JPH08226721A - Operation controller for air conditioning equipment for multiple room - Google Patents
Operation controller for air conditioning equipment for multiple roomInfo
- Publication number
- JPH08226721A JPH08226721A JP3031995A JP3031995A JPH08226721A JP H08226721 A JPH08226721 A JP H08226721A JP 3031995 A JP3031995 A JP 3031995A JP 3031995 A JP3031995 A JP 3031995A JP H08226721 A JPH08226721 A JP H08226721A
- Authority
- JP
- Japan
- Prior art keywords
- opening
- compressor
- expansion valve
- electric expansion
- outdoor
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/21—Refrigerant outlet evaporator temperature
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、１台の室外ユニットに
複数台の室内ユニットを接続し、電動膨張弁により冷媒
流量を制御する多室用空気調和機の運転制御装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control device for a multi-room air conditioner in which a plurality of indoor units are connected to one outdoor unit and a refrigerant flow rate is controlled by an electric expansion valve.
【０００２】[0002]
【従来の技術】近年、空気調和機が普及しているが、室
外ユニットが１台で済む多室用空気調和機は設置スペー
スの点で有効な装置である。2. Description of the Related Art In recent years, air conditioners have become widespread, but a multi-room air conditioner that requires only one outdoor unit is an effective device in terms of installation space.
【０００３】以下、従来の多室用空気調和機の運転制御
装置について説明する。従来、この種の多室用空気調和
機は、能力可変圧縮機（以下、単に圧縮機と称す）を備
えた１台の室外ユニットに、分岐ユニットを介して、ま
たは直接に、複数台の室内ユニットを接続して構成さ
れ、その冷凍サイクルの絞り装置として電動膨張弁を設
け、温度センサなどを用いて検出した圧縮機の吸入冷媒
の過熱度の値が一定値になるように上記の電動膨張弁の
開度を制御（以下、過熱度制御と称す）して、冷凍サイ
クルを調整していた。A conventional operation control device for a multi-room air conditioner will be described below. Conventionally, this type of multi-room air conditioner has been constructed such that one outdoor unit equipped with a variable capacity compressor (hereinafter simply referred to as a compressor) is provided to a plurality of indoor units via a branch unit or directly. An electric expansion valve is provided as a throttle device for the refrigeration cycle of the unit, and the above electric expansion is performed so that the superheat value of the refrigerant sucked into the compressor detected by using a temperature sensor, etc. becomes a constant value. The refrigeration cycle was adjusted by controlling the valve opening (hereinafter referred to as superheat control).
【０００４】また、運転開始時は過熱度の検出ができな
いため、過熱度制御に入る前の電動膨張弁開度は、その
電動膨張弁の最大開度、または所定の開度に設定し、そ
の開度から過熱度制御を始めるようにしていた。Further, since the degree of superheat cannot be detected at the start of operation, the opening degree of the electric expansion valve before the superheat degree control is started is set to the maximum opening degree or a predetermined opening degree of the electric expansion valve. The superheat control was started from the opening.
【０００５】[0005]
【発明が解決しようとする課題】このような従来の多室
用空気調和機では、冷房運転において、室外気温が高
く、かつ圧縮機の運転周波数が高いとき、すなわち過負
荷条件で運転される場合にも、圧縮機の過熱度が一定と
なるように電動膨張弁開度が制御されるため、圧力が高
くなるとともに、圧縮機から吐出される冷媒温度も高く
なって、製品、とくに圧縮機の寿命が短くなる要因とな
っていた。In such a conventional multi-room air conditioner, when the outdoor temperature is high and the operating frequency of the compressor is high in the cooling operation, that is, when it is operated under an overload condition. Also, since the electric expansion valve opening is controlled so that the degree of superheat of the compressor becomes constant, the pressure rises and the temperature of the refrigerant discharged from the compressor also rises. It was a factor that shortened the life.
【０００６】また、暖房運転において、室外気温が低
く、かつ圧縮機の運転周波数が高いとき、すなわち室外
熱交換器に霜が付きやすい条件で運転される場合にも、
圧縮機の過熱度が一定となるように電動膨張弁開度が制
御されるため、霜が付きはじめて冷房の過熱度が低下す
るに従って電動膨張弁開度は小さくなり、それによりさ
らに霜が増長し、暖房能力が急激に低下するという問題
がある。Also, in the heating operation, when the outdoor temperature is low and the operating frequency of the compressor is high, that is, when the outdoor heat exchanger is operated under a condition where frost is likely to occur,
Since the electric expansion valve opening is controlled so that the superheat of the compressor becomes constant, the electric expansion valve opening becomes smaller as the superheat of cooling starts to decrease due to frost, which further increases frost. However, there is a problem that the heating capacity drops sharply.
【０００７】また、運転開始時において、過熱度の検出
ができないため、過熱度制御に入る前の最初の電動膨張
弁開度は、その電動膨張弁の最大開度、または所定の開
度に設定されるので、たとえば、室内の負荷、外気温な
どのあらゆる運転状況に対し、冷媒の過熱度が目標値に
達して冷凍サイクルが安定するまで、かなりの時間を要
する場合があるという問題があった。Further, since the degree of superheat cannot be detected at the start of operation, the first electric expansion valve opening before entering the superheat control is set to the maximum opening of the electric expansion valve or a predetermined opening. Therefore, there is a problem that it may take a considerable time until the refrigerant superheat reaches a target value and the refrigeration cycle stabilizes under various operating conditions such as indoor load and outdoor temperature. .
【０００８】本発明は上記の課題を解決するもので、冷
房過負荷運転時でも正常な冷凍サイクルを維持し、ま
た、暖房低温時に室外熱交換器へ着霜を鈍らせ、暖房能
力の急激な低下を防止し、また、あらゆる運転状況に対
して、冷凍サイクルの安定するまでの時間を短くして、
機器の信頼性が高く、快適性が向上した多室用空気調和
機の運転制御装置を提供することを目的とする。The present invention solves the above-mentioned problems, and maintains a normal refrigeration cycle even during cooling overload operation, and slows the frost formation on the outdoor heat exchanger when the heating temperature is low, thereby increasing the heating capacity rapidly. Prevents the decrease and shortens the time until the refrigeration cycle stabilizes for all operating conditions,
It is an object of the present invention to provide an operation control device for a multi-room air conditioner, which has high equipment reliability and improved comfort.
