停止直後の水位変化量ΔＨｂの正常値を学習・記憶し（Ｓ１８）、分岐（Ｓ２１）に入る。既に学習・記憶していれば、現在のドレン排出手段停止直後の水位変化量ΔＨｂを正常時の値と比較し（Ｓ１９）、正常値とほぼ同程度もしくはそれ以下であれば正常と判定し、分岐（Ｓ２１）に入り、そうでなければドレン配管詰り、もしくはドレンパン内ゴミ堆積と判定して警報手段（図示せず）に警報を発報させ（Ｓ２０）、分岐（Ｓ２１）に入る。 When it is determined at the branch (S3) that the drain discharging means is not operating, it is determined whether or not the normal value of the water level change amount ΔHb immediately after the drain discharging means is stopped is already learned and stored (S17). If not yet learned and stored, the normal value of the water level change amount ΔHb immediately after stopping the drain discharging means is learned and stored (S18), and the process enters the branch (S21). If already learned and stored, the current level change amount ΔHb immediately after stopping the drainage means is compared with the normal value (S19), and if it is approximately the same as or lower than the normal value, it is determined to be normal. Enter branch (S21). Otherwise, it is determined that the drain piping is clogged or the dust is accumulated in the drain pan, and an alarm is issued to alarm means (not shown) (S20), and branch (S21) is entered.

分岐Ｓ２１において、ドレン排出手段が稼動していない状態、つまり冷房やドライ運転により除湿が行われず凝縮水６がほとんどない状態で、水位の上昇が測定されるか否かを判定し、水位の上昇が測定された場合は、ドレン配管を共有する他の室内機からのドレン浸入と判定し警報手段（図示せず）に警報を発報させ（Ｓ２２）、分岐（Ｓ２３）に入る。 In branch S21, it is determined whether or not the rise in the water level is measured in a state where the drain discharge means is not operating, that is, in a state where the dehumidification is not performed by cooling or dry operation and there is almost no condensed water 6. Is measured, it is determined that the drain has entered from another indoor unit sharing the drain pipe, an alarm means (not shown) issues an alarm (S22), and a branch (S23) is entered.

分岐（Ｓ２３）において、ドレンパンの水漏れに至る位置よりも所定量の低い位置に危険水位を設定し、その危険水位と現在の水位を比較し、危険水位に達していたら警報手段（図示せず）に警報を発報させる（Ｓ２４）ことで、各種異常運転状態の検知漏れに対応することができる。 At the branch (S23), a dangerous water level is set at a position that is a predetermined amount lower than the position where the drain pan leaks, the dangerous water level is compared with the current water level, and alarm means (not shown) is reached if the dangerous water level is reached. ) (S24), it is possible to cope with detection failure of various abnormal operation states.

以上のように、時系列測定可能な水位センサによって取得された、ドレン５の過渡的な水位データから抽出される、ドレン排出手段３の吸込口到達後の水位定常値Ｈ１、除湿量Ｗａから求まる水位上昇速度Ｖａ、水位センサから求まる水位上昇速度Ｖｄ、ドレン排出手段３停止直後の水位変化量ΔＨｂ、ドレン排出手段３停止時の水位が各種異常運転状態において異なるため、これらの値を、正常運転状態の値と比較することにより、各種異常運転状態を検出・判別することができ、判別結果を警報手段（図示せず）に警報として発報させることでサービス点検作業の負荷の低減および異常原因を特定・判別することが可能となる。 As described above, it is obtained from the water level steady value H1 after reaching the suction port of the drain discharge means 3 and the dehumidification amount Wa extracted from the transient water level data of the drain 5 obtained by the water level sensor capable of time series measurement. Since the water level rise speed Va, the water level rise speed Vd obtained from the water level sensor, the water level change amount ΔHb immediately after the drain discharge means 3 stops, and the water level when the drain discharge means 3 stops, these values are different from each other in normal operation. By comparing with the status value, it is possible to detect and discriminate various abnormal operating states, and by causing the alarm means (not shown) to issue the discrimination result as an alarm, reducing the service inspection work load and the cause of the abnormality Can be identified and determined.

