JP6004367B2

JP6004367B2 - Air conditioner for vehicles

Info

Publication number: JP6004367B2
Application number: JP2012011893A
Authority: JP
Inventors: 高橋　康文; 康文高橋
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2012-01-24
Filing date: 2012-01-24
Publication date: 2016-10-05
Anticipated expiration: 2032-01-24
Also published as: JP2013151183A

Description

本発明は、少なくとも暖房運転を実行可能な車両用空調装置に関する。 The present invention relates to a vehicle air conditioner capable of performing at least a heating operation.

従来、例えばガソリンエンジンを備える自動車では、冷房にヒートポンプが用いられる一方、暖房にエンジンの廃熱が利用されていた。近年では、エンジンの廃熱量が少ないハイブリッド車、およびエンジンの廃熱が利用できない電気自動車が普及してきており、これに合わせて冷房だけでなく暖房にもヒートポンプを用いるようにした車両用空調装置が開発されてきている。例えば、特許文献１には、図６（ａ）に示すような車両用空調装置１００が開示されている。 Conventionally, for example, in a car equipped with a gasoline engine, a heat pump is used for cooling, while waste heat of the engine is used for heating. In recent years, hybrid vehicles with a small amount of engine waste heat and electric vehicles that cannot use engine waste heat have become widespread, and in response to this, vehicle air conditioners that use heat pumps for heating as well as cooling have become available. It has been developed. For example, Patent Document 1 discloses a vehicle air conditioner 100 as shown in FIG.

この車両用空調装置１００は、冷媒が一方向のみに流れるヒートポンプ回路１１０を備えている。ヒートポンプ回路１１０は、圧縮機１２１、第１室内熱交換器１３１、第１膨張弁１２２、室外熱交換器１３３、第２膨張弁１２３および第２室内熱交換器１３２を含み、これらの機器は流路によってこの順に接続されている。また、ヒートポンプ回路１１０には、第１膨張弁１２２をバイパスする短絡路と第２膨張弁１２３をバイパスする短絡路とが設けられており、これらの短絡路には第１開閉弁１４１および第２開閉弁１４２がそれぞれ設けられている。 The vehicle air conditioner 100 includes a heat pump circuit 110 in which the refrigerant flows only in one direction. The heat pump circuit 110 includes a compressor 121, a first indoor heat exchanger 131, a first expansion valve 122, an outdoor heat exchanger 133, a second expansion valve 123, and a second indoor heat exchanger 132. They are connected in this order by road. The heat pump circuit 110 is provided with a short-circuit path that bypasses the first expansion valve 122 and a short-circuit path that bypasses the second expansion valve 123. The short-circuit path includes the first on-off valve 141 and the second short-circuit path. An on-off valve 142 is provided.

特許第３４３３２９７号公報Japanese Patent No. 3433297

しかしながら、図６（ａ）に示す車両用空調装置１００では、作動条件によっては暖房運転時に室外熱交換器１３３での外気からの吸熱が不十分となることがあり、その場合には暖房能力が不足する。 However, in the vehicle air conditioner 100 shown in FIG. 6A, the heat absorption from the outside air in the outdoor heat exchanger 133 may be insufficient during the heating operation depending on the operating conditions. Run short.

本発明は、このような事情に鑑み、暖房能力を向上させることができる車両用空調装置を提供することを目的とする。 In view of such circumstances, an object of the present invention is to provide a vehicle air conditioner that can improve heating capacity.

前記課題を解決するために、本発明の車両用空調装置は、少なくとも暖房運転を実行可能な車両用空調装置であって、車室外から外気を導入するための外気導入口および車室内に空気を吹き出すための吹出口を有するダクトと、前記ダクト内に前記外気導入口から前記吹出口に向かう空気の流れを生じさせる送風機と、冷媒を循環させるヒートポンプ回路であって、暖房運転時に前記ダクト内を流れる空気を加熱する第１室内熱交換器、暖房運転時に前記ダクト内を流れる空気を冷却する第２室内熱交換器、および車室外に配置された室外熱交換器、を含むヒートポンプ回路と、を備え、前記ダクトには、前記第２室内熱交換器を通過した空気を車室外に排出するための排気口が設けられている、ことを特徴とする。 In order to solve the above-described problems, a vehicle air conditioner according to the present invention is a vehicle air conditioner capable of performing at least a heating operation, and is configured to introduce air into an outside air inlet for introducing outside air from the outside of the passenger compartment and the passenger compartment. A duct having an air outlet for blowing out, a blower for generating an air flow from the outside air inlet to the air outlet in the duct, and a heat pump circuit for circulating a refrigerant, and the inside of the duct during heating operation. A heat pump circuit comprising: a first indoor heat exchanger that heats flowing air; a second indoor heat exchanger that cools air flowing in the duct during heating operation; and an outdoor heat exchanger disposed outside the vehicle compartment. And the duct is provided with an exhaust port for discharging the air that has passed through the second indoor heat exchanger out of the passenger compartment.

上記の構成によれば、室外熱交換器だけでなく第２室内熱交換でも外気から吸熱し、この熱を暖房に使用することができるため、暖房能力を向上させることができる。 According to the above configuration, not only the outdoor heat exchanger but also the second indoor heat exchange can absorb heat from the outside air and use this heat for heating, so that the heating capacity can be improved.

本発明の第１実施形態に係る車両用空調装置の構成図The block diagram of the vehicle air conditioner which concerns on 1st Embodiment of this invention. ダクト内の別の構成を示す断面図Sectional view showing another configuration in the duct ダクト内のさらに別の構成を示す断面図Sectional drawing which shows another structure in a duct 第１実施形態の変形例の車両用空調装置の構成図The block diagram of the vehicle air conditioner of the modification of 1st Embodiment 本発明の第２実施形態に係る車両用空調装置の構成図The block diagram of the vehicle air conditioner which concerns on 2nd Embodiment of this invention. （ａ）は従来の車両用空調装置の構成図、（ｂ）は同車両用空調装置に用いられるダンパを示す説明図(A) is a block diagram of the conventional vehicle air conditioner, (b) is explanatory drawing which shows the damper used for the vehicle air conditioner

図６（ａ）に示す車両用空調装置１００では、第１室内熱交換器１３１および第２室内熱交換器１３２は、内気または外気を選択的に流すためのダクト１５０内に配置されている。ダクト１５０内には図略の送風機によって第２室内熱交換器１３２側の一端から内気または外気が取り込まれ、その内気または外気が第１室内熱交換器１３１側の他端から車室内に吹き出される。すなわち、第２室内熱交換器１３２は、第１室内熱交換器１３１よりも風上側に位置している。 In the vehicle air conditioner 100 shown in FIG. 6A, the first indoor heat exchanger 131 and the second indoor heat exchanger 132 are disposed in a duct 150 for selectively flowing the inside air or the outside air. Inside air or outside air is taken into the duct 150 from one end on the second indoor heat exchanger 132 side by a blower (not shown), and the inside air or outside air is blown out from the other end on the first indoor heat exchanger 131 side into the vehicle interior. The That is, the second indoor heat exchanger 132 is located on the windward side of the first indoor heat exchanger 131.

