JP2012026702A - Air conditioner - Google Patents

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JP2012026702A
JP2012026702A JP2010168728A JP2010168728A JP2012026702A JP 2012026702 A JP2012026702 A JP 2012026702A JP 2010168728 A JP2010168728 A JP 2010168728A JP 2010168728 A JP2010168728 A JP 2010168728A JP 2012026702 A JP2012026702 A JP 2012026702A
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temperature
heat exchanger
outdoor heat
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JP5672820B2 (en
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Kuniko Hayashi
久仁子 林
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Fujitsu General Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a method of detecting clogging of a heat exchanger in an outdoor unit.SOLUTION: A temperature detected by a temperature sensor 2a disposed in an outdoor unit 7a and a temperature detected by a temperature sensor 2b disposed in another outdoor unit 7b are compared, and further, a temperature calculated from a pressure 6a of a high-pressure refrigerant discharged from a compressor and the temperature detected by the temperature sensor in the outdoor unit are compared to detect the clogging of the heat exchanger.

Description

本発明は、圧縮機、室外熱交換器を設けた複数台の室外機を備えた空気調和機であって、室外機内にある室外熱交換器の目詰まりを検出するものである。   The present invention is an air conditioner including a plurality of outdoor units provided with a compressor and an outdoor heat exchanger, and detects clogging of the outdoor heat exchanger in the outdoor unit.

従来、室外機内にある室外熱交換器の目詰まりを検出する方法としては、室内温度と、室外熱交換器の温度と、圧縮機の回転数を検出し、室内温度に基づいて圧縮機の回転数を算出し、算出した圧縮機の回転数と検出した圧縮機の回転数を比較し、所定時間、検出した圧縮機の回転数が低い場合、室外熱交換器の温度が所定の温度以上であるときに、室外熱交換器が目詰まりをしていると判断する方法があった。（特許文献１）   Conventionally, as a method for detecting clogging of an outdoor heat exchanger in an outdoor unit, the indoor temperature, the temperature of the outdoor heat exchanger, and the rotational speed of the compressor are detected, and the rotation of the compressor is determined based on the indoor temperature. The number of rotations of the compressor is calculated and compared with the detected number of rotations of the compressor. If the detected number of rotations of the compressor is low for a predetermined time, the temperature of the outdoor heat exchanger is equal to or higher than the predetermined temperature. There was a way to judge that the outdoor heat exchanger was clogged. (Patent Document 1)

特開２００８―９５９６９号公報JP 2008-95969 A

しかし、上記特許文献１における目詰まり検出方法においては、以下のように必ずしも正確に室外熱交換器の目詰まりを検出できない場合があった。外気温が高い時、室外機内に設けられた室外熱交換器の温度が上昇すると、室外熱交換器内の冷媒が安全気圧を超える場合があり、このとき、空気調和機は、圧縮機の回転数を下げて、冷媒が安全気圧を超えないようにしている。このような制御を行った場合の圧縮機回転数は、室内温度から算出した圧縮機回転数よりも低くなってしまい、特許文献１に記載されたような室外熱交換器の目詰まりの検出方法では正確に室外熱交換器の目詰まり検出ができないおそれがあった。   However, in the clogging detection method disclosed in Patent Document 1, clogging of the outdoor heat exchanger may not always be accurately detected as follows. When the temperature of the outdoor heat exchanger provided in the outdoor unit rises when the outside air temperature is high, the refrigerant in the outdoor heat exchanger may exceed the safe atmospheric pressure. At this time, the air conditioner rotates the compressor The number is lowered so that the refrigerant does not exceed the safe atmospheric pressure. The compressor rotation speed when such control is performed is lower than the compressor rotation speed calculated from the room temperature, and the detection method of the clogging of the outdoor heat exchanger as described in Patent Document 1 However, there was a possibility that the clogging of the outdoor heat exchanger could not be detected accurately.

また、先行技術に明記されている、一台の室外機の目詰まり検出する方法を、複数台の室外機に適用することは可能である。しかし、複数台の室外機が全部稼動する状態は常には無い為、停止している室外機の影響で圧縮機から吐出する冷媒の温度や圧力が変化する。よって、先行技術の目詰まり検出する方法で複数台の室外機の目詰まりを検出する場合、圧縮機から吐出する冷媒の温度や圧力が増加した時、圧縮機が回転数を下げる為、室外機の熱交換器が正常な状態であるにも関わらず、室内温度から算出した圧縮機回転数よりも低くなってしまい、目詰まりであると誤判断するおそれがあった。   In addition, the method for detecting clogging of one outdoor unit specified in the prior art can be applied to a plurality of outdoor units. However, since the plurality of outdoor units are not always in operation, the temperature and pressure of the refrigerant discharged from the compressor change due to the influence of the stopped outdoor unit. Therefore, when detecting clogging of a plurality of outdoor units by the method for detecting clogging in the prior art, when the temperature or pressure of the refrigerant discharged from the compressor increases, the compressor reduces the rotational speed. In spite of the normal state of the heat exchanger, the compressor rotational speed calculated from the room temperature becomes lower, and there is a possibility that it is erroneously determined as clogged.

