JP3991202B2

JP3991202B2 - Air conditioner

Info

Publication number: JP3991202B2
Application number: JP2002093941A
Authority: JP
Inventors: 泰隆村上
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2002-03-29
Filing date: 2002-03-29
Publication date: 2007-10-17
Anticipated expiration: 2022-03-29
Also published as: JP2003287262A

Description

【０００１】
【発明の属する技術分野】
本発明は、空気調和機に関わり、特に再熱除湿運転を行うな空気調和機に関する。
【０００２】
【従来の技術】
図９は、従来の再熱除湿運転を行う空気調和機の構成図である。この空気調和機は、圧縮機１、四方切替弁１８、室外熱交換器２、第１の冷媒減圧装置３、第１の室内熱交換器４、室内の絞り機構である第２の冷媒減圧装置５、第２の室内熱交換器６を主配管を介して順次接続した冷凍サイクルを備え、室内熱交換器を、第２の冷媒減圧装置５を挟んで第１の室内熱交換器４と第２の室内熱交換器６の２つの熱交換器に分けたものである。
【０００３】
通常冷房運転においては、第１の冷媒減圧装置３を絞り、第２の冷媒減圧装置５を全開にして、第１の室内熱交換器４と第２の室内熱交換器６を蒸発器にする。
また、冷え過ぎを防止しながら湿度を下げるための再熱除湿運転として、第１の冷媒減圧装置３を全開にして、第２の冷媒減圧装置５を絞って、第１の室内熱交換器４を凝縮器、第２の室内熱交換器６を蒸発器にして、同一能力における顕熱比を下げて、室温を下げないで除湿を行う再熱除湿運転があり、その制御方法は、圧縮機１の周波数を可変することにより湿度をコントロールし、室外送風機８のファン速度を可変することにより室温をコントロールする。
【０００４】
再熱除湿運転においては、図１０、図１１に示すように、室外送風機８のファン速度、または外気温度によってモリエル線図は大きく異なる。室外送風機８のファン速度が増加（図１０では、「外風量ｕｐ」と記載）した場合、または外気温度が低下（図１１では、「外気温低」と記載）した場合、室外熱交換器２の凝縮量は室外凝縮量Ａから、室外凝縮量Ｂへと増加し、室内凝縮量は低下する。即ち、同一圧縮機周波数においては、冷媒循環量はほぼ同一であり、第１の冷媒減圧装置３の絞り量はほぼ同一となり、第１の室内熱交換器４の凝縮量は、室内凝縮量Ａから室内凝縮量Ｂへと減少する。
また、第１の室内熱交換器４の凝縮温度も低下し、第２の室内熱交換器６の蒸発温度も低下する。
【０００５】
一方、再熱除湿運転において、図１２の空気線図を見ると、室内凝縮温度と、室内蒸発温度から室内吹出し温度は決定され、室外送風機８のファン速度、または外気温度によって室内凝縮温度、室内蒸発温度は低下したり、上昇したりする。
つまり、室温を下げたい場合には、室外送風機８のファン速度をあげ（図１２では、「ファン速高」と記載）、また室温を上げたい場合には室外送風機８のファン速度を低下（図１２では、「ファン速低」と記載）させる運転を行う。このように室外送風機８のファン速度によって室内温度をコントロールする。
【０００６】
【発明が解決しようとする課題】
しかしながら、室外送風機８のファン速度をコントロールする場合には、室外送風機８の電動機にコストのかかる直流電動機（ＤＣファンモータ）を使用する必要があるため、製造コストが高くなり、廉価機種に再熱除湿運転を展開しにくいという問題があった。
【０００７】
本発明は、製造コストを押えた再熱除湿運転を行う空気調和機を得ることを目的とする。
【０００８】
【課題を解決するための手段】
本発明の請求項１に係わる空気調和機は、圧縮機、四方切替弁、室外熱交換器、第１の冷媒減圧装置、第１の室内熱交換器、第２の冷媒減圧装置、第２の室内熱交換器を冷媒配管で順次接続した冷媒回路と、室外熱交換器の室外送風機と、室内熱交換器の室内送風機と、室外温度を検出する室外温度検出器と、室内吹出し温度を検出する室内吹出し温度検出手段と、制御手段と、を備えたヒートポンプ式空気調和機であって、室外送風機の室外ファンを回転させる電動機を誘導電動機とし、制御手段は、目標吹出し温度を設定して、室内吹出し温度検出手段の検出結果に基づいて誘導電動機をＯＮ、ＯＦＦ制御し、室外ファンを目標吹出し温度の上限値と下限値間でＯＮ、ＯＦＦの断続運転させることにより再熱除湿運転を行い、目標吹出し温度を上げたい場合には、目標吹出し温度の上限値を第１の値だけ高くし、目標吹出し温度を下げたい場合には、目標吹出し温度の下限値を第２の値だけ低くするものである。
【０００９】
また、請求項２に係わる空気調和機は、請求項１の空気調和機において、前記制御手段に代えて、目標吹出し温度を設定し、誘導電動機をＯＮ、ＯＦＦ制御して室外ファンを目標吹出し温度の上限値と下限値間でＯＮ、ＯＦＦの断続運転させることにより再熱除湿運転を行い、室外温度検出器によって検出された外気温度が所定値より高い場合には、目標吹出し温度の下限値を所定値だけ下げ、室外温度検出器によって検出された外気温度が所定値より低い場合には、目標吹出し温度の上限値を所定値だけ上げる制御手段を備えたものである。
【００１０】
また、請求項３に係わる空気調和機は、請求項１の空気調和機において、前記制御手段に代えて、目標吹出し温度を設定し、誘導電動機をＯＮ、ＯＦＦ制御して室外ファンを目標吹出し温度の上限値と下限値間でＯＮ、ＯＦＦの断続運転させることにより再熱除湿運転を行い、目標吹出し温度の上限値まで室外ファンをＯＦＦとする制御をしている場合、制御手段の電気部品が所定の温度以上に上昇したら、目標吹出し温度の上限値を所定の値だけ下げる制御手段を備えたものである。
【００１１】
請求項４に係わる空気調和機は、請求項１の空気調和機において、前記制御手段に代えて、目標吹出し温度を設定し、誘導電動機をＯＮ、ＯＦＦ制御して室外ファンを目標吹出し温度の上限値と下限値間でＯＮ、ＯＦＦの断続運転させることにより再熱除湿運転を行い、室外ファンがＯＦＦの場合に、圧縮機の周波数を所定量上げる制御手段を備えたものである。
