JP2017172868A

JP2017172868A - Air conditioner

Info

Publication number: JP2017172868A
Application number: JP2016059094A
Authority: JP
Inventors: 航世栗田; Kosei Kurita
Original assignee: Fujitsu General Ltd
Current assignee: Fujitsu General Ltd
Priority date: 2016-03-23
Filing date: 2016-03-23
Publication date: 2017-09-28

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner which has a plurality of pieces of indoor heat exchangers and blower fans in an indoor unit, and which can change a temperature difference of air-conditioning air blown out from each air passage.SOLUTION: In order to make the temperatures of air blown out from each of blowout ports different, openings of a first indoor expansion valve and second indoor expansion valve are adjusted respectively. During a cooling operation, the opening of the second indoor expansion valve is made to be smaller than the opening of the first indoor expansion valve and a second blowout temperature is made to be higher than a first blowout temperature, so that it is prevented that cool air blown out from a first blowout port 3f falls downward in a room by warm air blown out from a second blowout port 3g. During a heating operation, the opening of the first indoor expansion valve is made to be smaller than the opening of the second indoor expansion valve and the first blowout temperature is made to be lower than the second blowout temperature, so that it is prevented that warm air blown out from the second blowout port 3g goes upward in the room by the cold air blown out from the first blowout port 3f.SELECTED DRAWING: Figure 2

Description

本発明は、空気調和機に関わり、より詳細には、複数個の熱交換器と送風ファンを備えた室内機を有する空気調和機に関する。 The present invention relates to an air conditioner, and more particularly, to an air conditioner having an indoor unit including a plurality of heat exchangers and a blower fan.

従来、室外機と室内機が冷媒配管で接続されて構成される空気調和機では、室内機での熱交換能力を向上させるために、室内機に複数個の室内熱交換器と送風ファンを設けるものが提案されている。例えば、特許文献１に記載の空気調和機では、室内機は、筐体上面および前面に設けられた吸込口と筐体前面下方に設けられた吹出口を結ぶ通気通路を有し、この空気通路が仕切体によって前方の第１空気通路と後方の第２空気通路に区画されている。そして、第１空気通路には第１室内熱交換器と第１送風ファンが設けられ、第２空気通路には第２室内熱交換器と第２送風ファンが設けられている。 Conventionally, in an air conditioner configured by connecting an outdoor unit and an indoor unit through a refrigerant pipe, the indoor unit is provided with a plurality of indoor heat exchangers and a blower fan in order to improve the heat exchange capability of the indoor unit. Things have been proposed. For example, in the air conditioner described in Patent Document 1, the indoor unit has a ventilation passage that connects a suction port provided on the upper surface and the front surface of the housing and a blower outlet provided below the front surface of the housing. Is partitioned into a first air passage at the front and a second air passage at the rear by a partition. The first air passage is provided with a first indoor heat exchanger and a first blower fan, and the second air passage is provided with a second indoor heat exchanger and a second blower fan.

上記の空気調和機が冷房運転あるいは暖房運転を行うときは、第１室内熱交換器と第２室内熱交換器の両方で室内空気と冷媒の熱交換が行われる。そして、各室内熱交換器で冷媒と熱交換を行った室内空気は、各送風ファンの回転によって各吹出口から室内に吹き出される。これにより、室内熱交換器と送風ファンを各々１つずつ設ける室内機に比べて、熱交換能力を向上させている。 When the air conditioner performs a cooling operation or a heating operation, heat is exchanged between the indoor air and the refrigerant in both the first indoor heat exchanger and the second indoor heat exchanger. And the indoor air which heat-exchanged with the refrigerant | coolant in each indoor heat exchanger is blown out indoors from each blower outlet by rotation of each ventilation fan. Thereby, compared with the indoor unit which provides one each of an indoor heat exchanger and one ventilation fan, the heat exchange capability is improved.

ところで、上述した特許文献１に記載の空気調和機のように、室内機に２つの空気通路を有し各空気通路に室内熱交換器と送風ファンを設けるものでは、各空気通路から吹き出される空気の温度を異ならせることで、以下に記載するような効果が得られる。 By the way, in an air conditioner described in Patent Document 1 described above, an indoor unit having two air passages and an indoor heat exchanger and a blower fan provided in each air passage is blown out from each air passage. The effects described below can be obtained by varying the temperature of the air.

例えば、冷房運転時に、一方の空気通路から吹き出される空調空気を部屋の窓際やドアの近く等の温度の高い領域に向け、この空気通路から吹き出される空調空気の温度を他方の空気通路から吹き出される空調空気の温度より低くする。これにより、部屋の温度ムラを少なくすることができる。また、空気通路を区画することで吹出口が上下に並ぶ配置となる場合に、上側の吹出口から吹き出される空調空気の温度を下側の吹出口から吹き出される空調空気の温度より低くすることで、暖房運転を行うときの暖気の浮き上がり（暖かい空気が上昇して部屋の上方に滞留する状態）や冷房運転を行うときの冷気落ち（冷たい空気が下降して部屋の下方に滞留する状態）を防止できる。 For example, during cooling operation, the conditioned air blown out from one air passage is directed to a high temperature area such as near the window of a room or near a door, and the temperature of the conditioned air blown out from the air passage is changed from the other air passage. Lower the temperature of the conditioned air that is blown out. Thereby, the temperature unevenness of the room can be reduced. Further, when the air outlets are arranged so that the air outlets are arranged vertically, the temperature of the conditioned air blown from the upper air outlet is made lower than the temperature of the conditioned air blown from the lower air outlet. This means that warm air rises when heating operation is performed (warm air rises and stays above the room) and cold air falls when cooling operation is performed (cold air descends and stays below the room) ) Can be prevented.

特開２００３−１８５１６８号公報JP 2003-185168 A

特許文献１に記載の空気調和機のように室内機に複数の室内熱交換器を有するものでは、各室内熱交換器が並列に接続されかつ各室内熱交換器の冷媒流量は１個の膨張弁で調整されるのが一般的である。このため、各空気通路から吹き出される空調空気の温度を異ならせたい場合は、各空気通路に設けられる送風ファンの回転数を変えて風量を変える必要がある。 When the indoor unit has a plurality of indoor heat exchangers like the air conditioner described in Patent Document 1, the indoor heat exchangers are connected in parallel, and the refrigerant flow rate of each indoor heat exchanger is one expansion. It is common to adjust with a valve. For this reason, when it is desired to vary the temperature of the conditioned air blown out from each air passage, it is necessary to change the air volume by changing the rotational speed of the blower fan provided in each air passage.

しかし、風量を変化させることのみで各空気通路から吹き出される空調空気の温度を異ならせる場合は、その温度差を大きくすることが困難であり、また、使用者が任意の風量とすることができないという問題があった。 However, when the temperature of the conditioned air blown out from each air passage is changed only by changing the air volume, it is difficult to increase the temperature difference, and the user may set an arbitrary air volume. There was a problem that I could not.

本発明は以上述べた問題点を解決するものであって、室内機に複数個の室内熱交換器と送風ファンを有し、各空気通路から吹き出される空調空気の温度を変更できる空気調和機を提供することを目的とする。 The present invention solves the above-described problems, and has an indoor unit having a plurality of indoor heat exchangers and a blower fan, and is capable of changing the temperature of conditioned air blown out from each air passage. The purpose is to provide.

上記の課題を解決するために、本発明の空気調和機は、室内機と室外機を有し、室内機は、本体筐体と、第１室内熱交換器と、第２室内熱交換器と、第１送風ファンと、第２送風ファンと、第１室内膨張弁と、第２室内膨張弁を有する。本体筐体は、吸込口と、第１吹出口と、第２吹出口と、吸込口と第１吹出口および第２吹出口を連通する空気通路を有する。第１吹出口と第２吹出口は、本体筐体の前面側の下部に上下に並べて配置されるとともに、第１吹出口が第２吹出口の上方に配置される。空気通路は、第１空気通路と第２空気通路に区画される。第１空気通路は、吸込口と第１吹出口を連通し、第１室内熱交換器と第１送風ファンが配置される。第２空気通路は、吸込口と第２吹出口を連通し、第２室内熱交換器と第２送風ファンが配置される。そして、第１室内熱交換器に接続される第１室内膨張弁と、第２室内熱交換器に接続される第２室内膨張弁を有する。 In order to solve the above problems, an air conditioner of the present invention includes an indoor unit and an outdoor unit, and the indoor unit includes a main body housing, a first indoor heat exchanger, and a second indoor heat exchanger. And a first blower fan, a second blower fan, a first indoor expansion valve, and a second indoor expansion valve. The main body housing has a suction port, a first air outlet, a second air outlet, and an air passage that communicates the suction port with the first air outlet and the second air outlet. The first blower outlet and the second blower outlet are arranged side by side in the lower part on the front side of the main body casing, and the first blower outlet is arranged above the second blower outlet. The air passage is divided into a first air passage and a second air passage. The first air passage communicates the suction port and the first outlet, and the first indoor heat exchanger and the first blower fan are disposed. The second air passage communicates the suction port and the second outlet, and the second indoor heat exchanger and the second blower fan are arranged. And it has the 1st indoor expansion valve connected to the 1st indoor heat exchanger, and the 2nd indoor expansion valve connected to the 2nd indoor heat exchanger.

