JP2014088977A

JP2014088977A - Air conditioning device

Info

Publication number: JP2014088977A
Application number: JP2012238035A
Authority: JP
Inventors: Hiroki Fujioka; 裕記藤岡; Atsushi Matsubara; 篤志松原; Takashige Mori; 隆滋森; Takahiro Nakata; 貴裕仲田
Original assignee: Daikin Industries Ltd
Current assignee: Daikin Industries Ltd
Priority date: 2012-10-29
Filing date: 2012-10-29
Publication date: 2014-05-15
Anticipated expiration: 2032-10-29
Also published as: JP5799932B2

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning device capable of executing a proper dehumidifying operation according to humidity load.SOLUTION: In an air conditioning device 1, a control portion 40 can execute a first dehumidifying operation and a second dehumidifying operation. The first dehumidifying operation is an operation to dehumidify an air-conditioned space by controlling an opening of an expansion valve 104 so that evaporation of a refrigerant is almost completed at a refrigerant outlet 138 of an indoor heat exchanger 13. The second dehumidifying operation is an operation to dehumidify an air-conditioned space by controlling the opening of the expansion valve 104 so that the evaporation is completed in a region closer to a refrigerant inlet 131 rather than the refrigerant outlet 138 of the indoor heat exchanger 13. The control portion 40 executes the first defrosting operation when the difference between the humidity of the air-conditioned space and a target humidity is out of a prescribed range, and executes the second dehumidifying operation when the difference between the humidity of the air-conditioned space and the target humidity is within the prescribed range.

Description

本発明は、空気調和装置に関し、特に、室内温度の低下を抑制しつつ除湿を行うことができる空気調和装置に関する。 The present invention relates to an air conditioner, and more particularly to an air conditioner that can perform dehumidification while suppressing a decrease in indoor temperature.

近年、除湿運転時の冷え過ぎを解消するため、温度低下を抑制して除湿を行う空気調和装置が広く普及するようになった。例えば、特許文献１（特開平０９−０１４７２７号公報）に開示されている空気調和装置では、補助熱交換器のみで冷却することによって、室内温度を低下させずに除湿を行っている。 In recent years, in order to eliminate excessive cooling during the dehumidifying operation, an air conditioner that performs dehumidification while suppressing a temperature drop has been widely spread. For example, in the air conditioner disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 09-014727), dehumidification is performed without lowering the room temperature by cooling only with an auxiliary heat exchanger.

しかしながら、上記のような空気調和装置では、湿度負荷の高い条件において除湿運転を行った場合、除湿量が不足し、目標の湿度に到達するまでに時間がかかり過ぎる。 However, in the air conditioner as described above, when the dehumidifying operation is performed under a condition with a high humidity load, the dehumidifying amount is insufficient and it takes too much time to reach the target humidity.

本発明の課題は、湿度負荷に応じた適当な除湿運転を行うことができる空気調和装置を提供することにある。 The subject of this invention is providing the air conditioning apparatus which can perform suitable dehumidification operation according to humidity load.

本発明の第１観点に係る空気調和装置は、冷房運転および除湿運転時に圧縮機、室外熱交換器、減圧弁、室内熱交換器の順で冷媒が循環する蒸気圧縮式冷凍サイクルを利用する空気調和装置であって、少なくとも減圧弁の開度を制御する制御部を備えている。制御部は、第１除湿運転と第２除湿運転とを実行可能である。第１除湿運転は、室内熱交換器の冷媒出口で冷媒が蒸発をほぼ完了するように減圧弁の開度を制御して空調対象空間の除湿を行う運転である。第２除湿運転は、第１除湿運転よりも減圧弁の開度を絞って空調対象空間の除湿を行う運転である。さらに、制御部は、空調対象空間の潜熱負荷の大きさに基づいて第１除湿運転と第２除湿運転との切換を行う。 An air conditioner according to a first aspect of the present invention uses air using a vapor compression refrigeration cycle in which refrigerant circulates in the order of a compressor, an outdoor heat exchanger, a pressure reducing valve, and an indoor heat exchanger during cooling operation and dehumidifying operation. It is a harmony device, Comprising: At least the control part which controls the opening degree of a pressure-reduction valve is provided. The control unit can execute the first dehumidifying operation and the second dehumidifying operation. The first dehumidifying operation is an operation for dehumidifying the air-conditioning target space by controlling the opening of the pressure reducing valve so that the refrigerant almost completely evaporates at the refrigerant outlet of the indoor heat exchanger. The second dehumidifying operation is an operation for dehumidifying the air-conditioning target space by narrowing the opening of the pressure reducing valve compared to the first dehumidifying operation. Furthermore, the control unit performs switching between the first dehumidifying operation and the second dehumidifying operation based on the size of the latent heat load in the air conditioning target space.

例えば、第１除湿運転だけでは、潜熱負荷が小さいときに能力が顕熱を下げることに費やされ、空調対象空間の冷え過ぎが生じる。他方、第２除湿運転だけでは、顕熱負荷が高いときに除湿量が不足し、空調対象空間を目標湿度まで除湿することができない。 For example, in the first dehumidifying operation alone, when the latent heat load is small, the capacity is consumed for reducing the sensible heat, and the air-conditioning target space is overcooled. On the other hand, with only the second dehumidifying operation, the amount of dehumidification is insufficient when the sensible heat load is high, and the air-conditioning target space cannot be dehumidified to the target humidity.

しかしながら、この空気調和装置では、空調対象空間の潜熱負荷の大きさに基づいて第１除湿運転と第２除湿運転との切換が行われるので、運転効率の良い除湿運転が行われる。 However, in this air conditioner, switching between the first dehumidifying operation and the second dehumidifying operation is performed based on the size of the latent heat load in the air-conditioning target space, so that the dehumidifying operation with high operating efficiency is performed.

本発明の第２観点に係る空気調和装置は、第１観点に係る空気調和装置であって、第２除湿運転では、減圧弁を出た冷媒が室内熱交換器の冷媒出口よりも冷媒入口に近い領域で蒸発を完了するように減圧弁の開度が制御される。 An air conditioner according to a second aspect of the present invention is the air conditioner according to the first aspect, wherein in the second dehumidifying operation, the refrigerant that has exited the pressure reducing valve is located closer to the refrigerant inlet than the refrigerant outlet of the indoor heat exchanger. The opening degree of the pressure reducing valve is controlled so that the evaporation is completed in a close region.

この空気調和装置では、必要な除湿量に応じて室内熱交換器の使用域が切り換えられるので、省エネルギーである。 In this air conditioner, the usage range of the indoor heat exchanger can be switched according to the required dehumidification amount, so that energy is saved.

本発明の第３観点に係る空気調和装置は、第２観点に係る空気調和装置であって、室内熱交換器は、冷媒入口を有する第１熱交換部と、冷媒出口を有する第２熱交換部とを有している。第２除湿運転では、減圧弁を出た冷媒が第１熱交換部の途中で蒸発を完了するように減圧弁の開度が制御される。 An air conditioner according to a third aspect of the present invention is the air conditioner according to the second aspect, wherein the indoor heat exchanger includes a first heat exchange part having a refrigerant inlet and a second heat exchange having a refrigerant outlet. Part. In the second dehumidifying operation, the opening degree of the pressure reducing valve is controlled so that the refrigerant that has exited the pressure reducing valve completes evaporation in the middle of the first heat exchange unit.