【０００９】[0009]
【課題を解決するための手段】請求項１に係わる発明
は、圧縮機、室外熱交換器、室外ファン、四方弁、およ
び液側主管に設けた電動膨張弁などからなる室外ユニッ
トに、冷媒分岐ユニットを介して、または直接に、室内
熱交換器および送風機などからなる室内ユニットを複数
台接続して冷凍サイクルを構成し、前記圧縮機の吸入冷
媒温度と低圧の圧力飽和相当温度とを検出し、その温度
差、すなわち前記圧縮機の吸入冷媒の過熱度が、所定の
設定値になるように前記電動膨張弁の開度を制御する開
度制御手段を備えた多室用空気調和機において、冷房運
転時に室外気温が所定値より高く、かつ前記圧縮機の運
転周波数が所定値より高い場合に、前記開度制御手段の
制御を無効にするとともに、前記電動膨張弁の開度を所
定の開度に設定する開度補正手段を備えた多室用空気調
和機の運転制御装置であり、また、請求項２に係わる発
明は、圧縮機、室外熱交換器、室外ファン、四方弁、お
よび液側主管に設けた電動膨張弁などからなる室外ユニ
ットに、冷媒分岐ユニットを介して、または直接に、室
内熱交換器および送風機などからなる室内ユニットを複
数台接続して冷凍サイクルを構成し、前記圧縮機の吸入
冷媒温度と低圧の圧力飽和相当温度とを検出し、その温
度差、すなわち前記圧縮機の吸入冷媒の過熱度が、所定
の第１の設定値になるように前記電動膨張弁の開度を制
御する開度制御手段を備えた多室用空気調和機におい
て、冷房運転時に室外気温が所定値より高く、かつ前記
圧縮機の運転周波数が所定値より高い場合に、前記過熱
度設定値を、前記第１の設定値よりも低い第２の所定の
設定値に変える開度補正手段を備えた多室用空気調和機
の運転制御装置であり、また、請求項３に係わる発明
は、圧縮機、室外熱交換器、室外ファン、四方弁、およ
び液側主管に設けた電動膨張弁などからなる室外ユニッ
トに、冷媒分岐ユニットを介して、または直接に、室内
熱交換器および送風機などからなる室内ユニットを複数
台接続して冷凍サイクルを構成し、前記圧縮機の吸入冷
媒温度と低圧の圧力飽和相当温度とを検出し、その温度
差、すなわち前記圧縮機の吸入冷媒の過熱度が、所定の
設定値になるように前記電動膨張弁の開度を制御する開
度制御手段を備えた多室用空気調和機において、暖房運
転時に室外気温が所定値より低く、かつ圧縮機の運転周
波数が所定値より高い場合、前記開度制御手段の制御を
無効にするとともに、前記電動膨張弁の開度を所定の開
度に設定する開度補正手段を備えた多室用空気調和機の
運転制御装置であり、また、請求項４に係わる発明は、
圧縮機、室外熱交換器、室外ファン、四方弁、および液
側主管に設けた電動膨張弁などからなる室外ユニット
に、冷媒分岐ユニットを介して、または直接に、室内熱
交換器および送風機などからなる室内ユニットを複数台
接続して冷凍サイクルを構成し、前記圧縮機の吸入冷媒
温度と低圧の圧力飽和相当温度とを検出し、その温度
差、すなわち前記圧縮機の吸入冷媒の過熱度が、所定の
第１の設定値になるように前記電動膨張弁の開度を制御
する開度制御手段を備えた多室用空気調和機において、
暖房運転時に室外気温が所定値より低く、かつ圧縮機の
運転周波数が所定値より高い場合に、前記開度制御手段
を無効として、前記過熱度設定値を、前記第１の設定値
よりも低い第２の所定の設定値に変える開度補正手段を
備えた多室用空気調和機の運転制御装置であり、また、
請求項５に係わる発明は、圧縮機、室外熱交換器、室外
ファン、四方弁、および液側主管に設けた電動膨張弁な
どからなる室外ユニットに、冷媒分岐ユニットを介し
て、または直接に、室内熱交換器および送風機などから
なる室内ユニットを複数台接続して冷凍サイクルを構成
し、前記圧縮機の吸入冷媒温度と低圧の圧力飽和相当温
度とを検出し、その温度差、すなわち前記圧縮機の吸入
冷媒の過熱度が、所定の設定値になるように前記電動膨
張弁の開度を制御する開度制御手段を備えた多室用空気
調和機において、運転開始時の前記電動膨張弁の最初の
開度を設定する初期開度設定手段を設け、前記初期開度
設定手段は、運転開始時の条件に基づいて電動膨張弁の
初期開度を決定するようにした多室用空気調和機の運転
制御装置であり、また、請求項６に係わる発明は、初期
開度設定手段は、圧縮機の運転周波数により電動膨張弁
の開度を決定するようにした請求項５に係わる多室用空
気調和機の運転制御装置であり、また、請求項７に係わ
る発明は、初期開度設定手段は、室外気温に従って電動
膨張弁の初期を決定するようにした請求項５に係わる多
室用空気調和機の運転制御装置であり、また、請求項８
に係わる発明は、初期開度設定手段は、圧縮機の運転周
波数と室外気温との２つの要素に従って電動膨張弁の初
期開度を決定するようにした請求項５に係わる多室用空
気調和機の運転制御装置であり、また、請求項９に係わ
る発明は、初期開度設定手段は、接続されている室内ユ
ニットの総台数に従って電動膨張弁の初期開度を決定す
るようにした請求項５記載の多室用空気調和機の運転制
御装置である。The invention according to claim 1 relates to an outdoor unit comprising a compressor, an outdoor heat exchanger, an outdoor fan, a four-way valve, an electric expansion valve provided in a liquid side main pipe, and a refrigerant branch. A refrigeration cycle is configured by connecting a plurality of indoor units including an indoor heat exchanger and a blower through a unit or directly to detect the refrigerant refrigerant intake temperature and the low pressure equivalent pressure saturation temperature. , The temperature difference, that is, the degree of superheat of the refrigerant sucked into the compressor, in a multi-room air conditioner having an opening control means for controlling the opening of the electric expansion valve so as to be a predetermined set value, When the outdoor temperature is higher than a predetermined value during the cooling operation and the operating frequency of the compressor is higher than the predetermined value, the control of the opening control means is disabled and the opening of the electric expansion valve is opened to a predetermined value. To set The invention according to claim 2 is provided in the compressor, the outdoor heat exchanger, the outdoor fan, the four-way valve, and the liquid side main pipe. An outdoor unit such as an electric expansion valve is connected to a plurality of indoor units such as an indoor heat exchanger and a blower via a refrigerant branching unit or directly to form a refrigeration cycle, and a refrigerant sucked into the compressor. The temperature and the low pressure equivalent to the pressure saturation are detected, and the opening of the electric expansion valve is controlled so that the temperature difference, that is, the superheat degree of the refrigerant sucked into the compressor becomes a predetermined first set value. In a multi-room air conditioner having an opening degree control means, when the outdoor air temperature is higher than a predetermined value during cooling operation and the operating frequency of the compressor is higher than a predetermined value, the superheat setting value is set to Lower than the set value of 1 An operation control device for a multi-room air conditioner, comprising an opening correction means for changing to a second predetermined set value, and the invention according to claim 3 is a compressor, an outdoor heat exchanger, an outdoor fan, A refrigeration cycle in which a plurality of indoor units such as indoor heat exchangers and blowers are connected to an outdoor unit including a four-way valve and an electric expansion valve provided in the liquid side main pipe, directly or through a refrigerant branching unit. And a temperature corresponding to the pressure saturation of the low pressure of the compressor is detected, and the temperature difference, that is, the degree of superheat of the suction refrigerant of the compressor is set to a predetermined set value by the electric expansion. In a multi-room air conditioner having an opening control means for controlling the opening of a valve, when the outdoor air temperature is lower than a predetermined value during heating operation and the operating frequency of the compressor is higher than a predetermined value, the opening control is performed. Disable control of means In addition, the invention relates to an operation control device for a multi-room air conditioner, which is provided with an opening degree correction means for setting the opening degree of the electric expansion valve to a predetermined opening degree.