上記のように構成した本発明の空気調和機によれば、第１室内膨張弁と第２室内膨張弁の開度を調整することによって、第１空気通路から吹き出される空調空気の温度と第２空気通路から吹き出される空調空気の温度を変更することができる。 According to the air conditioner of the present invention configured as described above, by adjusting the opening degrees of the first indoor expansion valve and the second indoor expansion valve, the temperature of the conditioned air blown from the first air passage and the first The temperature of the conditioned air blown out from the two air passages can be changed.

本発明の実施形態における、空気調和機の概略図である。It is the schematic of the air conditioner in embodiment of this invention. 図１に示す室内機のＸ−Ｘにおける要部断面図である。It is principal part sectional drawing in XX of the indoor unit shown in FIG. 本発明の実施形態における、空気調和機の冷媒回路図である。It is a refrigerant circuit diagram of the air conditioner in the embodiment of the present invention.

以下、本発明の実施の形態を、添付図面に基づいて詳細に説明する。実施形態としては、１台の室外機と１台の室内機を有しこれらが冷媒配管で接続された空気調和機を例に挙げて説明する。尚、本発明は以下の実施形態に限定されることはなく、本発明の主旨を逸脱しない範囲で種々変形することが可能である。 Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. As an embodiment, an air conditioner having one outdoor unit and one indoor unit and connected by a refrigerant pipe will be described as an example. The present invention is not limited to the following embodiments, and can be variously modified without departing from the gist of the present invention.

図１に示すように、本実施例における空気調和機１は、屋外に設置される室外機２と、室外機２に液管４およびガス管５で接続され部屋に設置される室内機３を備えている。 As shown in FIG. 1, an air conditioner 1 in this embodiment includes an outdoor unit 2 installed outdoors, and an indoor unit 3 connected to the outdoor unit 2 through a liquid pipe 4 and a gas pipe 5 and installed in a room. I have.

まずは、室内機３について説明する。図１および図２に示すように、室内機３は本体筐体である室内機本体３０を有している。室内機本体３０は、上面パネル３ａと、前面パネル３ｂと、第３ケーシング３ｅと、右側面パネル３ｊと、左側面パネル３ｋと、開閉パネル３ｈで形成される。これら各部材は、合成樹脂材で形成される。室内機本体３０は、上記各部材が組み合わされて、横長の直方体形状に形成される。 First, the indoor unit 3 will be described. As shown in FIGS. 1 and 2, the indoor unit 3 includes an indoor unit main body 30 that is a main body housing. The indoor unit body 30 is formed by an upper panel 3a, a front panel 3b, a third casing 3e, a right side panel 3j, a left side panel 3k, and an open / close panel 3h. Each of these members is formed of a synthetic resin material. The indoor unit main body 30 is formed in a horizontally long rectangular parallelepiped shape by combining the above-described members.

上面パネル３ａは長方形状に形成されて室内機本体３０の上面を形成する。上面パネル３ａには、室内機本体３０の内部に空気を取り込むための上面吸込口３ａａが設けられている。前面パネル３ｂは長方形状に形成されて室内機本体３０の前面を形成する。前面パネル３ｂには、室内機本体３０の内部に空気を取り込むための前面吸込口３ｂａが設けられている。第３ケーシング３ｅは、第２送風ファン３３ｂの外形に応じた円弧形状とこの円弧の両端に各々接続する直線を組み合わせた形状とされて、室内機本体３０の底面と背面と形成する。右側面パネル３ｊと左側面パネル３ｋは、それぞれが略台形形状に形成されて室内機本体３０の右側面と左側面を形成する。 The upper panel 3 a is formed in a rectangular shape and forms the upper surface of the indoor unit body 30. The top panel 3a is provided with a top suction port 3aa for taking air into the interior of the indoor unit body 30. The front panel 3 b is formed in a rectangular shape and forms the front surface of the indoor unit body 30. The front panel 3b is provided with a front suction port 3ba for taking air into the interior of the indoor unit body 30. The 3rd casing 3e is made into the shape which combined the circular arc shape according to the external shape of the 2nd ventilation fan 33b, and the straight line respectively connected to the both ends of this circular arc, and forms the bottom face and back surface of the indoor unit main body 30. The right side panel 3j and the left side panel 3k are each formed in a substantially trapezoidal shape and form the right side and the left side of the indoor unit body 30.

開閉パネル３ｈは、前面パネル３ｂの一部を覆うように配置されて室内機３の意匠面を形成する。開閉パネル３ｈは、前面パネル３ｂに開閉自在に取り付けられる。開閉パネル３ｈは、室内機３の停止時は閉じ、室内機３の運転時は開いて前面パネル３ｂの前面吸込口３ｂａから室内機本体３０の内部に空気を取り込めるようにする。 The open / close panel 3h is disposed so as to cover a part of the front panel 3b and forms a design surface of the indoor unit 3. The open / close panel 3h is attached to the front panel 3b so as to be openable and closable. The open / close panel 3h is closed when the indoor unit 3 is stopped, and is opened when the indoor unit 3 is in operation so that air can be taken into the interior of the indoor unit body 30 from the front suction port 3ba of the front panel 3b.

室内機本体３０の前面パネル３ｂの下方には、第１吹出口３ｆと第２吹出口３ｇが上下に並べて設けられている。第１吹出口３ｆには、第１上下風向板３ｆａが上下方向に回動自在に設けられている。第２吹出口３ｇには、第２上下風向板３ｇａが上下方向に回動自在に設けられている。尚、第１吹出口３ｆと第２吹出口３ｇの一方あるいはそれぞれに左右風向板を設けてもよい。
尚、図２に示す断面図では、上述した開閉パネル３ｈの図示は省略している。 Below the front panel 3b of the indoor unit body 30, a first air outlet 3f and a second air outlet 3g are provided vertically. A first vertical airflow direction plate 3fa is provided at the first air outlet 3f so as to be rotatable in the vertical direction. A second vertical airflow direction plate 3ga is provided at the second air outlet 3g so as to be rotatable in the vertical direction. In addition, you may provide a left-right wind direction board in one or each of the 1st blower outlet 3f and the 2nd blower outlet 3g.
In the cross-sectional view shown in FIG. 2, the above-described opening / closing panel 3h is not shown.

図２に示すように、室内機本体３０の内部には、主に前面吸込口３ｂａと第１吹出口３ｆを連通する第１空気通路３０１と、主に上面吸込口３ａａと第２吹出口３ｇを連通する第２空気通路３０２が設けられている。具体的には、室内機本体３０の内部は仕切部材である第２ケーシング３ｄで前後に区画されている。第１ケーシング３ｃと第２ケーシング３ｄで第１空気通路３０１が形成される。第２ケーシング３ｄと第３ケーシング３ｅで第２空気通路３０２が形成される。 As shown in FIG. 2, the interior of the indoor unit main body 30 includes a first air passage 301 that mainly communicates the front inlet 3ba and the first outlet 3f, and mainly the upper inlet 3aa and the second outlet 3g. A second air passage 302 that communicates with each other is provided. Specifically, the interior of the indoor unit main body 30 is partitioned forward and backward by a second casing 3d that is a partition member. A first air passage 301 is formed by the first casing 3c and the second casing 3d. A second air passage 302 is formed by the second casing 3d and the third casing 3e.