また、ダクト１５０内には、図６（ｂ）に示すように、第２室内熱交換器１３２の風上側に第１ダンパ１６１が配設され、第１室内熱交換器１３１の風上側に第２ダンパ１６２が配設されている。 In the duct 150, as shown in FIG. 6B, a first damper 161 is disposed on the windward side of the second indoor heat exchanger 132, and the first damper 161 is disposed on the windward side of the first indoor heat exchanger 131. Two dampers 162 are provided.

このような構成の車両空調装置１００では、冷房運転時は、第１開閉弁１４１が開かれ、第２開閉弁１４２が閉じられる。また、第１ダンパ１６１および第２ダンパ１６２は、図６（ｂ）中に実線で示す位置にセットされる。これにより、圧縮機１２１から吐出された冷媒は、第１室内熱交換器１３１で放熱することなく室外熱交換器１３３に流入し、ここで放熱した後に第２膨張弁１４２で膨張される。膨張された冷媒は、第２室内熱交換器１３２で吸熱した後に圧縮機１２１に吸入される。 In the vehicle air conditioner 100 having such a configuration, during the cooling operation, the first on-off valve 141 is opened and the second on-off valve 142 is closed. Further, the first damper 161 and the second damper 162 are set at positions indicated by solid lines in FIG. As a result, the refrigerant discharged from the compressor 121 flows into the outdoor heat exchanger 133 without radiating heat from the first indoor heat exchanger 131, and after being dissipated here, is expanded by the second expansion valve 142. The expanded refrigerant absorbs heat in the second indoor heat exchanger 132 and is then sucked into the compressor 121.

一方、暖房運転時は、第１開閉弁１４１が閉じられ、第２開閉弁１４２が開かれる。また、第１ダンパ１６１および第２ダンパ１６２は、図６（ｂ）中に二点鎖線で示す位置にセットされる。これにより、圧縮機１２１から吐出された冷媒は、第１室内熱交換器１３１で放熱し、第１膨張弁１２２で膨張される。膨張された冷媒は、室外熱交換器１３３に流入し、ここで吸熱した後に第２室内熱交換器１３２でさらに吸熱することなく圧縮機１２１に吸入される。 On the other hand, during the heating operation, the first on-off valve 141 is closed and the second on-off valve 142 is opened. Also, the first damper 161 and the second damper 162 are set at the positions indicated by the two-dot chain line in FIG. Thereby, the refrigerant discharged from the compressor 121 dissipates heat in the first indoor heat exchanger 131 and is expanded by the first expansion valve 122. The expanded refrigerant flows into the outdoor heat exchanger 133, absorbs heat here, and then is sucked into the compressor 121 without further absorbing heat in the second indoor heat exchanger 132.

しかしながら、図６（ａ）に示す車両用空調装置１００では、暖房運転時に第２室内熱交換１３２で外気から吸熱すること（ましてやこの熱を暖房に使用すること）ができない。 However, in the vehicle air conditioner 100 shown in FIG. 6A, heat cannot be absorbed from the outside air by the second indoor heat exchange 132 during heating operation (and this heat cannot be used for heating).

これに対し、本発明の車両用空調装置は、室外熱交換器だけでなく第２室内熱交換でも外気から吸熱し、この熱を暖房に使用する構成となっている。 On the other hand, the vehicle air conditioner of the present invention is configured to absorb heat from outside air not only in the outdoor heat exchanger but also in the second indoor heat exchange and use this heat for heating.

以下、本発明の実施形態について、図面を参照しながら説明する。ただし、本発明は以下の実施形態によって限定されるものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments.

（第１実施形態）
図１に、本発明の第１実施形態に係る車両用空調装置１Ａを示す。この車両用空調装置１Ａは、暖房運転および冷房運転を実行可能なものであり、図略の車室内に外気を取り込んだり内気を循環したりするためのダクト５と、冷媒を循環させるヒートポンプ回路１０Ａと、制御装置７（図１では図面の簡略化のために信号線の一部のみを作図）とを備えている。なお、図１はダクト５の形状を模式的に表すものであり、ダクト５の実際の形状は、当該ダクト５が設置されるスペースに合わせて膨らんでいたりうねっていたりしていてもよい。 (First embodiment)
FIG. 1 shows a vehicle air conditioner 1A according to a first embodiment of the present invention. The vehicle air conditioner 1A is capable of performing heating operation and cooling operation, and includes a duct 5 for taking outside air into the interior of the vehicle (not shown) and circulating the inside air, and a heat pump circuit 10A for circulating the refrigerant. And a control device 7 (in FIG. 1, only a part of the signal line is drawn in order to simplify the drawing). FIG. 1 schematically shows the shape of the duct 5, and the actual shape of the duct 5 may be swollen or wavy according to the space in which the duct 5 is installed.

ダクト５は、一方の端部に、車室外からダクト５内に外気を導入するための外気導入口５ａと車室内からダクト５内に内気を導入するための内気導入口５ｂとを有しており、他方の端部に、温度調整された空気を車室内に吹き出すための吹出口５ｃを有している。なお、図示は省略するが、外気導入口５ａおよび内気導入口５ｂの近傍には、外気導入口５ａからダクト５内に導入される外気の量と内気導入口５ｂからダクト５内に導入される内気の量の比率を調整する吸気ダンパ（または吸気シャッター）が配置されている。また、吹出口５ｃは、デフロスタ吹出口、フェイス吹出口およびフット吹出口など複数に分岐していてもよい。 The duct 5 has, at one end, an outside air introduction port 5a for introducing outside air into the duct 5 from the outside of the vehicle interior and an inside air introduction port 5b for introducing inside air into the duct 5 from the inside of the vehicle interior. The other end has an air outlet 5c for blowing out the temperature-adjusted air into the passenger compartment. Although illustration is omitted, in the vicinity of the outside air introduction port 5a and the inside air introduction port 5b, the amount of outside air introduced into the duct 5 from the outside air introduction port 5a and the inside air introduction port 5b are introduced into the duct 5. An intake damper (or intake shutter) that adjusts the ratio of the amount of inside air is arranged. Moreover, the blower outlet 5c may be branched into several, such as a defroster blower outlet, a face blower outlet, and a foot blower outlet.