そこで、本発明は、複数台の室外機を備えた空気調和機において、室外機内にある室外熱交換器の目詰まりを検出し、特に、外気温が高い場合でも、室外熱交換器の目詰まりを精度良く検出することを目的とするものである。   Therefore, the present invention detects clogging of an outdoor heat exchanger in an outdoor unit in an air conditioner having a plurality of outdoor units, and in particular, the outdoor heat exchanger is clogged even when the outdoor temperature is high. The purpose of this is to detect accurately.

上記目的を達成する為に、本発明の空気調和機は、第一室外機内にある室外熱交換器近傍に配置した外気温を検出する為の配置した第一温度センサーで検出した温度と圧縮機から吐出した高圧冷媒の圧力から算出した飽和温度との温度差である第一の温度差を算出する。この第一の温度差から室外熱交換器が目詰まりしているか否かを判断するものである。   In order to achieve the above object, the air conditioner of the present invention includes a compressor and a temperature detected by a first temperature sensor arranged to detect an outside air temperature arranged in the vicinity of the outdoor heat exchanger in the first outdoor unit. A first temperature difference, which is a temperature difference from the saturation temperature calculated from the pressure of the high-pressure refrigerant discharged from, is calculated. It is determined whether or not the outdoor heat exchanger is clogged from the first temperature difference.

また、室外機が複数ある場合、第一室外機内にある室外熱交換器近傍に配置した外気温を検出する為の第一温度センサーで検出した温度と第二室外機内にある熱交換器近傍に配置した外気温を検出する為の第二温度センサーで検出した温度との温度差である第二の温度差を算出する。算出した第二の温度差が所定の値未満である場合のみ、上記の処理により第一室外機の室外熱交換器が目詰まりしているか否かを判断するものである。   In addition, when there are multiple outdoor units, the temperature detected by the first temperature sensor for detecting the outside air temperature arranged in the vicinity of the outdoor heat exchanger in the first outdoor unit and the vicinity of the heat exchanger in the second outdoor unit A second temperature difference that is a temperature difference from the temperature detected by the second temperature sensor for detecting the arranged outside air temperature is calculated. Only when the calculated second temperature difference is less than a predetermined value, it is determined whether or not the outdoor heat exchanger of the first outdoor unit is clogged by the above processing.

このような空気調和機によれば、外気温が高い場合でも、室外機内にある室外熱交換器が目詰まりしているか否かを高い精度で検出することが出来る。   According to such an air conditioner, it is possible to detect with high accuracy whether or not the outdoor heat exchanger in the outdoor unit is clogged even when the outdoor temperature is high.

本発明の空気調和器の構成図である。It is a block diagram of the air conditioner of this invention. 本発明の第二の温度差と第二の所定温度差との比較表である。It is a comparison table of the 2nd temperature difference of the present invention, and the 2nd predetermined temperature difference. 本発明の第一の温度差と第一の所定温度差との比較表である。It is a comparison table of the 1st temperature difference of the present invention, and the 1st predetermined temperature difference. 本発明の目詰まりを判断するフローチャートである。It is a flowchart which judges the clogging of this invention.

本発明は、複数の室外機を備えた空気調和機であって、室外機内にある熱交換器つまり室外熱交換器の目詰まりを検出するものである。以下に、室外熱交換器の目詰まりの検出方法を示す。任意の室外機内にある室外熱交換器近傍に配置した外気温を検出する為の温度センサーである第一温度検出手段で検出した温度と上記の室外機とは別の室外機の室外熱交換器近傍に配置した外気温を検出する為の温度センサーである第二温度検出手段で検出した温度との温度差である第二の温度差を算出する。そして、算出した第二の温度差が所定の条件を満たしているか否かを判断する。ここで、第二の温度差が所定の条件を満たしていない場合は目詰まり検出を終了する。第二の温度差が所定の条件を満たす場合は、上記の室外機内にある圧縮機から吐出された冷媒の圧力を検出する第一冷媒圧力検出手段で検出した圧力から算出される飽和温度と、室外熱交換器近傍に配置した外気温を検出する為の温度センサーである第一温度検出手段で検出した温度との温度差である第一の温度差を算出する。そして、算出した第一の温度差が所定の条件を満たしているか否かで、室外熱交換器が目詰まりしているか否かを判断する。   The present invention is an air conditioner including a plurality of outdoor units, and detects clogging of a heat exchanger in the outdoor unit, that is, an outdoor heat exchanger. Below, the detection method of clogging of an outdoor heat exchanger is shown. An outdoor heat exchanger of an outdoor unit different from the temperature detected by the first temperature detecting means, which is a temperature sensor for detecting an outside air temperature disposed in the vicinity of the outdoor heat exchanger in an arbitrary outdoor unit A second temperature difference which is a temperature difference from the temperature detected by the second temperature detecting means which is a temperature sensor for detecting the outside air temperature arranged in the vicinity is calculated. Then, it is determined whether or not the calculated second temperature difference satisfies a predetermined condition. If the second temperature difference does not satisfy the predetermined condition, the clogging detection is terminated. When the second temperature difference satisfies a predetermined condition, a saturation temperature calculated from the pressure detected by the first refrigerant pressure detecting means for detecting the pressure of the refrigerant discharged from the compressor in the outdoor unit, A first temperature difference which is a temperature difference from the temperature detected by the first temperature detecting means which is a temperature sensor for detecting the outside air temperature arranged in the vicinity of the outdoor heat exchanger is calculated. Then, it is determined whether or not the outdoor heat exchanger is clogged based on whether or not the calculated first temperature difference satisfies a predetermined condition.