An indoor unit such as a compressor, an outdoor heat exchanger, an outdoor fan, a four-way valve, and an electric expansion valve provided on the liquid side main pipe, through a refrigerant branch unit, or directly from an indoor heat exchanger and a blower. A plurality of indoor units are connected to form a refrigeration cycle, and the refrigerant suction temperature of the compressor and the pressure saturation equivalent temperature of low pressure are detected, and the temperature difference, that is, the degree of superheat of the refrigerant suction of the compressor, In a multi-room air conditioner provided with an opening control means for controlling the opening of the electric expansion valve so as to have a predetermined first set value,
When the outdoor air temperature is lower than the predetermined value and the operating frequency of the compressor is higher than the predetermined value during the heating operation, the opening degree control unit is disabled and the superheat degree setting value is lower than the first setting value. An operation control device for a multi-room air conditioner, comprising an opening correction means for changing to a second predetermined set value, and
According to a fifth aspect of the present invention, an outdoor unit including a compressor, an outdoor heat exchanger, an outdoor fan, a four-way valve, an electric expansion valve provided in a liquid side main pipe, or the like is provided directly or via a refrigerant branching unit. A plurality of indoor units including an indoor heat exchanger and a blower are connected to form a refrigeration cycle, and a suction refrigerant temperature of the compressor and a low-pressure pressure saturation equivalent temperature are detected, and the temperature difference, that is, the compressor. In the multi-chamber air conditioner having an opening degree control means for controlling the opening degree of the electric expansion valve so that the degree of superheat of the suction refrigerant becomes a predetermined set value. An initial opening setting means for setting an initial opening is provided, and the initial opening setting means determines the initial opening of the electric expansion valve based on a condition at the time of starting operation. The operation control device of The invention according to claim 6 is the operation control device for a multi-room air conditioner according to claim 5, wherein the initial opening setting means determines the opening of the electric expansion valve according to the operating frequency of the compressor. The invention according to claim 7 is the operation control device for a multi-room air conditioner according to claim 5, wherein the initial opening setting means determines the initial stage of the electric expansion valve according to the outdoor temperature. And claim 8
The invention according to claim 5 is characterized in that the initial opening setting means determines the initial opening of the electric expansion valve according to two factors of the operating frequency of the compressor and the outdoor temperature. The operation control device according to claim 9, and the invention according to claim 9 is characterized in that the initial opening setting means determines the initial opening of the electric expansion valve according to the total number of connected indoor units. It is an operation control device of the multi-room air conditioner described.
【００１０】[0010]
【作用】請求項１に係わる発明において、冷房運転にお
いて、室外気温が高く、かつ圧縮機の運転周波数が高い
とき、すなわち過負荷条件で運転される場合、開度補正
手段は、開度制御手段による開度制御を停止し、電動膨
張弁の開度を所定値まで開いて保持する。この状態で運
転するとき、高圧と吐出温度とが低下し、圧縮機の信頼
性および寿命を向上させる。また、請求項２に係わる発
明において、冷房運転において、室外気温が高く、かつ
圧縮機の運転周波数が高いとき、すなわち過負荷条件で
運転される場合、開度補正手段は過熱度設定値を低い値
に設定する。この状態で開度制御手段の制御のもとに運
転すると、高圧と吐出温度とが低下して圧縮機の信頼性
および寿命を向上させる。また、請求項３および請求項
５に係わる発明において、暖房運転において、室外気温
が低く、かつ圧縮機の運転周波数が高いとき、すなわち
室外熱交換器に霜が付き易い条件で運転される場合、開
度補正手段は、開度制御手段による開度制御を停止し、
電動膨張弁の開度を所定値まで開いて保持する。この状
態で運転するとき、低圧が上昇して霜の増長を抑制し、
急激な暖房能力の低下を防止する。また、請求項４に係
わる発明において、暖房運転において、室外気温が低
く、かつ圧縮機の運転周波数が高いとき、すなわち室外
熱交換器に霜が付き易い条件で運転される場合、開度補
正手段は過熱度設定値を低い所定の値に設定する。この
状態で開度制御手段による制御のもとで運転すると、電
動膨張弁の開度は広がり、上記同様、急激な暖房能力の
低下を防止する。また、請求項５ないし請求項８に係わ
る発明において、初期値設定手段は、運転開始時の最初
の電動膨張弁開度を、圧縮機の運転周波数、室外気温、
または運転周波数と室外気温との２つの要素、または接
続されている室内ユニットの総台数に応じ、その運転状
況に対して冷凍サイクルが安定するような、所定の開度
に設定することで、あらゆる運転状況に対しても冷凍サ
イクルは短時間で安定に達し、快適性を向上させる。In the invention according to claim 1, in the cooling operation, when the outdoor temperature is high and the operating frequency of the compressor is high, that is, when the compressor is operated under an overload condition, the opening correction means is the opening control means. The opening degree control by means of (1) is stopped, and the opening degree of the electric expansion valve is opened and maintained to a predetermined value. When operating in this state, the high pressure and discharge temperature are reduced, improving the reliability and life of the compressor. Further, in the invention according to claim 2, in the cooling operation, when the outdoor temperature is high and the operating frequency of the compressor is high, that is, when the compressor is operated under an overload condition, the opening degree correction means sets the superheat degree set value to a low value. Set to the value. When operated under the control of the opening control means in this state, the high pressure and the discharge temperature are lowered, and the reliability and life of the compressor are improved. Further, in the inventions according to claims 3 and 5, in the heating operation, when the outdoor air temperature is low and the operating frequency of the compressor is high, that is, when the outdoor heat exchanger is operated under a condition where frost easily occurs, The opening correction means stops the opening control by the opening control means,
The opening of the electric expansion valve is opened and maintained to a predetermined value. When operating in this state, the low pressure rises and suppresses the growth of frost,
Prevent a sudden decrease in heating capacity. Further, in the invention according to claim 4, during heating operation, when the outdoor temperature is low and the operating frequency of the compressor is high, that is, when the outdoor heat exchanger is operated under the condition that frost is likely to occur, the opening degree correction means Sets the superheat setting value to a low predetermined value. When operating under the control of the opening degree control means in this state, the opening degree of the electric expansion valve widens, and like the above, a sudden decrease in heating capacity is prevented. Further, in the invention according to claims 5 to 8, the initial value setting means sets the first electric expansion valve opening degree at the start of operation to the operating frequency of the compressor, the outdoor temperature,
Alternatively, according to the two factors of the operating frequency and the outdoor temperature, or the total number of connected indoor units, a predetermined opening is set so that the refrigeration cycle is stable with respect to the operating condition, The refrigeration cycle can reach a stable state in a short time even for operating conditions, and improve comfort.