ダクト５内には、当該ダクト５の一方の端部から他方の端部に向かう空気の流れを生じさせる送風機５１が配置されている。送風機５１は、ブロワであってもよいしファンであってもよい。また、送風機５１は、外気導入口５ａおよび内気導入口５ｂの近くではなく、吹出口５ｃの近くに配置することも可能である。 In the duct 5, a blower 51 that generates an air flow from one end of the duct 5 toward the other end is disposed. The blower 51 may be a blower or a fan. Further, the blower 51 can be arranged not near the outside air inlet 5a and the inside air inlet 5b but near the outlet 5c.

ヒートポンプ回路１０Ａは、ループ状の室内熱交換回路２と、３つの線状の流路である室外熱交換路３、第１連絡路４Ａ、第２連絡路４Ｂを含む。ヒートポンプ回路１０Ａに循環する冷媒としては、Ｒ１３４ａ、Ｒ４１０Ａ、ＨＦＯ−１２３４ｙｆ、ＨＦＯ−１２３４ｚｅ、ＣＯ₂などに加え、他のＨＦＣ系、ＨＣ系などが利用できる。 The heat pump circuit 10A includes a loop-shaped indoor heat exchange circuit 2, an outdoor heat exchange path 3, which is three linear flow paths, a first communication path 4A, and a second communication path 4B. The refrigerant circulating in the heat pump circuit 10A, R134a, R410A, HFO- 1234yf, HFO-1234ze, in addition to such CO _2, other HFC system, HC-based and available.

室内熱交換回路２は、圧縮機２１、第１室内熱交換器２２、第１膨張弁２３および第２室内熱交換器２４を含み、これらの機器は冷媒配管によりこの順に接続されている。また、室内熱交換回路２には、第２室内熱交換器２４と圧縮機２１の間にアキュムレータ２５が設けられている。 The indoor heat exchange circuit 2 includes a compressor 21, a first indoor heat exchanger 22, a first expansion valve 23, and a second indoor heat exchanger 24, and these devices are connected in this order by refrigerant piping. In the indoor heat exchange circuit 2, an accumulator 25 is provided between the second indoor heat exchanger 24 and the compressor 21.

圧縮機２１は、図略の電動モータにより駆動され、吸入口から吸入した冷媒を圧縮して吐出口から吐出する。電動モータは、圧縮機２１の内部に配置されていてもよいし、外部に配置されていてもよい。例えば電気自動車では、電動モータが車両走行用のモータであってもよい。 The compressor 21 is driven by an electric motor (not shown), compresses the refrigerant sucked from the suction port, and discharges it from the discharge port. The electric motor may be disposed inside the compressor 21 or may be disposed outside. For example, in an electric vehicle, the electric motor may be a vehicle driving motor.

第１室内熱交換器２２および第２室内熱交換器２４は、ダクト５内に配置されている。そして、第１室内熱交換器２２および第２室内熱交換器２４は、送風機５１により供給される内気および／または外気と冷媒との間で熱交換を行う。本実施形態では、第１室熱交換器２２は暖房運転時および冷房運転時ともに凝縮器として機能し、第２室内熱交換器２４は暖房運転時および冷房運転時ともに蒸発器として機能する。ただし、後述するように冷房運転時に第１膨張弁２３が全閉に制御される場合は、第１室内熱交換器２２は冷房運転時に機能しない。すなわち、第１室内熱交換器２２は少なくとも暖房運転時にダクト５内を流れる空気を加熱し、第２室内熱交換器２５は暖房運転時および冷房運転時にダクト５内を流れる空気を冷却する。 The first indoor heat exchanger 22 and the second indoor heat exchanger 24 are disposed in the duct 5. The first indoor heat exchanger 22 and the second indoor heat exchanger 24 exchange heat between the inside air and / or outside air supplied by the blower 51 and the refrigerant. In the present embodiment, the first room heat exchanger 22 functions as a condenser during heating operation and cooling operation, and the second indoor heat exchanger 24 functions as an evaporator during heating operation and cooling operation. However, when the first expansion valve 23 is controlled to be fully closed during the cooling operation as described later, the first indoor heat exchanger 22 does not function during the cooling operation. That is, the first indoor heat exchanger 22 heats the air flowing in the duct 5 at least during the heating operation, and the second indoor heat exchanger 25 cools the air flowing in the duct 5 during the heating operation and the cooling operation.

本実施形態では、ダクト５内に当該ダクト５の内部を第１風路５Ａと第２風路５Ｂとに仕切る仕切壁５２が配設されており、第１風路５Ａ内に第１室内熱交換器２２が配置され、第２風路５Ｂ内に第２室内熱交換器２４が配置されている。 In the present embodiment, a partition wall 52 that partitions the inside of the duct 5 into a first air passage 5A and a second air passage 5B is disposed in the duct 5, and the first indoor heat is provided in the first air passage 5A. The exchanger 22 is disposed, and the second indoor heat exchanger 24 is disposed in the second air passage 5B.

第１膨張弁２３は、冷媒を膨張させる膨張機構の一例である。なお、膨張機構としては、膨張する冷媒から動力を回収する容積型の膨張機等を採用してもよい。また、膨張弁には開度変化する弁を用いる事が出来、電動膨張弁、開度が２段階以上に変化する弁や、温度式膨張弁などを採用してもよい。 The first expansion valve 23 is an example of an expansion mechanism that expands the refrigerant. As the expansion mechanism, a positive displacement expander that recovers power from the expanding refrigerant may be employed. In addition, a valve whose opening degree can be changed can be used as the expansion valve, and an electric expansion valve, a valve whose opening degree changes in two or more stages, a temperature type expansion valve, or the like may be adopted.

