JPH07225067A - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JPH07225067A JPH07225067A JP6018521A JP1852194A JPH07225067A JP H07225067 A JPH07225067 A JP H07225067A JP 6018521 A JP6018521 A JP 6018521A JP 1852194 A JP1852194 A JP 1852194A JP H07225067 A JPH07225067 A JP H07225067A
- Authority
- JP
- Japan
- Prior art keywords
- outdoor
- unit
- outdoor unit
- units
- indoor
- 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
- Air Conditioning Control Device (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、室内ユニットから延び
たユニット間配管に、室外ユニットを複数個並列につな
いだ空気調和装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner in which a plurality of outdoor units are connected in parallel to inter-unit piping extending from an indoor unit.
【０００２】[0002]
【従来の技術】特開平４−３２４０７５号公報に示され
た空気調和装置は、「室内ユニットから延びたユニット
間配管に、室外ユニットを複数個並列につなぎ、室内の
負荷に応じて複数個の室外ユニットの運転を制御させ
る」というものである。このような構成によって、室内
の負荷に応じた空気調和装置の容量のシステムアップが
図れるという利点がある。2. Description of the Related Art An air conditioner disclosed in Japanese Unexamined Patent Publication No. 4-324075 discloses that "a plurality of outdoor units are connected in parallel to an inter-unit pipe extending from an indoor unit, and a plurality of outdoor units are connected depending on a load in the room. It controls the operation of the outdoor unit. " With such a configuration, there is an advantage that the capacity of the air conditioner can be increased according to the load in the room.
【０００３】[0003]
【発明が解決しようとする課題】このような構成では、
室外ユニットの除霜運転において、次のような問題点の
あることが判明した。すなわち、除霜運転される室外ユ
ニットの熱交換器には圧縮機から吐出された高温の冷媒
をこの熱交換器へ直接導いた後、この熱交換器から流れ
出た冷媒は四方弁を介して直接この除霜運転中の圧縮機
へ戻される（上記公報の図３参照）。このように、いわ
ゆる「ホットガス除霜方式」を採用しているため、冷媒
の熱容量よりも除霜に必要な熱容量が多い場合には完全
に熱交換器の除霜が行えない（霜残りが生ずる）おそれ
があった。SUMMARY OF THE INVENTION With such a configuration,
In the defrosting operation of the outdoor unit, it has been found that there are the following problems. That is, after the high temperature refrigerant discharged from the compressor is directly guided to the heat exchanger of the outdoor unit that is defrosted, the refrigerant flowing out of this heat exchanger is directly passed through the four-way valve. It is returned to the compressor during this defrosting operation (see FIG. 3 of the above publication). In this way, since the so-called "hot gas defrosting method" is adopted, when the heat capacity required for defrosting is larger than the heat capacity of the refrigerant, the heat exchanger cannot be completely defrosted (frost residue remains). Could occur).
【０００４】又、上述した除霜運転中の室外ユニットに
おいては、冷媒が他の室外ユニットへ流れないようにし
たいわゆる「自己除霜」方式を採用している。このた
め、他の室外ユニットの熱交換器をこの除霜運転に活用
することはできず、除霜運転時に室外ユニットを有効に
利用しているとは言い難かった。そこで、本発明は、こ
の種の空気調和装置において、有効な除霜運転を行わせ
ることを目的としたものである。Further, in the outdoor unit during the defrosting operation described above, a so-called "self defrosting" system is adopted in which the refrigerant is prevented from flowing to other outdoor units. Therefore, the heat exchangers of other outdoor units cannot be used for this defrosting operation, and it is difficult to say that the outdoor unit is effectively used during the defrosting operation. Therefore, the present invention is intended to perform an effective defrosting operation in this type of air conditioner.
【０００５】[0005]
【課題を解決するための手段】この目的を達成するため
に、第１の発明は、除霜運転すべき室外ユニットが生じ
た場合にはこの室外ユニットの外に運転可能な室外ユニ
ットの有無を検出する検出手段と、運転可能な室外ユニ
ットがない場合には除霜運転すべき室外ユニット内で冷
媒を循環させる第１の除霜手段と、運転可能な室外ユニ
ットがある場合には除霜運転すべき室外ユニットからの
冷媒をこの故障していない室外ユニットへ導く第２の除
霜手段とを備えるようにしたものである。In order to achieve this object, the first aspect of the present invention determines whether or not there is an outdoor unit that can be operated outside the outdoor unit when a defrosting operation is to be performed. Detecting means for detecting, first defrosting means for circulating the refrigerant in the outdoor unit to be defrosted when there is no operable outdoor unit, and defrosting operation when there is an operable outdoor unit The second defrosting means for guiding the refrigerant from the outdoor unit to be led to the non-faulty outdoor unit is provided.
【０００６】第２の発明によれば、除霜運転中の室外ユ
ニットからの冷媒をこの室外ユニットと並列につながれ
た他の室外ユニットへ導くようにしたものである。第３
の発明によれば、一方の室外ユニットの除霜運転には、
この一方の室外ユニット内の複数の室外熱交換器を交互
に蒸発器と凝縮器として作用させると共に、他方の室外
ユニットのサービス点検が行えるようにしたものであ
る。According to the second invention, the refrigerant from the outdoor unit during the defrosting operation is guided to another outdoor unit connected in parallel with the outdoor unit. Third
According to the invention, the defrosting operation of one of the outdoor units,
The plurality of outdoor heat exchangers in the one outdoor unit are alternately operated as the evaporator and the condenser, and the service inspection of the other outdoor unit can be performed.