請求項５に係わる空気調和機は、請求項１の空気調和機において、前記制御手段に代えて、目標吹出し温度を設定し、誘導電動機をＯＮ、ＯＦＦ制御して室外ファンを目標吹出し温度の上限値と下限値間でＯＮ、ＯＦＦの断続運転させることにより再熱除湿運転を行い、外気温度検出手段が検出した外気温度が所定値以上の場合、室外ファンがＯＦＦの時に、圧縮機の運転周波数を所定数下げる制御手段を備えたものである。
【００１２】
【発明の実施の形態】
実施の形態１．
図１は、実施の形態の空気調和機の構成図を示す。
図において、１は圧縮機、１８は四方切替弁、２は室外熱交換器、３は第１の冷媒減圧装置、４は第１の室内熱交換器、５は室内の絞り機構である第２の冷媒減圧装置、６は第２の室内熱交換器であり、これらを主配管により接続して、冷凍サイクルを構成する。室内熱交換器は、第２の冷媒減圧装置５を挟んで第１の室内熱交換器４と第２の室内熱交換器６の２つの熱交換器に分かれている。
【００１３】
また、７は室内送風機、８は室外送風機であり、室外送風機８の室外ファン回転の電動機には誘導電動機を使用する。１１は室内湿度センサーであり、ここでは相対湿度センサーを用いている。１２は室温センサーである室温サーミスタ、１３は第１の室内熱交換器４の管温センサーであり、凝縮器として使用する場合の凝縮温サーミスタ、１４は第２の室内熱交換器６の管温センサーであり、蒸発器として使用する場合の蒸発温サーミスタ、１７は吹出し温度センサーである吹出し温サーミスタ、１５は外気温センサーである外気温サーミスタ、１６はリモコンである。
【００１４】
ここで、室内制御部（図の室内マイコン９）は、上記湿度センサー１１、室温センサー１２、第１、第２の室内熱交換器４、６の管温センサー１３、１４、リモコン受光部、室外制御部（図の室外マイコン１０）からの情報により、第２の冷媒減圧装置５、室内送風機７を制御する。
さらに、室内制御部は室外制御部に第２の冷媒減圧装置５の開閉動作、室内送風機７のファン回転数を送信し、室外制御部は、前記情報と外気温センサー１５により、圧縮機１の周波数、さらに室外送風機８のファン回転数を制御する。
【００１５】
次に、再熱除湿運転における室温の制御について説明する。
従来は再熱除湿運転において、室温を制御する場合には、リモコン１６の設定温度と、室温センサー１２の温度差に応じて室外送風機８のファン速度を制御する。
室温センサー１２の検出温度がリモコン１６の設定よりある一定値高い場合には、直流電動機によって室外送風機８の室外ファン速度を上げて（図１０では、室外ファン速度を上げる場合を「外風量ｕｐ」、下げる場合を「外風量ｄｏｗｎ」と記載）、図１０のように室外凝縮量を増加（室外凝縮量ＡからＢ）させ、室内凝縮温度、室内蒸発温度を低下させ、吹出し温度を下げる運転を行う。
一方、室温センサー１２の検出温度がリモコン１６の設定よりある一定値低い場合には、直流電動機によって室外送風機８の室外ファン速度を下げて、図１０のように室外凝縮量を低下（室外凝縮量ＢからＡ）させ、室内凝縮温度、室内蒸発温度を上昇させ、吹出し温度を上げる運転を行う。
【００１６】
直流電動機は、冷房運転や暖房運転などで使う高速回転領域から、再熱除湿運転で使う低速回転領域まで、ファン回転数の制御範囲が広く使える。一方、誘導電動機の場合、ファン回転数の制御範囲が狭いため、冷房運転や暖房運転で使う高速回転領域にファン回転数を設定すると、再熱除湿運転でも高速回転となってしまい、室外凝縮量が増加し、室内凝縮温度、室内蒸発温度が低下するため吹出し温度が下がり、室温が低下してしまう再熱除湿運転となる。
【００１７】
従って、室外送風機８に誘導電動機を用いた再熱除湿運転の場合、誘導電動機をＯＮ、ＯＦＦ制御して、室外送風機８をＯＮ、ＯＦＦの断続運転をさせる。
室外送風機８の室外ファンがＯＦＦの場合、図２に示す（図２では、室外ファンＯＮを「外ファンＯＮ」と、室外ファンＯＦＦを「外ファンＯＦＦ」と記載）ように、室外凝縮量が室外凝縮量Ｂから室外凝縮量Ａへと低下し、室内凝縮温度、室内蒸発温度が上がるため、図３に示す（図３では、室外ファンＯＮを「外ファンＯＮ」と、室外ファンＯＦＦを「外ファンＯＦＦ」と記載）ように、吹出し温度は上昇してくる。
一方、室外ファンがＯＮの場合、図２のように室外凝縮量が室外凝縮量Ａから室外凝縮量Ｂへと増加し、室内凝縮温度、室内蒸発温度が低下するため、図３のように吹出し温度は低下してくる。
【００１８】
このように、室外送風機８のファンをＯＮの時の吹出し温度、ＯＦＦの時の吹出し温度の平均値によって室温を制御する。なお、吹出し温度は、室内蒸発温度、凝縮温度の平均値から求めてもよいし、吹出し温度センサー１７を用いてもよい。
【００１９】
具体的な室温制御である吹出し温度の制御を図４により説明する。
リモコン１６の設定温度と、室温センサー１２の温度との温度差に応じて、空気調和機の目標吹出し温度を設定し、この目標吹出し温度の上限値Ａ及び下限値Ｂを設定する。そして、室外送風機８の室外ファン（図４では外ファンと記載）をＯＦＦさせて上限値Ａになった場合に、即ち、吹出し温度センサー１７が上限値Ａを検知すると、室内制御部９を経由して、室外制御部１０が誘導電動機をＯＮとし、室外ファンをＯＮ（回転）させ、次いで、下限値Ｂになった場合に、即ち、吹出し温度センサー１７が下限値Ｂを検知すると、同様に誘導電動機をＯＦＦとし、室外ファンをＯＦＦ（回転停止）させる。このようにして室外送風機８の室外ファンのＯＮ時間及びＯＦＦ時間が設定される。
【００２０】
また、室温を上げたい場合には、即ち、目標吹出し温度を上げたい場合には、上限値ＡをＡ２と高くし、室外ファンのＯＦＦ時間を長く取って、図２のように室外凝縮量を低下させて、室内凝縮温度及び室内蒸発温度を図３のように上げ、吹出し温度を上げる。
また、室温を下げたい場合には、即ち、目標吹出し温度を下げたい場合には、下限値ＢをＢ２と低くして、室外ファンのＯＮ時間を長く取って、図２のように室外凝縮量を増加させて、室内凝縮温度、及び室内蒸発温度を下げて、図３のように吹出し温度を下げる運転を行う。
【００２１】
次に、外気温度が高い場合の制御について説明する。