この空気調和装置では、第２除湿運転時、冷媒は第１熱交換部で蒸発を完了し、第２熱交換部で過熱蒸気となる。つまり、第１熱交換部を通過する空気は除湿され温度が低下するが、第２熱交換部を通過する空気は室温程度の空気であるので、両者が混合されることによって温度を下げ過ぎることなく除湿が行われる。 In this air conditioner, during the second dehumidifying operation, the refrigerant completes evaporation at the first heat exchange unit and becomes superheated steam at the second heat exchange unit. That is, the air passing through the first heat exchanging section is dehumidified and the temperature is lowered, but the air passing through the second heat exchanging section is air at about room temperature, so that the temperature is lowered too much by mixing the two. Without dehumidification.

本発明の第４観点に係る空気調和装置は、第１観点に係る空気調和装置であって、空調対象空間の湿度を検出する湿度検出手段をさらに備えている。制御部は、空調対象空間の湿度と目標湿度との差が所定範囲から外れているときは第１除湿運転を行い、空調対象空間の湿度と目標湿度との差が所定範囲内にあるときは第２除湿運転を行う。 An air conditioner according to a fourth aspect of the present invention is the air conditioner according to the first aspect, further comprising humidity detecting means for detecting the humidity of the air-conditioning target space. The control unit performs the first dehumidifying operation when the difference between the humidity of the air conditioning target space and the target humidity is out of the predetermined range, and when the difference between the humidity of the air conditioning target space and the target humidity is within the predetermined range. A second dehumidifying operation is performed.

この空気調和装置では、空調対象空間の湿度と目標湿度との差に基づいて第１除湿運転と第２除湿運転との切換が行われるので、運転効率の良い除湿運転が行われる。 In this air conditioner, since switching between the first dehumidifying operation and the second dehumidifying operation is performed based on the difference between the humidity of the air-conditioning target space and the target humidity, the dehumidifying operation with high operating efficiency is performed.

本発明の第１観点に係る空気調和装置では、空調対象空間の潜熱負荷の大きさに基づいて第１除湿運転と第２除湿運転との切換が行われるので、運転効率の良い除湿運転が行われる。 In the air conditioning apparatus according to the first aspect of the present invention, switching between the first dehumidifying operation and the second dehumidifying operation is performed based on the size of the latent heat load in the air-conditioning target space, so that the dehumidifying operation with high operating efficiency is performed. Is called.

本発明の第２観点に係る空気調和装置では、必要な除湿量に応じて室内熱交換器の使用域が切り換えられるので、省エネルギーである。 In the air conditioner according to the second aspect of the present invention, the usage range of the indoor heat exchanger is switched in accordance with the required dehumidification amount, which is energy saving.

本発明の第３観点に係る空気調和装置では、第２除湿運転時、冷媒は第１熱交換部で蒸発を完了し、第２熱交換部で過熱蒸気となる。つまり、第１熱交換部を通過する空気は除湿され温度が低下するが、第２熱交換部を通過する空気は室温程度の空気であるので、両者が混合されることによって温度を下げ過ぎることなく除湿が行われる。 In the air conditioning apparatus according to the third aspect of the present invention, during the second dehumidifying operation, the refrigerant completes evaporation at the first heat exchange unit and becomes superheated steam at the second heat exchange unit. That is, the air passing through the first heat exchanging section is dehumidified and the temperature is lowered, but the air passing through the second heat exchanging section is air at about room temperature, so that the temperature is lowered too much by mixing the two. Without dehumidification.

本発明の第４観点に係る空気調和装置では、空調対象空間の湿度と目標湿度との差に基づいて第１除湿運転と第２除湿運転との切換が行われるので、運転効率の良い除湿運転が行われる。 In the air conditioner according to the fourth aspect of the present invention, the switching between the first dehumidifying operation and the second dehumidifying operation is performed based on the difference between the humidity of the air-conditioning target space and the target humidity. Is done.

本発明の一実施形態に係る空気調和装置の構成図。The block diagram of the air conditioning apparatus which concerns on one Embodiment of this invention. 運転時の空調室内機の断面図。A sectional view of an air-conditioning indoor unit at the time of operation. 図２における空調室内機の断面図。Sectional drawing of the air-conditioning indoor unit in FIG. 冷媒パスを示す室内熱交換器の側面図。The side view of the indoor heat exchanger which shows a refrigerant | coolant path | pass. 除湿運転の制御フローチャート。The control flowchart of a dehumidification driving | operation.

以下、図面を参照しながら、本発明の実施形態について説明する。なお、以下の実施形態は、本発明の具体例であって、本発明の技術的範囲を限定するものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention.

（１）空気調和装置１の構成
図１は、本発明の一実施形態に係る空気調和装置１の構成図である。図１において、空気調和装置１は、空調室外機２と空調室内機１０とを備えている。空気調和装置１は、冷媒が充填された冷媒回路１００を備えている。冷媒回路１００は、空調室外機２に収容された室外側回路部と空調室内機１０に収容された室内側回路部とがガス側連絡配管１１７ａ及び液側連絡配管１１７ｂによって接続されることによって構成されている。 (1) Configuration of Air Conditioner 1 FIG. 1 is a configuration diagram of an air conditioner 1 according to an embodiment of the present invention. In FIG. 1, the air conditioner 1 includes an air conditioning outdoor unit 2 and an air conditioning indoor unit 10. The air conditioner 1 includes a refrigerant circuit 100 filled with a refrigerant. The refrigerant circuit 100 is configured by connecting an outdoor circuit unit housed in the air-conditioning outdoor unit 2 and an indoor circuit unit housed in the air-conditioning indoor unit 10 by a gas side communication pipe 117a and a liquid side communication pipe 117b. Has been.

（２）空調室外機２の構成
空調室外機２における室外側回路部には、圧縮機１０１、四路切換弁１０２、室外熱交換器１０３、及び膨張弁１０４が接続されている。 (2) Configuration of Air Conditioning Outdoor Unit 2 A compressor 101, a four-way switching valve 102, an outdoor heat exchanger 103, and an expansion valve 104 are connected to the outdoor circuit portion in the air conditioning outdoor unit 2.

圧縮機１０１の吐出側は、四路切換弁１０２の第１ポートＰ１に接続されている。圧縮機１０１の吸入側は、アキュムレータ１２０を挟んで四路切換弁１０２の第３ポートＰ３に接続されている。アキュムレータ１２０は、液冷媒とガス冷媒とを分離する。 The discharge side of the compressor 101 is connected to the first port P1 of the four-way switching valve 102. The suction side of the compressor 101 is connected to the third port P3 of the four-way switching valve 102 with the accumulator 120 interposed therebetween. The accumulator 120 separates the liquid refrigerant and the gas refrigerant.