室外熱交換路３は、室外熱交換器３１および第２膨張弁３２を含む。室外熱交換路３の第２膨張弁３２側の一端３ａは、第１膨張機構２３と第２室内熱交換器２４の間で室内熱交換回路２に接続されている。 The outdoor heat exchange path 3 includes an outdoor heat exchanger 31 and a second expansion valve 32. One end 3 a on the second expansion valve 32 side of the outdoor heat exchange path 3 is connected to the indoor heat exchange circuit 2 between the first expansion mechanism 23 and the second indoor heat exchanger 24.

室外熱交換器３１は、車室外（例えば自動車のフロント）に配置され、車両の走行およびファン３３により供給される外気と冷媒との間で熱交換を行う。室外熱交換器３１は、冷房運転時に凝縮器として機能し、暖房運転時に蒸発器として機能する。第２膨張弁３２は、第１膨張弁２３と同様に、冷媒を膨張させる膨張機構の一例である。 The outdoor heat exchanger 31 is disposed outside the passenger compartment (for example, the front of an automobile), and performs heat exchange between the running air of the vehicle and the refrigerant supplied by the fan 33 and the refrigerant. The outdoor heat exchanger 31 functions as a condenser during the cooling operation, and functions as an evaporator during the heating operation. Similar to the first expansion valve 23, the second expansion valve 32 is an example of an expansion mechanism that expands the refrigerant.

第１連絡路４Ａは、圧縮機２１と第１室内熱交換器２２の間で室内熱交換回路２から分岐し、室外熱交換路３の室外熱交換器３１側の他端３ｂにつながっている。第２連絡路４Ｂは、第２室内熱交換器２４とアキュムレータ２５の間で室内熱交換回路２から分岐し、室外熱交換路３の他端３ｂにつながっている。本実施形態では、第１連絡路４Ａおよび第２連絡路４Ｂが室外熱交換路３の他端３ｂとつながる箇所に三方弁４１が設けられている。 The first communication path 4A branches from the indoor heat exchange circuit 2 between the compressor 21 and the first indoor heat exchanger 22, and is connected to the other end 3b on the outdoor heat exchanger 31 side of the outdoor heat exchange path 3. . The second communication path 4B branches from the indoor heat exchange circuit 2 between the second indoor heat exchanger 24 and the accumulator 25 and is connected to the other end 3b of the outdoor heat exchange path 3. In the present embodiment, a three-way valve 41 is provided at a location where the first communication path 4 A and the second communication path 4 B are connected to the other end 3 b of the outdoor heat exchange path 3.

三方弁４１は、本発明の流路選択手段の一例であり、冷房運転時に第１状態（図中の破線矢印で示すように冷媒が流れる状態）に切り換えられ、暖房運転時に第２状態（図中の実線矢印で示すように冷媒が流れる状態）に切り換えられる。三方弁４１は、第１状態では室外熱交換路３の他端３ｂを第１連絡路４Ａを通じて室内熱交換回路２に連通させ、第２状態では室外熱交換路３の他端３ｂを第２連絡路４Ｂを通じて室内熱交換回路２に連通させる。なお、本発明の流路選択手段としては、三方弁４１の代わりに、第１連絡路４Ａおよび第２連絡路４Ｂのそれぞれに設けられた開閉弁を用いることも可能である。 The three-way valve 41 is an example of the flow path selection means of the present invention, and is switched to the first state during cooling operation (a state in which refrigerant flows as shown by broken line arrows in the figure) and in the second state during heating operation (see FIG. As indicated by the solid arrow in the figure). The three-way valve 41 connects the other end 3b of the outdoor heat exchange path 3 to the indoor heat exchange circuit 2 through the first communication path 4A in the first state, and connects the other end 3b of the outdoor heat exchange path 3 to the second state in the second state. The indoor heat exchange circuit 2 is communicated with the communication path 4B. In addition, as a flow-path selection means of this invention, it is also possible to use the on-off valve provided in each of the 1st connection path 4A and the 2nd connection path 4B instead of the three-way valve 41. FIG.

次に、ダクト５およびその内部の構成をより詳しく説明する。 Next, the duct 5 and the internal configuration thereof will be described in more detail.

ダクト５には、第２室内熱交換器２４を通過した空気を車室外に排出するための排気口５３が設けられている。また、ダクト５内には、第２室内熱交換器２４を通過した空気のうちのどれだけの量が排気口５３を通じて車室外に排出されるかを規定する排気ダンパ６１が配設されている。排気ダンパ６１は、排気口５３を閉じる閉じ位置と第２風路５Ｂを遮断する遮断位置との間で揺動する。 The duct 5 is provided with an exhaust port 53 for discharging the air that has passed through the second indoor heat exchanger 24 to the outside of the passenger compartment. In the duct 5, an exhaust damper 61 is provided that defines how much of the air that has passed through the second indoor heat exchanger 24 is discharged to the outside of the passenger compartment through the exhaust port 53. . The exhaust damper 61 swings between a closed position for closing the exhaust port 53 and a blocking position for blocking the second air passage 5B.

さらに、ダクト５内には、第１風路５Ａを吹き抜ける空気の量を調整する調整ダンパ６２が配設されている。調整ダンパ６２は、第１風路５Ａを遮断する遮断位置と第１風路５Ａを全開にする全開位置との間で揺動する。例えば、調整ダンパ６２の揺動軸がダクト５の内壁面に取り付けられている場合には全開位置とは調整ダンパ６２がダクト５の内壁面に沿う姿勢となる位置であり、調整ダンパ６２の揺動軸が仕切壁５２に取り付けられている場合には全開位置とは調整ダンパ６２が仕切壁５２に沿う姿勢となる位置である。 Further, an adjustment damper 62 that adjusts the amount of air that blows through the first air passage 5 A is disposed in the duct 5. The adjustment damper 62 swings between a blocking position where the first air path 5A is blocked and a fully open position where the first air path 5A is fully opened. For example, when the swing shaft of the adjustment damper 62 is attached to the inner wall surface of the duct 5, the fully open position is a position where the adjustment damper 62 is positioned along the inner wall surface of the duct 5. When the moving shaft is attached to the partition wall 52, the fully open position is a position where the adjustment damper 62 assumes a posture along the partition wall 52.

本実施形態では、調整ダンパ６２が第１室内熱交換器２２の風上側に配置されている。ただし、調整ダンパ６２は、図２に示すように第１室内熱交換器２２の風下側に配置されていてもよい。 In the present embodiment, the adjustment damper 62 is disposed on the windward side of the first indoor heat exchanger 22. However, the adjustment damper 62 may be disposed on the leeward side of the first indoor heat exchanger 22 as shown in FIG.