【０００７】[0007]
【作用】第１の発明によれば、運転可能な室外ユニット
の有無に応じて除霜方式を変えて、除霜を効率良く行え
る。第２の発明によれば、除霜運転中の室外ユニットか
らの冷媒は、他の室外ユニットの室外熱交換器へ導か
れ、この室外熱交換器で蒸発される。According to the first aspect of the present invention, the defrosting method can be changed depending on the presence or absence of the operable outdoor unit to efficiently perform defrosting. According to the second aspect of the invention, the refrigerant from the outdoor unit during the defrosting operation is guided to the outdoor heat exchanger of another outdoor unit and evaporated in this outdoor heat exchanger.
【０００８】第３の発明によれば、除霜すべき室外ユニ
ット以外の全ての室外ユニットが運転可能な場合は、こ
の除霜すべき室外ユニットでは、複数の室外熱交換器を
交互に蒸発器、凝縮器として作用させて除霜を行う。According to the third aspect of the invention, when all the outdoor units other than the outdoor unit to be defrosted are operable, a plurality of outdoor heat exchangers are alternately arranged in the outdoor unit to be defrosted. , Defrost by acting as a condenser.
【０００９】[0009]
【実施例】図１において、１は空気調和装置で、複数の
室内ユニット２ａ，２ｂ，２ｃと、複数の室外ユニット
３ａ，３ｂ，３ｃと、これら室内外両ユニット２ａ，２
ｂ，２ｃ，３ａ，３ｂをつなぐユニット間配管４とから
構成されている。ユニット間配管４は、高圧ガス管５
と、低圧ガス管６と、液管７とから構成されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 is an air conditioner, which includes a plurality of indoor units 2a, 2b and 2c, a plurality of outdoor units 3a, 3b and 3c, and both indoor and outdoor units 2a and 2c.
b, 2c, 3a, 3b, and an inter-unit pipe 4 for connecting the units. Inter-unit piping 4 is high-pressure gas pipe 5
And a low pressure gas pipe 6 and a liquid pipe 7.
【００１０】第１の室外ユニット３ａには、圧縮機８ａ
と複数の室外熱交換器９ａ，１０ａとが内蔵されてい
る。そして、圧縮機８ａの吸込管１１ａは低圧ガス管６
に、圧縮機８ａの吐出管１２ａは高圧ガス管５に、夫々
つながれている。この第１の室外ユニット３ａに内蔵さ
れた一方の室外熱交換器９ａの一端は２つに分岐されて
おり、一方は低圧開閉弁１３ａを介して低圧ガス管６
に、他方は高圧開閉弁１４ａを介して高圧ガス管５に夫
々つながれている。更に、この室外熱交換器９ａの他端
は室外電動弁１５ａを介して液管７につながれている。
尚、この第１の室外ユニット３ａに内蔵された他方の室
外熱交換器１０ａも、上述の一方の室外熱交換器９ａと
同様に、低圧開閉弁１６ａ、高圧開閉弁１７ａ、室外電
動弁１８ａを介して、各種の管５，６，７につながれて
いる。The first outdoor unit 3a includes a compressor 8a.
And a plurality of outdoor heat exchangers 9a and 10a are built in. The suction pipe 11a of the compressor 8a is the low-pressure gas pipe 6
In addition, the discharge pipe 12a of the compressor 8a is connected to the high-pressure gas pipe 5, respectively. One end of one outdoor heat exchanger 9a built in the first outdoor unit 3a is branched into two, and one of them is connected to the low pressure gas pipe 6 via the low pressure on-off valve 13a.
The other is connected to the high-pressure gas pipe 5 via the high-pressure on-off valve 14a. Further, the other end of the outdoor heat exchanger 9a is connected to the liquid pipe 7 via the outdoor electric valve 15a.
The other outdoor heat exchanger 10a incorporated in the first outdoor unit 3a also includes the low-pressure on-off valve 16a, the high-pressure on-off valve 17a, and the outdoor electric valve 18a, like the above-described one outdoor heat exchanger 9a. It is connected to various tubes 5, 6, and 7 through.
【００１１】一方、第２、第３の室外ユニット３ｂ，３
ｃにおいては、第１の室外ユニット３ａと略同様な機器
が収納されており、且つ同様な弁１３ｂ〜１８ｂ，１３
ｃ〜１８ｃで各機器がつながれている。５０はこれら室
内外両ユニット２ａ，２ｂ，２ｃ，３ａ，３ｂ，３ｃの
運転を制御する制御器で、室外熱交換器９ａ〜９ｃ，１
０ａ〜１０ｃに設けられたセンサ５１や圧縮機８ａ〜８
ｃの吐出管１２ａ〜１２ｃに設けられた吐出温度センサ
５２からの信号が入力されてこれら室内外両ユニット２
ａ〜２ｃ，３ａ〜３ｃの運転を制御するものである。
又、この制御器５０は、例えば室外ユニット３ａに運転
信号を出力しているにもかかわらず、吐出温度センサ５
２からの信号の変化がない場合は、「この室外ユニット
３ａが故障している」と判断することができる。言い換
えれば、これらセンサ５２と制御器５０とによって「運
転可能な室外ユニットの有無を検出する検出手段」が構
成されていることとなる。On the other hand, the second and third outdoor units 3b, 3
In c, equipment similar to that of the first outdoor unit 3a is housed, and the similar valves 13b to 18b, 13 are provided.