【００１１】[0011]
（実施例１）以下、本発明の多室用空気調和機の運転制
御装置の一実施例について図面を参照しながら説明す
る。図１は本実施例の構成を示す冷凍サイクル図であ
る。図において、Ｘは室外ユニット、Ｙ１およびＹ２は
分岐ユニット、Ａ〜Ｆはそれぞれ室内ユニットである。
室外ユニットＸ内には周波数可変型の圧縮機１、室外側
熱交換器２、冷暖房切り替え用の四方弁３、電動膨張弁
４を備えている。室外ユニットＸには２台の分岐ユニッ
トＹ１とＹ２がそれぞれ接続配管５と６を介して接続さ
れ、分岐ユニットＹ１には３個の電動膨張弁７ａ、７
ｂ、および７ｃが設けられ、同様に分岐ユニットＹ２に
も電動膨張弁７ｄ、７ｅ、および７ｆが設けられてい
る。分岐ユニットＹ１には３台の室内ユニットＡ、Ｂ、
およびＣが、また分岐ユニットＹ２にも３台の室内ユニ
ットＤ、Ｅ、およびＦが接続され、冷凍サイクルが構成
されている。なお、８ａ〜８ｆはそれぞれ室内ユニット
Ａ〜Ｆに設けられた室内側熱交換器である。また、１４
は電動膨張弁の開度を制御する開度制御手段、１５は電
動膨張弁の開度を補正する開度補正手段、１６は運転開
始時の電動膨張弁の初期開度を設定する初期開度設定手
段であり、これらは本発明の多室用空気調和機の運転制
御装置を構成する。(Embodiment 1) An embodiment of the operation control device for a multi-room air conditioner of the present invention will be described below with reference to the drawings. FIG. 1 is a refrigeration cycle diagram showing the configuration of this embodiment. In the figure, X is an outdoor unit, Y1 and Y2 are branching units, and A to F are indoor units.
The outdoor unit X includes a variable frequency compressor 1, an outdoor heat exchanger 2, a four-way valve 3 for switching between heating and cooling, and an electric expansion valve 4. Two branch units Y1 and Y2 are connected to the outdoor unit X via connection pipes 5 and 6, respectively, and the branch unit Y1 has three electric expansion valves 7a and 7a.
b and 7c are provided, and similarly, the branch unit Y2 is also provided with electric expansion valves 7d, 7e, and 7f. The branch unit Y1 has three indoor units A and B,
And C, and the branch unit Y2 is also connected to the three indoor units D, E, and F to form a refrigeration cycle. Note that 8a to 8f are indoor heat exchangers provided in the indoor units A to F, respectively. Also, 14
Is an opening control means for controlling the opening of the electric expansion valve, 15 is an opening correction means for correcting the opening of the electric expansion valve, and 16 is an initial opening for setting the initial opening of the electric expansion valve at the start of operation. Setting means, which constitute the operation control device of the multi-room air conditioner of the present invention.
【００１２】上記構成においける冷媒の流れについて説
明する。冷房運転時、圧縮機１から吐出された高圧のガ
ス冷媒は四方弁３を通り、室外側熱交換器２で熱交換さ
れて高圧の液冷媒となり、電動膨張弁４で絞られて低圧
の液冷媒となる。つぎに、室外ユニットＸ内で２分岐さ
れ、接続配管５を経由して分岐ユニットＹ１、接続配管
６を通って分岐ユニットＹ２に流れる。つぎに、液冷媒
は分岐ユニットＹ１では電動膨張弁７ａ、７ｂ、７ｃの
開度に応じて、適切な流量となるように３分岐され、そ
れぞれ室内側熱交換器８ａ、８ｂ、８ｃにより熱交換さ
れてガスとなり、分岐ユニットＹ１に戻る。分岐ユニッ
トＹ２についても同様である。室外ユニットＸ内で、２
台の分岐ユニットから戻ってきたガス冷媒は合流したの
ち、四方弁３を通って圧縮機１に戻る。９は電動膨張弁
４と室外側熱交換器２との中間部を吸入配管１０と結ぶ
バイパス路で、その途中にキャピラリチューブ１１が設
けられ、そのバイパス路９の吸入配管１０側に冷媒の温
度を検知する温度センサ１２が設けられており、その温
度は低圧の飽和温度に等しくなっている。また、吸入配
管１０にも吸入冷媒の温度を検地する温度センサ１３が
設けられている。開度制御手段１４は、温度センサ１２
および１３の検出出力を入力して、その温度差、すなわ
ち圧縮機１の吸入冷媒の過熱度を演算して、その結果に
基づいて電動膨張弁４の開度制御を行い、開度補正手段
１５は、冷房時の過負荷状態、または暖房時に着霜の恐
れのあるときに、電動膨張弁の動作を補正し、初期開度
設定手段１６は、運転開始時に電動膨張弁の初期開度を
設定する。なお、初期開度設定手段１６については、後
述の実施例において説明し、本実施例においては触れな
い。The flow of the refrigerant in the above structure will be described. During the cooling operation, the high-pressure gas refrigerant discharged from the compressor 1 passes through the four-way valve 3, is heat-exchanged in the outdoor heat exchanger 2 to become a high-pressure liquid refrigerant, and is throttled by the electric expansion valve 4 to be a low-pressure liquid refrigerant. It becomes a refrigerant. Next, the water is branched into two in the outdoor unit X, and flows to the branch unit Y2 via the connection pipe 5 and the branch unit Y1 and the connection pipe 6. Next, in the branch unit Y1, the liquid refrigerant is branched into three so as to have an appropriate flow rate according to the opening degree of the electric expansion valves 7a, 7b, 7c, and heat is exchanged by the indoor heat exchangers 8a, 8b, 8c, respectively. It is turned into gas and returns to the branch unit Y1. The same applies to the branch unit Y2. 2 in the outdoor unit X
The gas refrigerants returning from the branch unit of the stand join together and then return to the compressor 1 through the four-way valve 3. Reference numeral 9 denotes a bypass passage that connects the intermediate portion between the electric expansion valve 4 and the outdoor heat exchanger 2 to the suction pipe 10. A capillary tube 11 is provided in the middle of the bypass passage, and the refrigerant temperature on the suction pipe 10 side of the bypass passage 9 is shown. A temperature sensor 12 for detecting the temperature is provided, and its temperature is equal to the low-pressure saturation temperature. Further, the suction pipe 10 is also provided with a temperature sensor 13 for detecting the temperature of the suction refrigerant. The opening control means 14 includes a temperature sensor 12
The detection outputs of 13 and 13 are input, the temperature difference, that is, the superheat degree of the refrigerant sucked into the compressor 1 is calculated, and the opening degree control of the electric expansion valve 4 is performed based on the result, and the opening degree correction means 15 Corrects the operation of the electric expansion valve when there is a possibility of frost formation during cooling or during heating, and the initial opening setting means 16 sets the initial opening of the electric expansion valve at the start of operation. To do. The initial opening degree setting means 16 will be described in a later-described embodiment and will not be described in this embodiment.