以下、本発明の実施の形態における空気調和機について、図１を基に説明する。図１は冷房運転時の空気調和器の冷凍サイクル系統図で、矢印は冷房運転時の冷媒の流れを示したものである。図１に示すように、本実施例における空気調和機は、２台の室外機（７a、７b）を備えており、この室外機（７a、７b）は各々、高温高圧の冷媒を吐出する圧縮機（１a、１b）と、その高温高圧の冷媒を凝縮する室外熱交換器（３a、３b）と、冷媒を液体と気体に分離するアキュームレータ（５a、５b）を備えている。さらに、本実施例における空気調和機は、複数台の室内機を備えており、この室内機は各々、凝縮された冷媒を膨張させる膨張弁（８a、８b、８c）と、膨張した冷媒を蒸発させて室内空気と熱交換して室内空気を冷却する室内熱交換器（４a、４b、４c）を備えている。   Hereinafter, an air conditioner according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a refrigeration cycle system diagram of an air conditioner during cooling operation, and an arrow indicates a refrigerant flow during cooling operation. As shown in FIG. 1, the air conditioner in the present embodiment includes two outdoor units (7a, 7b), and each of the outdoor units (7a, 7b) is a compression that discharges a high-temperature and high-pressure refrigerant. Machine (1a, 1b), an outdoor heat exchanger (3a, 3b) for condensing the high-temperature and high-pressure refrigerant, and an accumulator (5a, 5b) for separating the refrigerant into liquid and gas. Further, the air conditioner in the present embodiment includes a plurality of indoor units, each of which expands the condensed refrigerant (8a, 8b, 8c) and evaporates the expanded refrigerant. And indoor heat exchangers (4a, 4b, 4c) that cool the room air by exchanging heat with the room air.

また、本実施例における空気調和器は、圧縮機（１a、１b）と、室外熱交換器（３a、３b）と、膨張弁（８a、８b、８c）と、室内熱交換器（４a、４b、４c）と、アキュームレータ（５a、５b）とを順次接続して成る冷凍サイクルから構成される。   Moreover, the air conditioner in a present Example is a compressor (1a, 1b), an outdoor heat exchanger (3a, 3b), an expansion valve (8a, 8b, 8c), and an indoor heat exchanger (4a, 4b). 4c) and an accumulator (5a, 5b) are sequentially connected to form a refrigeration cycle.

さらに、第一室外熱交換器３a近傍に配置した外気温を検出する為の第一温度検出手段である第一温度サーミスタ２aと、第二室外熱交換器３b近傍に配置した外気温を検出する為の第二温度検出手段である第二温度サーミスタ２bと、第一圧縮機１aの吐出冷媒圧力を検出する第一冷媒圧力検出手段である第一吐出冷媒用圧力センサー６aと、第二圧縮機１bの吐出冷媒圧力を検出する第二冷媒圧力検出手段である第二吐出冷媒用圧力センサー６bなどのセンサーを用いて、制御部（図示しない）が冷凍サイクルの制御を行っている。また、室外熱交換器（３a、３b）が目詰まりしているか否かを判断する判断手段である判断部（図示しない）は、室外機（７a、７b）内にある制御基板（図示しない）上に搭載され、マイコンなどから構成される。また、制御基板は通信回線を介して相互に接続されており、判断部は各室外機内に配置されている上記各構成から情報を収集し、収集した情報を基に室外熱交換器（３a、３b）が目詰まりしているか否かを判断する機能を有している。   Furthermore, the 1st temperature thermistor 2a which is the 1st temperature detection means for detecting the outside temperature arrange | positioned in the 1st outdoor heat exchanger 3a vicinity, and the outside temperature arrange | positioned in the 2nd outdoor heat exchanger 3b vicinity are detected. A second temperature thermistor 2b which is a second temperature detecting means for the purpose, a first refrigerant pressure sensor 6a which is a first refrigerant pressure detecting means for detecting a refrigerant pressure discharged from the first compressor 1a, and a second compressor A control unit (not shown) controls the refrigeration cycle using a sensor such as a second discharge refrigerant pressure sensor 6b which is a second refrigerant pressure detection means for detecting the discharge refrigerant pressure of 1b. In addition, a determination unit (not shown) that is a determination means for determining whether or not the outdoor heat exchanger (3a, 3b) is clogged is a control board (not shown) in the outdoor unit (7a, 7b). It is mounted on and consists of a microcomputer. The control boards are connected to each other via a communication line, and the determination unit collects information from each of the above-described components arranged in each outdoor unit. Based on the collected information, the outdoor heat exchanger (3a, 3b) has a function of determining whether clogging occurs.