室外熱交換器１０３は、クロスフィン式のフィン・アンド・チューブ型熱交換器である。この室外熱交換器１０３の近傍には、室外空気を室外熱交換器１０３へ送るための室外ファン１２３が設けられている。室外熱交換器１０３の一端側は、四路切換弁１２の第４ポートＰ４に接続されている。室外熱交換器１０３の他端側は、減圧手段である膨張弁１０４に接続されている。膨張弁１０４は、開度可変の電動式膨張弁である。 The outdoor heat exchanger 103 is a cross-fin type fin-and-tube heat exchanger. An outdoor fan 123 for sending outdoor air to the outdoor heat exchanger 103 is provided in the vicinity of the outdoor heat exchanger 103. One end side of the outdoor heat exchanger 103 is connected to the fourth port P4 of the four-way switching valve 12. The other end side of the outdoor heat exchanger 103 is connected to an expansion valve 104 that is a decompression unit. The expansion valve 104 is an electric expansion valve with a variable opening.

四路切換弁１０２は、第１ポートＰ１と第４ポートＰ４が互いに連通して第２ポートＰ２と第３ポートＰ３が互いに連通する第１状態（図１の実線で示す状態）と、第１ポートＰ１と第２ポートＰ２が互いに連通して第３ポートＰ３と第４ポートＰ４が互いに連通する第２状態（図１の点線で示す状態）とが切り換え可能となっている。 The four-way switching valve 102 has a first state (state indicated by a solid line in FIG. 1) in which the first port P1 and the fourth port P4 communicate with each other and the second port P2 and the third port P3 communicate with each other, A second state (state indicated by a dotted line in FIG. 1) in which the port P1 and the second port P2 communicate with each other and the third port P3 and the fourth port P4 communicate with each other can be switched.

（３）空調室内機１０の構成
図１において、室内側回路部には、補助熱交換器１３ａ、主熱交換器１３ｂが接続されている。補助熱交換器１３ａ及び主熱交換器１３ｂは、クロスフィン式のフィン・アンド・チューブ型熱交換器である。この補助熱交換器１３ａ及び主熱交換器１３ｂを総称して室内熱交換器１３と呼ぶ。この室内熱交換器１３の近傍には、室内空気を室内熱交換器１３へ送るための室内ファン１４が設けられている。 (3) Configuration of Air Conditioning Indoor Unit 10 In FIG. 1, an auxiliary heat exchanger 13a and a main heat exchanger 13b are connected to the indoor circuit unit. The auxiliary heat exchanger 13a and the main heat exchanger 13b are cross-fin type fin-and-tube heat exchangers. The auxiliary heat exchanger 13a and the main heat exchanger 13b are collectively referred to as an indoor heat exchanger 13. An indoor fan 14 for sending room air to the indoor heat exchanger 13 is provided in the vicinity of the indoor heat exchanger 13.

（４）空調室内機１０の詳細構成
図２は、運転時の空調室内機１０の斜視図である。また、図３は、図２における空調室内機１０の断面図である。図２及び図３において、空調室内機１０には、本体ケーシング１１、室内熱交換器１３、室内ファン１４、底フレーム１６、及び制御部４０が搭載されている。 (4) Detailed Configuration of Air Conditioning Indoor Unit 10 FIG. 2 is a perspective view of the air conditioning indoor unit 10 during operation. FIG. 3 is a cross-sectional view of the air conditioning indoor unit 10 in FIG. 2 and 3, a main body casing 11, an indoor heat exchanger 13, an indoor fan 14, a bottom frame 16, and a control unit 40 are mounted on the air conditioning indoor unit 10.

（４−１）本体ケーシング１１
本体ケーシング１１は、天面部１１ａ、前面パネル１１ｂ、背面板１１ｃ及び下部水平板１１ｄを有し、内部に室内熱交換器１３、室内ファン１４、底フレーム１６、フィルタ２４、及び制御部４０を収納している。 (4-1) Main body casing 11
The main body casing 11 has a top surface portion 11a, a front panel 11b, a back plate 11c, and a lower horizontal plate 11d, and houses an indoor heat exchanger 13, an indoor fan 14, a bottom frame 16, a filter 24, and a control unit 40 therein. doing.

天面部１１ａは、本体ケーシング１１の上部に位置し、天面部１１ａの前部には、吸込口１２が設けられている。 The top surface part 11a is located in the upper part of the main body casing 11, and the inlet 12 is provided in the front part of the top surface part 11a.

前面パネル１１ｂは空調室内機１０の前面部を構成しており、吸込開口がない湾曲した形状を成している。また、前面パネル１１ｂは、その上端が天面部１１ａに回動自在に支持され、ヒンジ式に動作することができる。 The front panel 11b constitutes the front part of the air conditioning indoor unit 10, and has a curved shape with no suction opening. Further, the upper end of the front panel 11b is rotatably supported by the top surface portion 11a, and can operate in a hinged manner.

（４−２）フィルタ２４
吸込口１２と室内熱交換器１３との間にはフィルタ２４が配置されている。フィルタ２４は、吸込口１２から吸い込まれた空気に含まれる塵埃を除去する。なお、フィルタ２４は、フィルタ自動清掃ユニット２５に組み込まれた状態で本体ケーシング１１に収納されている。 (4-2) Filter 24
A filter 24 is disposed between the suction port 12 and the indoor heat exchanger 13. The filter 24 removes dust contained in the air sucked from the suction port 12. The filter 24 is housed in the main body casing 11 in a state of being incorporated in the filter automatic cleaning unit 25.

（４−３）室内熱交換器１３
室内熱交換器１３は、通過する空気との間で熱交換を行う。また、室内熱交換器１３のうち主熱交換器１３ｂは、側面視において両端が下方に向いて屈曲する逆Ｖ字状の形状を成す。説明の便宜上、前方の主熱交換器１３ｂを前面主熱交換器１３ｂａ、後方の主熱交換器１３ｂを背面主熱交換器１３ｂｂと呼ぶ。補助熱交換器１３ａは、前面主熱交換器１３ｂａの前方に配置されている。 (4-3) Indoor heat exchanger 13
The indoor heat exchanger 13 exchanges heat with the passing air. Moreover, the main heat exchanger 13b among the indoor heat exchangers 13 has an inverted V shape in which both ends are bent downward in a side view. For convenience of explanation, the front main heat exchanger 13b is referred to as a front main heat exchanger 13ba, and the rear main heat exchanger 13b is referred to as a back main heat exchanger 13bb. The auxiliary heat exchanger 13a is disposed in front of the front main heat exchanger 13ba.

図４は、冷媒パスを示す室内熱交換器１３の側面図である。図４において、冷房運転時には、補助熱交換器１３ａの下方の端部近くに配置された冷媒入口１３１から液冷媒が供給され、その供給された液冷媒は、補助熱交換器１３ａの上端に近づくように流れる。そして、補助熱交換器１３ａの上端近くに配置された出口１３２から流れ出て分岐部１３３に入る。 FIG. 4 is a side view of the indoor heat exchanger 13 showing the refrigerant path. In FIG. 4, at the time of cooling operation, liquid refrigerant is supplied from the refrigerant inlet 131 disposed near the lower end of the auxiliary heat exchanger 13a, and the supplied liquid refrigerant approaches the upper end of the auxiliary heat exchanger 13a. It flows like. And it flows out from the exit 132 arrange | positioned near the upper end of the auxiliary heat exchanger 13a, and enters the branch part 133.