上述した圧縮機２１および各種の弁２３，３２，４１、ならびに排気ダンパ６１および調整ダンパ６２は、制御装置７により制御される。制御装置７は、車室内に配置された操作パネル（図示せず）と接続されており、暖房運転および冷房運転を行う。以下、各運転時の車両用空調装置１Ａの動作を説明する。 The compressor 21 and the various valves 23, 32 and 41, the exhaust damper 61 and the adjustment damper 62 described above are controlled by the control device 7. The control device 7 is connected to an operation panel (not shown) disposed in the passenger compartment, and performs a heating operation and a cooling operation. Hereinafter, the operation of the vehicle air conditioner 1A during each operation will be described.

＜暖房運転＞
暖房運転時、制御装置７は三方弁４１を第２状態に切り換える。これにより、第１連絡路４Ａを通じた冷媒の流通が禁止され、第２連絡路４Ｂを通じた冷媒の流通が許可される。 <Heating operation>
During the heating operation, the control device 7 switches the three-way valve 41 to the second state. Thereby, the distribution of the refrigerant through the first communication path 4A is prohibited, and the distribution of the refrigerant through the second communication path 4B is permitted.

圧縮機２１から吐出された冷媒は、図１中に実線矢印で示すように、第１室内熱交換器２２および第１膨張弁２３を通過した後に２つの支流に分かれる。それらの支流は、第２膨張弁３２および室外熱交換器３１と第２室内熱交換器２４を別々に通過した後に合流し、再度圧縮機２１に吸入される。 The refrigerant discharged from the compressor 21 is divided into two tributaries after passing through the first indoor heat exchanger 22 and the first expansion valve 23, as indicated by solid arrows in FIG. These tributaries merge after passing through the second expansion valve 32 and the outdoor heat exchanger 31 and the second indoor heat exchanger 24 separately, and are sucked into the compressor 21 again.

例えば、暖房運転時にダクト５内に流れる空気は外気１００％である。この場合、ダクト５内には外気導入口５ａのみから外気が導入される。調整ダンパ６２は全開位置にセットされる。これにより、ダクト５内に導入された外気は、第１風路５Ａと第２風路５Ｂとに別々に流れ込む。 For example, the air flowing into the duct 5 during the heating operation is 100% outside air. In this case, outside air is introduced into the duct 5 only from the outside air inlet 5a. The adjustment damper 62 is set at the fully open position. Thereby, the outside air introduced into the duct 5 flows separately into the first air passage 5A and the second air passage 5B.

第１風路５Ａに流れ込んだ外気は、第１室内熱交換器２２により加熱された後に吹出口５ｃから車室内に吹き出される。これにより、車室内の暖房が行われる。一方、第２風路５Ｂでは、排気ダンパ６１が遮断位置にセットされる。このため、第２風路５Ｂに流れ込んだ外気は、第２室内熱交換器２４により冷却された後に排気口５３から車室外に排出される。すなわち、第２室内熱交換器２４は、もう１つの室外熱交換器として働くため、暖房能力を向上させることができる。 The outside air that has flowed into the first air passage 5A is heated by the first indoor heat exchanger 22 and then blown out from the air outlet 5c into the vehicle interior. Thereby, the vehicle interior is heated. On the other hand, in the second air passage 5B, the exhaust damper 61 is set at the blocking position. For this reason, the outside air that has flowed into the second air passage 5B is cooled by the second indoor heat exchanger 24 and then discharged from the exhaust port 53 to the outside of the passenger compartment. That is, since the second indoor heat exchanger 24 works as another outdoor heat exchanger, the heating capacity can be improved.

なお、第１膨張弁２３は、圧縮機２１に吸入される冷媒が所定の過熱状態となるように調整される。一方、第２膨張弁３２は、第２室内熱交換器２４に流れる冷媒量と室外熱交換器３１に流れる冷媒量の比率が適切になるように調整される。例えば、一般に室外熱交換器３１は第２室内熱交換器２４に比べて大きなサイズを有するため、そのサイズの違いに応じて冷媒の分配率を決定してもよい。 The first expansion valve 23 is adjusted so that the refrigerant sucked into the compressor 21 is in a predetermined overheated state. On the other hand, the second expansion valve 32 is adjusted so that the ratio of the refrigerant amount flowing to the second indoor heat exchanger 24 and the refrigerant amount flowing to the outdoor heat exchanger 31 is appropriate. For example, since the outdoor heat exchanger 31 generally has a larger size than the second indoor heat exchanger 24, the distribution ratio of the refrigerant may be determined according to the difference in size.

ところで、暖房運転時にダクト５内に流れる空気は必ずしも外気１００％である必要はなく、内気と外気の混合気であってもよい。この場合、排気ダンパ６１を閉じ位置と遮断位置の間の中間位置にセットすれば、外気だけでなく内気も第２室内熱交換器２４で冷却され、冷却された内気が車室内に吹き出されるため、ダクト５を通じて循環する内気を第２室内熱交換器２４で除湿することができる。例えば、排気ダンパ６１がセットされるべき中間位置は、吹出口５ｃから車室内に吹き出される空気の温度に応じて変更される。 By the way, the air flowing into the duct 5 during the heating operation is not necessarily 100% of the outside air, and may be a mixture of the inside air and the outside air. In this case, if the exhaust damper 61 is set at an intermediate position between the closed position and the shut-off position, not only the outside air but also the inside air is cooled by the second indoor heat exchanger 24, and the cooled inside air is blown out into the vehicle interior. Therefore, the inside air circulating through the duct 5 can be dehumidified by the second indoor heat exchanger 24. For example, the intermediate position where the exhaust damper 61 is to be set is changed according to the temperature of the air blown out from the outlet 5c into the vehicle compartment.

なお、暖房運転中に室外熱交換器３１に霜が付着した場合には、排気ダンパ６１を遮断位置にセットしたままで三方弁４１を第２状態から第１状態に切り換えれば、室外熱交換器３１の除霜を行いながら車室内の暖房を行うことができる。 In addition, when frost adheres to the outdoor heat exchanger 31 during the heating operation, the outdoor heat exchange can be performed by switching the three-way valve 41 from the second state to the first state while the exhaust damper 61 is set at the shut-off position. The vehicle interior can be heated while defrosting the vessel 31.