第１ケーシング３ｃと第２ケーシング３ｄと第３ケーシング３ｅは、各々合成樹脂材で形成されている。第１ケーシング３ｃは、断面形状がヘ字状とされて前面パネル３ｂの下端部に固定されている。第１ケーシング３ｃの一部は第１ドレンパン３ｃａとされている。第１ドレンパン３ｃａは、後述する第１室内熱交換器３１ａで発生する凝縮水を受ける。第２ケーシング３ｄは、断面形状が第１送風ファン３３ａの外形に応じた円弧形状とされて室内機本体３０の左右側面に固定されている。第２ケーシング３ｄの上端部は第２ドレンパン３ｄａとされている。第２ドレンパン３ｄａは、第１室内熱交換器３１ａおよび後述する第２室内熱交換器３１ｂで発生する凝縮水を受ける。第３ケーシング３ｅは、前述したように断面形状が第２送風ファン３３ｂの外形に応じた円弧形状とこの円弧の両端に各々接続する直線を組み合わせた形状とされて室内機本体３０の上面パネル３ａと右側面パネル３ｊと左側面パネル３ｋに固定されている。第３ケーシング３ｅの一部は第３ドレンパン３ｅａとされている。第３ドレンパン３ｅａは、第２室内熱交換器３１ｂで発生する凝縮水を受ける。 The first casing 3c, the second casing 3d, and the third casing 3e are each formed of a synthetic resin material. The first casing 3c has a cross-sectional shape that is fixed to the lower end of the front panel 3b. A part of the first casing 3c is a first drain pan 3ca. The 1st drain pan 3ca receives the condensed water which generate | occur | produces in the 1st indoor heat exchanger 31a mentioned later. The second casing 3d has an arc shape corresponding to the outer shape of the first blower fan 33a and is fixed to the left and right side surfaces of the indoor unit body 30. The upper end portion of the second casing 3d is a second drain pan 3da. The second drain pan 3da receives condensed water generated in the first indoor heat exchanger 31a and a second indoor heat exchanger 31b described later. As described above, the third casing 3e has a cross-sectional shape that is a combination of an arc shape corresponding to the outer shape of the second blower fan 33b and straight lines connected to both ends of the arc, and the upper panel 3a of the indoor unit body 30. And fixed to the right side panel 3j and the left side panel 3k. A part of the third casing 3e is a third drain pan 3ea. The third drain pan 3ea receives condensed water generated in the second indoor heat exchanger 31b.

以上説明した室内機３の室内機本体３０の内部には、図２および図３に示すように、第１室内熱交換器３１ａおよび第２室内熱交換器３１ｂと、第１室内膨張弁３２ａおよび第２室内膨張弁３２ｂと、液管４の一端が接続された液管接続部３４と、ガス管５の一端が接続されたガス管接続部３５と、第１送風ファン３３ａおよび第２送風ファン３３ｂを備えている。そして、第１送風ファン３３ａおよび第２送風ファン３３ｂを除くこれら各装置が以下で詳述する各冷媒配管で相互に接続されて、室内機冷媒回路１０ｂを構成している。 Inside the indoor unit main body 30 of the indoor unit 3 described above, as shown in FIGS. 2 and 3, the first indoor heat exchanger 31a and the second indoor heat exchanger 31b, the first indoor expansion valve 32a, and The second indoor expansion valve 32b, the liquid pipe connection part 34 to which one end of the liquid pipe 4 is connected, the gas pipe connection part 35 to which one end of the gas pipe 5 is connected, the first blower fan 33a and the second blower fan 33b. And these each apparatuses except the 1st ventilation fan 33a and the 2nd ventilation fan 33b are mutually connected by each refrigerant | coolant piping explained in full detail below, and comprise the indoor unit refrigerant circuit 10b.

図２に示すように、第１室内熱交換器３１ａは、第１空気通路３０１の上流側に配置されている。第１室内熱交換器３１ａは、逆Ｖ字状に折り曲げて形成されており、その一端が第１ドレンパン３ｃａの上方に配置され、他端が第２ドレンパン３ｄａの上方に配置される。第１室内熱交換器３１ａは、冷媒と第１送風ファン３３ａの回転により主に前面吸込口３ｂａから第１空気通路３０１に流入する空気を熱交換させるものである。第１室内熱交換器３１ａの一方の冷媒出入口には第１液分管６８ａの一端が接続され、第１液分管６８ａの他端は、接続点Ｌで室内機液管６８と接続されている。また、第１室内熱交換器３１ａの他方の冷媒出入口には第１ガス分管６９ａの一端が接続され、第１ガス分管６９ａの他端は、接続点Ｇで室内機ガス管６９と接続されている。 As shown in FIG. 2, the first indoor heat exchanger 31 a is disposed on the upstream side of the first air passage 301. The first indoor heat exchanger 31a is formed to be bent in an inverted V shape, and one end thereof is disposed above the first drain pan 3ca and the other end is disposed above the second drain pan 3da. The first indoor heat exchanger 31a exchanges heat mainly between the air flowing into the first air passage 301 from the front suction port 3ba by the rotation of the refrigerant and the first blower fan 33a. One end of the first liquid distribution pipe 68a is connected to one refrigerant inlet / outlet of the first indoor heat exchanger 31a, and the other end of the first liquid distribution pipe 68a is connected to the indoor unit liquid pipe 68 at the connection point L. One end of the first gas distribution pipe 69a is connected to the other refrigerant inlet / outlet of the first indoor heat exchanger 31a, and the other end of the first gas distribution pipe 69a is connected to the indoor unit gas pipe 69 at the connection point G. Yes.

第２室内熱交換器３１ｂは、第２空気通路３０２の上流側に配置されている。第２室内熱交換器３１ｂは、逆Ｖ字状に折り曲げて形成されており、その一端が第２ドレンパン３ｄａの上方に配置され、他端が第３ドレンパン３ｅａの上方に配置される。第２室内熱交換器３１ｂは、冷媒と第２送風ファン３３ｂの回転により主に上面吸込口３ａａから第２空気通路３０２に流入する空気を熱交換させるものである。第２室内熱交換器３１ｂの一方の冷媒出入口には第２液分管６８ｂの一端が接続され、第２液分管６８ｂの他端は、接続点Ｌで室内機液管６８および第１液分管６８ａと接続されている。また、第２室内熱交換器３１ｂの他方の冷媒出入口には第２ガス分管６９ｂの一端が接続され、第２ガス分管６９ｂの他端は、接続点Ｇで室内機ガス管６９および第１ガス分管６９ａと接続されている。 The second indoor heat exchanger 31 b is disposed on the upstream side of the second air passage 302. The second indoor heat exchanger 31b is formed by bending in an inverted V shape, and one end thereof is disposed above the second drain pan 3da and the other end is disposed above the third drain pan 3ea. The second indoor heat exchanger 31b exchanges heat mainly between the air flowing into the second air passage 302 from the upper surface suction port 3aa by the rotation of the refrigerant and the second blower fan 33b. One refrigerant outlet / inlet of the second indoor heat exchanger 31b is connected to one end of the second liquid distribution pipe 68b. The other end of the second liquid distribution pipe 68b is connected to the indoor unit liquid pipe 68 and the first liquid distribution pipe 68a at the connection point L. Connected with. One end of the second gas distribution pipe 69b is connected to the other refrigerant inlet / outlet of the second indoor heat exchanger 31b, and the other end of the second gas distribution pipe 69b is connected to the indoor unit gas pipe 69 and the first gas at the connection point G. It is connected to the branch pipe 69a.

尚、室内機液管６８の他端は、液管接続部３４に接続され、室内機ガス管６９の他端は、ガス管接続部３５に接続される。液管接続部３４やガス管接続部３５では、各冷媒配管が溶接やフレアナット等により接続されている。 The other end of the indoor unit liquid pipe 68 is connected to the liquid pipe connecting part 34, and the other end of the indoor unit gas pipe 69 is connected to the gas pipe connecting part 35. In the liquid pipe connection part 34 and the gas pipe connection part 35, each refrigerant pipe is connected by welding, a flare nut, or the like.

第１室内熱交換器３１ａと第２室内熱交換器３１ｂは、室内機３が冷房運転を行う場合は蒸発器として機能し、室内機３が暖房運転を行う場合は凝縮器として機能する。そして、本実施形態では、第１室内熱交換器３１ａと第２室内熱交換器３１ｂは、同じ熱交換容量を有する。ここで、熱交換容量とは、熱交換器の単位面積を通過する風量が一定である場合の冷媒と空気の間で行われる熱交換量を意味し、熱交換器Ａより熱交換器Ｂの方が熱交換容量が大きいということは、熱交換器Ｂの方が熱交換器Ａより熱交換量が多いことを示す。 The first indoor heat exchanger 31a and the second indoor heat exchanger 31b function as an evaporator when the indoor unit 3 performs a cooling operation, and function as a condenser when the indoor unit 3 performs a heating operation. In the present embodiment, the first indoor heat exchanger 31a and the second indoor heat exchanger 31b have the same heat exchange capacity. Here, the heat exchange capacity means the amount of heat exchange performed between the refrigerant and the air when the air volume passing through the unit area of the heat exchanger is constant. That the heat exchange capacity is larger indicates that the heat exchanger B has a larger amount of heat exchange than the heat exchanger A.