また、室内機１の室内熱交換器４での空気湿度変化（エンタルピー効率ε）は、機種によりほぼ決まった値であるため、室内機の機種毎のエンタルピー効率εの値をあらかじめ登録しておけば、前記吸込空気湿度は、吸込空気温度Ｔａｉと、吹出空気温度Ｔａｏと、吹出空気湿度ＲＨａｏと、室内熱交換器４の温度（蒸発温度）から、吸込空気湿度ＲＨａｉを予測可能である。以下にその吸込空気湿度RHaiの予測方法について説明する。 Moreover, since the change in air humidity (enthalpy efficiency ε) in the indoor heat exchanger 4 of the indoor unit 1 is almost a value determined by the model, the value of the enthalpy efficiency ε for each model of the indoor unit can be registered in advance. For example, the intake air humidity RHai can be predicted from the intake air temperature Tai, the blown air temperature Tao, the blown air humidity RHao, and the temperature (evaporation temperature) of the indoor heat exchanger 4. The method for predicting the intake air humidity RHai will be described below.

室内熱交換器４でのエンタルピー効率をεとすると、空気の吸込空気エンタルピーをIai［kJ/kg］は、吹出空気エンタルピーをIao［kJ/kg］、室内熱交換器４の温度Te［℃］の飽和空気のエンタルピーをIe［kJ/kg］として、次式で表される。 If the enthalpy efficiency in the indoor heat exchanger 4 is ε, the air intake air enthalpy is Iai [kJ / kg], the blown air enthalpy is Iao [kJ / kg], and the temperature Te [° C] of the indoor heat exchanger 4 Assuming that the enthalpy of saturated air is Ie [kJ / kg], it is expressed by the following equation.

ここで、Iaoは、吹出空気温度Tao［℃］と、吹出空気湿度RHao［％］より演算可能であり、Ieは、室内熱交換器４の温度Te［℃］で相対湿度を１００％として演算可能であり、εは一定値として仮定すれば、吸込空気のエンタルピーIaiを求めることができる。吸込空気のエンタルピーIaiが求まれば、吸込空気温度Taiより、吸込空気湿度RHaiを推測することができる。ここで、室内熱交換器４の温度は、室内機もしくは室外機の運転情報より得てもよいし、吹出空気温度Taoに対して所定量低い温度と仮定し求めてもよい。したがって、吸込空気湿度センサ１２が不要となるため、コスト削減が図られる。 Here, Iao can be calculated from the blown air temperature Tao [° C] and the blown air humidity RHao [%], and Ie is calculated using the temperature Te [° C] of the indoor heat exchanger 4 as a relative humidity of 100%. If ε is assumed to be a constant value, the enthalpy Iai of the intake air can be obtained. If the enthalpy Iai of the intake air is obtained, the intake air humidity RHai can be estimated from the intake air temperature Tai. Here, the temperature of the indoor heat exchanger 4 may be obtained from the operation information of the indoor unit or the outdoor unit, or may be determined on the assumption that the temperature is a predetermined amount lower than the blown air temperature Tao. Therefore, the suction air humidity sensor 12 is not necessary, and the cost can be reduced.

さらに、前記吹出空気湿度は、冷房運転時もしくは除湿運転時に、室内熱交換器４を通過する吹出空気の相対湿度は通常１００％近く、飽和空気状態に近い状態であるため、吹出空気湿度を１００％と仮定してもよい。したがって、図４に示すように、吹出空気湿度センサ１３も不要となるため、コスト削減が図られる。 Further, since the relative humidity of the blown air passing through the indoor heat exchanger 4 is usually close to 100% and close to the saturated air state during the cooling operation or the dehumidifying operation, the blown air humidity is set to 100%. % May be assumed. Therefore, as shown in FIG. 4, the blown air humidity sensor 13 is also unnecessary, so that the cost can be reduced.

電算室やサーバールーム等に設置されている室内機においては、高顕熱比（除湿量が少ない）の室内機が使用され、空調負荷によっては、吹出空気の相対湿度が１００％よりも低い状態で吹出されるため、図３のように吹出空気湿度センサ１３を設けることでより高精度な検知が可能となる。 In indoor units installed in computer rooms, server rooms, etc., indoor units with a high sensible heat ratio (less dehumidification) are used, and depending on the air conditioning load, the relative humidity of the blown air may be lower than 100%. Since the air is blown out, more accurate detection is possible by providing the blown air humidity sensor 13 as shown in FIG.