ここで、室外熱交換器（３a、３b）が目詰まりする理由について説明する。まず初めに、室外熱交換器（３a、３b）の構造から説明する。室外熱交換器（３a、３b）は、狭い隙間をもって並列配置された薄板から構成される多数のフィンを備え、そのフィンを貫通するように、複数のパイプが多段に配置されている。そして、これらパイプが端部で接続されて一本の連続した冷媒用コイルを形成している。冷房運転時、圧縮機（１a、１b）から吐出され、この冷媒用コイル中を流れる冷媒は、室外機（７a、７b）内にあるファンが送風する空気により冷却され、そして凝縮し液化する。ファンが送風する空気が、室外熱交換器（３a、３b）のフィンの隙間を通過する。その時、通過する空気中に含まれるちり、ほこり等がフィンやパイプに付着し、これが次第に堆積してフィンの隙間を目詰まり状態にする。   Here, the reason why the outdoor heat exchangers (3a, 3b) are clogged will be described. First, the structure of the outdoor heat exchanger (3a, 3b) will be described. The outdoor heat exchanger (3a, 3b) includes a large number of fins composed of thin plates arranged in parallel with a narrow gap, and a plurality of pipes are arranged in multiple stages so as to penetrate the fins. These pipes are connected at the ends to form one continuous refrigerant coil. During the cooling operation, the refrigerant discharged from the compressor (1a, 1b) and flowing through the refrigerant coil is cooled by the air blown by the fan in the outdoor unit (7a, 7b), and condensed and liquefied. The air blown by the fan passes through the gaps between the fins of the outdoor heat exchangers (3a, 3b). At that time, dust, dust or the like contained in the passing air adheres to the fins and pipes, which gradually accumulate and clog the fin gaps.

室外熱交換器（３a、３b）が目詰まりする他の理由としては、室外機（７a、７b）が屋外に設置されていることがあげられる。室外機（７a、７b）は常に外気に触れており、風雨にさらされる為、室外熱交換器（３a、３b）フィンの隙間にゴミや、ほこり、砂などが溜る。これにより、フィンの隙間が目詰まり状態になる。   Another reason for the clogging of the outdoor heat exchangers (3a, 3b) is that the outdoor units (7a, 7b) are installed outdoors. Since the outdoor units (7a, 7b) are always exposed to the outside air and exposed to wind and rain, dust, dust, sand, etc. accumulate in the gaps between the fins of the outdoor heat exchanger (3a, 3b). As a result, the gap between the fins becomes clogged.

本発明の第一室外熱交換器３aが目詰まりした場合、第一室外熱交換器３aの空気抵抗が大きくなり、外気と第一室外熱交換器３aとの熱交換が十分にできなくなり、第一室外熱交換器３aが放熱しにくくなる。そのため、第一室外熱交換器３a近傍に配置した外気温を検出する為の第一温度サーミスタ２aの周りの空気が流れないことで暖められて、第一温度サーミスタ２aが検出する温度が、第一室外熱交換器３aが正常な場合に第一温度サーミスタ２aが検出する温度よりも高くなる。この結果、第一吐出冷媒用圧力センサー６aが検出する圧力から算出される温度と第一温度サーミスタ２aの温度がほぼ等しくなる。   When the first outdoor heat exchanger 3a of the present invention is clogged, the air resistance of the first outdoor heat exchanger 3a increases, and heat exchange between the outside air and the first outdoor heat exchanger 3a cannot be sufficiently performed. It becomes difficult for the outdoor heat exchanger 3a to radiate heat. Therefore, the temperature around the first temperature thermistor 2a for detecting the outside air temperature arranged in the vicinity of the first outdoor heat exchanger 3a is warmed by not flowing, and the temperature detected by the first temperature thermistor 2a is When the outdoor heat exchanger 3a is normal, the temperature is higher than the temperature detected by the first temperature thermistor 2a. As a result, the temperature calculated from the pressure detected by the first discharge refrigerant pressure sensor 6a is substantially equal to the temperature of the first temperature thermistor 2a.