外気温度が高い場合には、図１１に示すように、外気温度が低い場合よりも室外凝縮量は減少し、室内凝縮温度、室内蒸発温度は上昇するため、吹出し温度は上がる。従って、外気温度が高い場合には室外ファンのＯＮ時間を長く取るように、図５の下限値Ｂの値を低くして（図５で、「外気高の時」の点線を下限値とする）、室外凝縮量を増加させて、室内凝縮温度、及び室内蒸発温度を下げて吹出し温度を下げる運転を行う。
また、外気温度が低い場合には、室外ファンのＯＦＦ時間を長く取るように、図５の上限値Ａの値を高くして（図５で、「外気低の時」の点線を上限値とする）、室外凝縮量を低下させて、室内凝縮温度、及び室内蒸発温度を上げて吹出し温度を上げる運転を行う。
【００２２】
次いで、室外制御部１０の電気部品の温度上昇防止対策について説明する。
目標吹出し温度によって決まった上限値に対して、室外ファンＯＦＦ時に（停止時に）、電気部品への冷却風が流れなくなるため、電気部品の温度が上昇し損傷する恐れがある。従って、室外ファンを停止させる場合には電気部品の温度がある一定値以下の場合に行うこととし、電気部品の温度がある一定値以上になった場合には、図６のように室外ファンＯＦＦを解除するようにする。なお、電気部品の温度は温度センサー（図示はなし）により測定し、測定結果は室外制御部へ送付される。
即ち、図６において、上限値Ａまで室外ファンをＯＦＦとする制御をしている場合、電気部品温度が所定の値に上昇したら、上限値を上限値Ａから下の点線（図６では、上限値Ａの手前と記載）まで下げ、室外ファンをＯＮとする。即ち、上限値Ａを所定量下げる。
【００２３】
さらに、室外ファンがＯＦＦ（停止）時には、図２のように蒸発温度も高くなるため、除湿量が低下することになる。従って図７のように、圧縮機１の運転周波数を上げ（図７では「周波数ｕｐ」と記載）、蒸発量を蒸発量Ａから蒸発量Ｂに増加させて蒸発温度を低下させ、除湿能力を上げる運転を行ってもよい。
【００２４】
また、外気温度がある一定値以上の時、室外ファンのＯＦＦ（停止）時には、圧縮機１の運転周波数が高いと、運転電流が高いため室外制御部１０の電気部品の温度が上昇しやすくなる。そこで、電気部品の損傷を防止するため、前記のように上限値を所定量下げる。このため、室外ファンのＯＦＦ時間が短くなり、吹出し温度が上がりやすくなる。
従って、外気温度がある一定値以上の場合、図８のように室外ファンＯＦＦ時に（図８では、室外ファンを「外ファン」と記載）、圧縮機１の運転周波数を所定数下げることによって、運転電流を抑制し、電気部品の温度上昇を抑制し、室外送風機８のファンのＯＦＦ時間を短くしない。そこで、吹出し温度の上昇を抑制することが可能となる。
【００２５】
以上のように、室外ファンに誘導電動機を用いた再熱除湿運転において、室外送風機８のファンのＯＮ、ＯＦＦ運転によって室温を下げすぎない除湿運転を行うことができる。
前記の目標吹出し温度を変える場合、上限値を上げたり、下限値を下げたりすることを記載したが、上限値を上げる代りに下限値を上げたり、両者を上げたり、また下限値を下げる代りに上限値を下げたり、両者を下げたりしてもよい。但し、ＯＮ、ＯＦＦの間隔が短か過ぎることのないよう注意が必要である。
なお、通常の冷房運転、暖房運転は、第１の冷媒弁圧装置３を絞り、室内の絞り機構である第２の冷媒減圧装置５を全開にし、四方切替弁１８を切替えて、第１の室内熱交換器４及び第２の室内熱交換器６を、それぞれ蒸発器、凝縮器とすることにより行う。
【００２６】
【発明の効果】
本発明の請求項１に係わる空気調和機は、圧縮機、四方切替弁、室外熱交換器、第１の冷媒減圧装置、第１の室内熱交換器、第２の冷媒減圧装置、第２の室内熱交換器を冷媒配管で順次接続した冷媒回路と、室外熱交換器の室外送風機と、室内熱交換器の室内送風機と、室外温度を検出する室外温度検出器と、室内吹出し温度を検出する室内吹出し温度検出手段と、制御手段と、を備えたヒートポンプ式空気調和機であって、室外送風機の室外ファンを回転させる電動機を誘導電動機とし、制御手段は、目標吹出し温度を設定して、室内吹出し温度検出手段の検出結果に基づいて誘導電動機をＯＮ、ＯＦＦ制御し、室外ファンを目標吹出し温度の上限値と下限値間でＯＮ、ＯＦＦの断続運転させることにより再熱除湿運転を行い、目標吹出し温度を上げたい場合には、目標吹出し温度の上限値を第１の値だけ高くし、目標吹出し温度を下げたい場合には、目標吹出し温度の下限値を第２の値だけ低くするので、室外ファンの電動機を誘導電動機としコストを低減し、再熱除湿運転中に、容易に室温調節が可能となる。
【００２７】
また、請求項２に係わる空気調和機は、請求項１の空気調和機において、前記制御手段に代えて、目標吹出し温度を設定し、誘導電動機をＯＮ、ＯＦＦ制御して室外ファンを目標吹出し温度の上限値と下限値間でＯＮ、ＯＦＦの断続運転させることにより再熱除湿運転を行い、室外温度検出器によって検出された外気温度が所定値より高い場合には、目標吹出し温度の下限値を所定値だけ下げ、室外温度検出器によって検出された外気温度が所定値より低い場合には、目標吹出し温度の上限値を所定値だけ上げる制御手段を備えたので、室外ファンの電動機を誘導電動機としてコストを低減し、再熱除湿運転中に、容易に室温調節が可能となる。
【００２８】
また、請求項３に係わる空気調和機は、請求項１の空気調和機において、前記制御手段に代えて、目標吹出し温度を設定し、誘導電動機をＯＮ、ＯＦＦ制御して室外ファンを目標吹出し温度の上限値と下限値間でＯＮ、ＯＦＦの断続運転させることにより再熱除湿運転を行い、目標吹出し温度の上限値まで室外ファンをＯＦＦとする制御をしている場合、制御手段の電気部品が所定の温度以上に上昇したら、目標吹出し温度の上限値を所定の値だけ下げる制御手段を備えたので、室外ファンのＯＦＦによる冷却風停止を中断し、電気部品の温度上昇による損傷を防止できる。
【００２９】
請求項４に係わる空気調和機は、請求項１の空気調和機において、前記制御手段に代えて、目標吹出し温度を設定し、誘導電動機をＯＮ、ＯＦＦ制御して室外ファンを目標吹出し温度の上限値と下限値間でＯＮ、ＯＦＦの断続運転させることにより再熱除湿運転を行い、室外ファンがＯＦＦの場合に、圧縮機の周波数を所定量上げる制御手段を備えたので、室外ファンがＯＦＦ時の除湿能力不足を防止したり、また、外気温度が高くかつ圧縮機の周波数が高い場合の電気部品の温度上昇を防止できる。