＜冷房運転＞
冷房運転時、制御装置７は三方弁４１を第１状態に切り換える。これにより、第１連絡路４Ａを通じた冷媒の流通が許可され、第２連絡路４Ｂを通じた冷媒の流通が禁止される。 <Cooling operation>
During the cooling operation, the control device 7 switches the three-way valve 41 to the first state. Thereby, the circulation of the refrigerant through the first communication path 4A is permitted, and the circulation of the refrigerant through the second communication path 4B is prohibited.

制御装置７は、除湿を重視しない場合、第１膨張弁２３を全閉または低開度に制御する。これにより、圧縮機２１から吐出された冷媒の全量または殆どは、室外熱交換器３１、第２膨張弁３２および第２室内熱交換器２４をこの順に直列に通過し、再度圧縮機２１に吸入される。第２膨張弁３２は、圧縮機２１に吸入される冷媒が所定の過熱状態となるように調整される。 When the dehumidification is not important, the control device 7 controls the first expansion valve 23 to be fully closed or a low opening degree. As a result, all or most of the refrigerant discharged from the compressor 21 passes through the outdoor heat exchanger 31, the second expansion valve 32, and the second indoor heat exchanger 24 in series in this order, and is sucked into the compressor 21 again. Is done. The second expansion valve 32 is adjusted so that the refrigerant sucked into the compressor 21 is in a predetermined overheated state.

例えば、冷房運転時にダクト５内に流れる空気は内気１００％である。この場合、ダクト５内には内気導入口５ｂのみから内気が導入される。調整ダンパ６２は遮断位置にセットされる。これにより、ダクト５内に導入された内気は、第２風路５Ｂのみに流れ込む。 For example, the air flowing into the duct 5 during the cooling operation is 100% inside air. In this case, the inside air is introduced into the duct 5 only from the inside air introduction port 5b. The adjustment damper 62 is set at the blocking position. Thereby, the inside air introduced into the duct 5 flows only into the second air passage 5B.

第２風路５Ｂでは、排気ダンパ６１が閉じ位置にセットされる。このため、第２風路５Ｂに流れ込んだ内気は、第２室内熱交換器２４により冷却された後に吹出口５ｃから車室内に吹き出される。これにより、車室内の冷房が行われる。 In the second air passage 5B, the exhaust damper 61 is set at the closed position. For this reason, the inside air that has flowed into the second air passage 5B is cooled by the second indoor heat exchanger 24 and then blown out from the outlet 5c into the vehicle interior. Thereby, the passenger compartment is cooled.

除湿を重視する場合、制御装置７は、第１膨張弁２３および第２膨張弁３２の双方によって冷媒を膨張させる。すなわち、圧縮機２１から吐出された冷媒は、図中に破線矢印で示すように、まず２つの支流に分かれる。一方の支流は、室外熱交換器３１および第２膨張弁３２を通過し、他方の支流は、第１室内熱交換器２２および第１膨張弁２３を通過する。その後、それらの支流が合流する。合流後の冷媒は、第２室内熱交換器２４を通過した後に再度圧縮機２１に吸入される。第２膨張弁３２は、圧縮機２１に吸入される冷媒が所定の過熱状態となるように調整される。一方、第１膨張弁２３は、第１室内熱交換器２２から流出する冷媒が所定の過冷却状態となるように調整される。 When emphasizing dehumidification, the control device 7 expands the refrigerant by both the first expansion valve 23 and the second expansion valve 32. That is, the refrigerant discharged from the compressor 21 is first divided into two tributaries as indicated by broken line arrows in the figure. One tributary passes through the outdoor heat exchanger 31 and the second expansion valve 32, and the other tributary passes through the first indoor heat exchanger 22 and the first expansion valve 23. After that, those tributaries merge. The combined refrigerant passes through the second indoor heat exchanger 24 and is again sucked into the compressor 21. The second expansion valve 32 is adjusted so that the refrigerant sucked into the compressor 21 is in a predetermined overheated state. On the other hand, the first expansion valve 23 is adjusted so that the refrigerant flowing out of the first indoor heat exchanger 22 is in a predetermined supercooled state.

ダクト５内では、排気ダンパ６１が閉じ位置にセットされ、調整ダンパ６２が遮断位置と全開位置の間の中間位置にセットされる。これにより、第２室内熱交換器２４で過度に冷却された内気が第１室内熱交換器２２で加熱された内気と混合して温められる。例えば、調整ダンパ６２がセットされるべき中間位置は、吹出口５ｃから車室内に吹き出される空気の温度に応じて変更される。 In the duct 5, the exhaust damper 61 is set at the closed position, and the adjustment damper 62 is set at an intermediate position between the cutoff position and the fully open position. Thereby, the inside air excessively cooled by the second indoor heat exchanger 24 is mixed and warmed with the inside air heated by the first indoor heat exchanger 22. For example, the intermediate position where the adjustment damper 62 should be set is changed according to the temperature of the air blown out from the blowout port 5c into the vehicle interior.

なお、冷房運転時にダクト５内に流れる空気は必ずしも内気１００％である必要はなく、内気と外気の混合気であってもよい。 Note that the air flowing in the duct 5 during the cooling operation is not necessarily 100% of the inside air, and may be a mixture of the inside air and the outside air.

＜変形例＞
前記実施形態の車両用空調装置１Ａは種々の変形が可能である。 <Modification>
The vehicle air conditioner 1A of the embodiment can be variously modified.

例えば、図３に示すように、ダクト５内に配設された仕切壁５２は、第２室内熱交換器２４に隣接する風上部５２Ａと第１室内熱交換器２２に隣接する風下部５２Ｂに分割され、それらの間に連通口５４が形成されていてもよい。この場合、ダクト５内には、連通口５４を閉じたり、連通口５４を開いて第２室内熱交換器２４を通過した空気を第１風路５Ａに流入させたりするように揺動するバイパスバンパ６３が配設される。このような構成であれば、暖房運転時および冷房運転時に第２室内熱交換器２４で除湿した空気を第１室内熱交換器２２で加熱することができる。 For example, as shown in FIG. 3, the partition wall 52 disposed in the duct 5 is provided between an upwind portion 52 A adjacent to the second indoor heat exchanger 24 and an upwind portion 52 B adjacent to the first indoor heat exchanger 22. It divides | segments and the communication port 54 may be formed among them. In this case, a bypass that swings in the duct 5 so as to close the communication port 54 or open the communication port 54 so that the air that has passed through the second indoor heat exchanger 24 flows into the first air passage 5A. A bumper 63 is provided. With such a configuration, the air dehumidified by the second indoor heat exchanger 24 can be heated by the first indoor heat exchanger 22 during the heating operation and the cooling operation.