第１室内膨張弁３２ａは、第１ガス分管６９ａに設けられている。第１室内膨張弁３２ａは電子膨張弁である。第２室内膨張弁３２ｂは、第２ガス分管６９ｂに設けられている。第２室内膨張弁３２ｂは電子膨張弁である。第１室内膨張弁３２ａと第２室内膨張弁３２ｂは、後述する第１吹出温度と第２吹出温度を異ならせる際に、その開度が調整される。 The first indoor expansion valve 32a is provided in the first gas distribution pipe 69a. The first indoor expansion valve 32a is an electronic expansion valve. The second indoor expansion valve 32b is provided in the second gas distribution pipe 69b. The second indoor expansion valve 32b is an electronic expansion valve. The opening degree of the first indoor expansion valve 32a and the second indoor expansion valve 32b is adjusted when differentiating a first blowing temperature and a second blowing temperature described later.

尚、本実施形態では、第１室内膨張弁３２ａと第２室内膨張弁３２ｂの弁径は同じである。つまり、第１室内膨張弁３２ａと第２室内膨張弁３２ｂの図示しないステッピングモータの各々に同じパルスを加えたとき、第１室内膨張弁３２ａと第２室内膨張弁３２ｂの開度が同じとなる。 In the present embodiment, the first indoor expansion valve 32a and the second indoor expansion valve 32b have the same valve diameter. That is, when the same pulse is applied to each of the stepping motors (not shown) of the first indoor expansion valve 32a and the second indoor expansion valve 32b, the opening degrees of the first indoor expansion valve 32a and the second indoor expansion valve 32b become the same. .

第１送風ファン３３ａは合成樹脂材で形成されており、図２に示すように、第１空気通路３０１内かつ第１室内熱交換器３１ａの下流側に配置されている。第１送風ファン３３ａは、図示しないファンモータによって回転することで、主に前面吸込口３ｂａから第１空気通路３０１に空気を取り込み、第１室内熱交換器３１ａにおいて冷媒と熱交換した空気を第１吹出口３ｆから室内へ吹き出す。 The 1st ventilation fan 33a is formed with the synthetic resin material, and as shown in FIG. 2, it is arrange | positioned in the 1st air path 301 and the downstream of the 1st indoor heat exchanger 31a. The first blower fan 33a is rotated by a fan motor (not shown) so that air is mainly taken into the first air passage 301 from the front suction port 3ba and the air that has exchanged heat with the refrigerant in the first indoor heat exchanger 31a. It blows out indoors from the 1 outlet 3f.

第２送風ファン３３ｂは合成樹脂材で形成されており、図２に示すように、第２空気通路３０２内かつ第２室内熱交換器３１ｂの下流側に配置されている。第２送風ファン３３ｂは、図示しないファンモータによって回転することで、主に上面吸込口３ａａから第２空気通路３０２に空気を取り込み、第２室内熱交換器３１ｂにおいて冷媒と熱交換した空気を第２吹出口３ｇから室内へ吹き出す。 The 2nd ventilation fan 33b is formed with the synthetic resin material, and as shown in FIG. 2, it is arrange | positioned in the 2nd air path 302 and the downstream of the 2nd indoor heat exchanger 31b. The second blower fan 33b is rotated by a fan motor (not shown) to mainly take air into the second air passage 302 from the upper surface inlet 3aa, and the second indoor heat exchanger 31b exchanges heat with refrigerant. It blows out into the room from 2g outlet 3g.

尚、本実施形態では、第１送風ファン３３ａと第２送風ファン３３ｂは同じものである。つまり、第１送風ファン３３ａと第２送風ファン３３ｂの各モータを同じ回転数で駆動したとき、第１送風ファン３３ａの送風量と第２送風ファン３３ｂの送風量が同じとなる。 In the present embodiment, the first blower fan 33a and the second blower fan 33b are the same. That is, when the motors of the first blower fan 33a and the second blower fan 33b are driven at the same rotation speed, the blower amount of the first blower fan 33a and the blower amount of the second blower fan 33b are the same.

以上説明した構成の他に、室内機３には各種のセンサが設けられている。第１液分管６８ａには、第１室内熱交換器３１ａに流出入する冷媒の温度を検出する第１液側温度センサ７７ａが設けられている。第２液分管６８ｂには、第２室内熱交換器３１ｂに流出入する冷媒の温度を検出する第２液側温度センサ７７ｂが設けられている。第１ガス分管６９ａにおける第１室内熱交換器３１ａと第１室内膨張弁３２ａの間には、第１室内熱交換器３１ａに流出入する冷媒の温度を検出する第１ガス側温度センサ７８ａが設けられている。第２ガス分管６９ｂにおける第２室内熱交換器３１ｂと第２室内膨張弁３２ｂの間には、第２室内熱交換器３１ｂに流出入する冷媒の温度を検出する第２ガス側温度センサ７８ｂが設けられている。そして、第１室内熱交換器３１ａ付近には、室内機本体３０に流入する空気の温度、すなわち室内温度を検出する室内温度センサ７９が備えられている。 In addition to the configuration described above, the indoor unit 3 is provided with various sensors. The first liquid distribution pipe 68a is provided with a first liquid side temperature sensor 77a that detects the temperature of the refrigerant flowing into and out of the first indoor heat exchanger 31a. The second liquid distribution pipe 68b is provided with a second liquid side temperature sensor 77b that detects the temperature of the refrigerant flowing into and out of the second indoor heat exchanger 31b. Between the 1st indoor heat exchanger 31a and the 1st indoor expansion valve 32a in the 1st gas distribution pipe 69a, the 1st gas side temperature sensor 78a which detects the temperature of the refrigerant which flows in and out to the 1st indoor heat exchanger 31a. Is provided. Between the 2nd indoor heat exchanger 31b and the 2nd indoor expansion valve 32b in the 2nd gas distribution pipe 69b, the 2nd gas side temperature sensor 78b which detects the temperature of the refrigerant which flows in and out to the 2nd indoor heat exchanger 31b. Is provided. In the vicinity of the first indoor heat exchanger 31a, an indoor temperature sensor 79 for detecting the temperature of the air flowing into the indoor unit body 30, that is, the indoor temperature is provided.

次に、図１および図３を用いて、室外機２について説明する。図１に示すように、室外機２は縦長の直方体形状に形成された筐体を有し、筐体前面に吹出口２ａを有するとともに、筐体背面および左側面に図示しない吸込口を有している。 Next, the outdoor unit 2 will be described with reference to FIGS. 1 and 3. As shown in FIG. 1, the outdoor unit 2 has a casing formed in a vertically long rectangular parallelepiped shape, has a blower outlet 2a on the front face of the casing, and has suction ports (not shown) on the rear face and the left side face of the casing. ing.

図３に示すように、室外機２は、圧縮機２１と、四方弁２２と、室外熱交換器２３と、液管４の他端が接続された閉鎖弁２５と、ガス管５の他端が接続された閉鎖弁２６と、アキュムレータ２７と、室外ファン２８を備えている。そして、室外ファン２８を除くこれら各装置が以下で詳述する各冷媒配管で相互に接続されて、室外機冷媒回路１０ａを構成している。 As shown in FIG. 3, the outdoor unit 2 includes a compressor 21, a four-way valve 22, an outdoor heat exchanger 23, a closing valve 25 to which the other end of the liquid pipe 4 is connected, and the other end of the gas pipe 5. Are connected to a closing valve 26, an accumulator 27, and an outdoor fan 28. And these each apparatus except the outdoor fan 28 is mutually connected by each refrigerant | coolant piping explained in full detail below, and comprises the outdoor unit refrigerant circuit 10a.

圧縮機２１は、図示しないインバータにより回転数が制御されるモータによって駆動されることで、運転容量を可変できる能力可変型圧縮機である。圧縮機２１の冷媒吐出側は、四方弁２２のポートａに吐出管６１で接続されており、また、圧縮機２１の冷媒吸入側は、アキュムレータ２７の冷媒流出側と吸入管６６で接続されている。 The compressor 21 is a variable capacity compressor that can vary the operating capacity by being driven by a motor whose rotational speed is controlled by an inverter (not shown). The refrigerant discharge side of the compressor 21 is connected to the port a of the four-way valve 22 by a discharge pipe 61, and the refrigerant suction side of the compressor 21 is connected to the refrigerant outflow side of the accumulator 27 by a suction pipe 66. Yes.