請求項５に係わる空気調和機は、請求項１の空気調和機において、前記制御手段に代えて、目標吹出し温度を設定し、誘導電動機をＯＮ、ＯＦＦ制御して室外ファンを目標吹出し温度の上限値と下限値間でＯＮ、ＯＦＦの断続運転させることにより再熱除湿運転を行い、外気温度検出手段が検出した外気温度が所定値以上の場合、室外ファンがＯＦＦの時に、圧縮機の運転周波数を所定数下げる制御手段を備えたので、吹出し温度の上昇を抑制することが可能となる。
【図面の簡単な説明】
【図１】本発明の実施の形態の空気調和機の構成図である。
【図２】本発明の実施の形態の空気調和機の室外送風機のＯＮ、ＯＦＦ時のモリエル線図である。
【図３】本発明の実施の形態の空気調和機の室外送風機のＯＮ、ＯＦＦ時の室内凝縮温度、室内蒸発温度、吹出し温度を示す空気線図である。
【図４】本発明の実施の形態の空気調和機の室外送風機のＯＮ、ＯＦＦによる吹出し温度の制御を示す図である。
【図５】本発明の実施の形態の空気調和機の外気温度と室外送風機のＯＮ、ＯＦＦによる吹出し温度の制御を示す図である。
【図６】本発明の実施の形態の空気調和機の電気部品保護と室外送風機のＯＮ、ＯＦＦによる吹出し温度の制御を示す図である。
【図７】空気調和機の圧縮機の運転周波数の違いによるモリエル線図である。
【図８】本発明の実施の形態の空気調和機の室外送風機のＯＦＦ中の圧縮機の周波数制御を示す図である。
【図９】従来の空気調和機の構成図である。
【図１０】空気調和機の室外送風機のファン速度の違いによるモリエル線図である。
【図１１】空気調和機の外気温度の違いによるモリエル線図である。
【図１２】空気調和機の室外送風機のファン速度の変化による室内凝縮温度、室内蒸発温度、吹出し温度を示す空気線図である。
【符号の説明】
１圧縮機、２室外熱交換器、３第１の冷媒減圧装置、４第１の室内熱交換器、５第２の冷媒減圧装置、６第２の室内熱交換器、７室内送風機、８室外送風機、１８四方切替弁。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioner, and more particularly to an air conditioner that does not perform a reheat dehumidifying operation.
[0002]
[Prior art]
FIG. 9 is a configuration diagram of an air conditioner that performs a conventional reheat dehumidification operation. The air conditioner includes a compressor 1, a four-way switching valve 18, an outdoor heat exchanger 2, a first refrigerant decompression device 3, a first indoor heat exchanger 4, and a second refrigerant decompression device that is an indoor throttle mechanism. 5. A refrigeration cycle in which the second indoor heat exchanger 6 is sequentially connected through the main pipe is provided, and the indoor heat exchanger is connected to the first indoor heat exchanger 4 and the second one with the second refrigerant decompression device 5 interposed therebetween. The two indoor heat exchangers 6 are divided into two heat exchangers.
[0003]
In the normal cooling operation, the first refrigerant pressure reducing device 3 is throttled, the second refrigerant pressure reducing device 5 is fully opened, and the first indoor heat exchanger 4 and the second indoor heat exchanger 6 are used as an evaporator. .
Further, as a reheat dehumidifying operation for reducing the humidity while preventing overcooling, the first refrigerant decompression device 3 is fully opened, the second refrigerant decompression device 5 is throttled, and the first indoor heat exchanger 4 And a second indoor heat exchanger 6 as an evaporator, there is a reheat dehumidification operation in which dehumidification is performed without lowering the room temperature by lowering the sensible heat ratio at the same capacity. The humidity is controlled by changing the frequency of 1, and the room temperature is controlled by changing the fan speed of the outdoor blower 8.
