JP2989370B2 - Air conditioner - Google Patents

Air conditioner

Info

Publication number
JP2989370B2
JP2989370B2 JP4098537A JP9853792A JP2989370B2 JP 2989370 B2 JP2989370 B2 JP 2989370B2 JP 4098537 A JP4098537 A JP 4098537A JP 9853792 A JP9853792 A JP 9853792A JP 2989370 B2 JP2989370 B2 JP 2989370B2
Authority
JP
Japan
Prior art keywords
outdoor
operating number
operating
indoor units
refrigerant
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.)
Expired - Fee Related
Application number
JP4098537A
Other languages
Japanese (ja)
Other versions
JPH05272793A (en
Inventor
久司 服部
勝敏 北川
正彦 佐々倉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP4098537A priority Critical patent/JP2989370B2/en
Publication of JPH05272793A publication Critical patent/JPH05272793A/en
Application granted granted Critical
Publication of JP2989370B2 publication Critical patent/JP2989370B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は複数台の室外フアンを備
えた室外機に対して複数台の室内機を冷媒配管を介して
並列に接続してなる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 in which a plurality of indoor units are connected in parallel via refrigerant piping to an outdoor unit having a plurality of outdoor fans.

【0002】[0002]

【従来の技術】従来のこの種空気調和機の冷媒回路の1
例が図3に示されている。室外機1に対して複数台(図
には3台)の室内機2A、2B、2Cが冷媒配管3A、3Bを介し
て並列に接続されている。室外機1は圧縮機4、四方弁
5、室外熱交換器6、複数台(図には3台)の室外フア
ン7A、7B、7C、アキュムレ−タ8等を備えている。室内
機2A、2B、2Cはそれぞれ室内熱交換器9A、9B、9C、室内
フアン10A 、10B 、10C 、電子膨張弁11A、11B 、11C
等を備えている。
2. Description of the Related Art One of conventional refrigerant circuits of this type of air conditioner is disclosed.
An example is shown in FIG. A plurality (three in the figure) of indoor units 2A, 2B, and 2C are connected in parallel to the outdoor unit 1 via refrigerant pipes 3A and 3B. The outdoor unit 1 includes a compressor 4, a four-way valve 5, an outdoor heat exchanger 6, a plurality of (three in the figure) outdoor fans 7A, 7B, 7C, an accumulator 8, and the like. Indoor units 2A, 2B, 2C are indoor heat exchangers 9A, 9B, 9C, indoor fans 10A, 10B, 10C, electronic expansion valves 11A, 11B, 11C, respectively.
Etc. are provided.

【0003】しかして、全ての室内機2A、2B、2Cの冷房
運転時、圧縮機4から吐出されたガス冷媒は四方弁5を
経て室外熱交換器6に入り、ここで室外フアン7A、7B、
7Cによって送られた外気に放熱することによって凝縮液
化する。この液冷媒は冷媒配管3Aを経て室内機2A、2B、
2Cに並列に流入し、電子膨張弁11A 、11B 、11C で断熱
膨張した後、室内熱交換器9A、9B、9Cで室内フアン10A
、10B 、10C によって送られた室内空気を冷却するこ
とによって蒸発気化する。このガス冷媒は冷媒配管3Bを
経て室外機1に戻り、四方弁5、アキュムレ−タ8を経
て圧縮機4に吸入される。
During the cooling operation of all the indoor units 2A, 2B, and 2C, the gas refrigerant discharged from the compressor 4 enters the outdoor heat exchanger 6 via the four-way valve 5, where the outdoor fans 7A, 7B ,
Condensed and liquefied by radiating heat to the outside air sent by 7C. This liquid refrigerant passes through the refrigerant pipe 3A, and the indoor units 2A, 2B,
After flowing in parallel to 2C and adiabatically expanding at the electronic expansion valves 11A, 11B, and 11C, the indoor fan 10A at the indoor heat exchangers 9A, 9B, and 9C.
, 10B, 10C evaporate by cooling the room air sent by the air. This gas refrigerant returns to the outdoor unit 1 through the refrigerant pipe 3B, and is sucked into the compressor 4 through the four-way valve 5 and the accumulator 8.