分岐部１３３において６つに分岐された冷媒それぞれは、主熱交換器１３ｂの６つの入口１３４から、前面主熱交換器１３ｂａの下方部分と上方部分とに供給される。その後、冷媒は、６つの出口１３５から流れ出て、２つ一組となり３つの合流部１３６のいずれかで合流する。 Each of the refrigerants branched into six in the branch part 133 is supplied from the six inlets 134 of the main heat exchanger 13b to the lower part and the upper part of the front main heat exchanger 13ba. Thereafter, the refrigerant flows out from the six outlets 135 and joins at any one of the three junctions 136 in pairs.

さらに、３つの合流部１３６それぞれから出た冷媒は、背面主熱交換器１３ｂｂの３つの入口１３７から、背面主熱交換器１３ｂｂの中央部分と上方部分とに供給され、その後、３つの冷媒出口１３８から流れ出て合流部１３９で合流する。なお、暖房運転モードでは、冷媒が上記と反対方向に流れる。 Further, the refrigerant that has come out of each of the three junctions 136 is supplied from the three inlets 137 of the back main heat exchanger 13bb to the central part and the upper part of the back main heat exchanger 13bb, and thereafter, the three refrigerant outlets It flows out from 138 and joins at a junction 139. In the heating operation mode, the refrigerant flows in the opposite direction.

（４−４）室内ファン１４
図３において、室内ファン１４は、室内熱交換器１３の下方に位置する。室内ファン１４は、クロスフローファンであり、室内から取り込んだ空気を、室内熱交換器１３に当てて通過させた後、室内に吹き出す。室内ファン１４および室内熱交換器１３は、底フレーム１６に取り付けられている。 (4-4) Indoor fan 14
In FIG. 3, the indoor fan 14 is located below the indoor heat exchanger 13. The indoor fan 14 is a cross-flow fan, blows air taken in from the room against the indoor heat exchanger 13 and then blows it into the room. The indoor fan 14 and the indoor heat exchanger 13 are attached to the bottom frame 16.

（４−５）垂直風向調整板２０
図２に示すように、垂直風向調整板２０は、本体ケーシング１１の吹出口１５より奥側に配置されている。垂直風向調整板２０は、複数の羽根片２０１と、複数の羽根片２０１を連結する連結棒２０３を有している。 (4-5) Vertical wind direction adjusting plate 20
As shown in FIG. 2, the vertical wind direction adjusting plate 20 is disposed on the back side of the air outlet 15 of the main body casing 11. The vertical wind direction adjusting plate 20 includes a plurality of blade pieces 201 and a connecting rod 203 that connects the plurality of blade pieces 201.

複数枚の羽根片２０１は、連結棒２０３が吹出口１５の長手方向に沿って水平往復移動することによって、その長手方向に対して垂直な状態を中心に左右に揺動する。なお、連結棒２０３は、モータ（図示せず）によって水平往復移動する。 The plurality of blade pieces 201 swing left and right around a state perpendicular to the longitudinal direction as the connecting rod 203 horizontally reciprocates along the longitudinal direction of the outlet 15. The connecting rod 203 is horizontally reciprocated by a motor (not shown).

（４−６）風向調整羽根３１
吹出口１５が、本体ケーシング１１の下部に設けられている。吹出口１５には、吹出口１５から吹き出される調和空気の方向を変更する風向調整羽根３１が回動自在に取り付けられている。風向調整羽根３１は、モータ（図示せず）によって駆動し、調和空気の吹き出し方向を変更するだけでなく、吹出口１５を開閉することもできる。風向調整羽根３１は、傾斜角が異なる複数の姿勢をとることが可能である。 (4-6) Wind direction adjusting blade 31
An air outlet 15 is provided in the lower part of the main casing 11. A wind direction adjusting blade 31 that changes the direction of conditioned air blown from the blower outlet 15 is rotatably attached to the blower outlet 15. The wind direction adjusting blade 31 is driven by a motor (not shown) and can change the blowing direction of the conditioned air, and can also open and close the blowout port 15. The wind direction adjusting blade 31 can take a plurality of postures having different inclination angles.

（４−７）コアンダ羽根３２
また、吹出口１５の近傍にはコアンダ羽根３２が設けられている。コアンダ羽根３２は、モータ（図示せず）によって前後方向に傾斜した姿勢をとることが可能であり、運転停止時に前面パネル１１ｂに設けられた収容部１３０に収容される。コアンダ羽根３２は、傾斜角が異なる複数の姿勢をとることが可能である。 (4-7) Coanda blade 32
A Coanda blade 32 is provided in the vicinity of the air outlet 15. The Coanda blade 32 can take a posture inclined in the front-rear direction by a motor (not shown), and is accommodated in the accommodating portion 130 provided in the front panel 11b when the operation is stopped. The Coanda blade 32 can take a plurality of postures having different inclination angles.

本実施形態の空調室内機１０は、調和空気の吹き出し方向を制御する手段として、風向調整羽根３１のみを回動させて調和空気の吹き出し方向を調整する通常吹出モードと、風向調整羽根３１及びコアンダ羽根３２を回動させてコアンダ効果によって調和空気をコアンダ羽根３２の外側面３２ａに沿わせたコアンダ気流にして調整するコアンダ効果利用モードとを有している。 The air-conditioning indoor unit 10 of the present embodiment, as means for controlling the blowing direction of the conditioned air, is a normal blowing mode in which only the wind direction adjusting blade 31 is rotated to adjust the blowing direction of the conditioned air, the wind direction adjusting blade 31 and the Coanda. And a Coanda effect utilization mode for adjusting the conditioned air to a Coanda airflow along the outer surface 32a of the Coanda blade 32 by rotating the blade 32.

なお、コアンダ（効果）とは、気体や液体の流れのそばに壁があると、流れの方向と壁の方向とが異なっていても、壁面に沿った方向に流れようとする現象である（朝倉書店「法則の辞典」）。 The Coanda (effect) is a phenomenon in which if there is a wall near the flow of gas or liquid, even if the direction of the flow and the direction of the wall are different, they will flow in the direction along the wall surface ( Asakura Shoten "Dictionary of the Law").

（４−８）吹出流路１８と吸込流路２２
また、吹出口１５は、吹出流路１８によって本体ケーシング１１の内部と繋がっている。吹出流路１８は、吹出口１５から底フレーム１６のスクロール１７に沿って形成されている。 (4-8) Blowing flow path 18 and suction flow path 22
Further, the air outlet 15 is connected to the inside of the main body casing 11 by the air outlet channel 18. The blowout channel 18 is formed along the scroll 17 of the bottom frame 16 from the blowout port 15.