[0004]
In the reheat dehumidifying operation, as shown in FIGS. 10 and 11, the Mollier diagram varies greatly depending on the fan speed of the outdoor fan 8 or the outside air temperature. When the fan speed of the outdoor fan 8 is increased (described as “outside air volume up” in FIG. 10) or when the outdoor air temperature is decreased (described as “outside air temperature is low” in FIG. 11), the outdoor heat exchanger 2 The amount of condensation increases from the outdoor condensation amount A to the outdoor condensation amount B, and the indoor condensation amount decreases. That is, at the same compressor frequency, the refrigerant circulation amount is substantially the same, the throttle amount of the first refrigerant decompression device 3 is substantially the same, and the condensation amount of the first indoor heat exchanger 4 is the indoor condensation amount A. To the indoor condensation amount B.
Moreover, the condensation temperature of the 1st indoor heat exchanger 4 also falls, and the evaporation temperature of the 2nd indoor heat exchanger 6 also falls.
[0005]
On the other hand, in the reheat dehumidifying operation, when the air diagram of FIG. 12 is viewed, the indoor outlet temperature is determined from the indoor condensing temperature and the indoor evaporating temperature, and the indoor condensing temperature, the indoor air temperature is determined by the fan speed of the outdoor fan 8 or the outdoor air temperature. The evaporation temperature decreases or increases.
That is, when it is desired to lower the room temperature, the fan speed of the outdoor blower 8 is increased (in FIG. 12, “high fan speed”), and when it is desired to increase the room temperature, the fan speed of the outdoor blower 8 is decreased (see FIG. 12, an operation to be described as “fan speed low” is performed. Thus, the indoor temperature is controlled by the fan speed of the outdoor blower 8.
[0006]
[Problems to be solved by the invention]
However, when controlling the fan speed of the outdoor fan 8, it is necessary to use an expensive DC motor (DC fan motor) as the motor of the outdoor fan 8, which increases the manufacturing cost and reheats the inexpensive model. There was a problem that it was difficult to develop dehumidifying operation.
[0007]
An object of this invention is to obtain the air conditioner which performs the reheat dehumidification operation which suppressed manufacturing cost.
[0008]
[Means for Solving the Problems]
An air conditioner according to claim 1 of the present invention includes a compressor, a four-way switching valve, an outdoor heat exchanger, a first refrigerant decompression device, a first indoor heat exchanger, a second refrigerant decompression device, a second Refrigerant circuit in which indoor heat exchangers are sequentially connected by refrigerant piping, outdoor fan of outdoor heat exchanger, indoor fan of indoor heat exchanger , outdoor temperature detector for detecting outdoor temperature, and indoor blowout temperature are detected A heat pump type air conditioner comprising an indoor blowing temperature detection means and a control means, wherein an electric motor that rotates an outdoor fan of an outdoor blower is an induction motor, and the control means sets a target blowing temperature, oN the induction motor based on a detection result of the outlet air temperature detecting means, turns OFF control, have rows oN, the reheat dehumidification operation by intermittent operation of the OFF between the upper limit value of the target outlet air temperature of the outdoor fan and the lower limit value, Target blowing If you want to increase the degrees is the upper limit of the target discharge temperature as high as the first value, when it is desired to lower the target discharge temperature is to lower the lower limit of the target discharge temperature by a second value .
[0009]
An air conditioner according to claim 2 is the air conditioner according to claim 1, wherein instead of the control means, a target blowing temperature is set, and the induction motor is controlled to be turned on and off to control the outdoor fan to the target blowing temperature. oN between upper and lower limits, performs reheat dehumidification operation by Rukoto to intermittent operation to OFF, when the outside air temperature detected by the outdoor temperature detector is higher than a predetermined value, the target discharge lower limit value of the temperature When the outside air temperature detected by the outdoor temperature detector is lower than the predetermined value, the control means is provided for increasing the upper limit value of the target blowing temperature by the predetermined value .
[0010]
According to a third aspect of the present invention , in the air conditioner of the first aspect, in place of the control means, a target blowing temperature is set, and the induction motor is turned on and off to control the outdoor fan to the target blowing temperature. When the reheat dehumidifying operation is performed by intermittently turning ON and OFF between the upper limit value and the lower limit value of the outdoor fan and the outdoor fan is controlled to the upper limit value of the target blowing temperature, Control means for lowering the upper limit value of the target blowing temperature by a predetermined value when the temperature rises above a predetermined temperature.
[0011]
An air conditioner according to a fourth aspect of the present invention is the air conditioner according to the first aspect , wherein instead of the control means, a target blowing temperature is set, and the induction motor is turned on and off to control the outdoor fan to an upper limit of the target blowing temperature. A control means for performing a reheat dehumidifying operation by intermittently turning ON and OFF between a value and a lower limit value and increasing the frequency of the compressor by a predetermined amount when the outdoor fan is OFF is provided .
An air conditioner according to a fifth aspect is the air conditioner according to the first aspect, wherein instead of the control means, a target blowing temperature is set, the induction motor is controlled to be turned on and off, and the outdoor fan is set to an upper limit of the target blowing temperature. If the reheat dehumidification operation is performed by intermittent ON / OFF operation between the value and the lower limit value, and the outside air temperature detected by the outside air temperature detection means is higher than the specified value, the operating frequency of the compressor when the outdoor fan is off Is provided with control means for lowering the predetermined number.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
Drawing 1 shows the lineblock diagram of the air harmony machine of an embodiment.
In the figure, 1 is a compressor, 18 is a four-way switching valve, 2 is an outdoor heat exchanger, 3 is a first refrigerant decompression device, 4 is a first indoor heat exchanger, and 5 is an indoor throttle mechanism. The refrigerant decompression device 6 is a second indoor heat exchanger, which is connected by a main pipe to constitute a refrigeration cycle. The indoor heat exchanger is divided into two heat exchangers, a first indoor heat exchanger 4 and a second indoor heat exchanger 6, with the second refrigerant decompression device 5 interposed therebetween.
[0013]
Reference numeral 7 denotes an indoor fan, and 8 denotes an outdoor fan. An induction motor is used as an electric motor for rotating the outdoor fan of the outdoor fan 8. Reference numeral 11 denotes an indoor humidity sensor, which uses a relative humidity sensor. 12 is a room temperature thermistor which is a room temperature sensor, 13 is a tube temperature sensor of the first indoor heat exchanger 4, a condensation temperature thermistor when used as a condenser, and 14 is a tube temperature of the second indoor heat exchanger 6. The sensor is an evaporation temperature thermistor when used as an evaporator, 17 is a blowing temperature thermistor that is a blowing temperature sensor, 15 is an outside temperature thermistor that is an outside temperature sensor, and 16 is a remote controller.