また、通常、前記ドレン排出手段３の稼動状態は、冷房運転もしくは除湿運転であれば稼動しており、それ以外の運転状態であれば停止しているため、吸込空気温度よりも吹出空気温度が所定の値以上低ければ、冷房運転もしくは除湿運転で、ドレン排出手段３が稼動していると判定でき、それ以外であれば、停止、送風、もしくは暖房運転であり、ドレン排出手段３が停止している判定できる。したがって、既設の室内機に組み込む際に、ドレン排出手段３の稼動状態の情報が得られない場合には、吸込空気温度と吹出空気温度の温度差よりドレン稼動状態を推定してもよい。 Further, since the operation state of the drain discharge means 3 is normally operated in the cooling operation or the dehumidifying operation and is stopped in the other operation states, the blown air temperature is higher than the intake air temperature. If it is lower than a predetermined value, it can be determined that the drain discharge means 3 is operating in the cooling operation or the dehumidification operation. Otherwise, it is a stop, air blow or heating operation, and the drain discharge means 3 stops. Can be determined. Therefore, when information on the operating state of the drain discharge means 3 is not obtained when incorporating into an existing indoor unit, the drain operating state may be estimated from the temperature difference between the intake air temperature and the blown air temperature.

この発明の実施の形態１における、ドレンパン内の異常運転状態を検出する装置を付加した空気調和機の構成図（水位センサ８ａがドレンパン２の内部上方のドレン排出手段３近傍に設置されている場合）である。1 is a configuration diagram of an air conditioner to which an apparatus for detecting an abnormal operation state in a drain pan is added according to Embodiment 1 of the present invention (when a water level sensor 8a is installed in the vicinity of a drain discharge means 3 above the drain pan 2). ). この発明の実施の形態１における、ドレンパン内の異常運転状態を検出する装置を付加した空気調和機の概略構成図（水位センサ８ｂがドレンパン２の外壁側面に設置されている場合）である。It is a schematic block diagram (when the water level sensor 8b is installed in the outer wall side surface of the drain pan 2) of the air conditioner which added the apparatus which detects the abnormal driving | running state in a drain pan in Embodiment 1 of this invention. この発明の実施の形態２における、ドレンパン内の異常運転状態を検出する装置を付加した空気調和機の概略構成図である。It is a schematic block diagram of the air conditioner which added the apparatus which detects the abnormal driving | running state in a drain pan in Embodiment 2 of this invention. この発明の実施の形態３における、ドレンパン内の異常運転状態を検出する装置を付加した空気調和機の概略構成図である。It is a schematic block diagram of the air conditioner which added the apparatus which detects the abnormal driving | running state in a drain pan in Embodiment 3 of this invention. この発明の実施の形態１における、正常運転時のドレンの水位変化（除湿量が多い場合）を示す図である。It is a figure which shows the water level change (when there is much dehumidification amount) of the drain at the time of normal operation in Embodiment 1 of this invention. この発明の実施の形態１における、ドレン排出手段故障時の水位変化を示す図である。It is a figure which shows the water level change at the time of drain discharge means failure in Embodiment 1 of this invention. この発明の実施の形態１における、ドレンパン内にゴミが堆積し堰が形成されている場合の水位変化を示す図である。It is a figure in Embodiment 1 of this invention which shows a water level change in case dust accumulates in the drain pan and the weir is formed. この発明の実施の形態１における、ドレン排出手段が停止時に、ドレン配管９の施工不良により、ドレン配管９を共有する他の室内機からドレンが浸入している場合の水位変化を示す図である。In Embodiment 1 of this invention, it is a figure which shows a water level change in case drain | drain has infiltrated from the other indoor unit which shares drain piping 9 by the construction defect of drain piping 9 at the time of the drain discharge means stopping. . この発明の実施の形態２における、正常運転時のドレンの水位変化（除湿量が少ない場合）を示す図である。It is a figure which shows the water level change (when there are few dehumidification amounts) of the drain at the time of normal operation in Embodiment 2 of this invention. この発明の実施の形態２における、ドレン排出手段故障時、ドレン配管の施工不良により、ドレン配管９を共有する他の室内機からドレンがドレンパンに浸入する場合の水位変化、およびドレン配管９の配管詰まりが発生した場合の水位変化を示す図である。In the second embodiment of the present invention, when the drain discharge means fails, the drain level changes when the drain enters the drain pan from other indoor units sharing the drain pipe 9 due to poor construction of the drain pipe, and the piping of the drain pipe 9 It is a figure which shows the water level change when clogging generate | occur | produces. この発明の実施の形態１における、各種異常運転状態を検出するアルゴリズムの概略フローチャートである。It is a schematic flowchart of the algorithm which detects the various abnormal driving | running states in Embodiment 1 of this invention. この発明の実施の形態２における、各種異常運転状態を検出するアルゴリズムの概略フローチャートである。It is a schematic flowchart of the algorithm which detects the various abnormal driving | running states in Embodiment 2 of this invention.