そのため、第一温度サーミスタ２aが検出した温度と、第一吐出冷媒用圧力センサー６aが検出した圧力から算出される温度を比較し、所定の温度差未満であるか否かで、第一室外熱交換器３aが目詰まりしているか否かを検出することが出来る。しかし、同一の冷凍サイクル内に室外機が複数接続されている場合、停止している室外機の影響で圧縮機から吐出する冷媒の温度や圧力が変化する。その為、第一温度サーミスタ２aは吐出する冷媒の温度や圧力など室外機内の熱の影響を受けて、第一温度サーミスタ２aが検出する温度は変動することがある。その為、第一温度サーミスタ２aの値が正常値と違う場合、目詰まりの誤検出をするおそれがある。そこで、目詰まりの誤検出を防ぐ為に、第一温度サーミスタ２aと第二温度サーミスタ２bの温度差が所定の温度未満の時に目詰まり検出を行う。   Therefore, the temperature detected by the first temperature thermistor 2a and the temperature calculated from the pressure detected by the first discharge refrigerant pressure sensor 6a are compared, and it is determined whether or not the first outdoor heat is less than a predetermined temperature difference. It can be detected whether or not the exchanger 3a is clogged. However, when a plurality of outdoor units are connected in the same refrigeration cycle, the temperature and pressure of refrigerant discharged from the compressor change due to the influence of the stopped outdoor unit. Therefore, the temperature detected by the first temperature thermistor 2a may fluctuate due to the influence of heat in the outdoor unit such as the temperature and pressure of the refrigerant to be discharged. Therefore, if the value of the first temperature thermistor 2a is different from the normal value, clogging may be erroneously detected. Therefore, in order to prevent erroneous detection of clogging, clogging is detected when the temperature difference between the first temperature thermistor 2a and the second temperature thermistor 2b is less than a predetermined temperature.

本発明の空気調和機で、第一室外熱交換器３aが目詰まりしているか否かを検出する手順について、図４のフローチャートを基に説明する。なお、室外機を長期間停止すると、ゴミやホコリなどがたまり、室外熱交換器は目詰まりを起こしやすい。その為、本実施例では、室外機を起動した時に目詰まり検出を行い、また、室外機が運転中は１時間おきに目詰まり検出を行っている。本発明の空気調和機において、第一室外熱交換器３aが目詰まりし、第一温度サーミスタ２aと第二温度サーミスタ２bが共に外気温を正常に検出している場合について、以下に第一室外熱交換器３aが目詰まりしているか否かを検出する手順を説明する。   A procedure for detecting whether or not the first outdoor heat exchanger 3a is clogged in the air conditioner of the present invention will be described based on the flowchart of FIG. Note that if the outdoor unit is stopped for a long period of time, dust, dust, etc. accumulate, and the outdoor heat exchanger is likely to be clogged. For this reason, in this embodiment, clogging is detected when the outdoor unit is started, and clogging is detected every hour while the outdoor unit is in operation. In the air conditioner of the present invention, when the first outdoor heat exchanger 3a is clogged and both the first temperature thermistor 2a and the second temperature thermistor 2b detect the outside air temperature normally, the first outdoor A procedure for detecting whether or not the heat exchanger 3a is clogged will be described.

図４のフローチャートは、第一室外熱交換器３aが目詰まりしているか否かを検出する為の検出する手順を示すものである。図４に示すように、判断部は、室外機７a内にある第一温度サーミスタ２aが検出した温度T2aを取得する（ステップS1）。検出対象である室外機７a以外の室外機の内、稼動している室外機７b内にある第二室外熱交換器３b近傍に配置した外気温を検出する為の第二温度サーミスタ２bで検出した温度T2bを、通信回線を介して取得する（ステップS2）。そして、両者の温度差である第二の温度差、つまり、（T2a−T2b）の絶対値（図４では|T2a−T2b|で示す。以下の絶対値の表現も同様に示す。）を算出する（ステップS3）。図２の表に示しているように、算出した（T2a−T2b）の絶対値が、予め設定された第二の所定温度差である５度未満であるか否かを判断し（ステップS4）、５度未満である場合は次のステップS５に進み、５度以上である場合は検出を終了する。本実施例では、第一温度サーミスタ２aと第二温度サーミスタ２bが共に外気温を検出している為、両者の温度差が無く、算出した（T2a−T2b）の絶対値が５度未満となる。例えば、T2aが３４度で、T2bが３３度であった場合、（T2a−T2b）の絶対値、１度を算出する。算出した絶対値１度は、第二の所定温度差である５度未満となり、ステップS5に進む。   The flowchart of FIG. 4 shows a detection procedure for detecting whether or not the first outdoor heat exchanger 3a is clogged. As shown in FIG. 4, the determination unit acquires the temperature T2a detected by the first temperature thermistor 2a in the outdoor unit 7a (step S1). Detected by the second temperature thermistor 2b for detecting the outside air temperature arranged in the vicinity of the second outdoor heat exchanger 3b in the outdoor unit 7b that is operating among the outdoor units other than the outdoor unit 7a to be detected. The temperature T2b is acquired through the communication line (step S2). Then, a second temperature difference that is the temperature difference between them, that is, an absolute value of (T2a−T2b) (indicated by | T2a−T2b | in FIG. 4, the following expression of the absolute value is also shown) is calculated. (Step S3). As shown in the table of FIG. 2, it is determined whether or not the calculated absolute value of (T2a−T2b) is less than 5 degrees, which is a second predetermined temperature difference set in advance (step S4). If it is less than 5 degrees, the process proceeds to the next step S5, and if it is 5 degrees or more, the detection ends. In this embodiment, since the first temperature thermistor 2a and the second temperature thermistor 2b both detect the outside air temperature, there is no temperature difference between them, and the calculated absolute value of (T2a−T2b) is less than 5 degrees. . For example, when T2a is 34 degrees and T2b is 33 degrees, the absolute value of (T2a−T2b) is calculated as 1 degree. The calculated absolute value of 1 degree is less than 5 degrees that is the second predetermined temperature difference, and the process proceeds to step S5.