【0004】室内機2A、2B、2Cの暖房運転時、圧縮機4
から吐出された冷媒は四方弁5、冷媒配管3Bを経て室内
機2A、2B、2Cに並列に流入し、その室内熱交換器9A、9
B、9Cで凝縮液化した後、電子膨張弁11A 、11B 、11C
で断熱膨張する。そして、この冷媒は冷媒配管3Aを経て
室外機1に戻り室外熱交換器6で蒸発気化した後、四方
弁5、アキュムレ−タ8を経て圧縮機4に戻る。
During the heating operation of the indoor units 2A, 2B and 2C, the compressor 4
Is discharged in parallel to the indoor units 2A, 2B, 2C via the four-way valve 5 and the refrigerant pipe 3B, and the indoor heat exchangers 9A, 9C
After condensed and liquefied in B, 9C, electronic expansion valves 11A, 11B, 11C
Adiabatic expansion with. Then, the refrigerant returns to the outdoor unit 1 through the refrigerant pipe 3A, evaporates and evaporates in the outdoor heat exchanger 6, and then returns to the compressor 4 through the four-way valve 5 and the accumulator 8.

【0005】室内機2A、2B、2Cのいずれか、例えば、2C
を休止し又は送風運転する場合には、その電子膨張弁11
C が全閉とされ、運転中の室内機2A、2Bの能力はその電
子膨張弁11A 、11B の開度を室内機2A、2Bの負荷に応じ
て変更することによって調整される。そして、室内機2
A、2Bの能力に応じて圧縮機4の能力を変更することに
よって室外機1の能力が調整される。
[0005] Any of the indoor units 2A, 2B and 2C, for example, 2C
When the air expansion operation is stopped or the electronic expansion valve 11
The capacity of the indoor units 2A and 2B during operation when C is fully closed is adjusted by changing the opening of the electronic expansion valves 11A and 11B in accordance with the loads on the indoor units 2A and 2B. And indoor unit 2
The capacity of the outdoor unit 1 is adjusted by changing the capacity of the compressor 4 according to the capacity of A and 2B.

【0006】冷房運転時、外気温が低下すると、冷媒の
凝縮温度が低下し、冷媒回路内の高圧(圧縮機から電子
膨張弁に至る回路内の冷媒圧力)が低下する。これに伴
って冷媒回路内の低圧(電子膨張弁から圧縮機に至る回
路内の冷媒圧力)が低下して冷媒の蒸発温度が低下す
る。冷媒の蒸発温度が低下して室内熱交換器9A、9B、9C
の表面温度が0℃以下になると、その表面に霜が付着し
て冷房能力が低下する。これに対処するため、外気温が
低下したとき、外気温に応じて室外フアン7A、7B、7Cの
運転台数を低減し、室外熱交換器6を流過する風量を低
減することにより室外熱交換器6の熱交換量を低減して
冷媒回路内の高圧を上げていた。
During the cooling operation, when the outside air temperature decreases, the condensation temperature of the refrigerant decreases, and the high pressure in the refrigerant circuit (the refrigerant pressure in the circuit from the compressor to the electronic expansion valve) decreases. Along with this, the low pressure (refrigerant pressure in the circuit from the electronic expansion valve to the compressor) in the refrigerant circuit decreases, and the evaporation temperature of the refrigerant decreases. Refrigerant evaporation temperature drops and indoor heat exchangers 9A, 9B, 9C
When the surface temperature becomes 0 ° C. or lower, frost adheres to the surface, and the cooling capacity decreases. To cope with this, when the outdoor temperature decreases, the number of operating outdoor fans 7A, 7B, and 7C is reduced in accordance with the outdoor temperature, and the amount of air flowing through the outdoor heat exchanger 6 is reduced to reduce the outdoor heat exchange. The heat exchange amount of the heat exchanger 6 was reduced to increase the high pressure in the refrigerant circuit.