Explanation of symbols

１室内機、２ドレンパン、３ドレン排出手段、３ａドレン排出手段制御手段、４室内熱交換器、５ドレン（ドレンパン内滞留）、６凝縮水、７送風機、７ａ送風機風量検出手段、８ａ水位センサ（ドレンパン上方設置）、８ｂ水位センサ（ドレンパン外壁設置）、９ドレン配管、１０吸込空気温度センサ、１１吸込空気湿度センサ、１２吹出空気温度センサ、１３吹出空気湿度センサ、１４ドレン排水、１０１測定部、１０２判定部。 DESCRIPTION OF SYMBOLS 1 Indoor unit, 2 Drain pan, 3 Drain discharge means, 3a Drain discharge means control means, 4 Indoor heat exchanger, 5 Drain (retention in drain pan), 6 Condensed water, 7 Blower, 7a Blower air volume detection means, 8a Water level sensor ( Drain pan upper installation), 8b Water level sensor (drain pan outer wall installation), 9 Drain piping, 10 Suction air temperature sensor, 11 Suction air humidity sensor, 12 Blow air temperature sensor, 13 Blow air humidity sensor, 14 Drain drainage, 101 Measuring unit, 102 determination part.

Claims

It consists of multiple indoor units and at least one outdoor unit,
The indoor unit is
A heat exchanger,
A blowing means for sending air to the heat exchanger to exchange heat;
A drain pan for receiving drain generated from the heat exchanger;
Drain discharge means for discharging drain accumulated in the drain pan to the outside of the indoor unit;
A drain pipe for carrying the drain discharged by the drain discharging means to the outside;
Water level detection means for detecting a continuous change in the water level of the drain;
A blower air volume detecting means for detecting the air volume of the air blowing means;
An intake air temperature sensor for detecting the temperature of the intake air flowing into the heat exchanger;
A suction air humidity sensor for detecting the humidity of the suction air flowing into the heat exchanger;
A blown air temperature sensor for detecting a blown air temperature of the blown air that has passed through the heat exchanger;
A blown air humidity sensor that detects the humidity of the blown air that has passed through the heat exchanger;
Dehumidification amount calculation of the output of the blower air flow detection means, the output of the intake air temperature sensor, the output of the intake air humidity sensor, the output of the blown air temperature sensor, and the output of the blown air humidity sensor An operation state of the drain discharge means and a measurement unit for capturing the output of the water level sensor ,
A determination unit for determining a plurality of abnormal operation states;
An alarm means ,
The determination unit calculates a first water level increase rate based on the dehumidification amount calculation data captured by the measurement unit, and further calculates a second from the increase amount of the output of the water level sensor captured by the measurement unit in a predetermined time. Calculate the water level rise speed of
During cooling operation or dehumidifying operation, the determination unit compares the learned and stored values during normal operation,
When the second water level rise speed is higher than the first water level rise speed until the water level reaches the position of the suction port of the drain discharge means after generation of condensed water, the determination unit It is determined that the drain intrusion is abnormal from other indoor units that share the drain pipe due to poor piping construction.
After the water level reaches the position of the suction port of the drain discharge means, when the second water level rising speed is smaller than the first water level rising speed, the determination unit is abnormal in the clogging of the drain pipe. And
If the water level is equal to or higher than the position of the suction port of the drain discharge means, and the second water level rise speed is substantially equal to the first water level rise speed, it is determined that the drain drain means has failed,
An air conditioner that issues a warning to that effect to the warning means .