また、図４に示すように、室内熱交換回路２には、第２室内熱交換器２４と第２連絡路４Ｂが分岐する位置との間に減圧弁２６が設けられていてもよい。この減圧弁２６は、第２室内熱交換器２４から流出した冷媒を所定の圧力まで減圧する減圧状態と、そのまま通過させる非減圧状態とに切り換え可能なものである。 Moreover, as shown in FIG. 4, the indoor heat exchange circuit 2 may be provided with a pressure reducing valve 26 between the second indoor heat exchanger 24 and the position where the second communication path 4B branches. The pressure reducing valve 26 can be switched between a reduced pressure state in which the refrigerant flowing out from the second indoor heat exchanger 24 is reduced to a predetermined pressure and a non-depressurized state in which the refrigerant is allowed to pass through.

前記実施形態で説明したとおり、第２室内熱交換器２４は暖房運転時にもう１つの室外熱交換器として働く。図４に示す構成では、第２室内熱交換器２４の下流側に減圧弁２６が配置されているため、この減圧弁２６を減圧状態に切り換えれば、第２室内熱交換器２４の冷媒の温度を室外熱交換器３１の冷媒の温度よりも高くすることができる。これにより、第２室内熱交換器２４に付着した氷を溶かしたり、第２室内熱交換器２４への氷の付着を未然に防いだりすることができる。なお、減圧弁２６は、冷房運転時に非減圧状態に切り換えられる。 As described in the above embodiment, the second indoor heat exchanger 24 functions as another outdoor heat exchanger during heating operation. In the configuration shown in FIG. 4, the pressure reducing valve 26 is disposed on the downstream side of the second indoor heat exchanger 24. Therefore, if the pressure reducing valve 26 is switched to the reduced pressure state, the refrigerant of the second indoor heat exchanger 24 is changed. The temperature can be made higher than the temperature of the refrigerant in the outdoor heat exchanger 31. Thereby, ice adhering to the 2nd indoor heat exchanger 24 can be melted, and adhesion of ice to the 2nd indoor heat exchanger 24 can be prevented beforehand. The pressure reducing valve 26 is switched to a non-depressurized state during the cooling operation.

なお、減圧弁２６の代わりに、オリフィスやキャピラリーチューブなどの固定絞りとこれをバイパスする開閉弁付のバイパス路とで構成される減圧機構を採用してもよい。 Instead of the pressure reducing valve 26, a pressure reducing mechanism including a fixed throttle such as an orifice or a capillary tube and a bypass passage with an on-off valve that bypasses the fixed throttle may be employed.

（第２実施形態）
図５に、本発明の第２実施形態に係る車両用空調装置１Ｂを示す。なお、本実施形態では、第１実施形態と同一構成部分には同一符号を付し、その説明を省略することがある。 (Second Embodiment)
FIG. 5 shows a vehicle air conditioner 1B according to a second embodiment of the present invention. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof may be omitted.

本実施形態の車両用空調装置１Ｂは、冷媒の流れる方向が一定のヒートポンプ回路１０Ｂを備えている。このヒートポンプ回路１０Ｂは、圧縮機２１、第１室内熱交換器２２、第１膨張弁８１、室外熱交換器３１、第２膨張弁８２および第２室内熱交換器２４を含み、これらの機器は冷媒配管によりこの順に接続されている。また、ヒートポンプ回路１０Ｂには、第２室内熱交換器２４と圧縮機２１の間にアキュムレータ２５が設けられている。 The vehicle air conditioner 1 B of the present embodiment includes a heat pump circuit 10 B in which the refrigerant flow direction is constant. The heat pump circuit 10B includes a compressor 21, a first indoor heat exchanger 22, a first expansion valve 81, an outdoor heat exchanger 31, a second expansion valve 82, and a second indoor heat exchanger 24. The refrigerant pipes are connected in this order. In the heat pump circuit 10B, an accumulator 25 is provided between the second indoor heat exchanger 24 and the compressor 21.

暖房運転時、第２膨張弁８２が全開に制御され、第１膨張弁８１が所定の開度に制御される。このため、第１室内熱交換器２２が凝縮器として機能し、室外熱交換器３１および第２室内熱交換器２４が蒸発器として機能する。一方、冷房運転時、第１膨張弁８１が全開に制御され、第２膨張弁８２が所定の開度に制御される。このため、第１室内熱交換器２２および室外熱交換器３１が凝縮器として機能し、第２室内熱交換器２４が蒸発器として機能する。なお、ダクト５およびその内部の構成については第１実施形態と同様である。 During the heating operation, the second expansion valve 82 is controlled to be fully opened, and the first expansion valve 81 is controlled to a predetermined opening. For this reason, the 1st indoor heat exchanger 22 functions as a condenser, and the outdoor heat exchanger 31 and the 2nd indoor heat exchanger 24 function as an evaporator. On the other hand, during the cooling operation, the first expansion valve 81 is controlled to be fully opened, and the second expansion valve 82 is controlled to a predetermined opening. For this reason, the 1st indoor heat exchanger 22 and the outdoor heat exchanger 31 function as a condenser, and the 2nd indoor heat exchanger 24 functions as an evaporator. The duct 5 and the internal configuration thereof are the same as in the first embodiment.

図５に示すヒートポンプ回路１０Ｂでも、第１実施形態と同様の効果を得ることができる。すなわち、本発明におけるヒートポンプ回路は特に限定されるものではない。例えば冷房運転時に第１室内熱交換器２２が蒸発器として機能するように構成されたヒートポンプ回路を採用することも可能である。 Also in the heat pump circuit 10B shown in FIG. 5, the same effect as the first embodiment can be obtained. That is, the heat pump circuit in the present invention is not particularly limited. For example, it is possible to employ a heat pump circuit configured such that the first indoor heat exchanger 22 functions as an evaporator during cooling operation.