Each device is connected by c to 18c. Reference numeral 50 denotes a controller for controlling the operation of both the indoor and outdoor units 2a, 2b, 2c, 3a, 3b, 3c, and the outdoor heat exchangers 9a-9c, 1
Sensors 51 and compressors 8a to 8 provided in 0a to 10c
The signals from the discharge temperature sensor 52 provided in the discharge pipes 12a to 12c of c are input to both the indoor and outdoor units 2
The operation of a to 2c and 3a to 3c is controlled.
In addition, the controller 50 outputs the operation signal to the outdoor unit 3a, for example, but the discharge temperature sensor 5
If there is no change in the signal from 2, it can be determined that "this outdoor unit 3a is out of order". In other words, the sensor 52 and the controller 50 constitute "a detection unit that detects the presence or absence of an operable outdoor unit".
【００１２】ここで、各室外ユニット３ａ，３ｂ，３ｃ
における圧縮機８ａ，８ｂ，８ｃの大きさ（馬力）や種
類（インバータか定格か）、並びに室外熱交換器９ａ，
１０ａ，９ｂ，１０ｂ，９ｃ，１０ｃの大きさは、本発
明の要旨とは直接関係しないため省略するが、いずれの
ものであっても良いことは言うまでもない。参考に、一
例を図２で示せば、室外ユニットとして「インバータ８
馬力」「インバータ１０馬力」「定格８馬力」「定格１
０馬力」の４種類を用意し、このうちの３台を任意に選
択すれば、１６馬力、１８馬力、２０馬力、２４馬力、
２６馬力、２８馬力、３０馬力の７段階の馬力に対応す
ることができる。Here, each outdoor unit 3a, 3b, 3c
Size (horsepower) and type (inverter or rated) of the compressors 8a, 8b, 8c, and the outdoor heat exchanger 9a,
The sizes of 10a, 9b, 10b, 9c and 10c are omitted because they are not directly related to the gist of the present invention, but it goes without saying that they may be any size. For reference, if an example is shown in FIG. 2, an “inverter 8
"Hp""inverter10hp""rated8hp""rated 1
There are 4 types of "0 horsepower", and if 3 of them are arbitrarily selected, 16 horsepower, 18 horsepower, 20 horsepower, 24 horsepower,
It is possible to cope with 7 stages of horsepower of 26 horsepower, 28 horsepower, and 30 horsepower.
【００１３】図１に戻って、各室内ユニット２ａ，２
ｂ，２ｃには室内熱交換器１９ａ，１９ｂ，１９ｃが内
蔵されており、この室内熱交換器の一端側の冷房管２０
ａ，２０ｂ，２０ｃは冷房開閉弁２１ａ，２１ｂ，２１
ｃを介して低圧ガス管６に、暖房管２２ａ，２２ｂ，２
２ｃは暖房開閉弁２３ａ，２３ｂ，２３ｃを介して高圧
ガス管５に夫々接続されている。又この室内熱交換器１
９ａ，１９ｂ，１９ｃの他端側は室内電動弁２４ａ，２
４ｂ，２４ｃを介して液管７につながれている。Returning to FIG. 1, each indoor unit 2a, 2
The indoor heat exchangers 19a, 19b, and 19c are built in b and 2c, and the cooling pipe 20 on one end side of the indoor heat exchanger is installed.
a, 20b, 20c are cooling on-off valves 21a, 21b, 21
heating pipes 22a, 22b, 2 to the low-pressure gas pipe 6 via c.
2c are connected to the high-pressure gas pipe 5 via heating on-off valves 23a, 23b, 23c, respectively. Also this indoor heat exchanger 1
The other end sides of 9a, 19b and 19c are indoor electric valves 24a and 2
It is connected to the liquid pipe 7 via 4b and 24c.
【００１４】この空気調和装置１は次の４つの運転状態
がある。室内ユニット２ａ，２ｂ，２ｃがいずれも暖
房運転の場合（全暖房運転）、室内ユニット２ａ，２
ｂ，２ｃがいずれも冷房運転の場合（全冷房運転）。
一方の室内ユニット２ａ，２ｂは冷房運転、他方の室内
ユニット２ｃは暖房運転となり、暖房負荷の方が冷房負
荷よりも大きい場合（暖房主体運転）。一方の室内ユ
ニット２ａ，２ｂは冷房運転、他方の室内ユニット２ｃ
は暖房運転となり、冷房負荷の方が暖房負荷よりも大き
い場合（冷房主体運転）。The air conditioner 1 has the following four operating states. When all of the indoor units 2a, 2b, 2c are in heating operation (full heating operation), the indoor units 2a, 2
When both b and 2c are in cooling operation (all cooling operation).
One indoor unit 2a, 2b is in the cooling operation, the other indoor unit 2c is in the heating operation, and the heating load is larger than the cooling load (heating main operation). One indoor unit 2a, 2b is in the cooling operation, the other indoor unit 2c
Is heating operation, and the cooling load is larger than the heating load (cooling main operation).