判断部は、ステップS5に進んだ後、図４に示すように、室外機７a内にある第一温度サーミスタ２aが検出した温度T2aを取得する（ステップS5）。第一吐出冷媒用圧力センサー６aが検出した圧力から飽和温度T6aを算出する（ステップS6）。そして、両者の温度差である第一の温度差、つまり、（T2a−T6a）の絶対値（図４では|T2a−T6a|で示す。）を算出する（ステップS7）。図３の表に示しているように、判断部は、算出した（T2a−T6a）の絶対値が予め設定された第一の所定温度差である３度未満であるか否かを判断し（ステップS8）、３度未満である場合（S8-yes）は第一室外熱交換器３aが目詰まりしていると判断し（ステップS9）、３度以上である場合（S8-no）は第一室外熱交換器３aが正常であると判断する（ステップS10）。本実施例では、第一室外熱交換器３aが目詰まりしている為、算出した（T2a−T6a）の絶対値が３度未満であり、第一室外熱交換器３aが目詰まりしていると判断する（ステップS9）。そして、判断部は、室内機の表示部に第一室外熱交換器３aが目詰まりしていることを表示して使用者に知らせている。   After proceeding to step S5, the determination unit acquires the temperature T2a detected by the first temperature thermistor 2a in the outdoor unit 7a as shown in FIG. 4 (step S5). A saturation temperature T6a is calculated from the pressure detected by the first discharge refrigerant pressure sensor 6a (step S6). Then, a first temperature difference that is the temperature difference between them, that is, an absolute value of (T2a−T6a) (indicated by | T2a−T6a | in FIG. 4) is calculated (step S7). As shown in the table of FIG. 3, the determination unit determines whether or not the calculated absolute value of (T2a−T6a) is less than 3 degrees that is a preset first predetermined temperature difference ( Step S8) If it is less than 3 degrees (S8-yes), it is determined that the first outdoor heat exchanger 3a is clogged (Step S9), and if it is 3 degrees or more (S8-no) It is determined that the outdoor heat exchanger 3a is normal (step S10). In the present embodiment, since the first outdoor heat exchanger 3a is clogged, the calculated absolute value of (T2a-T6a) is less than 3 degrees, and the first outdoor heat exchanger 3a is clogged. (Step S9). And the judgment part displays on the display part of an indoor unit that the 1st outdoor heat exchanger 3a is clogged, and notifies a user.

なお、上記実施例では、第一室外熱交換器３aが目詰まりしている場合について説明したが、第一室外熱交換器３aが目詰まりしていなく、第一温度サーミスタ２aと第二温度サーミスタ２bが共に外気温を検出している場合について、以下に説明する。ステップS8までは上記と同様に進むが、（T2a−T6a）の絶対値が３度以上となる為（S8-no）、第一室外熱交換器３aが正常であると判断（ステップS10）する。   In addition, although the said Example demonstrated the case where the 1st outdoor heat exchanger 3a was clogged, the 1st outdoor heat exchanger 3a is not clogged, and the 1st temperature thermistor 2a and the 2nd temperature thermistor A case where both 2b detect the outside air temperature will be described below. The process proceeds to step S8 in the same manner as described above. However, since the absolute value of (T2a-T6a) is 3 degrees or more (S8-no), it is determined that the first outdoor heat exchanger 3a is normal (step S10). .