四方弁２２は、冷媒の流れる方向を切り換えるための弁であり、ａ、ｂ、ｃ、ｄの４つのポートを備えている。ポートａは、上述したように圧縮機２１の冷媒吐出側と吐出管６１で接続されている。ポートｂは、室外熱交換器２３の一方の冷媒出入口と冷媒配管６２で接続されている。ポートｃは、アキュムレータ２７の冷媒流入側と冷媒配管６５で接続されている。そして、ポートｄは、閉鎖弁２６と室外機ガス管６４で接続されている。 The four-way valve 22 is a valve for switching the direction in which the refrigerant flows, and includes four ports a, b, c, and d. The port a is connected to the refrigerant discharge side of the compressor 21 by the discharge pipe 61 as described above. The port b is connected to one refrigerant inlet / outlet of the outdoor heat exchanger 23 by a refrigerant pipe 62. The port c is connected to the refrigerant inflow side of the accumulator 27 by a refrigerant pipe 65. The port d is connected to the shutoff valve 26 and the outdoor unit gas pipe 64.

室外熱交換器２３は、冷媒と、後述する室外ファン２８の回転により室外機２の内部に取り込まれた外気を熱交換させるものである。室外熱交換器２３の一方の冷媒出入口は、上述したように四方弁２２のポートｂと冷媒配管６２で接続され、他方の冷媒出入口は室外機液管６３で閉鎖弁２５に接続されている。 The outdoor heat exchanger 23 exchanges heat between the refrigerant and the outside air taken into the outdoor unit 2 by the rotation of the outdoor fan 28 described later. As described above, one refrigerant inlet / outlet of the outdoor heat exchanger 23 is connected to the port b of the four-way valve 22 by the refrigerant pipe 62, and the other refrigerant inlet / outlet is connected to the closing valve 25 by the outdoor unit liquid pipe 63.

室外ファン２８は合成樹脂材で形成されており、室外熱交換器２３の近傍に配置されている。室外ファン２８は、図示しないファンモータによって回転することで図示しない吸込口から室外機２の内部へ外気を取り込み、室外熱交換器２３において冷媒と熱交換した外気を吹出口２ａから室外機２の外部へ放出する。 The outdoor fan 28 is made of a synthetic resin material and is disposed in the vicinity of the outdoor heat exchanger 23. The outdoor fan 28 is rotated by a fan motor (not shown) to take outside air from a suction port (not shown) into the outdoor unit 2, and the outdoor air heat exchanged with the refrigerant in the outdoor heat exchanger 23 is discharged from the outlet 2 a of the outdoor unit 2. Release to the outside.

アキュムレータ２７は、上述したように、冷媒流入側が四方弁２２のポートｃと冷媒配管６５で接続され、冷媒流出側が圧縮機２１の吸入ポート２６０と吸入管６６で接続されている。アキュムレータ２７は、冷媒配管６５からアキュムレータ２７の内部に流入した冷媒から冷凍機油を分離するとともに、冷媒をガス冷媒と液冷媒とに分離してガス冷媒のみを圧縮機２１に吸入させる。 As described above, the accumulator 27 has the refrigerant inflow side connected to the port c of the four-way valve 22 and the refrigerant pipe 65, and the refrigerant outflow side is connected to the intake port 260 and the intake pipe 66 of the compressor 21. The accumulator 27 separates the refrigerating machine oil from the refrigerant flowing into the accumulator 27 from the refrigerant pipe 65 and separates the refrigerant into a gas refrigerant and a liquid refrigerant and causes the compressor 21 to suck only the gas refrigerant.

以上説明した構成の他に、室外機２には各種のセンサが設けられている。図３に示すように、吐出管６１には、圧縮機２１から吐出される冷媒の圧力である吐出圧力を検出する高圧センサ７１と、圧縮機２１から吐出される冷媒の温度を検出する吐出温度センサ７３が設けられている。冷媒配管６５には、圧縮機２１に吸入される冷媒の圧力である吸入圧力を検出する低圧センサ７２と、圧縮機２１に吸入される冷媒の温度を検出する吸入温度センサ７４とが設けられている。 In addition to the configuration described above, the outdoor unit 2 is provided with various sensors. As shown in FIG. 3, the discharge pipe 61 includes a high pressure sensor 71 that detects a discharge pressure that is a pressure of the refrigerant discharged from the compressor 21, and a discharge temperature that detects the temperature of the refrigerant discharged from the compressor 21. A sensor 73 is provided. The refrigerant pipe 65 is provided with a low pressure sensor 72 that detects a suction pressure that is a pressure of the refrigerant sucked into the compressor 21 and a suction temperature sensor 74 that detects a temperature of the refrigerant sucked into the compressor 21. Yes.

室外機液管６３における室外熱交換器２３と室外膨張弁２４の間には、室外熱交換器２３に流出入する冷媒の温度を検出する熱交温度センサ７５が設けられている。そして、室外熱交換器２３付近には、室外機２の内部に流入する外気の温度、すなわち外気温度を検出する外気温度センサ７６が備えられている。 Between the outdoor heat exchanger 23 and the outdoor expansion valve 24 in the outdoor unit liquid pipe 63, a heat exchange temperature sensor 75 that detects the temperature of the refrigerant flowing into and out of the outdoor heat exchanger 23 is provided. In the vicinity of the outdoor heat exchanger 23, an outside air temperature sensor 76 that detects the temperature of the outside air flowing into the outdoor unit 2, that is, the outside air temperature, is provided.

以上説明した室外機２の室外機冷媒回路１０ａと室内機３の室内機冷媒回路１０ｂが液管４とガス管５で接続されて、空気調和機１の冷媒回路１０が構成される。 The outdoor unit refrigerant circuit 10a of the outdoor unit 2 described above and the indoor unit refrigerant circuit 10b of the indoor unit 3 are connected by the liquid pipe 4 and the gas pipe 5 to constitute the refrigerant circuit 10 of the air conditioner 1.

次に、本実施形態における空気調和機１の空調運転時の冷媒回路１０における冷媒の流れや各部の動作について、図３を用いて説明する。尚、以下の説明では、まず室内機３が冷房運転を行う場合について説明し、次に室内機３が暖房運転を行う場合について説明する。尚、図３における実線矢印は冷房運転時の冷媒の流れを示し、破線矢印は暖房運転時の冷媒の流れを示している。
＜冷房運転＞ Next, the flow of the refrigerant and the operation of each part in the refrigerant circuit 10 during the air conditioning operation of the air conditioner 1 in the present embodiment will be described with reference to FIG. In the following description, the case where the indoor unit 3 performs the cooling operation will be described first, and then the case where the indoor unit 3 performs the heating operation will be described. In addition, the solid line arrow in FIG. 3 shows the flow of the refrigerant during the cooling operation, and the broken line arrow shows the flow of the refrigerant during the heating operation.
<Cooling operation>

図３に示すように、室内機３が冷房運転を行う場合、室外機２の四方弁２２は実線で示す状態、すなわち、四方弁２２のポートａとポートｂとが連通するよう、また、ポートｃとポートｄとが連通するよう、切り換えられる。これにより、冷媒回路１０を、冷媒が実線矢印で示す方向に循環する状態、つまり、室外熱交換器２３が凝縮器として機能させるとともに第１室内熱交換器３１ａと第２室内熱交換器３１ｂがともに蒸発器として機能させる冷房サイクルとする。 As shown in FIG. 3, when the indoor unit 3 performs a cooling operation, the four-way valve 22 of the outdoor unit 2 is in a state indicated by a solid line, that is, the port a and the port b of the four-way valve 22 communicate with each other. It is switched so that c and port d communicate. Thus, the refrigerant circulates in the refrigerant circuit 10 in the direction indicated by the solid arrows, that is, the outdoor heat exchanger 23 functions as a condenser, and the first indoor heat exchanger 31a and the second indoor heat exchanger 31b Both are cooling cycles that function as an evaporator.

圧縮機２１から吐出された高圧の冷媒は、吐出管６１を流れて四方弁２２に流入し、四方弁２２から冷媒配管６２を流れて室外熱交換器２３に流入する。室外熱交換器２３に流入した冷媒は、室外ファン２８の回転により室外機２の内部に取り込まれた外気と熱交換を行って凝縮する。 The high-pressure refrigerant discharged from the compressor 21 flows through the discharge pipe 61 and flows into the four-way valve 22, flows from the four-way valve 22 through the refrigerant pipe 62, and flows into the outdoor heat exchanger 23. The refrigerant flowing into the outdoor heat exchanger 23 is condensed by exchanging heat with the outside air taken into the outdoor unit 2 by the rotation of the outdoor fan 28.