[0014]
Here, the indoor control unit (the indoor microcomputer 9 in the figure) includes the humidity sensor 11, the room temperature sensor 12, the tube temperature sensors 13 and 14 of the first and second indoor heat exchangers 4 and 6, the remote control light receiving unit, and the outdoor unit. The second refrigerant decompression device 5 and the indoor blower 7 are controlled by information from the control unit (outdoor microcomputer 10 in the figure).
Further, the indoor control unit transmits the opening / closing operation of the second refrigerant decompression device 5 and the fan rotation speed of the indoor blower 7 to the outdoor control unit, and the outdoor control unit transmits the information on the compressor 1 by the information and the outside air temperature sensor 15. The frequency and further the fan rotation speed of the outdoor fan 8 are controlled.
[0015]
Next, control of room temperature in the reheat dehumidification operation will be described.
Conventionally, in the reheat dehumidifying operation, when the room temperature is controlled, the fan speed of the outdoor fan 8 is controlled according to the set temperature of the remote controller 16 and the temperature difference of the room temperature sensor 12.
When the detected temperature of the room temperature sensor 12 is higher than the setting of the remote controller 16 by a certain value, the outdoor fan speed of the outdoor fan 8 is increased by a DC motor (in FIG. 10, the case where the outdoor fan speed is increased is “outside air volume up”. In the case of lowering, the operation is described as “outside air amount down”), and the outdoor condensation amount is increased (outdoor condensation amount A to B) as shown in FIG. 10, the indoor condensation temperature and the indoor evaporation temperature are lowered, and the blowing temperature is lowered. Do.
On the other hand, when the detected temperature of the room temperature sensor 12 is lower than the setting of the remote controller 16 by a certain value, the outdoor fan speed of the outdoor fan 8 is lowered by the DC motor to reduce the outdoor condensation amount as shown in FIG. B to A) to increase the indoor condensing temperature and the indoor evaporating temperature, and to raise the blowing temperature.
[0016]
DC motors can be used in a wide range of fan rotation speeds, ranging from high-speed rotation areas used for cooling and heating operations to low-speed rotation areas used for reheat dehumidification operation. On the other hand, in the case of induction motors, the fan rotation speed control range is narrow, so setting the fan rotation speed in the high-speed rotation area used for cooling or heating operation results in high-speed rotation even in reheat dehumidification operation, and the amount of outdoor condensation Increases, and the indoor condensing temperature and the indoor evaporating temperature decrease, so that the blowing temperature decreases and the room temperature decreases.
[0017]
Therefore, in the case of the reheat dehumidifying operation using the induction motor for the outdoor fan 8, the induction motor is controlled to be turned on and off, and the outdoor fan 8 is turned on and off intermittently.
When the outdoor fan of the outdoor blower 8 is OFF, as shown in FIG. 2 (in FIG. 2, the outdoor fan ON is described as “outside fan ON” and the outdoor fan OFF is described as “outside fan OFF”), the outdoor condensation amount is Since the outdoor condensing amount B decreases to the outdoor condensing amount A and the indoor condensing temperature and the indoor evaporating temperature increase, it is shown in FIG. 3 (in FIG. 3, the outdoor fan ON is set to “outside fan ON” and the outdoor fan OFF is set to “ As described in “Outside fan OFF”), the blowing temperature rises.
On the other hand, when the outdoor fan is ON, the outdoor condensation amount increases from the outdoor condensation amount A to the outdoor condensation amount B as shown in FIG. 2, and the indoor condensation temperature and the indoor evaporation temperature decrease. The temperature will drop.
[0018]
Thus, the room temperature is controlled by the average value of the blowing temperature when the fan of the outdoor blower 8 is ON and the blowing temperature when it is OFF. The blowing temperature may be obtained from the average value of the indoor evaporation temperature and the condensation temperature, or the blowing temperature sensor 17 may be used.
[0019]
The control of the blowing temperature, which is a specific room temperature control, will be described with reference to FIG.
A target blowing temperature of the air conditioner is set according to a temperature difference between the set temperature of the remote controller 16 and the temperature of the room temperature sensor 12, and an upper limit value A and a lower limit value B of the target blowing temperature are set. When the outdoor fan of the outdoor blower 8 (described as an external fan in FIG. 4) is turned off to reach the upper limit value A, that is, when the blowout temperature sensor 17 detects the upper limit value A, the indoor fan is passed through. Then, when the outdoor control unit 10 turns on the induction motor, turns on (rotates) the outdoor fan, and then reaches the lower limit value B, that is, when the blowout temperature sensor 17 detects the lower limit value B, similarly. The induction motor is turned off and the outdoor fan is turned off (rotation stopped). In this way, the ON time and OFF time of the outdoor fan of the outdoor fan 8 are set.
[0020]
When it is desired to raise the room temperature, that is, when the target blowout temperature is desired to be raised, the upper limit value A is increased to A2 and the outdoor fan is turned off for a long time, so that the outdoor condensation amount is increased as shown in FIG. By lowering, the indoor condensing temperature and the indoor evaporating temperature are raised as shown in FIG. 3, and the blowing temperature is raised.
Further, when it is desired to lower the room temperature, that is, when it is desired to lower the target blowing temperature, the lower limit value B is lowered to B2, the outdoor fan is turned on longer, and the outdoor condensation amount as shown in FIG. Is increased, the indoor condensing temperature and the indoor evaporating temperature are lowered, and the operation for lowering the blowing temperature is performed as shown in FIG.
[0021]
Next, control when the outside air temperature is high will be described.
When the outside air temperature is high, as shown in FIG. 11, the outdoor condensation amount decreases and the room condensation temperature and the room evaporation temperature rise as compared with the case where the outside air temperature is low. Therefore, when the outdoor air temperature is high, the lower limit value B in FIG. 5 is lowered so that the outdoor fan is turned on longer (the dotted line “when the outside air is high” in FIG. 5 is set as the lower limit value). ), Increasing the outdoor condensation amount, lowering the indoor condensing temperature and the indoor evaporating temperature and lowering the blowing temperature.