The determination unit extracts from the water level data, at least a water level steady value, a water level change amount, among the characteristic amounts of a water level steady value, a water level change rate, a water level change amount, and an operating state of the drain discharge means. 2. The air conditioner according to claim 1, wherein the air conditioner is used for determination of the abnormal operation state by combining feature amounts including an operation state of the drain discharge unit.

The determination unit extracts at least a water level steady value and a feature value of a normal operation state including the water level change amount from the water level steady value, the water level change speed, and the water level change amount extracted from the water level data. The air conditioner according to claim 1 or 2 , wherein learning and storing are performed, and each feature amount of the normal operation state is used for the determination of the abnormal operation state.

The determination unit pre-registers a feature pattern for each abnormal operation state at the time of occurrence of drain discharge failure, drain pipe clogging, dust accumulation in the drain pan, and drain intrusion from other indoor units sharing the drain pipe. The air conditioner according to any one of claims 1 to 3 , wherein at least one combination of the above is used for specifying the abnormal operation state.

With warning means,
The said determination part changes the warning method to the said warning means by the risk level of the risk of a water leak among the determined abnormal driving | running states, The any one of Claims 1-4 characterized by the above-mentioned. The air conditioner described.

The air according to any one of claims 1 to 5 , wherein the water level detection means is installed on an outer wall side surface of the drain pan, and detects a water level change in the drain pan through the drain pan wall. Harmony machine.

The water level detection means is a capacitance system that measures a spatial distribution of capacitance in a detection range and detects a water level in the drain pan from an occupation range of a drain as an object. The air conditioner according to any one of claims 1 to 6 .

The water level detection means is provided above the drain pan, oscillates an ultrasonic wave, and detects a water level change in the drain pan from an arrival time of a reflected wave from a drain pan water surface as an object. The air conditioner according to any one of claims 1 to 5 .

The air conditioner according to any one of claims 1 to 8 , wherein the data measurement unit and the determination unit are installed at positions separated from each other and connected by wire or wirelessly.

The air conditioner according to any one of claims 1 to 8 , wherein the data measurement unit and the determination unit are installed at positions adjacent to the air conditioner.

Before Symbol judging unit, a feature that is used and the temperature of the suction air detected by the intake air temperature detecting means and the temperature of the outlet air detected by the outlet air temperature detecting means to determine the abnormal operating condition The air conditioner according to claim 1.

Instead of obtaining the operating state of the drain discharge means output from the measurement unit, the determination unit,
The operation state of the drain discharge means is estimated based on the intake air temperature of the heat exchanger detected by the intake air temperature detection means and the blown air temperature detected by the blown air temperature detection means. The air conditioner according to claim 11 .

The determination unit includes an air volume Ga [m ³ / min] of the blower, an intake air temperature Tai [° C.] to the heat exchanger detected by an intake air temperature sensor, and an intake air humidity sensor to the heat exchanger. The absolute humidity xai [kg / kg ′] of the intake air calculated based on the detected humidity RHai [%] of the intake air, the density ρai [kg / m ³ ] of the intake air, and detected by the blown air sensor The absolute humidity xao [kg / kg ′] of the blown air calculated from the blowout temperature Tao [° C.], the blown air humidity RHao [%] detected by the blown air humidity sensor, and the density ρao [kg / m] of the blown air ³ ], the density ρw [kg / m ³ ] of the drain, and the dehumidification amount Wa [m ³ / min] obtained from the air state change before and after the heat exchanger from the following equation:

Relational expression for calculating the dehumidification amount Wd [m ³ / min] from the bottom area Sd [m ² ] and the water level rising speed Vd [m / min] Wd = Vd × Sd
And until the water level of the drain pan reaches the water level of the suction port of the drain discharging means, the relational expression Wa established between the dehumidification amount Wa [m ³ / min] and the dehumidification amount Wd [m ³ / min]. = Wd
Further, the bottom area of the drain pan is estimated, the value of the estimated bottom area is stored in the measurement unit, and the dehumidification amount is calculated from the water level rising speed and the stored bottom area. Item 1. An air conditioner according to item 1 .

If the bottom area of the drain pan is known in advance, the determination unit stores and holds in advance in the measurement unit according to the model of the indoor unit, and directly determines the dehumidification amount from the water level rise rate. The air conditioner according to claim 1 .