【００１５】まず室内ユニットがいずれも暖房運転の
場合は、いずれの圧縮機８ａ〜８ｃも運転させると共
に、高圧開閉弁１４ａ〜１４ｃを閉、低圧開閉弁１３ａ
〜１３ｃ並びに暖房開閉弁２３ａ〜２３ｃを開として、
更に室外電動弁１５ａ〜１５ｃ，１８ａ〜１８ｃの弁開
度をほぼ全開状態に設定し室内電動弁の弁開度２４ａ〜
２４ｃをこの室内電動弁２４ａ〜２４ｃが収納された室
内ユニット２ａ，２ｂ，２ｃの冷房負荷に応じて制御さ
せる。これによって圧縮機８ａ〜８ｃから吐出された冷
媒は図１の実線矢印のように流れ室内熱交換器１９ａ，
１９ｂ，１９ｃが凝縮器として、室外熱交換器９ａ〜９
ｃ，１０ａ〜１０ｃが蒸発器として作用し、各室内が暖
房される。この全暖房運転時、暖房負荷が大きい場合
は、いずれの室外ユニット３ａ，３ｂ，３ｃも運転させ
る。そして、暖房負荷の減少に応じてこれら室外ユニッ
ト３ａ〜３ｃの運転を停止させる。このように暖房負荷
に応じてこれら室外ユニット３ａ〜３ｃの運転状態を制
御させる。尚、全冷房運転時は図１の破線矢印のよう
に冷媒が流れるように制御して、室外熱交換器９ａ〜９
ｃ，１０ａ〜１０ｃを凝縮器として、室内熱交換器１９
ａ，１９ｂ，１９ｃを蒸発器として夫々作用させ、各室
内が冷房される。この全冷房運転時も、冷房負荷に応じ
てこれら室外ユニット３ａ〜３ｃの運転状態を制御させ
る。First, when all the indoor units are in the heating operation, all the compressors 8a to 8c are operated, the high pressure on-off valves 14a to 14c are closed, and the low pressure on-off valve 13a.
~ 13c and heating on-off valves 23a-23c are opened,
Further, the valve opening degrees of the outdoor electric valves 15a to 15c and 18a to 18c are set to a substantially fully opened state, and the valve opening degrees 24a to 24a of the indoor electric valve are set.
24c is controlled according to the cooling load of the indoor units 2a, 2b, 2c in which the indoor electric valves 24a to 24c are housed. As a result, the refrigerant discharged from the compressors 8a to 8c flows as shown by the solid arrows in FIG. 1, and the indoor heat exchanger 19a,
The outdoor heat exchangers 9a to 9c are condensers 19b and 19c.
c, 10a to 10c act as an evaporator, and each room is heated. During this heating only operation, when the heating load is large, all the outdoor units 3a, 3b, 3c are operated. Then, the operation of these outdoor units 3a to 3c is stopped according to the decrease in the heating load. In this way, the operating states of these outdoor units 3a to 3c are controlled according to the heating load. During the cooling only operation, the refrigerant is controlled so as to flow as indicated by the broken line arrow in FIG.
Indoor heat exchanger 19 using c, 10a to 10c as condensers
Each of a, 19b, and 19c acts as an evaporator to cool each room. Even during this cooling only operation, the operating states of the outdoor units 3a to 3c are controlled according to the cooling load.
【００１６】ここで、の全暖房運転時において、例え
ば室内ユニット２ａのみを冷房運転させる場合は、暖房
開閉弁２３ａを閉じて冷房開閉弁２１ａを開放する。こ
れによって、室内熱交換器１９ａに液管７からの液冷媒
が室内電動弁２４ａを介してこの室内熱交換器１９ａに
流れ込む。そして、この室内熱交換器１９ａのみを蒸発
器として作用させ、室内ユニット２ａの冷房運転を行う
（の「暖房主体運転」）。一方、の全冷房運転時に
おいて、例えば室内ユニット２ａのみを暖房運転させる
場合は、冷房開閉弁２１ａを閉じて暖房開閉弁２３ａを
開放する。これによって、室内熱交換器１９ａに高圧ガ
ス管５からの高温冷媒が暖房用開閉弁２３ａを介して室
内熱交換器１９ａに流れ込む。そして、この室内熱交換
器１９ａのみを凝縮器として作用させ、室内ユニットの
暖房運転を行う（の「冷房主体運転」）。In the heating only operation, for example, when only the indoor unit 2a is to be cooled, the heating on / off valve 23a is closed and the cooling on / off valve 21a is opened. As a result, the liquid refrigerant from the liquid pipe 7 flows into the indoor heat exchanger 19a via the indoor electric valve 24a. Then, only this indoor heat exchanger 19a is caused to act as an evaporator to perform the cooling operation of the indoor unit 2a ("heating-main operation"). On the other hand, during the cooling only operation, for example, when only the indoor unit 2a is to be heated, the cooling opening / closing valve 21a is closed and the heating opening / closing valve 23a is opened. As a result, the high temperature refrigerant from the high pressure gas pipe 5 flows into the indoor heat exchanger 19a through the heating on-off valve 23a and into the indoor heat exchanger 19a. Then, only this indoor heat exchanger 19a is caused to act as a condenser to perform the heating operation of the indoor unit ("cooling-main operation").
【００１７】本発明は、例えば上述したの全暖房運転
時や、の暖房主体運転時において、室外ユニット３ａ
〜３ｃの熱交換器９ａ〜９ｃ，１０ａ〜１０ｃに霜が付
着して、この室外ユニット３ａ〜３ｃの除霜運転を行う
場合についてのものである。まず、図３において、この
の全暖房運転時やの暖房主体運転時において、セン
サ５１（図１参照）で室外ユニット３ａ〜３ｃの熱交換
器９ａ〜９ｃ，１０ａ〜１０ｃの温度が所定値以下にな
ったか否か、すなわち除霜すべき室外ユニット３ａ〜３
ｃがあるか否かを判断する（ステップＳ1）。ここで除
霜すべき室外ユニットがない場合は、暖房運転を継続す
る（ステップＳ2）。除霜すべき室外ユニットがある場
合はステップＳ3に移行する。ステップＳ3ではこの除霜
すべき室外ユニット以外に運転可能な室外ユニット（除
霜運転中の室外ユニットを除く）があるか否かを判断す
る。この判断の一例を示すと次のとおりである。制御器
５０（図１参照）から室外ユニット３ａ〜３ｃへ運転信
号を出力しているにもかかわらず、吐出温度センサ５１
で検出される値が上昇しない場合は、室外ユニット３ａ
〜３ｃが故障している等と考えて、運転可能な室外ユニ
ットがないと判断する。運転可能な室外ユニットがない
場合は、「方式Ａ」による除霜運転を行って、その除霜
運転終了後は暖房運転を再開する（ステップＳ4〜ステ
ップＳ6）。According to the present invention, the outdoor unit 3a is used, for example, during the above-described heating only operation or during the heating main operation.