【0007】[0007]

【発明が解決しようとする課題】上記従来の空気調和機
においては、外気温に応じて全ての室外フアン7A、7B、
7Cの運転停止を頻繁に繰り返していたため、リレーの耐
久性に悪影響を及ぼすのみならず運転状態が不安定にな
るという不具合があった。また、室内機2A、2B、2Cの運
転台数が少ない場合、即ち、冷房負荷が小さい場合には
冷媒回路内の低圧が低下するため、室内熱交換器9A、9
B、9Cへの着霜を完全に防止することができなかった。
In the above conventional air conditioner, all the outdoor fans 7A, 7B,
Since the operation of the 7C was repeatedly stopped frequently, there was a problem that the durability of the relay was adversely affected and the operation state became unstable. Further, when the number of operating indoor units 2A, 2B, 2C is small, that is, when the cooling load is small, the low pressure in the refrigerant circuit decreases, so the indoor heat exchangers 9A, 9C
B, 9C could not be completely prevented from forming frost.

【0008】[0008]

【課題を解決するための手段】本発明は上記課題を解決
するために発明されたものであって、その要旨とすると
ころは、室外熱交換器に外気を送風するための複数台の
室外フアンを備えた室外機に対して複数台の室内機を冷
媒配管を介して並列に接続してなる空気調和機におい
て、上記室内機の運転台数に応じて上記室外フアンの運
転台数範囲を決定する手段と、決定された運転台数範囲
内において外気温センサによって検出された外気温に応
じて上記室外フアンの運転台数及びその回転速度を決定
する手段を設けたことを特徴とする空気調和機にある。
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its gist is to provide a plurality of outdoor fans for blowing outside air to an outdoor heat exchanger. Means for determining the operating number range of the outdoor fan according to the operating number of the indoor units in an air conditioner in which a plurality of indoor units are connected in parallel via refrigerant piping to the outdoor unit having And means for determining the number of operating outdoor fans and the rotation speed thereof in accordance with the outside air temperature detected by the outside air temperature sensor within the determined operating number range.

【0009】[0009]

【作用】本発明においては、上記構成を具えているた
め、室内機の運転台数に応じて室外フアンの運転台数範
囲を決定し、決定された運転台数範囲内において外気温
に応じて室外フアンの運転台数及びその回転速度を決定
する。
According to the present invention, since the above configuration is provided, the operating number range of the outdoor fan is determined according to the operating number of the indoor units, and the outdoor fan number is determined within the determined operating number range according to the outside temperature. Determine the number of operating units and their rotation speed .

【0010】[0010]

【実施例】本発明の1実施例が図1及び図2に示されて
いる。図1に示すように、各室内機2A、2B、2Cの運転モ
ード、能力等は制御信号線12A 、12B 、12C を介してコ
ントローラ13に入力される。また、室外熱交換器6に流
入する外気の温度は外気温センサ14によって検知されて
コントローラ13に入力される。そして、コントローラ13
の出力よって複数台の室外フアン7A、7B、7Cの運転が調
節される。他の構成は図3に示す従来のものと同様であ
り、対応する部材には同じ符号が付されている。
DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIGS. As shown in FIG. 1, the operation mode, capacity, etc. of each indoor unit 2A, 2B, 2C are input to the controller 13 via control signal lines 12A, 12B, 12C. Further, the temperature of the outside air flowing into the outdoor heat exchanger 6 is detected by the outside air temperature sensor 14 and input to the controller 13. And controller 13
The operation of the plurality of outdoor fans 7A, 7B, 7C is adjusted by the output of. The other configuration is the same as that of the conventional one shown in FIG. 3, and the corresponding members are denoted by the same reference numerals.