室内空気は、室内ファン１４の稼動によって吸込口１２、室内熱交換器１３を経て室内ファン１４に吸い込まれ、室内ファン１４から吹出流路１８を経て吹出口１５から吹き出される。 The indoor air is sucked into the indoor fan 14 through the suction port 12 and the indoor heat exchanger 13 by the operation of the indoor fan 14, and blown out from the blower outlet 15 through the blowout passage 18 from the indoor fan 14.

さらに本体ケーシング１１の下面部には、下部吸込口２１が吹出口１５よりも壁側に設けられている。下部吸込口２１は、吸込流路２２によって本体ケーシング１１の内部と繋がっており、吸込流路２２は下部吸込口２１からスクロール１７に沿って形成されている。つまり、吸込流路２２は、スクロール１７を挟んで吹出流路１８と隣接している。 Furthermore, a lower suction port 21 is provided on the lower surface of the main casing 11 on the wall side with respect to the air outlet 15. The lower suction port 21 is connected to the inside of the main body casing 11 by a suction flow path 22, and the suction flow path 22 is formed along the scroll 17 from the lower suction port 21. That is, the suction flow path 22 is adjacent to the blowout flow path 18 with the scroll 17 interposed therebetween.

開閉板２９が開状態のとき、下部吸込口２１近傍の室内空気は、室内ファン１４の稼動によって下部吸込口２１、吸込流路２２、フィルタ２４及び室内熱交換器１３を経て室内ファン１４に吸い込まれ、室内ファン１４から吹出流路１８を経て吹出口１５から吹き出される。 When the opening / closing plate 29 is in the open state, the indoor air near the lower suction port 21 is sucked into the indoor fan 14 through the lower suction port 21, the suction flow path 22, the filter 24 and the indoor heat exchanger 13 by the operation of the indoor fan 14. Then, the air is blown out from the blower outlet 15 through the blowout flow path 18 from the indoor fan 14.

（４−９）制御部４０
制御部４０は、本体ケーシング１１を前面パネル１１ｂから視て室内熱交換器１３及び室内ファン１４の右側方に位置しており、室内ファン１４の回転数制御、風向調整羽根３１及びコアンダ羽根３２の動作制御を行う。 (4-9) Control unit 40
The control unit 40 is located on the right side of the indoor heat exchanger 13 and the indoor fan 14 when the main body casing 11 is viewed from the front panel 11b, and controls the rotational speed of the indoor fan 14, the wind direction adjusting blade 31 and the Coanda blade 32. Perform motion control.

（４−１０）各種センサ
図１に示すように、冷媒回路１００において、蒸発温度センサ１０５が室外熱交換器１０３側から視て膨張弁１０４の下流側配管に取り付けられている。蒸発温度センサ１０５は、蒸発温度を検知する。 (4-10) Various Sensors As shown in FIG. 1, in the refrigerant circuit 100, the evaporation temperature sensor 105 is attached to the downstream pipe of the expansion valve 104 as viewed from the outdoor heat exchanger 103 side. The evaporation temperature sensor 105 detects the evaporation temperature.

また、補助熱交換器１３ａの上端近くの風下側（図４参照）には、室内熱交温度センサ１０６が配置されている。室内熱交温度センサ１０６は、補助熱交換器１３ａにおいて液冷媒の蒸発が終了したことを検知する。 An indoor heat exchanger temperature sensor 106 is disposed on the leeward side (see FIG. 4) near the upper end of the auxiliary heat exchanger 13a. The indoor heat exchanger temperature sensor 106 detects that the liquid refrigerant has been evaporated in the auxiliary heat exchanger 13a.

さらに、本体ケーシング１１側面のスリット１１ｅ（図２参照）の奥側には、室内温度センサ１０７が配置されている。室内温度センサ１０７は、室内温度を検知する。また、室内温度センサ１０７の近傍には、湿度検出手段としての湿度センサ１０８が配置されている。 Furthermore, an indoor temperature sensor 107 is disposed on the back side of the slit 11e (see FIG. 2) on the side surface of the main body casing 11. The room temperature sensor 107 detects the room temperature. Further, a humidity sensor 108 as a humidity detecting means is disposed in the vicinity of the indoor temperature sensor 107.

（５）空気調和装置１の動作
空気調和装置１では、四路切換弁１２によって、冷房運転および暖房運転のいずれか一方に切り換えることが可能である。 (5) Operation of the Air Conditioner 1 In the air conditioner 1, the four-way switching valve 12 can be switched to either the cooling operation or the heating operation.

（５−１）冷房運転
冷房運転では、四路切換弁１０２が第１状態（図１の実線）に設定される。この状態で圧縮機１０１を運転すると、冷媒回路１００では室外熱交換器１０３が凝縮器となり、補助熱交換器１３ａ及び主熱交換器１３ｂが蒸発器となる蒸気圧縮冷凍サイクルが行われる。 (5-1) Cooling Operation In the cooling operation, the four-way switching valve 102 is set to the first state (solid line in FIG. 1). When the compressor 101 is operated in this state, in the refrigerant circuit 100, a vapor compression refrigeration cycle is performed in which the outdoor heat exchanger 103 becomes a condenser and the auxiliary heat exchanger 13a and the main heat exchanger 13b become evaporators.

圧縮機１０１から吐出された高圧の冷媒は、室外熱交換器１０３で室外空気と熱交換して凝縮する。室外熱交換器１０３を通過した冷媒は、膨張弁１０４を通過する際に減圧され、その後に補助熱交換器１３ａ及び主熱交換器１３ｂで室内空気と熱交換して蒸発する。補助熱交換器１３ａ及び主熱交換器１３ｂを通過した冷媒は、圧縮機１０１へ吸入されて圧縮される。 The high-pressure refrigerant discharged from the compressor 101 is condensed by exchanging heat with outdoor air in the outdoor heat exchanger 103. The refrigerant that has passed through the outdoor heat exchanger 103 is depressurized when passing through the expansion valve 104, and then evaporates by exchanging heat with the indoor air in the auxiliary heat exchanger 13a and the main heat exchanger 13b. The refrigerant that has passed through the auxiliary heat exchanger 13a and the main heat exchanger 13b is sucked into the compressor 101 and compressed.

（５−２）暖房運転
暖房運転では、四路切換弁１２が第２状態（図１の点線）に設定される。そして、この状態で圧縮機１０１を運転すると、冷媒回路１００では、室外熱交換器１０３が蒸発器となり、補助熱交換器１３ａ及び主熱交換器１３ｂが凝縮器となる蒸気圧縮冷凍サイクルが行われる。 (5-2) Heating Operation In the heating operation, the four-way switching valve 12 is set to the second state (dotted line in FIG. 1). When the compressor 101 is operated in this state, the refrigerant circuit 100 performs a vapor compression refrigeration cycle in which the outdoor heat exchanger 103 serves as an evaporator and the auxiliary heat exchanger 13a and the main heat exchanger 13b serve as a condenser. .

