JPH05346270A - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JPH05346270A JPH05346270A JP15505092A JP15505092A JPH05346270A JP H05346270 A JPH05346270 A JP H05346270A JP 15505092 A JP15505092 A JP 15505092A JP 15505092 A JP15505092 A JP 15505092A JP H05346270 A JPH05346270 A JP H05346270A
- Authority
- JP
- Japan
- Prior art keywords
- outdoor heat
- frost
- heat exchangers
- outdoor
- air conditioner
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Other Air-Conditioning Systems (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、冷媒回路を改良した空
気調和機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner having an improved refrigerant circuit.
【０００２】[0002]
【従来の技術】従来の空気調和機の１例を、図２によっ
て説明する。2. Description of the Related Art One example of a conventional air conditioner will be described with reference to FIG.
【０００３】２は圧縮機で、三方弁３を介して室内熱交
換器４に接続されている。同室内熱交換器４は、冷房絞
り機構１３を介して過冷却コイル６に接続され、同過冷
却コイル６は、並列に設けられた暖房絞り機構７と逆止
弁１２を介してディストリビュータ８に接続され、同デ
ィストリビュータ８は上下方向に２個積み重ねられた室
外熱交換器９，９ａに接続され、同室外熱交換器９，９
ａに合流した管路を介して前記三方弁３に接続されてい
て、下方の熱交換９の下部に前記過冷却コイル６が連設
されている。前記三方弁３は前記圧縮機２に接続された
アキュームレータ１１に接続されている。A compressor 2 is connected to an indoor heat exchanger 4 via a three-way valve 3. The indoor heat exchanger 4 is connected to a supercooling coil 6 via a cooling expansion mechanism 13, and the subcooling coil 6 is connected to a distributor 8 via a heating expansion mechanism 7 and a check valve 12 provided in parallel. The same distributor 8 is connected to the outdoor heat exchangers 9 and 9a that are vertically stacked, and the outdoor heat exchangers 9 and 9 are connected to each other.
The supercooling coil 6 is connected to the three-way valve 3 via a pipe that joins a and is connected to the lower part of the lower heat exchange 9. The three-way valve 3 is connected to an accumulator 11 connected to the compressor 2.
【０００４】また、５は前記室内熱交換器４へ送風する
室内ファン、１０は前記室外熱交換器９，９ａへ送風す
る室外ファンである。Reference numeral 5 is an indoor fan for blowing air to the indoor heat exchanger 4, and 10 is an outdoor fan for blowing air to the outdoor heat exchangers 9 and 9a.
【０００５】この空気調和機の暖房運転時には、圧縮機
２から吐出された高温のガス冷媒は、四方弁３から室内
熱交換器４に流れ、ここで室内ファン５で送られた風に
よって凝縮液化し、冷房絞り機構１３を経て過冷却コイ
ル６を通過する際に更に過冷却された液となり、暖房絞
り機構７で絞られて断熱膨張し、ディストリビュータ８
で分岐されて室外熱交換器９，９ａで蒸発する。この蒸
発した冷媒ガスは四方弁３、アキュームレータ１１を経
て圧縮機２へ戻る。During the heating operation of this air conditioner, the high-temperature gas refrigerant discharged from the compressor 2 flows from the four-way valve 3 to the indoor heat exchanger 4, where it is condensed and liquefied by the air sent by the indoor fan 5. Then, when it passes through the supercooling coil 6 through the cooling throttle mechanism 13, it becomes supercooled liquid, which is throttled by the heating throttle mechanism 7 and adiabatically expanded.
Is branched off and evaporated in the outdoor heat exchangers 9 and 9a. The evaporated refrigerant gas returns to the compressor 2 via the four-way valve 3 and the accumulator 11.
【０００６】暖房時において、外気温度が低い場合や暖
房過負荷時に室外ファン１０がオフになった場合等室外
熱交換器９，９ａへの負荷が小さくなると、室外熱交換
器９，９ａに着霜が始まる。During heating, when the outdoor air temperature is low, or when the outdoor fan 10 is turned off during overloading of the heating, the outdoor heat exchangers 9 and 9a reach the outdoor heat exchangers 9 and 9a when the load on the outdoor heat exchangers 9 and 9a decreases. Frost begins.