室外熱交換器２３から流出した冷媒は室外機液管６３を流れ、全開とされている室外膨張弁２４および閉鎖弁２５を介して液管４に流出する。液管４を流れ液管接続部３４を介して室内機３に流入した冷媒は、室外機液管６８を流れて接続点Ｌで第１液分管６８ａと第２液分管６８ｂに分流する。 The refrigerant that has flowed out of the outdoor heat exchanger 23 flows through the outdoor unit liquid pipe 63, and flows out to the liquid pipe 4 through the outdoor expansion valve 24 and the closing valve 25 that are fully opened. The refrigerant flowing through the liquid pipe 4 and flowing into the indoor unit 3 via the liquid pipe connecting portion 34 flows through the outdoor unit liquid pipe 68 and is divided into the first liquid distribution pipe 68a and the second liquid distribution pipe 68b at the connection point L.

第１液分管６８ａに分流した冷媒は第１室内熱交換器３１ａに流入し、第１送風ファン３３ａの回転により第１空気通路３０１に流入した空気と熱交換を行って蒸発する。一方、第２液分管６８ｂに分流した冷媒は第２室内熱交換器３１ｂに流入し、第２送風ファン３３ｂの回転により第２空気通路３０２に流入した空気と熱交換を行って蒸発する。このように、第１室内熱交換器３１ａと第２室内熱交換器３１ｂが蒸発器として機能し、第１室内熱交換器３１ａで冷媒と熱交換を行った空気が第１吹出口３ｆから、第２室内熱交換器３１ｂで冷媒と熱交換を行った空気が第２吹出口３ｇから、それぞれ室内に吹き出されることによって、室内機３が設置された部屋の冷房が行われる。 The refrigerant branched into the first liquid distribution pipe 68a flows into the first indoor heat exchanger 31a and evaporates by exchanging heat with the air flowing into the first air passage 301 by the rotation of the first blower fan 33a. On the other hand, the refrigerant branched into the second liquid distribution pipe 68b flows into the second indoor heat exchanger 31b and evaporates by exchanging heat with the air flowing into the second air passage 302 by the rotation of the second blower fan 33b. Thus, the 1st indoor heat exchanger 31a and the 2nd indoor heat exchanger 31b function as an evaporator, and the air which exchanged heat with the refrigerant in the 1st indoor heat exchanger 31a is from the 1st blower outlet 3f. Air that has exchanged heat with the refrigerant in the second indoor heat exchanger 31b is blown into the room from the second outlet 3g, whereby the room in which the indoor unit 3 is installed is cooled.

第１室内熱交換器３１ａから第１ガス分管６９ａに流出し第１室内膨張弁３２ａで減圧された冷媒と、第２室内熱交換器３１ｂから第２ガス分管６９ｂに流出し第２室内膨張弁３２ｂで減圧された冷媒は、接続点Ｇで合流して室外機ガス管６９に流入し、ガス管接続部３５を介してガス管５に流出する。ガス管５を流れ閉鎖弁２６を介して室外機２に流入した冷媒は、室外機ガス管６４、四方弁２２、冷媒配管６５、アキュムレータ２８、吸入管６６の順に流れ、圧縮機２１に吸入されて再び圧縮される。
＜暖房運転＞ The refrigerant flowing out from the first indoor heat exchanger 31a into the first gas distribution pipe 69a and decompressed by the first indoor expansion valve 32a, and the refrigerant flowing out from the second indoor heat exchanger 31b into the second gas distribution pipe 69b and into the second indoor expansion valve. The refrigerant decompressed at 32 b joins at the connection point G, flows into the outdoor unit gas pipe 69, and flows out to the gas pipe 5 through the gas pipe connection portion 35. The refrigerant flowing through the gas pipe 5 and flowing into the outdoor unit 2 through the closing valve 26 flows in the order of the outdoor unit gas pipe 64, the four-way valve 22, the refrigerant pipe 65, the accumulator 28, and the suction pipe 66, and is sucked into the compressor 21. And compressed again.
<Heating operation>

図３に示すように、室内機３で暖房運転を行う場合、室外機２の四方弁２２は破線で示す状態、すなわち、四方弁２２のポートａとポートｄとが連通するよう、また、ポートｂとポートｃとが連通するよう、切り換えられる。これにより、冷媒回路１０を、冷媒が破線矢印で示す方向に循環する状態、つまり、室外熱交換器２３が蒸発器として機能させるとともに第１室内熱交換器３１ａと第２室内熱交換器３１ｂがともに凝縮器として機能させる暖房サイクルとする。 As shown in FIG. 3, when heating operation is performed in the indoor unit 3, the four-way valve 22 of the outdoor unit 2 is in a state indicated by a broken line, that is, the port a and the port d of the four-way valve 22 communicate with each other. It is switched so that b and port c communicate. Thus, the refrigerant circulates in the refrigerant circuit 10 in the direction indicated by the broken arrow, that is, the outdoor heat exchanger 23 functions as an evaporator, and the first indoor heat exchanger 31a and the second indoor heat exchanger 31b Both are heating cycles that function as condensers.

圧縮機２１から吐出された高圧の冷媒は、吐出管６１を流れて四方弁２２に流入し、四方弁２２から室外機ガス管６４、閉鎖弁２６、ガス管５の順に流れて、ガス管接続部３５を介して室内機３に流入する。室内機３に流入した冷媒は、室内機ガス管６９を流れて接続点Ｇで第１ガス分管６９ａと第２ガス分管６９ｂに分流する。 The high-pressure refrigerant discharged from the compressor 21 flows through the discharge pipe 61 and flows into the four-way valve 22, then flows from the four-way valve 22 to the outdoor unit gas pipe 64, the shut-off valve 26, and the gas pipe 5 in this order. It flows into the indoor unit 3 through the unit 35. The refrigerant that has flowed into the indoor unit 3 flows through the indoor unit gas pipe 69 and is split at the connection point G into the first gas branch pipe 69a and the second gas branch pipe 69b.

第１ガス分管６９ａに分流した冷媒は第１室内膨張弁３２ａで減圧されて第１室内熱交換器３１ａに流入する。第１室内熱交換器３１ａに流入した冷媒は、第１送風ファン３３ａの回転により第１空気通路３０１に流入した空気と熱交換を行って凝縮する。一方、第２ガス分管６９ｂに分流した冷媒は第２室内膨張弁３２ｂで減圧されて第２室内熱交換器３１ｂに流入する。第２室内熱交換器３１ｂに流入した冷媒は、第２送風ファン３３ｂの回転により第２空気通路３０２に流入した空気と熱交換を行って凝縮する。このように、第１室内熱交換器３１ａと第２室内熱交換器３１ｂが凝縮器として機能し、第１室内熱交換器３１ａで冷媒と熱交換を行った空気が第１吹出口３ｆから、第２室内熱交換器３１ｂで冷媒と熱交換を行った空気が第２吹出口３ｇから、それぞれ室内に吹き出されることによって、室内機３が設置された部屋の暖房が行われる。 The refrigerant branched into the first gas distribution pipe 69a is decompressed by the first indoor expansion valve 32a and flows into the first indoor heat exchanger 31a. The refrigerant flowing into the first indoor heat exchanger 31a is condensed by exchanging heat with the air flowing into the first air passage 301 by the rotation of the first blower fan 33a. On the other hand, the refrigerant branched into the second gas distribution pipe 69b is decompressed by the second indoor expansion valve 32b and flows into the second indoor heat exchanger 31b. The refrigerant flowing into the second indoor heat exchanger 31b performs heat exchange with the air flowing into the second air passage 302 by the rotation of the second blower fan 33b and condenses. Thus, the 1st indoor heat exchanger 31a and the 2nd indoor heat exchanger 31b function as a condenser, and the air which exchanged heat with the refrigerant in the 1st indoor heat exchanger 31a is from the 1st blower outlet 3f. The air that has exchanged heat with the refrigerant in the second indoor heat exchanger 31b is blown into the room from the second outlet 3g, whereby the room in which the indoor unit 3 is installed is heated.

第１室内熱交換器３１ａから第１液分管６８ａに流出した冷媒と第２室内熱交換器３１ｂから第２液分管６８ｂに流出した冷媒は、接続点Ｌで合流して室外機液管６８に流入し、液管接続部３４を介して液管４に流出する。 The refrigerant that has flowed out of the first indoor heat exchanger 31a into the first liquid distribution pipe 68a and the refrigerant that has flowed out of the second indoor heat exchanger 31b into the second liquid distribution pipe 68b merge at the connection point L and enter the outdoor unit liquid pipe 68. It flows in and flows out to the liquid pipe 4 through the liquid pipe connecting portion 34.