【００１３】上記構成において、その動作について図面
を参照しながら説明する。図２において、実線は本実施
例における冷房時の電動膨張弁４の開度と過熱度との関
係を時間経過で示す特性図である。まず、運転開始時の
電動膨張弁４の開度は最大から始まり、開度制御手段１
４により、過熱度の目標設定値（ここでは７deg に設
定）になるように電動膨張弁４の開度が数パルスずつ絞
られていき、そののち、電動膨張弁４の開度は過熱度が
７deg の一定値になるよう微調整を行いながら安定し、
△ｔ時間後には最適な冷凍サイクルとなる。いま、図に
Ａ点で示した時点で、室外気温が高く、たとえば、３９
℃以上で、そのときの圧縮機１の運転周波数が高い場
合、たとえば、圧縮機の運転可能周波数が３０〜９０Hz
であるとすると８０Hz以上の条件であれば、上記の過熱
度制御を中止し、開度補正手段１５により、電動膨張弁
４の開度は最大値に近く、かつ液バックなど起こらない
所定開度まで開いて設定し、その状態で開度制御手段１
４の制御なしで運転すると、図に示したように、過熱度
は広げた開度に対応して急速に低下し、高圧の上がり過
ぎを抑制できる。The operation of the above structure will be described with reference to the drawings. In FIG. 2, the solid line is a characteristic diagram showing the relationship between the opening degree of the electric expansion valve 4 and the degree of superheat during cooling in the present embodiment over time. First, the opening degree of the electric expansion valve 4 at the start of operation starts from the maximum, and the opening degree control means 1
4, the opening degree of the electric expansion valve 4 is narrowed by several pulses so that the target degree of superheat degree (here, set to 7 deg) is reached. Stable while making fine adjustments to a constant value of 7deg,
The optimum refrigeration cycle is reached after Δt time. At the time point indicated by point A in the figure, the outdoor temperature is high, for example, 39
When the operating frequency of the compressor 1 at that time is high at ℃ or higher, for example, the operable frequency of the compressor is 30 to 90 Hz.
If it is a condition of 80 Hz or more, the above superheat control is stopped, and the opening correction means 15 causes the opening of the electric expansion valve 4 to be close to the maximum value and a predetermined opening at which liquid back does not occur. Open and set up, and in that state the opening control means 1
When operated without the control of No. 4, as shown in the figure, the degree of superheat rapidly decreases corresponding to the widened opening, and it is possible to suppress excessive rise of high pressure.
【００１４】以上のように、本実施例の多室用空気調和
機の運転制御装置によれば、室外気温が高く、かつ圧縮
機１の運転周波数が所定値以上に高い場合には過負荷状
態と判断し、過熱度制御を一時的に中止して電動膨張弁
を所定値まで開くようにしたことにより、高圧が上がり
過ぎるのを防止し、圧縮機を保護することができる。As described above, according to the operation control device for a multi-room air conditioner of this embodiment, when the outdoor temperature is high and the operating frequency of the compressor 1 is higher than a predetermined value, an overload condition occurs. Therefore, the superheat control is temporarily stopped and the electric expansion valve is opened to a predetermined value, whereby the high pressure can be prevented from rising too much and the compressor can be protected.
【００１５】なお、過負荷状態を解消したのち、開度制
御手段１４による開度制御に戻ってもよいことは言うま
でもない。Needless to say, it is possible to return to the opening control by the opening control means 14 after eliminating the overload condition.
【００１６】（実施例２）以下、請求項２に係わる発明
の多室用空気調和機の運転制御装置の一実施例について
説明する。なお、本実施例の構成を示す冷凍サイクル図
は図１と同じであり、詳細な説明を省略する。本実施例
が実施例１と異なる点は、開度補正手段１５の動作にあ
る。本実施例において、開度補正手段１５は、Ａ点で実
施例１同様の過負荷条件になった場合、図２に破線で示
したように、過熱度の設定値を７deg から２deg に変更
して設定する。開度制御手段１４は、この新たに設定さ
れた過熱度設定値を目標に電動膨張弁４を制御するの
で、図に破線で示したように、電動膨張弁４の開度は数
パルスずつ広がり、対応して過熱度も徐々に低下したの
ち安定する。このように高圧の上昇を抑制している。(Embodiment 2) An embodiment of the operation control device for a multi-room air conditioner of the invention according to claim 2 will be described below. The refrigeration cycle diagram showing the configuration of the present embodiment is the same as that in FIG. 1, and detailed description thereof will be omitted. The present embodiment differs from the first embodiment in the operation of the opening degree correction means 15. In the present embodiment, the opening degree correction means 15 changes the set value of the superheat degree from 7 deg to 2 deg as shown by the broken line in FIG. To set. Since the opening degree control means 14 controls the electric expansion valve 4 with this newly set superheat degree set value as a target, the opening degree of the electric expansion valve 4 widens by several pulses as shown by the broken line in the figure. Correspondingly, the superheat gradually decreases and then stabilizes. In this way, the rise in high pressure is suppressed.
【００１７】以上のように、本実施例の多室用空気調和
機の運転制御装置によれば、冷房運転時に室外気温が高
く、かつ圧縮機の運転周波数が所定値以上に高くなった
ときに、開度補正手段により過熱度の設定値を通常より
も下げた値に変えて設定し、変更した過熱度設定値のも
とに開度制御することにより、高圧の上がりすぎを防止
して、圧縮機を保護することができる。As described above, according to the operation control apparatus for a multi-room air conditioner of this embodiment, when the outdoor temperature is high during the cooling operation and the operating frequency of the compressor becomes higher than a predetermined value, By changing the set value of the superheat degree to a value lower than normal by the opening degree correction means and setting it, and by controlling the opening degree based on the changed superheat degree set value, it is possible to prevent the high pressure from rising too high. The compressor can be protected.