【0011】図2にはコントローラ13の制御ブロック図
が示されている。室内機2Aの運転スイッチ21、室内機2B
の運転スイッチ22、室内機2Cの運転スイッチ23の出力は
コントローラ13の室外フアンの運転台数範囲決定手段24
に入力され、ここで室内機2A、2B、2Cの運転台数、即
ち、冷房負荷が合算され、合算された冷房負荷に応じて
記憶手段25に予め設定されて記憶されている制御ルール
に従って室外フアン7A、7B、7Cの運転台数範囲が決定さ
れる。決定結果は室外フアンの運転台数決定手段26に入
力され、ここで外気温センサ14で検出された外気温に応
じて記憶手段27に予め設定されて記憶されている制御ル
ールに従って室外フアンの運転台数及びその回転速度が
決定される。この決定結果は出力手段28、29、30を経て
室外フアン7A、7B、7Cに入力され、そのタップが停止、
高速(Hi)、中速(Me)又は低速(Lo)に切換えられる。
FIG. 2 is a control block diagram of the controller 13. Operation switch 21 of indoor unit 2A, indoor unit 2B
The output of the operation switch 22 of the indoor unit 2C and the output of the operation switch 23 of the indoor unit 2C
Here, the operating number of the indoor units 2A, 2B, 2C, that is, the cooling loads are summed up, and the outdoor fan is set in the storage means 25 in accordance with the summed cooling load and according to a control rule stored in advance. The operating number range of 7A, 7B and 7C is determined. The determination result is input to the outdoor fan operating number determining means 26, and here, the outdoor fan operating number is determined according to a control rule preset and stored in the storage means 27 in accordance with the outside temperature detected by the outside temperature sensor 14. And its rotation speed. This determination result is input to the outdoor fans 7A, 7B, 7C via output means 28, 29, 30 and the tap stops,
It is switched to high speed (Hi), medium speed (Me) or low speed (Lo).

【0012】しかして、室内機2A、2B、2Cの運転台数に
応じて室外フアン7A、7B、7Cの運転台数範囲が決定さ
れ、この範囲内において外気温に応じて室外フアンの運
転台数及びその回転速度が決定されるので、室外フアン
の運転台数の変化が少なくなる。
Thus, the operating number range of the outdoor fans 7A, 7B, 7C is determined according to the operating number of the indoor units 2A, 2B, 2C, and within this range the operating number of the outdoor fans and the operating number thereof are determined according to the outside temperature. Since the rotation speed is determined, a change in the number of operating outdoor fans is reduced.

【0013】[0013]

【発明の効果】本発明においては、室内機の運転台数に
応じて室外フアンの運転台数範囲が決定され、この運転
台数範囲内において外気温に応じて室外フアンの運転台
及びその回転速度が決定されるので、室外フアンの運
転台数変化を少なくすることができ、この結果、室外フ
アンの運転・停止及びその回転速度の切り換えが頻繁に
繰り返されるのを防止して空気調和機の運転状態を安定
化できる。また、冷房運転時に外気温が低下した場合に
おいて、室内機の運転台数が少ない場合であっても室外
フアンの運転台数及びその回転速度を外気温に応じて変
化させることによって冷媒回路内の高圧を所定値以上に
維持できるので、室内熱交換器への着霜を阻止して冷房
能力の低下を防止できる。
According to the present invention, the operating number range of the outdoor fan is determined according to the operating number of the indoor units, and within this operating number range, the operating number and the rotation speed of the outdoor fan are determined according to the outside temperature. Luck of outdoor Juan
It is possible to reduce the change in the number of
Frequent switching of run / stop of ann and its rotation speed
Prevents repeated operation and stabilizes the operating condition of the air conditioner
Can be Also, when the outside air temperature decreases during the cooling operation, even if the number of operating indoor units is small, the outdoor
The number of fans operating and their rotation speeds vary according to the outside air temperature.
By this, the high pressure in the refrigerant circuit can be maintained at a predetermined value or more, so that frost formation on the indoor heat exchanger can be prevented, and a decrease in cooling capacity can be prevented.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の1実施例を示す系統図である。FIG. 1 is a system diagram showing one embodiment of the present invention.