液管４を流れる冷媒は、閉鎖弁２５を介して室外機２に流入する。室外機２に流入した冷媒は、室外機液管６３を流れ、吐出温度センサ７３で検出した圧縮機２１の吐出温度に応じた開度とされた室外膨張弁２４を通過するときにさらに減圧される。室外機液管６３から室外熱交換器２３に流入した冷媒は、室外ファン２８の回転により室外機２の内部に取り込まれた外気と熱交換を行って蒸発する。室外熱交換器２３から流出した冷媒は、冷媒配管６２、四方弁２２、冷媒配管６５、アキュムレータ２８、吸入管６６の順に流れ、圧縮機２１に吸入されて再び圧縮される。 The refrigerant flowing through the liquid pipe 4 flows into the outdoor unit 2 through the closing valve 25. The refrigerant flowing into the outdoor unit 2 flows through the outdoor unit liquid pipe 63 and is further reduced in pressure when passing through the outdoor expansion valve 24 having an opening degree corresponding to the discharge temperature of the compressor 21 detected by the discharge temperature sensor 73. The The refrigerant flowing into the outdoor heat exchanger 23 from the outdoor unit liquid pipe 63 evaporates by exchanging heat with the outside air taken into the outdoor unit 2 by the rotation of the outdoor fan 28. The refrigerant flowing out of the outdoor heat exchanger 23 flows in the order of the refrigerant pipe 62, the four-way valve 22, the refrigerant pipe 65, the accumulator 28, and the suction pipe 66, and is sucked into the compressor 21 and compressed again.

次に、図１乃至図３を用いて、本発明の空気調和機１で第１吹出口３ｆから吹き出される空気の温度（以降、第１吹出温度と記載する）と第２吹出口３ｇから吹き出される空気の温度（以降、第２吹出温度と記載する）を異ならせる方法と、その効果について説明する。 Next, using FIG. 1 to FIG. 3, the temperature of the air blown from the first outlet 3 f (hereinafter referred to as the first outlet temperature) and the second outlet 3 g in the air conditioner 1 of the present invention. A method of changing the temperature of the air to be blown out (hereinafter referred to as the second blowing temperature) and the effect thereof will be described.

尚、以下の説明では、第１吹出温度と第２吹出温度を異ならせて、空気調和機１の冷房運転時に室内機３から吹き出される冷たい空気が、室内機３が設置された部屋の下方（床付近）に滞留する状態である冷気落ちを防止する場合と、空気調和機１の暖房運転時に室内機３から吹き出される暖かい空気が、室内機３が設置された部屋の上方（天井付近）に滞留する状態である暖気の浮き上がりを防止する場合を例に挙げて説明する。
＜冷房運転時に冷気落ちを防止する場合＞ In the following description, the cold air blown out from the indoor unit 3 during the cooling operation of the air conditioner 1 by changing the first blowing temperature and the second blowing temperature is below the room where the indoor unit 3 is installed. When preventing the cool air falling in the state of staying near the floor, the warm air blown out from the indoor unit 3 during the heating operation of the air conditioner 1 is above the room where the indoor unit 3 is installed (near the ceiling) ) Is described as an example in the case of preventing the warm air from rising.
<To prevent cool air drop during cooling operation>

前述したように、空気調和機１が冷房運転を行うときは、冷媒回路１０を図３に示す実線矢印の方向に冷媒が循環し、第１室内熱交換器３１ａと第２室内熱交換器３１ｂが蒸発器として機能する。このとき、第２室内膨張弁３２ｂの開度を第１室内膨張弁３２ａの開度より小さくする。例えば、第１室内膨張弁３２ａの開度が全開である場合は、第２室内膨張弁３２ｂの開度を全開より１０％程度小さい開度とする。 As described above, when the air conditioner 1 performs the cooling operation, the refrigerant circulates in the refrigerant circuit 10 in the direction of the solid line arrow shown in FIG. 3, and the first indoor heat exchanger 31a and the second indoor heat exchanger 31b. Functions as an evaporator. At this time, the opening degree of the second indoor expansion valve 32b is made smaller than the opening degree of the first indoor expansion valve 32a. For example, when the opening degree of the first indoor expansion valve 32a is fully open, the opening degree of the second indoor expansion valve 32b is set to an opening degree that is about 10% smaller than the full opening degree.

第２室内膨張弁３２ｂの開度を第１室内膨張弁３２ａの開度より小さくすれば、第２室内熱交換器３１ｂを流れる冷媒量が第１室内熱交換器３１ａを流れる冷媒量より少なくなり、第２室内熱交換器３１ｂでの熱交換量も第１室内熱交換器３１ａでの熱交換量より少なくなる。これにより、第２室内熱交換器３１ｂの冷媒出口側での冷媒温度（第２ガス側温度センサ７８ｂで検出できる）は、第１室内熱交換器３１ａの冷媒出口側での冷媒温度（第１ガス側温度センサ７８ａで検出できる）より高くなる。 If the opening degree of the second indoor expansion valve 32b is made smaller than the opening degree of the first indoor expansion valve 32a, the amount of refrigerant flowing through the second indoor heat exchanger 31b becomes smaller than the amount of refrigerant flowing through the first indoor heat exchanger 31a. The amount of heat exchange in the second indoor heat exchanger 31b is also smaller than the amount of heat exchange in the first indoor heat exchanger 31a. As a result, the refrigerant temperature on the refrigerant outlet side of the second indoor heat exchanger 31b (which can be detected by the second gas side temperature sensor 78b) is the refrigerant temperature on the refrigerant outlet side of the first indoor heat exchanger 31a (first It can be detected by the gas side temperature sensor 78a).

以上の結果、第２吹出温度が第１吹出温度より高くなるため、第１吹出口３ｆから吹き出された下降しやすい空気が第２吹出口３ｇから吹き出された上昇しやすい空気によって支えられるので、冷房運転時の冷気落ちを防止できる。
＜暖房運転時に暖気の浮き上がりを防止する場合＞ As a result, since the second blowing temperature becomes higher than the first blowing temperature, the air that tends to descend from the first outlet 3f is supported by the air that tends to rise from the second outlet 3g. It is possible to prevent the cool air from dropping during the cooling operation.
<To prevent warm air from rising during heating operation>

前述したように、空気調和機１が暖房運転を行うときは、冷媒回路１０を図３に示す破線矢印の方向に冷媒が循環し、第１室内熱交換器３１ａと第２室内熱交換器３１ｂが凝縮器として機能する。このとき、第１室内膨張弁３２ａの開度を第２室内膨張弁３２ｂの開度より小さくする。例えば、第２室内膨張弁３２ｂの開度が全開である場合は、第１室内膨張弁３２ａの開度を全開より１０％程度小さい開度とする。 As described above, when the air conditioner 1 performs the heating operation, the refrigerant circulates in the refrigerant circuit 10 in the direction of the broken-line arrow shown in FIG. 3, and the first indoor heat exchanger 31a and the second indoor heat exchanger 31b. Functions as a condenser. At this time, the opening degree of the first indoor expansion valve 32a is made smaller than the opening degree of the second indoor expansion valve 32b. For example, when the opening degree of the second indoor expansion valve 32b is fully open, the opening degree of the first indoor expansion valve 32a is set to an opening degree that is about 10% smaller than the full opening degree.

第１室内膨張弁３２ａの開度を第２室内膨張弁３２ｂの開度より小さくすれば、第１室内熱交換器３１ａを流れる冷媒量が第２室内熱交換器３１ｂを流れる冷媒量より少なくなり、第１室内熱交換器３１ａでの熱交換量も第２室内熱交換器３１ｂでの熱交換量より少なくなる。これにより、第１室内熱交換器３１ａの冷媒出口側での冷媒温度（第１液側温度センサ７７ａで検出できる）は、第２室内熱交換器３１ｂの冷媒出口側での冷媒温度（第２液側温度センサ７７ｂで検出できる）より低くなる。 If the opening degree of the first indoor expansion valve 32a is made smaller than the opening degree of the second indoor expansion valve 32b, the amount of refrigerant flowing through the first indoor heat exchanger 31a becomes smaller than the amount of refrigerant flowing through the second indoor heat exchanger 31b. The amount of heat exchange in the first indoor heat exchanger 31a is also smaller than the amount of heat exchange in the second indoor heat exchanger 31b. Thus, the refrigerant temperature on the refrigerant outlet side of the first indoor heat exchanger 31a (which can be detected by the first liquid side temperature sensor 77a) is the refrigerant temperature (second temperature) on the refrigerant outlet side of the second indoor heat exchanger 31b. It can be detected by the liquid side temperature sensor 77b).

以上の結果、第１吹出温度が第２吹出温度より低くなるため、第２吹出口３ｇから吹き出された上昇しやすい空気が、第１吹出口３ｆから吹き出された下降しやすい空気によって押さえ込まれるので、暖房運転時の暖気の浮き上がりを防止できる。 As a result, since the first blowing temperature is lower than the second blowing temperature, the easily rising air blown from the second blowing outlet 3g is suppressed by the easy falling air blown from the first blowing outlet 3f. , Can prevent the warm air from rising during heating operation.