なお、（T2a−T2b）の絶対値が５度以上となる場合（S4-no）について、以下に説明する。第一温度サーミスタ２aと第二温度サーミスタ２bが共に外気温を検出できない、または、片方だけ外気温を検出できない場合が該当する。ステップS4まで上記と同様に進むが、両者の温度サーミスタの測定対象が外気温でなく、測定対象が例えば熱交換器の配管温度などを検出すると外気温と異なる為、両者の温度に温度差が出来る。よって、（T2a−T2b）の絶対値が５度以上となり（S4-no）、目詰まり検出を終了する。   The case where the absolute value of (T2a-T2b) is 5 degrees or more (S4-no) will be described below. This corresponds to the case where both the first temperature thermistor 2a and the second temperature thermistor 2b cannot detect the outside air temperature, or only one of them cannot detect the outside air temperature. Proceed in the same way as above until step S4, but the temperature thermistor does not measure the outside air temperature, and if the object to be measured detects, for example, the heat exchanger piping temperature, it differs from the outside air temperature. I can do it. Therefore, the absolute value of (T2a-T2b) becomes 5 degrees or more (S4-no), and the clogging detection is terminated.

なお、本実施例では、図２の表に記載のとおり予め設定された第二の所定温度差を５に設定しているが、本発明はこれに限定したものではなく、室外機（７a、７b）の設置環境などに応じて、この第二の所定温度差を５よりも大きくしたり、５よりも小さくしたりしても良い。   In the present embodiment, the second predetermined temperature difference preset as shown in the table of FIG. 2 is set to 5. However, the present invention is not limited to this, and the outdoor unit (7a, The second predetermined temperature difference may be larger than 5 or smaller than 5 depending on the installation environment of 7b).

同様に、本実施例では、図３の表に記載のとおり予め設定された第一の所定温度差を３に設定しているが、本発明はこれに限定したものではなく、室外機（７a、７b）の設置環境などに応じて、この第一の所定温度差を３よりも大きくしたり、３よりも小さくしたりしても良い。   Similarly, in the present embodiment, the first predetermined temperature difference preset as shown in the table of FIG. 3 is set to 3, but the present invention is not limited to this, and the outdoor unit (7a 7b), the first predetermined temperature difference may be made larger than 3 or smaller than 3.

なお、本実施例では、判断部が、第一室外熱交換器３aが目詰まりをしていると判断した場合、室内機の表示部に第一室外熱交換器３aが目詰まりしていることを表示して使用者に知らせているが、本発明はこれに限定したものではなく、室内機内にあるアラーム音を鳴らして使用者に目詰まりを知らせても良い。   In this embodiment, when the determination unit determines that the first outdoor heat exchanger 3a is clogged, the first outdoor heat exchanger 3a is clogged in the display unit of the indoor unit. However, the present invention is not limited to this, and an alarm sound in the indoor unit may be sounded to notify the user of clogging.

上記実施例では、２台の室外機が稼動している場合の実施例を示しているが、本発明は２台に限定したものではなく、３台以上の複数台の室外機であっても良い。   In the said Example, although the Example when the two outdoor units are working is shown, this invention is not limited to two units, Even if it is three or more outdoor units, good.

なお、室外機７aが１台しか稼動していない場合については以下の方法で第一室外熱交換器３aが目詰まりしているか否かを判断する。   In the case where only one outdoor unit 7a is operating, it is determined whether or not the first outdoor heat exchanger 3a is clogged by the following method.

まず初めに、第一室外熱交換器３aの検出を開始する時に、停止中の室外機７bを稼動させる。そして、判断部が、上記の目詰まり方法と同じ様に第一温度サーミスタ２aが検出した温度T2aと、室外機７b内にある第二温度サーミスタ２bが検出した温度T2bとの温度差である第二の温度差、（T2a−T2b）の絶対値を算出し、その（T2a−T2b）の絶対値が第一の所定温度である５度未満であるか否かを判断する。５度未満である場合は、上記と同様に、室外機７a内にある第一温度サーミスタ２aが検出した温度T2aと、第一吐出冷媒用圧力センサー６aが検出した圧力から算出した飽和温度T6aとの温度差である第一の温度差を算出し、第二の所定温度である３度未満であるか否かを判断することで、第一室外熱交換器３aが目詰まりしているか否かを判断する。この方法で、室外機７aしか稼動していない場合でも、第一室外熱交換器３aの目詰まりを精度良く検出することが出来る。   First, when the detection of the first outdoor heat exchanger 3a is started, the stopped outdoor unit 7b is operated. Then, the determination unit is the temperature difference between the temperature T2a detected by the first temperature thermistor 2a and the temperature T2b detected by the second temperature thermistor 2b in the outdoor unit 7b as in the above-described clogging method. The absolute value of the difference between the two temperatures, (T2a−T2b), is calculated, and it is determined whether or not the absolute value of (T2a−T2b) is less than the first predetermined temperature of 5 degrees. When the angle is less than 5 degrees, similarly to the above, the temperature T2a detected by the first temperature thermistor 2a in the outdoor unit 7a and the saturation temperature T6a calculated from the pressure detected by the first discharge refrigerant pressure sensor 6a Whether or not the first outdoor heat exchanger 3a is clogged is calculated by calculating the first temperature difference which is the temperature difference of the second and determining whether or not it is less than 3 degrees which is the second predetermined temperature. Judging. With this method, even when only the outdoor unit 7a is operating, it is possible to accurately detect clogging of the first outdoor heat exchanger 3a.