Further, when the outside air temperature is low, the upper limit value A in FIG. 5 is increased so that the outdoor fan is off longer (in FIG. 5, the dotted line “when the outside air is low” is set as the upper limit value). The outdoor condensation amount is reduced, the indoor condensation temperature and the indoor evaporation temperature are raised, and the blowout temperature is raised.
[0022]
Next, measures for preventing the temperature rise of the electrical components of the outdoor control unit 10 will be described.
With respect to the upper limit determined by the target blowing temperature, when the outdoor fan is turned off (when stopped), the cooling air does not flow to the electric component, so that the temperature of the electric component rises and may be damaged. Accordingly, when the outdoor fan is stopped, it is performed when the temperature of the electrical component is equal to or lower than a certain value, and when the temperature of the electrical component exceeds a certain value, the outdoor fan is turned off as shown in FIG. To cancel. The temperature of the electrical component is measured by a temperature sensor (not shown), and the measurement result is sent to the outdoor control unit.
That is, in FIG. 6, when the outdoor fan is controlled to be turned off to the upper limit value A, when the electric component temperature rises to a predetermined value, the upper limit value is changed from the upper limit value A to a dotted line (in FIG. And the outdoor fan is turned on. That is, the upper limit value A is lowered by a predetermined amount.
[0023]
Furthermore, when the outdoor fan is turned off (stopped), the evaporation temperature also increases as shown in FIG. 2, so the dehumidification amount decreases. Therefore, as shown in FIG. 7, the operating frequency of the compressor 1 is increased (denoted as “frequency up” in FIG. 7), the evaporation amount is increased from the evaporation amount A to the evaporation amount B, the evaporation temperature is lowered, and the dehumidifying ability is increased. You may drive up.
[0024]
Further, when the outdoor air temperature is a certain value or more and the outdoor fan is OFF (stopped), if the operating frequency of the compressor 1 is high, the operating current is high, so the temperature of the electrical components of the outdoor control unit 10 is likely to rise. . Therefore, in order to prevent damage to the electrical components, the upper limit value is lowered by a predetermined amount as described above. For this reason, the OFF time of the outdoor fan is shortened, and the blowing temperature is likely to rise.
Therefore, when the outside air temperature is a certain value or more, when the outdoor fan is turned off as shown in FIG. 8 (in FIG. 8, the outdoor fan is described as “outside fan”), the operating frequency of the compressor 1 is decreased by a predetermined number, The operating current is suppressed, the temperature rise of the electrical components is suppressed, and the OFF time of the fan of the outdoor blower 8 is not shortened. Therefore, it is possible to suppress an increase in the blowing temperature.
[0025]
As described above, in the reheat dehumidifying operation using the induction motor as the outdoor fan, the dehumidifying operation in which the room temperature is not excessively lowered by the ON / OFF operation of the fan of the outdoor fan 8 can be performed.
When changing the target blowing temperature, the upper limit value is increased or the lower limit value is decreased, but instead of increasing the upper limit value, the lower limit value is increased, both are increased, or the lower limit value is decreased. The upper limit value may be lowered or both may be lowered. However, care must be taken so that the interval between ON and OFF is not too short.
In the normal cooling operation and heating operation, the first refrigerant valve pressure device 3 is throttled, the second refrigerant pressure reduction device 5 that is an indoor throttle mechanism is fully opened, the four-way switching valve 18 is switched, and the first The indoor heat exchanger 4 and the second indoor heat exchanger 6 are used as an evaporator and a condenser, respectively.
[0026]
【The invention's effect】
An air conditioner according to claim 1 of the present invention includes a compressor, a four-way switching valve, an outdoor heat exchanger, a first refrigerant decompression device, a first indoor heat exchanger, a second refrigerant decompression device, a second Refrigerant circuit in which indoor heat exchangers are sequentially connected by refrigerant piping, outdoor fan of outdoor heat exchanger, indoor fan of indoor heat exchanger , outdoor temperature detector for detecting outdoor temperature, and indoor blowout temperature are detected A heat pump type air conditioner comprising an indoor blowing temperature detection means and a control means, wherein an electric motor that rotates an outdoor fan of an outdoor fan is an induction motor, and the control means sets a target blowing temperature, oN the induction motor based on a detection result of the outlet air temperature detecting means, and OFF control, have rows oN, the reheat dehumidification operation by intermittent operation of the OFF between the upper limit value of the target outlet air temperature of the outdoor fan and the lower limit value, Target blowing If you want to increase the degrees is the upper limit of the target discharge temperature as high as the first value, when it is desired to lower the target discharge temperature, since the lower the lower limit of the target discharge temperature by a second value, the outdoor The fan motor is an induction motor, which reduces the cost and easily adjusts the room temperature during the reheat dehumidification operation.
[0027]
An air conditioner according to claim 2 is the air conditioner according to claim 1, wherein instead of the control means, a target blowing temperature is set, and the induction motor is controlled to be turned on and off to control the outdoor fan to the target blowing temperature. oN between upper and lower limits, performs reheat dehumidification operation by Rukoto to intermittent operation to OFF, when the outside air temperature detected by the outdoor temperature detector is higher than a predetermined value, the target discharge lower limit value of the temperature lowered by a predetermined value, when the outside air temperature detected by the outdoor temperature detector is lower than a predetermined value, since a control means to raise the target outlet air upper limit of the temperature by a predetermined value, induces the motor of the outdoor fan motor Thus, the cost can be reduced and the room temperature can be easily adjusted during the reheat dehumidification operation.
[0028]
According to a third aspect of the present invention , in the air conditioner of the first aspect, in place of the control means, a target blowing temperature is set, and the induction motor is turned on and off to control the outdoor fan to the target blowing temperature. When the reheat dehumidifying operation is performed by intermittently turning ON and OFF between the upper limit value and the lower limit value of the outdoor fan and the outdoor fan is controlled to the upper limit value of the target blowing temperature, When the temperature rises above a predetermined temperature, the control means for lowering the upper limit value of the target blowing temperature by a predetermined value is provided, so that the cooling air stoppage by turning off the outdoor fan is interrupted, and damage due to the temperature rise of the electrical components can be prevented.