˜3c heat exchangers 9a to 9c, 10a to 10c are adhered with frost to perform the defrosting operation of the outdoor units 3a to 3c. First, in FIG. 3, the temperature of the heat exchangers 9a to 9c, 10a to 10c of the outdoor units 3a to 3c is below a predetermined value by the sensor 51 (see FIG. 1) during the heating only operation or the heating main operation. Or not, that is, the outdoor units 3a to 3 to be defrosted.
It is determined whether or not there is c (step S 1 ). If there is no outdoor unit to be defrosted here, the heating operation is continued (step S 2 ). If there is an outdoor unit to be defrosted, the process proceeds to step S 3 . In step S 3 determines whether or not there is operable outdoor units (excluding the outdoor unit during defrosting operation) in addition to the outdoor unit to be the defrosting. An example of this determination is as follows. Although the controller 50 (see FIG. 1) outputs an operation signal to the outdoor units 3a to 3c, the discharge temperature sensor 51
If the value detected in step 3 does not rise, the outdoor unit 3a
It is judged that there is no operable outdoor unit because it is considered that ~ 3c is out of order. If there is no operable outdoor unit performs a defrosting operation by "method A", the defrosting operation ends after resume heating operation (Step S 4 ~ Step S 6).
【００１８】一方、運転可能な室外ユニットがある場合
は「方式Ｂ」による除霜運転を行って、その除霜運転終
了後は、暖房運転を再開する（ステップＳ7〜ステップ
Ｓ6）。次に「方式Ａ」の除霜方式について、図４に基
づいて説明する。この「方式Ａ」は、例えばこの除霜す
べき室外ユニット３ｂ以外に運転可能な室外ユニットが
ないということであるから、この除霜すべき室外ユニッ
ト３ｂ内で除霜を行い、この間、室内ユニットの送風機
（図示せず）の運転は一時的に中止される。すなわち、
まず、高圧開閉弁１７ｂと低圧開閉弁１３ｂと室外電動
弁１８ｂを開放し、高圧開閉弁１４ｂと低圧開閉弁１６
ｂを閉鎖すると共に、室外電動弁１５ｂの開度を所定値
に設定し圧縮機８ｂを運転させる。これによって圧縮機
８ｂから吐出された冷媒は実線矢印のように流れて、室
外熱交換器１０ｂが凝縮器として室外熱交換器９ｂが蒸
発器として夫々作用する。従って、まず室外熱交換器１
０ｂの除霜を行う。Meanwhile, by performing a defrosting operation by the "method B" when there is operable outdoor unit, its defrosting operation after completion, to resume the heating operation (step S 7 ~ Step S 6). Next, the "method A" defrosting method will be described with reference to FIG. This "method A" means that there is no operable outdoor unit other than the outdoor unit 3b to be defrosted, so defrosting is performed in the outdoor unit 3b to be defrosted, and during this period, the indoor unit is defrosted. The operation of the blower (not shown) is temporarily stopped. That is,
First, the high pressure opening / closing valve 17b, the low pressure opening / closing valve 13b, and the outdoor electric valve 18b are opened, and the high pressure opening / closing valve 14b and the low pressure opening / closing valve 16 are opened.
While closing b, the opening degree of the outdoor electric valve 15b is set to a predetermined value and the compressor 8b is operated. As a result, the refrigerant discharged from the compressor 8b flows as indicated by the solid arrow, and the outdoor heat exchanger 10b functions as a condenser and the outdoor heat exchanger 9b functions as an evaporator. Therefore, first, the outdoor heat exchanger 1
Defrost 0b.
【００１９】この室外熱交換器１０ｂの除霜が終了した
ら、今後室外熱交換器９ｂの除霜を行う。すなわち、高
圧開閉弁１４ｂと低圧開閉弁１６ｂと室外電動弁１５ｂ
を開放し、低圧開閉弁１３ｂと高圧開閉弁１７ｂを閉鎖
すると共に、室外電動弁１８ｂの開度を所定値に設定
し、圧縮機８ｂの運転を継続させる。これによって圧縮
機８ｂから吐出された冷媒は破線矢印のように流れて、
室外熱交換器９ｂが凝縮器として室外熱交換器１０ｂが
蒸発器として夫々作用する。従って、今度は室外熱交換
器９ｂの除霜を行う。この除霜運転中、室外ユニット３
ｂの送風機の運転は停止されている。After the defrosting of the outdoor heat exchanger 10b is completed, the outdoor heat exchanger 9b is defrosted in the future. That is, the high pressure open / close valve 14b, the low pressure open / close valve 16b, and the outdoor electric valve 15b.