【００１８】なお、過負荷状態が解消したのち、通常の
過熱度設定値による開度制御に戻ってもよいことは言う
までもない。Needless to say, after the overload condition is eliminated, the opening degree control may be returned to the normal opening degree control value.
【００１９】（実施例３）以下、請求項３に係わる多室
用空気調和機の運転制御装置の一実施例について図面を
参照しながら説明する。なお、本実施例の構成を示す冷
凍サイクル図は図１と同じであり、詳細な説明を省略す
る。また、通常状態における動作についても説明を省略
する。実施例１および実施例２は冷房運転時に係わる動
作であるが、本実施例は暖房運転時における開度補正手
段１５の動作に係わる。図３における実線は、本実施例
における暖房時の電動膨張弁４の開度と低圧との関係を
経時変化で示す。通常運転においては、電動膨張弁４の
開度は、開度制御手段１４により過熱度が所定の設定値
になるよう制御され、安定する。いま、図におけるＢ点
で室外気温が低く、たとえば、４℃以下で、そのときの
圧縮機１の運転周波数が高い場合、たとえば圧縮機の運
転可能周波数が３０〜９０Hzであるとすると８０Hz以上
の条件であれば、開度制御手段１４による過熱度制御を
一時中止し、開度補正手段１５により、所定の開度、す
なわち膨張弁開度は液バックなど起こらず、かつ暖房能
力に著しい低下を及ぼさない開度に設定し、その状態で
運転する。その結果、図に実線で示したように、電動膨
張弁４による絞り過ぎがなくなり、低圧は急速に上昇す
る。したがって、室外側熱交換器２の着霜量増加を防止
でき、暖房能力の急激な低下を防止できる。(Embodiment 3) An embodiment of an operation control device for a multi-room air conditioner according to claim 3 will be described below with reference to the drawings. The refrigeration cycle diagram showing the configuration of the present embodiment is the same as that in FIG. 1, and detailed description thereof will be omitted. The description of the operation in the normal state is also omitted. Although the first and second embodiments relate to the operation during the cooling operation, the present embodiment relates to the operation of the opening degree correction unit 15 during the heating operation. The solid line in FIG. 3 shows the relationship between the opening degree of the electric expansion valve 4 and the low pressure during heating according to the present embodiment with a change over time. In normal operation, the opening degree of the electric expansion valve 4 is controlled by the opening degree control means 14 so that the degree of superheat becomes a predetermined set value, and is stabilized. Now, at the point B in the figure, when the outdoor temperature is low, for example, at 4 ° C. or lower and the operating frequency of the compressor 1 at that time is high, for example, assuming that the operable frequency of the compressor is 30 to 90 Hz, it becomes 80 Hz or more. If it is a condition, the degree of superheat control by the opening degree control means 14 is temporarily stopped, and the opening degree correction means 15 does not cause a liquid back at a predetermined opening degree, that is, the expansion valve opening degree, and significantly lowers the heating capacity. Set an opening that does not reach and operate in that state. As a result, as shown by the solid line in the figure, overthrottle by the electric expansion valve 4 is eliminated and the low pressure rises rapidly. Therefore, an increase in the amount of frost formed on the outdoor heat exchanger 2 can be prevented, and a rapid decrease in heating capacity can be prevented.
【００２０】以上のように、本実施例によれば、暖房運
転時に室外気温が所定値より低く、圧縮機の運転周波数
が所定値より高いとき、開度補正手段１５により電動膨
張弁の開度を所定値まで開くことにより、低圧が上昇し
て室外熱交換器の着霜増加を防止し、暖房能力の低下を
防止できる。As described above, according to this embodiment, when the outdoor air temperature is lower than the predetermined value and the operating frequency of the compressor is higher than the predetermined value during the heating operation, the opening correction means 15 opens the opening of the electric expansion valve. By opening to a predetermined value, it is possible to prevent the low pressure from rising and prevent an increase in frost formation on the outdoor heat exchanger, and prevent the heating capacity from decreasing.
【００２１】なお、着霜および暖房能力低下が解消した
のち、開度制御手段による制御に戻ってもよいことは言
うまでもない。Needless to say, the control by the opening control means may be returned to after the frosting and the reduction of the heating capacity are eliminated.
【００２２】（実施例４）以下、請求項４に係わる発明
の一実施例について図面を参照しながら説明する。な
お、本実施例の構成を示す冷凍サイクル図は図１と同じ
であり、詳細な説明を省略する。また、通常状態におけ
る動作についても説明を省略する。本実施例が実施例３
と異なる点は、開度補正手段１５の動作にある。図３に
おける破線は、本実施例における電動膨張弁４の開度と
低圧との関係を経時変化で示す。Ｂ点で実施例３と同様
の低温条件になった場合、開度補正手段１５により過熱
度の設定値を最初の設定値７deg から２deg に変更し、
開度制御手段１４により新たな過熱度設定値に従って制
御することにより、電動膨張弁４の開度は数パルスずつ
広がり、低圧の低下を防止でき、前記同様に暖房能力の
著しい低下を防止している。(Embodiment 4) An embodiment of the invention according to claim 4 will be described below with reference to the drawings. The refrigeration cycle diagram showing the configuration of the present embodiment is the same as that in FIG. 1, and detailed description thereof will be omitted. The description of the operation in the normal state is also omitted. This embodiment is the third embodiment.
The difference is in the operation of the opening degree correction means 15. The broken line in FIG. 3 shows the relationship between the opening degree of the electric expansion valve 4 and the low pressure in this embodiment as a function of time. When the low temperature condition similar to that of the third embodiment is obtained at the point B, the opening correction means 15 changes the set value of the superheat degree from the first set value of 7 deg to 2 deg.
By controlling according to the new superheat degree set value by the opening degree control means 14, the opening degree of the electric expansion valve 4 is expanded by several pulses, a decrease in low pressure can be prevented, and a significant decrease in heating capacity can be prevented as described above. There is.
【００２３】以上のように、本実施例によれば、暖房運
転時に室外気温が所定値より低く、かつ圧縮機の運転周
波数が所定値より高いとき、開度補正手段により過熱度
設定値を下げて設定することにより、低圧の低下による
暖房能力の低下を防止できる。As described above, according to this embodiment, when the outdoor air temperature is lower than the predetermined value and the operating frequency of the compressor is higher than the predetermined value during the heating operation, the opening degree correcting means lowers the superheat degree setting value. By setting the above, it is possible to prevent a decrease in heating capacity due to a decrease in low pressure.