尚、冷房運転時の冷気落ちや暖房運転時の暖気の浮き上がりを防止する際は、図２に示すように、第１上下風向板３ｆａと第２上下風向板３ｇａが平行であることが望ましい。第１上下風向板３ｆａと第２上下風向板３ｇａが平行でない場合、例えば、第１上下風向板３ｆａが上向き／第２上下風向板３ｇａが下向きとなっていると、各吹出口から吹き出される空気が離れていく方向に向かって流れるので、冷気落ちや暖気の浮き上がりを効果的に防止できない。また、第１上下風向板３ｆａが下向き／第２上下風向板３ｇａが上向きとなっていると、各吹出口から吹き出される空気が混ざって第１吹出温度と第２吹出温度の温度差がなくなるため、やはり冷気落ちや暖気の浮き上がりを効果的に防止できない。 In order to prevent the cool air drop during the cooling operation and the warm air rise during the heating operation, it is desirable that the first vertical wind direction plate 3fa and the second vertical wind direction plate 3ga are parallel as shown in FIG. When the first vertical wind direction plate 3fa and the second vertical wind direction plate 3ga are not parallel, for example, when the first vertical wind direction plate 3fa is upward and the second vertical wind direction plate 3ga is downward, the air is blown out from each outlet. Since the air flows in a direction away from the air, it is not possible to effectively prevent the cool air and the warm air from rising. Further, when the first up-and-down wind direction plate 3fa is directed downward and the second up-and-down wind direction plate 3ga is directed upward, the air blown out from the respective outlets is mixed and the temperature difference between the first blowing temperature and the second blowing temperature is eliminated. For this reason, it is still impossible to effectively prevent the cool air and the warm air from rising.

以上説明した冷気落ち防止や暖気の浮き上がり防止以外でも、第１吹出温度と第２吹出温度を異ならせることで様々な効果が得られる。例えば、冷房運転時に第１室内膨張弁３２ａと第２室内膨張弁３２ｂの開度をそれぞれ調整して第１吹出温度を第２吹出温度より低くし、第２吹出口３ｇより上方に配置される第１吹出口３ｆから吹き出される空気を窓際やドアの近く等の温度が高い領域に送風することで、部屋の温度ムラを軽減することができる。また、部屋に複数の使用者が存在する場合に、第１室内膨張弁３２ａと第２室内膨張弁３２ｂの開度をそれぞれ調整して第１吹出温度を第２吹出温度異ならせることで、各使用者の好みに応じた空調空気を送風することもできる。 Various effects can be obtained by differentiating the first blowing temperature and the second blowing temperature in addition to preventing the cool air drop and the warm air from rising as described above. For example, during the cooling operation, the opening degrees of the first indoor expansion valve 32a and the second indoor expansion valve 32b are respectively adjusted so that the first blowing temperature is lower than the second blowing temperature and disposed above the second blowing outlet 3g. By blowing the air blown out from the first air outlet 3f to a region having a high temperature such as near a window or near a door, the temperature unevenness of the room can be reduced. Further, when there are a plurality of users in the room, the opening degree of each of the first indoor expansion valve 32a and the second indoor expansion valve 32b is adjusted to make the first blowing temperature different from the second blowing temperature. It is also possible to blow conditioned air according to the user's preference.

尚、以上説明した実施形態では、第１吹出温度と第２吹出温度を異ならせるときに、第１室内膨張弁３２ａと第２室内膨張弁３２ｂの開度をそれぞれ調整する場合を説明したが、これに加えて第１送風ファン３３ａと第２送風ファン３３ｂの各々の回転数を変えることで、第１室内熱交換器３１ａへの送風量と第２室内熱交換器３１ｂへの送風量を異ならせてもよい。 In the embodiment described above, the case where the opening degrees of the first indoor expansion valve 32a and the second indoor expansion valve 32b are adjusted when the first blowing temperature and the second blowing temperature are made different has been described. In addition to this, by changing the rotation speed of each of the first blower fan 33a and the second blower fan 33b, the blower amount to the first indoor heat exchanger 31a and the blower amount to the second indoor heat exchanger 31b are different. It may be allowed.

また、第１室内熱交換器３１ａと第２室内熱交換器３１ｂの熱交換容量を同じとしているが、例えば、暖房運転時の暖気の浮き上がりをより強く抑制したい空気調和機である場合は、第２室内熱交換器３１ｂの熱交換容量より大きい熱交換容量を有する第１室内熱交換器３１ａを設ける、というように、目的に応じて第１室内熱交換器３１ａと第２室内熱交換器３１ｂの熱交換容量に差を設けてもよい。このとき、熱交換容量に差に応じて送風ファンの送風能力や室内膨張弁の弁径が異なるものを用いてもよい。 Moreover, although the heat exchange capacity of the first indoor heat exchanger 31a and the second indoor heat exchanger 31b is the same, for example, in the case of an air conditioner that more strongly suppresses the rise of warm air during heating operation, The first indoor heat exchanger 31a and the second indoor heat exchanger 31b are provided according to the purpose, such as providing a first indoor heat exchanger 31a having a heat exchange capacity larger than that of the two indoor heat exchangers 31b. A difference may be provided in the heat exchange capacity. At this time, the air blowing capacity of the blower fan or the valve diameter of the indoor expansion valve may be different depending on the difference in heat exchange capacity.

１空気調和機
２室外機
３室内機
３ａ上面パネル
３ａａ上面吸込口
３ｂ前面パネル
３ｂａ前面吸込口
３ｃ第１ケーシング
３ｄ第２ケーシング
３ｅ第３ケーシング
３ｆ第１吹出口
３ｆａ第１上下風向板
３ｇ第２吹出口
３ｇａ第２上下風向板
３ｊ右側面パネル
３ｋ左側面パネル
２１圧縮機
２２四方弁
２３室外熱交換器
３０室内機本体
３１ａ第１室内熱交換器
３１ｂ第２室内熱交換器
３２ａ第１室内膨張弁
３２ｂ第２室内膨張弁
３３ａ第１送風ファン
３３ｂ第２送風ファン
３０１第１空気通路
３０２第２空気通路 DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Outdoor unit 3 Indoor unit 3a Upper surface panel 3aa Upper surface inlet 3b Front panel 3ba Front inlet 3c 1st casing 3d 2nd casing 3e 3rd casing 3f 1st blower outlet 3fa 1st up-down wind direction board 3g 2nd Air outlet 3ga Second vertical airflow direction plate 3j Right side panel 3k Left side panel 21 Compressor 22 Four-way valve 23 Outdoor heat exchanger 30 Indoor unit body 31a First indoor heat exchanger 31b Second indoor heat exchanger 32a First indoor expansion Valve 32b Second indoor expansion valve 33a First blower fan 33b Second blower fan 301 First air passage 302 Second air passage

Claims

It has an indoor unit and an outdoor unit,
The indoor unit includes a main body housing, a first indoor heat exchanger, a second indoor heat exchanger, a first blower fan, a second blower fan, a first indoor expansion valve, and a second indoor expansion valve. When,
An air conditioner having
The main body housing has a suction port, a first air outlet, a second air outlet, and an air passage that communicates the suction port with the first air outlet and the second air outlet,
The first air outlet and the second air outlet are arranged vertically below the front side of the main body housing, and the first air outlet is located above the second air outlet,
The air passage is partitioned into a first air passage and a second air passage,
The first air passage communicates the suction port and the first outlet, and the first indoor heat exchanger and the first blower fan are disposed,
The second air passage communicates the suction port and the second outlet, and the second indoor heat exchanger and the second blower fan are disposed,
The first indoor expansion valve connected to the first indoor heat exchanger; and the second indoor expansion valve connected to the second indoor heat exchanger;
An air conditioner characterized by that.

The first air outlet is provided with a first vertical airflow direction plate,
A second vertical airflow direction plate is provided at the second air outlet.
The air conditioner according to claim 1.

When the indoor unit performs cooling operation,
The opening degree of the second indoor expansion valve is made smaller than the opening degree of the first indoor expansion valve, and the second blowing temperature, which is the temperature of the air blown out from the second blowing port, is set from the first blowing port. Higher than the first blowing temperature, which is the temperature of the blown air,
The air conditioner according to claim 1 or 2, characterized by the above.

When the indoor unit performs heating operation,
The opening degree of the first indoor expansion valve is made smaller than the opening degree of the second indoor expansion valve, and the second blowing temperature, which is the temperature of the air blown out from the second blowing port, is set from the second blowing port. Lower than the second blowing temperature which is the temperature of the blown air,
The air conditioner according to any one of claims 1 to 3.