Is opened, the low pressure on-off valve 13b and the high pressure on-off valve 17b are closed, the opening degree of the outdoor electric valve 18b is set to a predetermined value, and the operation of the compressor 8b is continued. As a result, the refrigerant discharged from the compressor 8b flows as shown by the broken line arrow,
The outdoor heat exchanger 9b functions as a condenser, and the outdoor heat exchanger 10b functions as an evaporator. Therefore, this time, the outdoor heat exchanger 9b is defrosted. During this defrosting operation, the outdoor unit 3
The operation of the blower b is stopped.
【００２０】このように、除霜すべき室外ユニット３ｂ
しか運転可能な室外ユニットがない場合（室外ユニット
が１台しかない場合も含む）は、この室外ユニット３ｂ
内の複数の室外熱交換器９ｂ，１０ｂを交互に蒸発器と
凝縮器として作用させることによって、これら室外熱交
換器９ｂ，１０ｂに付着した霜を溶かす。尚、説明は省
略するが、室外ユニット３ａ，３ｃを個別に除霜させる
場合も上述した室外ユニット３ｂの除霜状態で示すよう
な冷媒の流れとすれば良いことは言うまでもない。In this way, the outdoor unit 3b to be defrosted
If there is no outdoor unit that can operate only (including the case where there is only one outdoor unit), this outdoor unit 3b
The frost adhering to the outdoor heat exchangers 9b and 10b is melted by alternately operating the plurality of outdoor heat exchangers 9b and 10b inside as an evaporator and a condenser. Although description is omitted, it goes without saying that when the outdoor units 3a and 3c are individually defrosted, the refrigerant flow as shown in the defrosting state of the outdoor unit 3b may be used.
【００２１】次に「方式Ｂ」の除霜方式について図５に
基づいて説明する。この「方式Ａ」は、例えばこの除霜
すべき室外ユニット３ｂ以外に運転可能な室外ユニット
３ｃがあるということであるから、この除霜すべき室外
ユニット３ｂから運転可能な室外ユニット３ａに冷媒を
流してこの室外ユニット３ｂの除霜を行うというもので
ある。この間、室外ユニット２ａの送風機（図示せず）
の運転は一時的に中止される。すなわち、除霜される室
外ユニット３ｂにおいて、高圧開閉弁１４ｂ，１７ｂ並
びに室外電動弁１５ｂ，１８ｂを開放し、低圧開閉弁１
３ｂ，１６ｂを閉じる。一方室外ユニット３ｃにおいて
は、高圧開閉弁１４ｃ，１７ｃを閉じ、低圧開閉弁１３
ｃ，１６ｃを開放すると共に、室外電動弁１５ｃ，１８
ｃの開度を所定値に設定し、圧縮機８ｂを運転させる。
これによって、圧縮機８ｂから吐出された冷媒は実線矢
印のように流れて２つの室外熱交換器８ｂ，１０ｂが同
時に凝縮器として、２つの室外熱交換器９ｃ，１０ｃが
同時に蒸発器として夫々作用する。従って、室外ユニッ
ト３ｂ内の２つの室外熱交換器８ｂ，１０ｂが同時に除
霜される。尚、この「方式Ｂ」による除霜運転中、圧縮
機８ｃは停止されているものの、例えば室内ユニット２
ａの暖房運転を行いたい場合はこの圧縮機８ｃも運転さ
せることによって、この圧縮機８ｃから吐出された冷媒
を破線矢印のように流すことによって、実線矢印で示し
たような除霜の流れと、破線矢印で示したような暖房の
流れとが並流される。従って、室外ユニット３ｂの除霜
を行いながら、室内ユニット２ａでは暖房運転が行え
る。ここで除霜すべき室外ユニット３ｂの送風機（図示
せず）の運転は停止させ、室外ユニット３ｃの送風機
（図示せず）は運転させることによって、この室外ユニ
ット３ｃの室外熱交換器９ｃ，１０ｃにおける蒸発作用
を促進させる。これによって、除霜運転の効率の向上を
図ることができる。又、この除霜運転中に室内ユニット
２ａを冷房運転させる場合は、液管７からの液冷媒を一
点鎖線矢印のように流す。これによって、室内熱交換器
１９ａが蒸発器として作用し室内ユニット２ａが冷房運
転となる。Next, the "method B" defrosting method will be described with reference to FIG. This "method A" means that there is an operable outdoor unit 3c other than the outdoor unit 3b to be defrosted, so that the refrigerant is transferred from the outdoor unit 3b to be defrosted to the operable outdoor unit 3a. This is done by defrosting the outdoor unit 3b. During this time, the blower of the outdoor unit 2a (not shown)
Is temporarily stopped. That is, in the outdoor unit 3b to be defrosted, the high pressure on-off valves 14b and 17b and the outdoor motor operated valves 15b and 18b are opened, and the low pressure on-off valve 1 is opened.
Close 3b and 16b. On the other hand, in the outdoor unit 3c, the high pressure on-off valves 14c and 17c are closed and the low pressure on-off valve 13 is closed.
c, 16c is opened, and the outdoor electric valves 15c, 18 are opened.
The opening degree of c is set to a predetermined value and the compressor 8b is operated.