圧縮機１０１から吐出された高圧の冷媒は、補助熱交換器１３ａ及び主熱交換器１３ｂで室内空気と熱交換して凝縮する。凝縮した冷媒は、膨張弁１０４を通過する際に減圧された後、室外熱交換器１０３で室外空気と熱交換して蒸発する。室外熱交換器１０３を通過した冷媒は、圧縮機１０１へ吸入されて圧縮される。 The high-pressure refrigerant discharged from the compressor 101 is condensed by exchanging heat with room air in the auxiliary heat exchanger 13a and the main heat exchanger 13b. The condensed refrigerant is decompressed when passing through the expansion valve 104, and then evaporates by exchanging heat with outdoor air in the outdoor heat exchanger 103. The refrigerant that has passed through the outdoor heat exchanger 103 is sucked into the compressor 101 and compressed.

（５−３）除湿運転
除湿運転では、冷媒の流れは冷房運転時と同じである。この空気調和装置１では、制御部４０は、第１除湿運転と第２除湿運転とを実行可能である。第１除湿運転は、主熱交換器１３ｂの冷媒出口１３８（図４参照）で冷媒が蒸発をほぼ完了するように膨張弁１０４の開度を制御して空調対象空間の除湿を行う運転である。第２除湿運転は、膨張弁１０４を出た冷媒が補助熱交換器１３ａの途中で蒸発を完了するように膨張弁１０４の開度を制御して空調対象空間の除湿を行う運転である。制御部４０は、空調対象空間の湿度と目標湿度との差が所定範囲から外れているときは第１除湿運転を行い、空調対象空間の湿度と目標湿度との差が所定範囲内にあるときは第２除湿運転を行う。以下、除湿運転の制御について、フローチャートを参照しながら説明する。 (5-3) Dehumidifying Operation In the dehumidifying operation, the refrigerant flow is the same as in the cooling operation. In the air conditioner 1, the control unit 40 can execute the first dehumidifying operation and the second dehumidifying operation. The first dehumidifying operation is an operation for dehumidifying the air-conditioning target space by controlling the opening of the expansion valve 104 so that the refrigerant is almost completely evaporated at the refrigerant outlet 138 (see FIG. 4) of the main heat exchanger 13b. . The second dehumidifying operation is an operation for dehumidifying the air-conditioning target space by controlling the opening of the expansion valve 104 so that the refrigerant that has exited the expansion valve 104 completes evaporation in the middle of the auxiliary heat exchanger 13a. The control unit 40 performs the first dehumidifying operation when the difference between the humidity of the air conditioning target space and the target humidity is out of the predetermined range, and when the difference between the humidity of the air conditioning target space and the target humidity is within the predetermined range. Performs the second dehumidifying operation. Hereinafter, the control of the dehumidifying operation will be described with reference to a flowchart.

図５は、除湿運転の制御フローチャートである。図５において、制御部４０は、ステップＳ１において、リモコン等から除湿運転指令があるか否かを判定し、除湿運転指令がある場合はステップＳ２へ進み、除湿運転指令がない場合は待機して除湿運転指令があるか否かの判定を継続する。 FIG. 5 is a control flowchart of the dehumidifying operation. In FIG. 5, the control unit 40 determines whether or not there is a dehumidifying operation command from the remote controller or the like in step S1, and proceeds to step S2 if there is a dehumidifying operation command, and waits if there is no dehumidifying operation command. Continue to determine whether or not there is a dehumidifying operation command.

制御部４０は、ステップＳ２において、室温とリモコン等で設定される目標温度との差が所定値ｄ（例えば、ｄ＝４ｄｅｇ）未満であるか否かを判定し、その差が所定値ｄ未満のときはステップＳ３へ進み、その差が所定値ｄ以上のときはステップＳ７へ進む。 In step S2, the control unit 40 determines whether the difference between the room temperature and the target temperature set by the remote controller or the like is less than a predetermined value d (for example, d = 4 deg), and the difference is less than the predetermined value d. If the difference is equal to or greater than the predetermined value d, the process proceeds to step S7.

制御部４０は、ステップＳ３において、現在湿度とリモコン等で設定される目標湿度との差が所定値ｈ１（例えば、ｈ１＝２０％）未満であるか否かを判定し、その差が所定値ｈ１未満のときはステップＳ４へ進み、その差が所定値ｈ１以上のときはステップＳ７へ進む。 In step S3, the control unit 40 determines whether or not the difference between the current humidity and the target humidity set by the remote controller or the like is less than a predetermined value h1 (for example, h1 = 20%), and the difference is a predetermined value. When it is less than h1, the process proceeds to step S4, and when the difference is not less than the predetermined value h1, the process proceeds to step S7.

制御部４０は、ステップＳ４において、第２除湿運転を実行する。室温と目標温度との差が所定値ｄ未満で、且つ、現在湿度と目標湿度との差が所定値ｈ１未満であるとき、潜熱負荷が小さくて冷房運転では除湿できない状態にある。このようなとき、制御部４０は、膨張弁１０４の開度を急激に絞って補助熱交換器１３ａの一部だけを蒸発域として利用する。補助熱交換器１３ａの冷媒入口１３１（図４参照）から供給された液冷媒は、補助熱交換器１３ａの途中で全て蒸発するので、補助熱交換器１３ａの冷媒入口１３１近くの一部の範囲だけが蒸発域となり、補助熱交換器１３ａの蒸発域の下流側の範囲と主熱交換器１３ｂとはいずれも過熱域となる。 In step S4, the control unit 40 performs the second dehumidifying operation. When the difference between the room temperature and the target temperature is less than the predetermined value d and the difference between the current humidity and the target humidity is less than the predetermined value h1, the latent heat load is small and the dehumidifying operation cannot be performed. In such a case, the control unit 40 rapidly throttles the opening of the expansion valve 104 and uses only a part of the auxiliary heat exchanger 13a as an evaporation region. All of the liquid refrigerant supplied from the refrigerant inlet 131 (see FIG. 4) of the auxiliary heat exchanger 13a evaporates in the middle of the auxiliary heat exchanger 13a, and therefore a partial range near the refrigerant inlet 131 of the auxiliary heat exchanger 13a. Only the evaporating zone is provided, and both the range downstream of the evaporating zone of the auxiliary heat exchanger 13a and the main heat exchanger 13b are superheated zones.

そして、補助熱交換器１３ａの上端近くの過熱域を流れた冷媒が、補助熱交換器１３ａの下方部分の風下側に配置された前面主熱交換器１３ｂａの下方部分を流れる。したがって、吸込口１２からの吸込空気において、補助熱交換器１３ａの蒸発域で冷却された空気は、前面主熱交換器１３ｂａで加熱された後、吹出口１５から吹き出される。 And the refrigerant | coolant which flowed through the superheat zone near the upper end of the auxiliary heat exchanger 13a flows through the lower part of the front main heat exchanger 13ba arranged on the leeward side of the lower part of the auxiliary heat exchanger 13a. Therefore, in the intake air from the inlet 12, the air cooled in the evaporation region of the auxiliary heat exchanger 13 a is heated from the front main heat exchanger 13 ba and then blown out from the outlet 15.

他方、吸込口１２からの吸込空気において、補助熱交換器１３ａの過熱域と前面主熱交換器１３ｂａを流れた空気と、背面主熱交換器１３ｂｂを流れた空気とは、室内温度と略同一の温度で、吹出口１５から吹き出される。 On the other hand, in the intake air from the intake port 12, the air flowing through the superheated area of the auxiliary heat exchanger 13a and the front main heat exchanger 13ba and the air flowing through the back main heat exchanger 13bb are substantially the same as the room temperature. The air is blown out from the blowout port 15 at the temperature.