【０００７】この着霜が或る程度進行すると、霜を溶か
すために、空気調和機を冷房運転に切換えデフロスト運
転したり、室外ファン１０をオンにしたりする。霜が溶
かされると、空気調和機は再び暖房運転に戻る。なお室
外ファン１０は、暖房過負荷時図示しない高圧スイッチ
によってオン−オフするように操作される。When the frost has progressed to a certain extent, the air conditioner is switched to the cooling operation to perform the defrost operation or the outdoor fan 10 is turned on in order to melt the frost. When the frost is melted, the air conditioner returns to heating operation. The outdoor fan 10 is operated so as to be turned on and off by a high-voltage switch (not shown) during heating overload.
【０００８】[0008]
【発明が解決しようとする課題】大型空調機において
は、図２に示すように、室外熱交換器を上下方向に積み
重ねて複数使用することが多い。この装置では、暖房運
転における低外気温時や過負荷時の室外ファン１０のオ
フ時、室外熱交換器９，９ａは着霜を始める。これを溶
かすために、前記のように、デフロスト運転や室外ファ
ン１０をオン（実際には着霜に関係なく暖房過負荷時に
高圧スイッチによってファン１０がオン−オフされる
が、結果的にオフ時に着霜、オン時に霜を溶かすことに
なる）してこの霜を溶かすが、室外熱交換器の最下段は
冷媒の排出が悪く、また、熱の伝達も悪いために霜を溶
け残すことが多くこれが氷となって成長し、熱交換器の
破損や能力低下を発生させる結果となっていた。In a large-scale air conditioner, as shown in FIG. 2, a plurality of outdoor heat exchangers are vertically stacked and used in many cases. In this device, the outdoor heat exchangers 9 and 9a start frosting when the outdoor fan 10 is turned off at low outdoor temperature or overload in heating operation. In order to melt this, as described above, the defrost operation and the outdoor fan 10 are turned on (actually, the fan 10 is turned on and off by the high-voltage switch at the time of heating overload regardless of frost formation, but as a result, at the time of off. The frost is melted when frosted and turned on), but this frost is melted, but the bottom of the outdoor heat exchanger has poor refrigerant discharge and poor heat transfer, often leaving frost unmelted. This became ice and grew, resulting in damage to the heat exchanger and deterioration of its performance.
【０００９】本発明は、以上の問題点を解決することが
できる空気調和機を提供しようとするものである。The present invention is intended to provide an air conditioner capable of solving the above problems.
【００１０】[0010]
【課題を解決するための手段】本発明は、室外熱交換器
を上下方向に複数用いた空気調和機において、前記各室
外熱交換器の最下段に過冷却コイルを有する冷媒回路を
備えたことを特徴とする。According to the present invention, in an air conditioner using a plurality of outdoor heat exchangers vertically, a refrigerant circuit having a supercooling coil is provided at the lowest stage of each outdoor heat exchanger. Is characterized by.
【００１１】[0011]
【作用】本発明には前記手段を具えているため、暖房運
転時には各熱交換器の最下段に設けられた過冷却コイル
がコンデンサとなって高圧の液が流れるために、常に温
度は高くなる。従って、室外熱交換器に着霜が生ずる場
合でも、この過冷却コイルの部分には着霜が生ずること
がなく、デフロスト運転や室外ファンのオン−オフによ
る室外熱交換器の着霜を解かす際に霜の溶け残しがなく
なる。Since the present invention has the above-mentioned means, the supercooling coil provided at the lowest stage of each heat exchanger serves as a condenser during the heating operation and a high-pressure liquid flows, so that the temperature is always high. . Therefore, even if frost forms on the outdoor heat exchanger, no frost forms on the subcooling coil portion, and defrost operation on the outdoor heat exchanger due to defrost operation or on / off of the outdoor fan is eliminated. There is no frost left behind.
【００１２】[0012]
【実施例】本発明の一実施例を、図１によって説明す
る。本実施例は、図２に示される空気調和機と同様に室
外熱交換器を２個上下に重ねたものであり、図１におい
て対応する部分には図２におけると同一の符号を付し、
以下相違する点について説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. In this embodiment, two outdoor heat exchangers are vertically stacked in the same manner as the air conditioner shown in FIG. 2, and corresponding parts in FIG. 1 are designated by the same reference numerals as in FIG.