As a result, the refrigerant discharged from the compressor 8b flows as indicated by the solid arrow, and the two outdoor heat exchangers 8b and 10b simultaneously act as condensers and the two outdoor heat exchangers 9c and 10c simultaneously act as evaporators. To do. Therefore, the two outdoor heat exchangers 8b and 10b in the outdoor unit 3b are simultaneously defrosted. Although the compressor 8c is stopped during the defrosting operation by the "method B", for example, the indoor unit 2
When it is desired to perform the heating operation of a, by operating this compressor 8c as well, the refrigerant discharged from this compressor 8c is caused to flow as indicated by the broken line arrow, so that the defrosting flow as shown by the solid line arrow , And the heating flow as indicated by the dashed arrow flow in parallel. Therefore, the heating operation can be performed in the indoor unit 2a while defrosting the outdoor unit 3b. Here, by stopping the operation of the blower (not shown) of the outdoor unit 3b to be defrosted and operating the blower (not shown) of the outdoor unit 3c, the outdoor heat exchangers 9c, 10c of the outdoor unit 3c are operated. Promote the evaporation effect in. Thereby, the efficiency of the defrosting operation can be improved. Further, when the indoor unit 2a is cooled during the defrosting operation, the liquid refrigerant from the liquid pipe 7 is flowed as indicated by the one-dot chain line arrow. As a result, the indoor heat exchanger 19a acts as an evaporator, and the indoor unit 2a is in cooling operation.
【００２２】尚、上述した例は、室外ユニット３ｂを除
霜させる場合について述べたが、室外ユニット３ｃや室
外ユニット３ａを除霜させる場合も、上述した室外ユニ
ット３ｂの除霜と同様な冷媒の流れとすれば良いことは
言うまでもない。この「方式Ａ」「方式Ｂ」いずれの除
霜方式においても、蒸発器が存在しないいわゆる「ホッ
トガス除霜」ではないため、熱容量不足による霜残りが
生じるおそれはない。In the above example, the case where the outdoor unit 3b is defrosted has been described. However, when defrosting the outdoor unit 3c and the outdoor unit 3a, the same refrigerant as the above-mentioned defrosting of the outdoor unit 3b is used. It goes without saying that a flow is acceptable. Since neither of the "method A" and the "method B" defrosting methods is so-called "hot gas defrosting" in which an evaporator does not exist, there is no possibility of frost residue due to insufficient heat capacity.
【００２３】このように、本発明の空気調和装置におい
ては、２つの除霜方式（「方式Ａ」「方式Ｂ」）を備
え、除霜すべき室外ユニットが生じた場合にはまず他の
室外ユニットが運転可能か否かを判断し、運転可能な室
外ユニットがあれば、その室外ユニットを利用して室外
ユニットの除霜を一気に行い（「方式Ｂ」）、運転可能
な室外ユニットがない場合は、室外ユニット内で除霜を
行う（「方式Ａ」）ようにしたものである。As described above, the air conditioner of the present invention is provided with two defrosting methods ("method A" and "method B"), and when an outdoor unit to be defrosted is generated, the other outdoor first. If there is an outdoor unit that can be operated by judging whether the unit is operable, defrosting the outdoor unit at once using the outdoor unit (“method B”) and there is no operable outdoor unit Is for defrosting in the outdoor unit (“method A”).
【００２４】[0024]
【発明の効果】以上述べたように、第１の発明によれば
除霜すべき室外ユニットが生じた場合には、運転可能な
室外ユニットの有無に応じて除霜方式が選択されるの
で、空気調和装置の状況にフィットした効率の良い除霜
を行うことができる。第２の発明によれば、除霜運転中
の室外ユニットからの冷媒は他の室外ユニットの室外熱
交換器へ導くようにしたので、この他の室外ユニットの
室外熱交換器を蒸発器として作用させて室外ユニットの
除霜を速やかに行うことができる。As described above, according to the first aspect of the invention, when the outdoor unit to be defrosted is generated, the defrosting method is selected depending on the presence or absence of the operable outdoor unit. Efficient defrosting that fits the condition of the air conditioner can be performed. According to the second invention, the refrigerant from the outdoor unit during the defrosting operation is guided to the outdoor heat exchanger of the other outdoor unit, so that the outdoor heat exchanger of the other outdoor unit acts as an evaporator. As a result, the outdoor unit can be quickly defrosted.
【００２５】第３の発明によれば、除霜すべき室外ユニ
ット以外の全ての室外ユニットが運転不可能な場合は、
この除霜すべき室外ユニット内の複数の熱交換器を交互
に凝縮器、蒸発器として作用させるので、この室外ユニ
ットの霜残りが発生するおそれを少なくできる。According to the third invention, when all the outdoor units other than the outdoor unit to be defrosted cannot be operated,
Since the plurality of heat exchangers in the outdoor unit to be defrosted alternately act as the condenser and the evaporator, it is possible to reduce the possibility that frost residue will occur in the outdoor unit.
【図１】本発明の空気調和装置の冷媒回路図である。FIG. 1 is a refrigerant circuit diagram of an air conditioner of the present invention.
【図２】図１に示した室外ユニットの組み合せパターン
を示す説明図である。FIG. 2 is an explanatory diagram showing a combination pattern of the outdoor unit shown in FIG.
【図３】図１に示した空気調和装置の除霜制御のフロー
チャートである。FIG. 3 is a flowchart of defrost control of the air conditioner shown in FIG.
【図４】図３で示した「方式Ａ」の除霜時の冷媒の流れ
を示す要部冷媒回路図である。4 is a principal part refrigerant circuit diagram showing a refrigerant flow at the time of defrosting of "method A" shown in FIG. 3. FIG.
【図５】図３に示した「方式Ｂ」の除霜時の冷媒の流れ
を示す要部冷媒回路図である。5 is a principal part refrigerant circuit diagram showing a refrigerant flow at the time of defrosting of "method B" shown in FIG. 3. FIG.