[0029]
An air conditioner according to a fourth aspect of the present invention is the air conditioner according to the first aspect , wherein instead of the control means, a target blowing temperature is set, and the induction motor is turned on and off to control the outdoor fan to an upper limit of the target blowing temperature. When the outdoor fan is OFF, it is equipped with a control means that increases the frequency of the compressor when the outdoor fan is OFF. Insufficient dehumidifying capacity can be prevented, and an increase in the temperature of electrical components when the outside air temperature is high and the frequency of the compressor is high can be prevented.
An air conditioner according to a fifth aspect is the air conditioner according to the first aspect, wherein instead of the control means, a target blowing temperature is set, the induction motor is controlled to be turned on and off, and the outdoor fan is set to an upper limit of the target blowing temperature. If the reheat dehumidification operation is performed by intermittent ON / OFF operation between the value and the lower limit value, and the outside air temperature detected by the outside air temperature detection means is higher than the specified value, the operating frequency of the compressor when the outdoor fan is off Since the control means for lowering the predetermined number is provided, it is possible to suppress an increase in the blowing temperature.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an air conditioner according to an embodiment of the present invention.
FIG. 2 is a Mollier diagram when the outdoor fan of the air conditioner according to the embodiment of the present invention is turned on and off.
FIG. 3 is an air diagram showing the indoor condensing temperature, the indoor evaporating temperature, and the blowing temperature when the outdoor fan of the air conditioner according to the embodiment of the present invention is turned ON and OFF.
FIG. 4 is a diagram showing the control of the blowing temperature by turning on and off the outdoor blower of the air conditioner according to the embodiment of the present invention.
FIG. 5 is a diagram showing control of the outside temperature of the air conditioner according to the embodiment of the present invention and the blowing temperature by ON / OFF of the outdoor fan.
FIG. 6 is a diagram showing electric part protection of the air conditioner according to the embodiment of the present invention and control of the blowing temperature by ON / OFF of the outdoor fan.
FIG. 7 is a Mollier diagram according to the difference in operating frequency of the compressor of the air conditioner.
FIG. 8 is a diagram showing frequency control of the compressor during OFF of the outdoor fan of the air conditioner according to the embodiment of the present invention.
FIG. 9 is a configuration diagram of a conventional air conditioner.
FIG. 10 is a Mollier diagram according to a difference in fan speed of an outdoor fan of an air conditioner.
FIG. 11 is a Mollier diagram according to the difference in the outside air temperature of the air conditioner.
FIG. 12 is an air diagram showing the indoor condensing temperature, the indoor evaporating temperature, and the blowing temperature due to a change in fan speed of the outdoor fan of the air conditioner.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Compressor, 2 Outdoor heat exchanger, 3 1st refrigerant | coolant decompression device, 4th 1st indoor heat exchanger, 5 2nd refrigerant | coolant decompression device, 6 2nd indoor heat exchanger, 7 indoor air blower, 8 outdoor Blower, 18 four-way switching valve.

Claims

A refrigerant circuit in which a compressor, a four-way switching valve, an outdoor heat exchanger, a first refrigerant decompression device, a first indoor heat exchanger, a second refrigerant decompression device, and a second indoor heat exchanger are sequentially connected by a refrigerant pipe. An outdoor fan for the outdoor heat exchanger, an indoor fan for the indoor heat exchanger, an outdoor temperature detector for detecting the outdoor temperature, an indoor blowing temperature detecting means for detecting the indoor blowing temperature, and a control means. Heat pump air conditioner
An electric motor that rotates an outdoor fan of the outdoor fan is an induction motor,
The control means sets a target blowing temperature, and controls the induction motor to be turned on and off based on the detection result of the indoor blowing temperature detecting means to control the outdoor fan between the upper limit value and the lower limit value of the target blowing temperature. in ON, have row driving reheat dehumidification by intermittent operation to OFF,
When it is desired to increase the target blowing temperature, the upper limit value of the target blowing temperature is increased by a first value, and when the target blowing temperature is desired to be decreased, the lower limit value of the target blowing temperature is set to a second value. Air conditioner characterized by lowering only .

Instead of the control means,
Sets a target outlet air temperature, performs ON, the reheat dehumidification operation by Rukoto by intermittent operation of OFF the induction motor ON, the outdoor fan and OFF control between upper and lower limits of the target outlet air temperature,
When the outdoor temperature detected by the outdoor temperature detector is higher than a predetermined value, the lower limit value of the target blowing temperature is lowered by a predetermined value, and the outdoor temperature detected by the outdoor temperature detector is lower than the predetermined value The air conditioner according to claim 1 , further comprising control means for raising an upper limit value of the target blowing temperature by a predetermined value .

Instead of the control means,
A target blowing temperature is set, the induction motor is turned on and off, and the outdoor fan is intermittently turned on and off between the upper limit value and the lower limit value of the target blowing temperature to perform reheat dehumidification operation,
When the outdoor fan is controlled to be turned off to the upper limit value of the target blowing temperature, the upper limit value of the target blowing temperature is lowered by a predetermined value when the electrical components of the control means rise above a predetermined temperature. The air conditioner according to claim 1 , further comprising a control means .

Instead of the control means,
A target blowing temperature is set, the induction motor is turned on and off, and the outdoor fan is intermittently turned on and off between the upper limit value and the lower limit value of the target blowing temperature to perform reheat dehumidification operation,
The air conditioner according to claim 1 , further comprising control means for increasing a frequency of the compressor by a predetermined amount when the outdoor fan is OFF.

Instead of the control means,
A target blowing temperature is set, the induction motor is turned on and off, and the outdoor fan is intermittently turned on and off between the upper limit value and the lower limit value of the target blowing temperature to perform reheat dehumidification operation,
2. The control device according to claim 1, further comprising a control unit that lowers the operating frequency of the compressor by a predetermined number when the outdoor fan is OFF when the outside temperature detected by the outside temperature detection unit is equal to or higher than a predetermined value. Air conditioner.