【００２４】（実施例５）以下、請求項５および請求項
６に係わる発明の一実施例にについて図面を参照しなが
ら説明する。なお、本実施例の構成を示す冷凍サイクル
図は図１と同じであり、詳細な説明を省略するが、本実
施例においては、初期開度設定手段１６により運転開始
時の電動膨張弁の開度を設定している。図２に一点鎖線
で示した電動膨張弁の開度変化は、運転開始時の初期開
度を圧縮機の運転周波数をパラメータとして変更したこ
とにより、冷凍サイクルが安定するまでの時間を従来よ
り短縮されて、△ｔが△ｔ’になる状況を示す。図４
は、このように初期開度を圧縮機の運転周波数により変
える場合の関係を示す特性図である。図に示したよう
に、運転周波数が高いほど安定時の膨張弁開度が大きい
ことを考慮して、運転周波数に対応して初期開度を大き
くしている。(Embodiment 5) An embodiment of the invention according to claims 5 and 6 will be described below with reference to the drawings. The refrigeration cycle diagram showing the configuration of the present embodiment is the same as that of FIG. 1, and detailed description thereof will be omitted. However, in the present embodiment, the initial opening setting means 16 opens the electric expansion valve at the start of operation. The degree is set. The opening change of the electric expansion valve shown by the alternate long and short dash line in Fig. 2 is shorter than before by stabilizing the refrigeration cycle by changing the initial opening at the start of operation using the operating frequency of the compressor as a parameter. In this case, Δt becomes Δt ′. FIG.
FIG. 6 is a characteristic diagram showing a relationship when the initial opening degree is changed according to the operating frequency of the compressor in this way. As shown in the figure, in consideration of the fact that the higher the operating frequency is, the larger the opening degree of the expansion valve at the time of stability is, the initial opening degree is increased corresponding to the operating frequency.
【００２５】以上のように、本実施例によれば、初期開
度設定手段により、電動膨張弁の初期開度を圧縮機の運
転周波数に対応して変え、運転周波数が高いほど初期開
度を大きく設定することにより、冷凍サイクルが安定す
るまでの時間を短縮でき、空気調和機としての機能が向
上する。As described above, according to this embodiment, the initial opening degree setting means changes the initial opening degree of the electric expansion valve in accordance with the operating frequency of the compressor. By setting a large value, the time until the refrigeration cycle stabilizes can be shortened and the function as an air conditioner improves.
【００２６】（実施例６）以下、請求項５および請求項
７に係わる発明の一実施例について説明する。本実施例
が実施例５と異なる点は、初期開度設定手段１６が、室
外気温により電動膨張弁の初期開度を設定することにあ
る。図５は本実施例における室外気温と初期開度との関
係を示す特性図である。室外気温が高いほど過熱度がと
れ易いため、初期開度を大きくして、冷凍サイクルの安
定までの時間を短くすることができる。(Embodiment 6) An embodiment of the invention according to claims 5 and 7 will be described below. The present embodiment differs from the fifth embodiment in that the initial opening setting means 16 sets the initial opening of the electric expansion valve according to the outdoor temperature. FIG. 5 is a characteristic diagram showing the relationship between the outdoor temperature and the initial opening in this embodiment. Since the higher the outdoor temperature, the higher the degree of superheat, the initial opening can be increased and the time required for the refrigeration cycle to stabilize can be shortened.
【００２７】以上のように、本実施例によれば、初期開
度設定手段１６により、電動膨張弁の初期開度に対応し
て変え、室外気温が高いほど初期開度を大きく設定する
ことにより、冷凍サイクルが安定するまでの時間を短縮
でき、空気調和機としての機能が向上する。As described above, according to this embodiment, the initial opening degree setting means 16 changes the initial opening degree of the electric expansion valve so that the higher the outdoor temperature is, the larger the initial opening degree is set. The time until the refrigeration cycle stabilizes can be shortened and the function as an air conditioner improves.
【００２８】（実施例７）以下、請求項５および請求項
８に係わる発明の一実施例について説明する。本実施例
が実施例５および６と異なる点は、初期開度設定手段１
６が、圧縮機の運転周波数と室外気温との２つの要素に
より電動膨張弁の初期開度を設定していることにある。
図６は、その関係を示す特性図である。実施例５と実施
例６で説明したように、圧縮機の運転周波数と室外気温
のいずれに対しても電動膨張弁の初期開度を大きく設定
できたのに基づき、本実施例においては、圧縮機の周波
数と室外気温とが高いほど電動膨張弁の初期開度を大き
く設定するようにし、運転周波数と室外気温とによる範
囲をブロックに分割し、その各ブロックに対し初期開度
を割り付けて設定することにより、さらに冷凍サイクル
安定までの時間を短くできる。(Embodiment 7) An embodiment of the invention according to claims 5 and 8 will be described below. This embodiment is different from the fifth and sixth embodiments in that the initial opening setting means 1
6 is that the initial opening degree of the electric expansion valve is set by the two factors of the operating frequency of the compressor and the outdoor temperature.
FIG. 6 is a characteristic diagram showing the relationship. As described in the fifth and sixth embodiments, the initial opening degree of the electric expansion valve can be set large for both the operating frequency of the compressor and the outdoor temperature. The higher the machine frequency and the outdoor temperature, the larger the initial opening of the electric expansion valve is set.The range of the operating frequency and the outdoor temperature is divided into blocks, and the initial opening is assigned to each block. By doing so, the time until the refrigeration cycle stabilizes can be further shortened.
【００２９】以上のように、本実施例によれば、初期開
度設定手段１６により電動膨張弁の初期開度を、圧縮機
の運転周波数と室外気温とに対応して変え、両者が高い
ほど初期開度を大きく設定することにより、冷凍サイク
ルが安定するまでの時間を、より短縮できる。As described above, according to this embodiment, the initial opening degree setting means 16 changes the initial opening degree of the electric expansion valve in accordance with the operating frequency of the compressor and the outdoor temperature. By setting a large initial opening, the time until the refrigeration cycle stabilizes can be further shortened.
【００３０】（実施例８）以下、請求項５および請求項
７に係わる発明の一実施例について説明する。本実施例
においては、初期開度設定手段１６は、接続されている
室内ユニットの総台数に対応して電動膨張弁の初期開度
を決定している。図７は本実施例における室内ユニット
の総台数と電動膨張弁の初期開度との関係を示す特性図
である。室内ユニットの接続台数が少ない場合は、冷凍
サイクル中の冷媒量は過多気味になり、過熱度を達成し
にくく、冷凍サイクルが安定したときの膨張弁開度は小
さくなることに基づいて、初期開度も小さく設定するこ
とにより、室内機の設置状況に関わらず、冷凍サイクル
の安定を早めることができる。(Embodiment 8) An embodiment of the invention according to claims 5 and 7 will be described below. In the present embodiment, the initial opening degree setting means 16 determines the initial opening degree of the electric expansion valve in accordance with the total number of connected indoor units. FIG. 7 is a characteristic diagram showing the relationship between the total number of indoor units and the initial opening of the electric expansion valve in this embodiment. When the number of connected indoor units is small, the amount of refrigerant in the refrigeration cycle becomes excessive, it is difficult to achieve superheat, and the expansion valve opening becomes small when the refrigeration cycle stabilizes. By setting the degree small, the stability of the refrigeration cycle can be accelerated regardless of the installation condition of the indoor unit.