２ａ〜２ｃ 室内ユニット ３ａ〜３ｃ 室外ユニット ４ ユニット間配管 ８ａ〜８ｃ 圧縮機 ９ａ〜９ｃ，１０ａ〜１０ｃ 室外ユニット ５０ 制御器 ５２ センサ 2a to 2c indoor unit 3a to 3c outdoor unit 4 piping between units 8a to 8c compressors 9a to 9c, 10a to 10c outdoor unit 50 controller 52 sensor
Claims (3)
に、圧縮機と室外熱交換器とを内蔵した室外ユニットを
複数個並列につなぎ、室内の空調負荷に応じてこれら複
数個の室外ユニットの運転を制御させる空気調和装置に
おいて、除霜運転すべき室外ユニットが生じた場合には
この室外ユニットの外に運転可能な室外ユニットの有無
を検出する検出手段と、運転可能な室外ユニットがない
場合には前記除霜運転すべき室外ユニット内で冷媒を循
環させる第１の除霜手段と、運転可能な室外ユニットが
ある場合には前記除霜運転すべき室外ユニットからの冷
媒をこの運転可能な室外ユニットへ導く第２の除霜手段
とを備えたことを特徴とする空気調和装置。1. An inter-unit pipe extending from an indoor unit is connected with a plurality of outdoor units having a compressor and an outdoor heat exchanger in parallel, and the plurality of outdoor units are operated according to an indoor air conditioning load. In the air conditioner for controlling the above, when an outdoor unit to be defrosted is generated, a detection means for detecting the presence or absence of a drivable outdoor unit outside this outdoor unit, and the case where there is no drivable outdoor unit Is a first defrosting means for circulating a refrigerant in the outdoor unit to be defrosted, and if there is an operable outdoor unit, the refrigerant from the outdoor unit to be defrosted is supplied to the operable outdoor unit. An air conditioner comprising: a second defrosting unit that guides the unit.
に、圧縮機と室外熱交換器とを内蔵した室外ユニットを
複数個並列につなぎ、室内の負荷に応じて複数個の室外
ユニットの運転を制御させる空気調和装置において、除
霜運転中の室外ユニットからの冷媒を他の室外ユニット
へ導くことを特徴とする空気調和装置。2. A plurality of outdoor units having a compressor and an outdoor heat exchanger are connected in parallel to an inter-unit pipe extending from the indoor unit, and operation of the plurality of outdoor units is controlled according to indoor load. In the air conditioner, the air conditioner is characterized in that the refrigerant from the outdoor unit during the defrosting operation is guided to another outdoor unit.
に、複数個の室外ユニットを並列につなぎ、且つこれら
室外ユニットには、圧縮機と、並列に配置された室外熱
交換器とを内蔵させて、室内の負荷に応じて複数個の室
外ユニットの運転を制御させる空気調和装置において、
一方の室外ユニットの除霜運転には、この一方の室外ユ
ニット内の複数の室外熱交換器を交互に蒸発器と凝縮器
として作用させると共に、他方の室外ユニットのサービ
ス点検が行えることを特徴とする空気調和装置。3. A plurality of outdoor units are connected in parallel to an inter-unit pipe extending from the indoor unit, and a compressor and an outdoor heat exchanger arranged in parallel are built in these outdoor units. In an air conditioner that controls the operation of a plurality of outdoor units according to the indoor load,
In the defrosting operation of one outdoor unit, the plurality of outdoor heat exchangers in the one outdoor unit are alternately operated as the evaporator and the condenser, and the service inspection of the other outdoor unit can be performed. Air conditioner that does.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06018521A JP3123873B2 (en) | 1994-02-15 | 1994-02-15 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06018521A JP3123873B2 (en) | 1994-02-15 | 1994-02-15 | Air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07225067A true JPH07225067A (en) | 1995-08-22 |
| JP3123873B2 JP3123873B2 (en) | 2001-01-15 |
Family
ID=11973940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06018521A Expired - Fee Related JP3123873B2 (en) | 1994-02-15 | 1994-02-15 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3123873B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007271094A (en) * | 2006-03-30 | 2007-10-18 | Mitsubishi Electric Corp | Air conditioner |
| WO2008084657A1 (en) * | 2006-12-25 | 2008-07-17 | Daikin Industries, Ltd. | Air conditioning apparatus |
| JP2009250495A (en) * | 2008-04-04 | 2009-10-29 | Mitsubishi Electric Corp | Air conditioner |
| WO2015122171A1 (en) * | 2014-02-14 | 2015-08-20 | パナソニックＩｐマネジメント株式会社 | Air conditioning device |
-
1994
- 1994-02-15 JP JP06018521A patent/JP3123873B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007271094A (en) * | 2006-03-30 | 2007-10-18 | Mitsubishi Electric Corp | Air conditioner |
| WO2008084657A1 (en) * | 2006-12-25 | 2008-07-17 | Daikin Industries, Ltd. | Air conditioning apparatus |
| JP2009250495A (en) * | 2008-04-04 | 2009-10-29 | Mitsubishi Electric Corp | Air conditioner |
| WO2015122171A1 (en) * | 2014-02-14 | 2015-08-20 | パナソニックＩｐマネジメント株式会社 | Air conditioning device |
| JPWO2015122171A1 (en) * | 2014-02-14 | 2017-03-30 | パナソニックＩｐマネジメント株式会社 | Air conditioner |
| DE112015000790B4 (en) | 2014-02-14 | 2022-10-20 | Panasonic Intellectual Property Management Co., Ltd. | air conditioning device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3123873B2 (en) | 2001-01-15 |
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