なお、暖房運転中に室外熱交換器３１に霜が付着した場合には、排気ダンパ６１を遮断位置にセットしたままで第１膨張弁８１と第２膨張弁８２の操作を逆にすれば、室外熱交換器３１の除霜を行いながら車室内の暖房を行うことができる。 In addition, when frost adheres to the outdoor heat exchanger 31 during the heating operation, if the operations of the first expansion valve 81 and the second expansion valve 82 are reversed while the exhaust damper 61 is set at the cutoff position, The vehicle interior can be heated while defrosting the outdoor heat exchanger 31.

（その他の実施形態）
前記実施形態の車両用空調装置１Ａ，１Ｂは暖房運転および冷房運転の双方が実行可能なものであったが、本発明の車両用空調装置は暖房運転のみを実行可能なものであってもよい。例えば、本発明の車両用空調装置は、図５に示す車両用空調装置１Ｂから第２膨張弁８２および内気導入口５ｂを省略したものであってもよい。 (Other embodiments)
Although the vehicle air conditioners 1A and 1B of the above embodiment are capable of performing both the heating operation and the cooling operation, the vehicle air conditioner of the present invention may be capable of performing only the heating operation. . For example, the vehicle air conditioner of the present invention may be one in which the second expansion valve 82 and the inside air inlet 5b are omitted from the vehicle air conditioner 1B shown in FIG.

また、ダクト５内には必ずしも仕切壁５２が配設されている必要はない。 Further, the partition wall 52 is not necessarily provided in the duct 5.

１Ａ，１Ｂ車両用空調装置
１０Ａ，１０Ｂヒートポンプ回路
２１圧縮機
２２第１室内熱交換器
２３第１膨張弁（第１膨張機構）
２４第２室内熱交換器
３室外熱交換路
３ａ一端
３ｂ他端
３１室外熱交換器
３２第２膨張弁（第２膨張機構）
４Ａ第１連絡路
４Ｂ第２連絡路
４１三方弁（流路変更手段）
５ダクト
５ａ外気導入口
５ｂ内気導入口
５ｃ吹出口
５Ａ第１風路
５Ｂ第２風路
５１送風機
５２仕切壁
５２Ａ風上部
５２Ｂ風下部
５３排気口
５４連通口
６１排気ダンパ
６２調整ダンパ
６３バイパスダンパ 1A, 1B Air conditioner for vehicle 10A, 10B Heat pump circuit 21 Compressor 22 First indoor heat exchanger 23 First expansion valve (first expansion mechanism)
24 second indoor heat exchanger 3 outdoor heat exchange path 3a one end 3b other end 31 outdoor heat exchanger 32 second expansion valve (second expansion mechanism)
4A 1st communication path 4B 2nd communication path 41 Three-way valve (flow path change means)
DESCRIPTION OF SYMBOLS 5 Duct 5a Outside air introduction port 5b Inside air introduction port 5c Outlet 5A 1st air path 5B 2nd air path 51 Blower 52 Partition wall 52A Upwind 52B Downwind 53 Exhaust port 54 Communication port 61 Exhaust damper 62 Adjustment damper 63 Bypass damper

Claims

A vehicle air conditioner capable of performing heating operation,
Outside air introduction port for introducing outside air from outside the vehicle interior, inside air introduction port for introducing inside air from the vehicle interior, an intake mechanism for adjusting the ratio of the amount of outside air and the amount of inside air, and air is blown into the vehicle interior A duct having an outlet for,
A partition wall disposed in the duct and partitioning the inside of the duct into a first air path and a second air path;
A blower for generating a flow of mixed air of the inside air and the outside air from the intake mechanism toward the outlet in the duct;
A heat pump circuit that circulates refrigerant, a first indoor heat exchanger that heats air flowing through the duct during heating operation, a second indoor heat exchanger that cools air flowing through the duct during heating operation, and heating A heat pump circuit including an outdoor heat exchanger disposed outside the passenger compartment that functions as an evaporator during operation, and
The first indoor heat exchanger is disposed in the first air passage, the second indoor heat exchanger is disposed in the second air passage,
The duct is provided with an exhaust port for discharging the air that has passed through the second indoor heat exchanger out of the passenger compartment.
Further includes an exhaust damper to determine the amount of how much of the air that has passed through the second indoor heat exchanger is discharged outside the vehicle compartment through the exhaust port,
The heat pump circuit is
An indoor heat exchange circuit in which the compressor, the first indoor heat exchanger, the first expansion mechanism, and the second indoor heat exchanger are connected in this order;
An outdoor heat exchange path including the outdoor heat exchanger and a second expansion mechanism, one end on the second expansion mechanism side being connected to the indoor heat exchange circuit between the first expansion mechanism and the second indoor evaporator When,
A first communication path branched from the indoor heat exchange circuit between the compressor and the first indoor heat exchanger and connected to the other end of the outdoor heat exchange path on the outdoor heat exchanger side;
A second communication path branched from the indoor heat exchange circuit between the second indoor heat exchanger and the compressor and connected to the other end of the outdoor heat exchange path,
During the cooling operation, the other end of the outdoor heat exchange path is switched to the first state to communicate with the indoor heat exchange circuit through the first communication path, and the other end of the outdoor heat exchange path is connected to the second communication path during the heating operation. A vehicle air conditioner further comprising a flow path selection unit that is switched to a second state that communicates with the indoor heat exchange circuit through the second state .

Disposed within the duct further comprises a control damper for adjusting the amount of air blowing through the first air passage, air-conditioning system according to claim 1.

3. The vehicle air conditioner according to claim 2 , wherein the adjustment damper swings between a blocking position for blocking the first air path and a fully open position for fully opening the first air path.

The said adjustment damper is a vehicle air conditioner of Claim 2 or 3 arrange | positioned at the leeward side of the said 1st indoor heat exchanger.

The said adjustment damper is a vehicle air conditioner of Claim 2 or 3 arrange | positioned in the windward side of the said 1st indoor heat exchanger.

The partition wall is divided into an leeward area adjacent to the second indoor heat exchanger and an leeward area adjacent to the first indoor heat exchanger, and a communication port is formed between them.
6. The apparatus according to claim 5 , further comprising a bypass damper that swings so as to close the communication port or open the communication port and allow air that has passed through the second indoor heat exchanger to flow into the first air passage. The vehicle air conditioner described.

The vehicle air conditioner can also perform a cooling operation,
The vehicle air conditioner according to any one of claims 1 to 6 , wherein the exhaust damper is set at the closed position during cooling operation.