つまり、補助熱交換器１３ａを通過する空気は除湿され温度が低下するが、主熱交換器１３ｂを通過する空気は室温程度の空気であるので、両者が混合されることで温度を下げ過ぎることなく除湿が行われる。 That is, the air passing through the auxiliary heat exchanger 13a is dehumidified and its temperature is lowered, but the air passing through the main heat exchanger 13b is air at room temperature, so that the temperature is lowered too much by mixing the two. Without dehumidification.

第２除湿運転時の補助熱交換器１３ａの上端近くの過熱域では、吸込口１２からの吸込空気がほとんど冷却されない。したがって、室内熱交温度センサ１０６で検知される温度が、室内温度センサ１０７で検知される室内温度と略同一である場合には、補助熱交換器１３ａの途中で蒸発が終了して、補助熱交換器１３ａの上端近くの範囲が過熱域であることを検知できる。 In the overheated region near the upper end of the auxiliary heat exchanger 13a during the second dehumidifying operation, the intake air from the intake port 12 is hardly cooled. Therefore, when the temperature detected by the indoor heat exchanger temperature sensor 106 is substantially the same as the indoor temperature detected by the indoor temperature sensor 107, the evaporation ends in the middle of the auxiliary heat exchanger 13a, and the auxiliary heat It can be detected that the range near the upper end of the exchanger 13a is an overheated region.

なお、室内熱交温度センサ１０６は、室内熱交換器１３の中間部の伝熱管に配置されているので、室内熱交換器１３の中間部近くにおいて、冷暖房運転での凝縮温度または蒸発温度を検知できる。 Since the indoor heat exchanger temperature sensor 106 is disposed in the heat transfer tube in the middle part of the indoor heat exchanger 13, it detects the condensation temperature or evaporation temperature in the air conditioning operation near the middle part of the indoor heat exchanger 13. it can.

次に、制御部４０は、ステップＳ５において、現在湿度と目標湿度との差が所定値ｈ２以上であるか否かを判定し、その差が所定値ｈ２以上のときはステップＳ６へ進み、その差が所定値ｈ２未満のときはステップＳ４の第２除湿運転を継続する。 Next, in step S5, the control unit 40 determines whether or not the difference between the current humidity and the target humidity is greater than or equal to a predetermined value h2, and when the difference is greater than or equal to the predetermined value h2, the control unit 40 proceeds to step S6. When the difference is less than the predetermined value h2, the second dehumidifying operation in step S4 is continued.

例えば、現在湿度と目標湿度との差が所定値ｈ２以上となるのは、外気温度が変化により潜熱（湿度）負荷が増大した場合が想定されている。 For example, it is assumed that the difference between the current humidity and the target humidity is equal to or greater than the predetermined value h2 when the latent heat (humidity) load is increased due to a change in the outside air temperature.

制御部４０は、ステップＳ６において、運転停止指令の有無を判断し、運転停止指令がある場合はステップＳ１０に進んで運転を停止し、運転停止指令がない場合はステップＳ７に移行して第１除湿運転を実行する。つまり、ステップＳ５からステップＳ６を経てステップＳ７へ移行する過程は、制御部４０が湿度の増大によって第２除湿運転では対処しきれないと判断したときに、運転停止指令がないことを確認した上で除湿運転を第１除湿運転に切り換えることを意味している。 In step S6, the controller 40 determines whether or not there is an operation stop command. If there is an operation stop command, the control unit 40 proceeds to step S10 to stop the operation. If there is no operation stop command, the control unit 40 proceeds to step S7 and proceeds to step S7. Perform dehumidifying operation. That is, in the process of moving from step S5 to step S6 through step S6, when the control unit 40 determines that the second dehumidifying operation cannot cope with the increase in humidity, it is confirmed that there is no operation stop command. This means that the dehumidifying operation is switched to the first dehumidifying operation.

なお、ステップＳ７における第１除湿運転は、主熱交換器１３ｂの冷媒出口１３８で冷媒が蒸発をほぼ完了するように膨張弁１０４の開度を制御して空調対象空間の除湿を行う運転であり、冷房運転による除湿とほとんど変わらないので説明を省略する。 The first dehumidifying operation in step S7 is an operation for dehumidifying the air-conditioning target space by controlling the opening of the expansion valve 104 so that the refrigerant is almost completely evaporated at the refrigerant outlet 138 of the main heat exchanger 13b. The description is omitted because it is almost the same as the dehumidification by the cooling operation.

制御部４０は、ステップＳ７において第１除湿運転を実行し、ステップＳ８において現在湿度と目標湿度との差が所定値ｈ３未満であるか否かを判定し、その差が所定値ｈ３未満のときはステップＳ９へ進み、その差が所定値ｈ３以上のときはステップＳ７の第１除湿運転を継続する。 The control unit 40 executes the first dehumidifying operation in step S7, determines whether or not the difference between the current humidity and the target humidity is less than the predetermined value h3 in step S8, and when the difference is less than the predetermined value h3. Proceeds to step S9, and when the difference is equal to or greater than the predetermined value h3, the first dehumidifying operation of step S7 is continued.

制御部４０は、ステップＳ９において、運転停止指令の有無を判断し、運転停止指令がある場合はステップＳ１０に進んで運転を停止し、運転停止指令がない場合はステップＳ４に移行して第２除湿運転を実行する。つまり、ステップＳ８からステップＳ９を経てステップＳ４へ移行する過程は、制御部４０がこのまま第１除湿運転を継続すると室温を下げ過ぎてしまう状態にまで湿度が低下したと判断したときに、運転停止指令がないことを確認した上で除湿運転を第２除湿運転に切り換えることを意味している。 In step S9, the controller 40 determines whether or not there is an operation stop command. If there is an operation stop command, the control unit 40 proceeds to step S10 to stop the operation. If there is no operation stop command, the control unit 40 proceeds to step S4 and proceeds to step S4. Perform dehumidifying operation. In other words, the process of moving from step S8 to step S4 through step S4 is performed when the control unit 40 determines that the humidity has decreased to a state where the room temperature is excessively lowered if the first dehumidifying operation is continued. This means that the dehumidifying operation is switched to the second dehumidifying operation after confirming that there is no command.

なお、上記実施形態では、第１除湿運転および第２除湿運転のいずれかが実行されているとき、第１除湿運転と第２除湿運転との切換要否は現在湿度と目標湿度との差に基づいて判断されているが、それだけに限定されるものではなく、室温と目標温度との差が所定範囲内か否か、或いは、室温と目標温度との差が所定範囲から外れた後の経過時間が所定時間を越えたか否かを切換要否判断の条件として追加してもよい。 In the above embodiment, when either the first dehumidifying operation or the second dehumidifying operation is being performed, the necessity of switching between the first dehumidifying operation and the second dehumidifying operation depends on the difference between the current humidity and the target humidity. Although it is determined based on this, it is not limited to this. Elapsed time after the difference between the room temperature and the target temperature is within the predetermined range or after the difference between the room temperature and the target temperature is out of the predetermined range It may be added as a condition for determining whether switching is necessary or not.