【図2】上記実施例の制御ブロック図である。FIG. 2 is a control block diagram of the embodiment.

【図3】従来の空気調和機の冷媒回路図である。FIG. 3 is a refrigerant circuit diagram of a conventional air conditioner.

【符号の説明】[Explanation of symbols]

1 室外機 6 室外熱交換器 7A、7B、7C 室外フアン 2A、2B、2C 室内機 3A、3B 冷媒配管 13 コントローラ 14 外気温センサ 21、22、23 室内機の運転スイッチ 24 室外フアンの運転台数範囲決定手段 26 室外フアンの運転台数決定手段 1 outdoor unit 6 outdoor heat exchanger 7A, 7B, 7C outdoor fan 2A, 2B, 2C indoor unit 3A, 3B refrigerant piping 13 controller 14 outside temperature sensor 21, 22, 23 indoor unit operation switch 24 outdoor fan operation number range Means for determining 26 Number of outdoor fan operating units

フロントページの続き (72)発明者 佐々倉 正彦 愛知県西春日井郡西枇杷島町字旭町三丁 目1番地 三菱重工業株式会社 エアコ ン製作所内 (56)参考文献 実開 昭57−201473(JP,U) 実開 昭63−40748(JP,U) (58)調査した分野(Int.Cl.6,DB名) F24F 11/02 102 Continuation of the front page (72) Inventor Masahiko Sasakura, 1-1 Asahicho, Nishibiwajima-cho, Nishikasugai-gun, Aichi Prefecture Mitsubishi Heavy Industries, Ltd. Aircon Works Actual Opening Sho 63-40748 (JP, U) (58) Field surveyed (Int. Cl. 6 , DB name) F24F 11/02 102

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 室外熱交換器に外気を送風するための複
数台の室外フアンを備えた室外機に対して複数台の室内
機を冷媒配管を介して並列に接続してなる空気調和機に
おいて、上記室内機の運転台数に応じて上記室外フアン
の運転台数範囲を決定する手段と、決定された運転台数
範囲内において外気温センサによって検出された外気温
に応じて上記室外フアンの運転台数及びその回転速度
決定する手段を設けたことを特徴とする空気調和機。
1. An air conditioner comprising a plurality of indoor units connected in parallel via a refrigerant pipe to an outdoor unit having a plurality of outdoor fans for blowing outside air to an outdoor heat exchanger. Means for determining the operating number range of the outdoor fan according to the operating number of the indoor units, and the operating number of the outdoor fan and the operating number of the outdoor fan according to the outside temperature detected by the outside air temperature sensor within the determined operating number range. An air conditioner comprising means for determining the rotation speed .
JP4098537A 1992-03-26 1992-03-26 Air conditioner Expired - Fee Related JP2989370B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4098537A JP2989370B2 (en) 1992-03-26 1992-03-26 Air conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4098537A JP2989370B2 (en) 1992-03-26 1992-03-26 Air conditioner

Publications (2)

Publication Number Publication Date
JPH05272793A JPH05272793A (en) 1993-10-19
JP2989370B2 true JP2989370B2 (en) 1999-12-13

Family

ID=14222442

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4098537A Expired - Fee Related JP2989370B2 (en) 1992-03-26 1992-03-26 Air conditioner

Country Status (1)

Country Link
JP (1) JP2989370B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5884381B2 (en) * 2011-09-30 2016-03-15 ダイキン工業株式会社 Refrigeration unit outdoor unit

Also Published As

Publication number Publication date
JPH05272793A (en) 1993-10-19

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