The different points will be described below.
【００１３】即ち、本実施例では、上下に重ね合わされ
た室内外熱交換器９，９ａの各々の最下段に、それぞれ
過冷却コイル６，６ａが設けられている。室内熱交換器
４は、冷房絞り機構１３、及び分岐した配管２０，２０
ａを介して過冷却コイル６，６ａに接続され、またこの
過冷却コイル６，６ａは、並列に配置された暖房絞り機
構７，逆止弁１２；暖房絞り機構７ａ，逆止弁１２ａを
介してそれぞれディストリビュータ８，８ａに接続され
ている。これらのディストリビュータ８，８ａは、それ
ぞれ室外熱交換器９，９ａの過冷却コイル６，６ａより
上段の部分に接続されている。That is, in this embodiment, the subcooling coils 6 and 6a are respectively provided at the lowest stage of the indoor and outdoor heat exchangers 9 and 9a which are vertically stacked. The indoor heat exchanger 4 includes the cooling expansion mechanism 13 and the branched pipes 20, 20.
is connected to the subcooling coils 6, 6a via a, and the subcooling coils 6, 6a are connected in parallel via the heating throttle mechanism 7, check valve 12; heating throttle mechanism 7a, check valve 12a. Are respectively connected to distributors 8 and 8a. These distributors 8 and 8a are connected to the portions above the supercooling coils 6 and 6a of the outdoor heat exchangers 9 and 9a, respectively.
【００１４】なお、図中１０，１０ａはそれぞれ室外熱
交換器９，９ａへ送風を行う室外ファンである。また、
図１中実線矢印は暖房運転時における冷媒の流れの方向
を、点線矢印は冷房運転時における冷媒の流れの方向を
示す。In the figure, 10 and 10a are outdoor fans for blowing air to the outdoor heat exchangers 9 and 9a, respectively. Also,
In FIG. 1, solid arrows indicate the direction of refrigerant flow during heating operation, and dotted arrows indicate the direction of refrigerant flow during cooling operation.
【００１５】本実施例において、暖房運転時には、圧縮
機２から吐出された高温高圧のガス冷媒は、四方弁３を
通り、室内熱交換器４で室内ファン５によって送られて
来る風によって凝縮液化して冷房絞り機構１３を通り、
分岐した配管２０，２０ａを経て室外熱交換器９，９′
ａの最下段の過冷却コイル６，６′ａに入って更に過冷
却された液となる。この冷媒の液は、次に暖房絞り機構
７，７′ａで断熱膨張し、ディストリビュータ８，８′
ａで各サーキットに分れ室外熱交換器９，９′ａ内の過
冷却コイル６，６ａより上段の部分で蒸発し、四方弁３
にてアキュームレータ１１に流れ、再び圧縮機２によっ
て吐出される。In the present embodiment, during the heating operation, the high-temperature and high-pressure gas refrigerant discharged from the compressor 2 is condensed and liquefied by the air sent by the indoor fan 5 through the four-way valve 3 and the indoor heat exchanger 4. And then passes through the cooling throttle mechanism 13,
Outdoor heat exchangers 9 and 9'through branched pipes 20 and 20a
The liquid enters the supercooling coils 6 and 6'a in the lowermost stage of a and becomes a supercooled liquid. The liquid of this refrigerant is then adiabatically expanded by the heating throttle mechanism 7, 7'a, and the distributor 8, 8 '
It is divided into each circuit by a and evaporates in the parts above the supercooling coils 6 and 6a in the outdoor heat exchangers 9 and 9'a, and the four-way valve 3
Then, the gas flows to the accumulator 11 and is discharged again by the compressor 2.
【００１６】以上のように、暖房運転時に過冷却コイル
６，６ａを流れる冷媒は、室内熱交換器４で凝縮液化さ
れ冷房絞り機構１３を通った高圧の温度の高い液であ
り、室外熱交換器９，９ａで着霜が生ずる条件の時にお
いても、室外熱交換器９，９ａの最下段の過冷却コイル
６，６ａには着霜が生ずることがない。As described above, the refrigerant flowing through the subcooling coils 6 and 6a during the heating operation is a liquid of high pressure and high temperature that has been condensed and liquefied in the indoor heat exchanger 4 and has passed through the cooling expansion mechanism 13, and the outdoor heat exchange. Even under the condition that frost formation occurs in the containers 9 and 9a, frost formation does not occur in the subcooling coils 6 and 6a in the lowermost stage of the outdoor heat exchangers 9 and 9a.