なお、室外機が１台しかない場合については、図４のフローチャート、ステップS5から目詰まり検出を始めることで、室外熱交換器の目詰まりを検出することが出来る。   When there is only one outdoor unit, the clogging of the outdoor heat exchanger can be detected by starting the clogging detection from the flowchart of FIG. 4, step S5.

１a 第一圧縮機
１b 第二圧縮機
２a 第一温度サーミスタ
２b 第二温度サーミスタ
３a 第一室外熱交換器
３b 第二室外熱交換器
４a、４b、４c 室内熱交換器
５a、５b アキュームレータ
６a 第一吐出冷媒用圧力センサー
６b 第二吐出冷媒用圧力センサー
７a 第一室外機
７b 第二室外機
８a、８b、８c 膨張弁 1a 1st compressor 1b 2nd compressor 2a 1st temperature thermistor 2b 2nd temperature thermistor 3a 1st outdoor heat exchanger 3b 2nd outdoor heat exchanger 4a, 4b, 4c indoor heat exchanger 5a, 5b accumulator 6a 1st Pressure sensor for discharged refrigerant 6b Pressure sensor for second discharged refrigerant 7a First outdoor unit 7b Second outdoor unit 8a, 8b, 8c Expansion valve

Claims (2)

圧縮機、室外熱交換器を設けた室外機を備えた空気調和機であって、
第一圧縮機と、第一室外熱交換器と、前記第一圧縮機から吐出された冷媒圧力を検出する第一冷媒圧力検出手段と、前記第一室外熱交換器の近傍に配置されている第一温度検出手段とを備えた第一室外機と、
前記第一室外熱交換器の目詰まりを判断する判断手段と、
を備え、
かつ、前記判断手段は、前記第一冷媒圧力検出手段で検出した圧力から飽和温度を算出し、
かつ、前記判断手段は、前記飽和温度と前記第一温度検出手段で検出した温度との温度差である第一の温度差を算出し、
前記第一の温度差が第一の所定温度未満である場合、
前記判断手段は、前記第一室外機の前記第一室外熱交換器が目詰まりしていると判断することを特徴とする空気調和機。 An air conditioner including an outdoor unit provided with a compressor and an outdoor heat exchanger,
The first compressor, the first outdoor heat exchanger, the first refrigerant pressure detecting means for detecting the refrigerant pressure discharged from the first compressor, and the first outdoor heat exchanger are disposed in the vicinity. A first outdoor unit comprising a first temperature detecting means;
Determining means for determining clogging of the first outdoor heat exchanger;
With
And the said judgment means calculates saturation temperature from the pressure detected by said 1st refrigerant | coolant pressure detection means,
And the said judgment means calculates the 1st temperature difference which is a temperature difference of the said saturation temperature and the temperature detected by the said 1st temperature detection means,
When the first temperature difference is less than a first predetermined temperature,
The air conditioner characterized in that the determination means determines that the first outdoor heat exchanger of the first outdoor unit is clogged. 前記空気調和機は、
第二圧縮機と、第二室外熱交換器と、前記第二圧縮機から吐出された冷媒圧力を検出する第二冷媒圧力検出手段と、前記第二室外熱交換器の近傍に配置されている第二温度検出手段とを備えた第二室外機と、
をさらに備え、
前記判断手段は、前記第一温度検出手段で検出した温度と前記第二温度検出手段で検出した温度との温度差である第二の温度差を算出し、
前記第二の温度差が第二の所定温度未満である場合、
前記判断手段は、前記第一の温度差を算出し、前記第一の温度差から前記第一室外機の第一室外熱交換器が目詰まりしていると判断することを特徴とする請求項１に空気調和機。
The air conditioner
The second compressor, the second outdoor heat exchanger, the second refrigerant pressure detecting means for detecting the refrigerant pressure discharged from the second compressor, and the second outdoor heat exchanger are disposed in the vicinity. A second outdoor unit comprising a second temperature detection means;
Further comprising
The determination means calculates a second temperature difference that is a temperature difference between the temperature detected by the first temperature detection means and the temperature detected by the second temperature detection means,
When the second temperature difference is less than a second predetermined temperature,
The determination means calculates the first temperature difference, and determines from the first temperature difference that the first outdoor heat exchanger of the first outdoor unit is clogged. 1 is an air conditioner.
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