（６）特徴
（６−１）
空気調和装置１では、制御部４０は、第１除湿運転と第２除湿運転とを実行可能である。第１除湿運転は、室内熱交換器１３の冷媒出口１３８で冷媒が蒸発をほぼ完了するように膨張弁１０４の開度を制御して空調対象空間の除湿を行う運転である。第２除湿運転は、膨張弁１０４を出た冷媒が室内熱交換器１３の冷媒出口１３８よりも冷媒入口１３１に近い領域で蒸発を完了するように膨張弁１０４の開度を制御して空調対象空間の除湿を行う運転である。制御部４０は、空調対象空間の湿度と目標湿度との差が所定範囲から外れているときは第１除湿運転を行い、空調対象空間の湿度と目標湿度との差が所定範囲内にあるときは第２除湿運転を行う。つまり、この空気調和装置では、空調対象空間の潜熱負荷の大きさに基づいて第１除湿運転と第２除湿運転との切換が行われるので、運転効率の良い除湿運転が行われる。 (6) Features (6-1)
In the air conditioner 1, the control unit 40 can execute the first dehumidifying operation and the second dehumidifying operation. The first dehumidifying operation is an operation for dehumidifying the air-conditioning target space by controlling the opening of the expansion valve 104 so that the refrigerant is almost completely evaporated at the refrigerant outlet 138 of the indoor heat exchanger 13. In the second dehumidifying operation, the opening degree of the expansion valve 104 is controlled so that the refrigerant exiting the expansion valve 104 completes evaporation in a region closer to the refrigerant inlet 131 than the refrigerant outlet 138 of the indoor heat exchanger 13. This is an operation to dehumidify the space. The control unit 40 performs the first dehumidifying operation when the difference between the humidity of the air conditioning target space and the target humidity is out of the predetermined range, and when the difference between the humidity of the air conditioning target space and the target humidity is within the predetermined range. Performs the second dehumidifying operation. That is, in this air conditioner, since the switching between the first dehumidifying operation and the second dehumidifying operation is performed based on the size of the latent heat load in the air-conditioning target space, the dehumidifying operation with high operating efficiency is performed.

（６−２）
室内熱交換器１３は、冷媒入口１３１を有する補助熱交換器１３ａと、冷媒出口１３８を有する主熱交換器１３ｂとを有している。第２除湿運転では、膨張弁１０４を出た冷媒が補助熱交換器１３ａの途中で蒸発を完了するように膨張弁１０４の開度が制御される。その結果、第２除湿運転では、補助熱交換器１３ａで冷媒は蒸発を完了し、主熱交換器１３ｂで過熱蒸気となる。つまり、補助熱交換器１３ａを通過する空気は除湿され温度が低下するが、主熱交換器１３ｂを通過する空気は室温程度の空気であるので、両者が混合されることで温度を下げ過ぎることなく除湿が行われる。 (6-2)
The indoor heat exchanger 13 includes an auxiliary heat exchanger 13a having a refrigerant inlet 131 and a main heat exchanger 13b having a refrigerant outlet 138. In the second dehumidifying operation, the opening degree of the expansion valve 104 is controlled so that the refrigerant exiting the expansion valve 104 completes evaporation in the middle of the auxiliary heat exchanger 13a. As a result, in the second dehumidifying operation, the refrigerant completes evaporation in the auxiliary heat exchanger 13a and becomes superheated steam in the main heat exchanger 13b. That is, the air passing through the auxiliary heat exchanger 13a is dehumidified and its temperature is lowered, but the air passing through the main heat exchanger 13b is air at room temperature, so that the temperature is lowered too much by mixing the two. Without dehumidification.

以上のように、本発明に係る空気調和装置は室内温度の低下を抑制しつつ除湿を行うことができるので、その構成を応用すれば、冷暖房用空気調和装置に限らず単独の乾燥装置にも有用である。 As described above, the air conditioner according to the present invention can perform dehumidification while suppressing a decrease in the room temperature. Therefore, if the configuration is applied, the air conditioner is not limited to an air conditioner for heating and cooling, but also to a single drying device. Useful.

１空気調和装置
１３室内熱交換器
１３ａ補助熱交換器（第１熱交換部）
１３ｂ主熱交換器（第２熱交換部）
４０制御部
１０１圧縮機
１０３室外熱交換器
１０４膨張弁（減圧弁）
１０８湿度センサ（湿度検出手段）
１３１冷媒入口
１３８冷媒出口 1 Air Conditioner 13 Indoor Heat Exchanger 13a Auxiliary Heat Exchanger (First Heat Exchanger)
13b Main heat exchanger (second heat exchange part)
40 Control Unit 101 Compressor 103 Outdoor Heat Exchanger 104 Expansion Valve (Pressure Reduction Valve)
108 Humidity sensor (humidity detection means)
131 Refrigerant inlet 138 Refrigerant outlet

特開平０９−０１４７２７号公報JP 09-014727 A

Claims

Air conditioning using a vapor compression refrigeration cycle in which refrigerant circulates in the order of the compressor (101), outdoor heat exchanger (103), pressure reducing valve (104), and indoor heat exchanger (13) during cooling operation and dehumidifying operation. A device,
A control unit (40) for controlling at least the opening of the pressure reducing valve (104);
The control unit (40)
A first dehumidifying operation for dehumidifying the air-conditioning target space by controlling the opening of the pressure reducing valve (104) so that the refrigerant is almost completely evaporated at the refrigerant outlet (138) of the indoor heat exchanger (13). ,
A second dehumidifying operation for dehumidifying the air-conditioning target space by reducing the opening of the pressure reducing valve (104) rather than the first dehumidifying operation;
Is possible and
Further, the control unit (40) performs switching between the first dehumidifying operation and the second dehumidifying operation based on the size of the latent heat load of the air-conditioning target space.
Air conditioner.

In the second dehumidifying operation, the refrigerant exiting the pressure reducing valve (104) completes evaporation in a region closer to the refrigerant inlet (131) than the refrigerant outlet (138) of the indoor heat exchanger (13). The opening of the pressure reducing valve (104) is controlled,
The air conditioning apparatus according to claim 1.

The indoor heat exchanger (13)
A first heat exchange section (13a) having the refrigerant inlet (131);
A second heat exchange section (13b) having the refrigerant outlet (138);
Have
In the second dehumidifying operation, the opening degree of the pressure reducing valve (104) is controlled so that the refrigerant exiting the pressure reducing valve (104) completes evaporation in the middle of the first heat exchange section (13a). ,
The air conditioning apparatus according to claim 2.

A humidity detecting means (108) for detecting the humidity of the air-conditioning target space;
The control unit (40)
When the difference between the humidity of the air-conditioning target space and the target humidity is out of a predetermined range, the first dehumidifying operation is performed,
When the difference between the humidity of the air-conditioning target space and the target humidity is within the predetermined range, the second dehumidifying operation is performed.
The air conditioning apparatus according to claim 1.