【００１７】従って、室外熱交換器９，９ａの着霜を溶
かすデフロスト運転や室外ファン１０をオンにした場合
に、霜を溶かすことが困難な室外熱交換器９，９ａの最
下段において霜の溶け残しが発生することがない。Therefore, when the defrost operation for melting the frost of the outdoor heat exchangers 9 and 9a and the outdoor fan 10 are turned on, it is difficult to melt the frost at the bottom of the outdoor heat exchangers 9 and 9a. No unmelted residue will occur.
【００１８】[0018]
【発明の効果】本発明においては、上下方向に複数個設
けられた室外熱交換器の各々の最下段に過冷却コイルを
設けているために、暖房運転時には暖かい冷媒が過冷却
コイルを流れることとなり、室外熱交換器で着霜が進行
する条件の時でもこの部分の氷結の発生を防止すること
ができる。従って、デフロスト運転や室外ファンをオン
することによって霜を溶かす場合、これが困難な室外熱
交換器の最下段に氷結が発生することがなく、霜の溶け
残しを防止することができる。According to the present invention, since the subcooling coil is provided at the lowest stage of each of the outdoor heat exchangers provided in the vertical direction, the warm refrigerant flows through the subcooling coil during the heating operation. Therefore, it is possible to prevent the formation of icing in this portion even under the condition that frost formation proceeds in the outdoor heat exchanger. Therefore, when the frost is melted by the defrost operation or by turning on the outdoor fan, frost is not generated in the lowest stage of the outdoor heat exchanger, which is difficult to do, and it is possible to prevent unmelted frost.
【図１】本発明の一実施例に係る空気調和機の冷媒回路
図である。FIG. 1 is a refrigerant circuit diagram of an air conditioner according to an embodiment of the present invention.
【図２】従来の空気調和機の冷媒回路図である。FIG. 2 is a refrigerant circuit diagram of a conventional air conditioner.
２ 圧縮機 ４ 室内熱交換器 ６，６ａ 過冷却コイル ７，７′ａ 暖房絞り機構 ８，８ａ ディストリビュータ ９，９ａ 室外熱交換器 2 Compressor 4 Indoor heat exchanger 6,6a Supercooling coil 7,7'a Heating throttling mechanism 8,8a Distributor 9,9a Outdoor heat exchanger
Claims (1)
気調和機において、前記各室外熱交換器の最下段に過冷
却コイルを有する冷媒回路を備えたことを特徴とする空
気調和機。1. An air conditioner using a plurality of outdoor heat exchangers in a vertical direction, wherein a refrigerant circuit having a supercooling coil is provided at the lowest stage of each of the outdoor heat exchangers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15505092A JP2966648B2 (en) | 1992-06-15 | 1992-06-15 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15505092A JP2966648B2 (en) | 1992-06-15 | 1992-06-15 | Air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05346270A true JPH05346270A (en) | 1993-12-27 |
| JP2966648B2 JP2966648B2 (en) | 1999-10-25 |
Family
ID=15597580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15505092A Expired - Lifetime JP2966648B2 (en) | 1992-06-15 | 1992-06-15 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2966648B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112240654A (en) * | 2019-07-17 | 2021-01-19 | 日立江森自控空调有限公司 | Heat exchanger, air conditioner, indoor unit, and outdoor unit |
-
1992
- 1992-06-15 JP JP15505092A patent/JP2966648B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112240654A (en) * | 2019-07-17 | 2021-01-19 | 日立江森自控空调有限公司 | Heat exchanger, air conditioner, indoor unit, and outdoor unit |
| JP2021017991A (en) * | 2019-07-17 | 2021-02-15 | 日立ジョンソンコントロールズ空調株式会社 | Heat exchanger, air conditioner, indoor machine and outdoor machine |
| CN112240654B (en) * | 2019-07-17 | 2022-05-06 | 日立江森自控空调有限公司 | Heat exchanger, air conditioner, indoor unit, and outdoor unit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2966648B2 (en) | 1999-10-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19990713 |