【００３１】以上のように、本実施例によれば、初期開
度設定手段１６により電動膨張弁の初期開度を、室内ユ
ニットの総台数に対応して変え、総台数が少ないほど電
動膨張弁の初期開度を小さく設定することにより、冷凍
サイクルが安定するまでの時間を短縮できる。As described above, according to this embodiment, the initial opening setting means 16 changes the initial opening of the electric expansion valve in accordance with the total number of indoor units. By setting the initial opening degree of 2 small, the time until the refrigeration cycle stabilizes can be shortened.
【００３２】[0032]
【発明の効果】以上の実施例から明らかなように、請求
項１に係わる発明は、圧縮機、室外熱交換器、室外ファ
ン、四方弁、および液側主管に設けた電動膨張弁などか
らなる室外ユニットに、冷媒分岐ユニットを介して、ま
たは直接に、室内熱交換器および送風機などからなる室
内ユニットを複数台接続して冷凍サイクルを構成し、前
記圧縮機の吸入冷媒温度と低圧の圧力飽和相当温度とを
検出し、その温度差、すなわち前記圧縮機の吸入冷媒の
過熱度が、所定の設定値になるように前記電動膨張弁の
開度を制御する開度制御手段を備えた多室用空気調和機
において、冷房運転時に室外気温が所定値より高く、か
つ前記圧縮機の運転周波数が所定値より高い場合に、前
記開度制御手段の制御を無効にするとともに、前記電動
膨張弁の開度を所定の開度に設定する開度補正手段を備
えたことにより、冷房過負荷運転時に発生する過熱し過
ぎと高圧とを抑制して圧縮機を保護でき、また、請求項
２に係わる発明は、圧縮機、室外熱交換器、室外ファ
ン、四方弁、および液側主管に設けた電動膨張弁などか
らなる室外ユニットに、冷媒分岐ユニットを介して、ま
たは直接に、室内熱交換器および送風機などからなる室
内ユニットを複数台接続して冷凍サイクルを構成し、前
記圧縮機の吸入冷媒温度と低圧の圧力飽和相当温度とを
検出し、その温度差、すなわち前記圧縮機の吸入冷媒の
過熱度が、所定の第１の設定値になるように前記電動膨
張弁の開度を制御する開度制御手段を備えた多室用空気
調和機において、冷房運転時に室外気温が所定値より高
く、かつ前記圧縮機の運転周波数が所定値より高い場合
に、前記過熱度設定値を、前記第１の設定値よりも低い
第２の所定の設定値に変える開度補正手段を備えたこと
により、冷房過負荷運転時に発生する過熱し過ぎと高圧
とを抑制して圧縮機を保護でき、また、請求項３に係わ
る発明は、圧縮機、室外熱交換器、室外ファン、四方
弁、および液側主管に設けた電動膨張弁などからなる室
外ユニットに、冷媒分岐ユニットを介して、または直接
に、室内熱交換器および送風機などからなる室内ユニッ
トを複数台接続して冷凍サイクルを構成し、前記圧縮機
の吸入冷媒温度と低圧の圧力飽和相当温度とを検出し、
その温度差、すなわち前記圧縮機の吸入冷媒の過熱度
が、所定の設定値になるように前記電動膨張弁の開度を
制御する開度制御手段を備えた多室用空気調和機におい
て、暖房運転時に室外気温が所定値より低く、かつ圧縮
機の運転周波数が所定値より高い場合、前記開度制御手
段の制御を無効にするとともに、前記電動膨張弁の開度
を所定の開度に設定する開度補正手段を備えたことによ
り、低圧の下がり過ぎと暖房能力の低下を抑制でき、ま
た、請求項４に係わる発明は、圧縮機、室外熱交換器、
室外ファン、四方弁、および液側主管に設けた電動膨張
弁などからなる室外ユニットに、冷媒分岐ユニットを介
して、または直接に、室内熱交換器および送風機などか
らなる室内ユニットを複数台接続して冷凍サイクルを構
成し、前記圧縮機の吸入冷媒温度と低圧の圧力飽和相当
温度とを検出し、その温度差、すなわち前記圧縮機の吸
入冷媒の過熱度が、所定の第１の設定値になるように前
記電動膨張弁の開度を制御する開度制御手段を備えた多
室用空気調和機において、暖房運転時に室外気温が所定
値より低く、かつ圧縮機の運転周波数が所定値より高い
場合に、前記開度制御手段を無効として、前記過熱度設
定値を、前記第１の設定値よりも低い第２の所定の設定
値に変える開度補正手段を備えたことにより、低圧の下
がり過ぎと暖房能力の低下を抑制でき、また、請求項５
ないし請求項８に係わる発明は、圧縮機、室外熱交換
器、室外ファン、四方弁、および液側主管に設けた電動
膨張弁などからなる室外ユニットに、冷媒分岐ユニット
を介して、または直接に、室内熱交換器および送風機な
どからなる室内ユニットを複数台接続して冷凍サイクル
を構成し、前記圧縮機の吸入冷媒温度と低圧の圧力飽和
相当温度とを検出し、その温度差、すなわち前記圧縮機
の吸入冷媒の過熱度が、所定の設定値になるように前記
電動膨張弁の開度を制御する開度制御手段を備えた多室
用空気調和機において、運転開始時の前記電動膨張弁の
最初の開度を設定する初期開度設定手段を設け、前記初
期開度設定手段は、運転開始時の条件に基づいて電動膨
張弁の初期開度を決定するようにしたことにより、電動
膨張弁の初期開度を、圧縮機の運転周波数、室外気温、
または接続された室内ユニットの総台数をパラメータと
して設定し、冷凍サイクルが安定するまでの時間を運転
状況に対応して短縮でき、快適性の向上を図ることがで
きる。As is apparent from the above embodiments, the invention according to claim 1 comprises a compressor, an outdoor heat exchanger, an outdoor fan, a four-way valve, and an electric expansion valve provided in the liquid side main pipe. A refrigeration cycle is configured by connecting a plurality of indoor units including an indoor heat exchanger and a blower to an outdoor unit via a refrigerant branching unit or directly to construct a refrigeration cycle, and the suction refrigerant temperature of the compressor and low pressure saturation. A multi-chamber having an opening control means for detecting an equivalent temperature and controlling the opening of the electric expansion valve so that the temperature difference, that is, the degree of superheat of the refrigerant sucked into the compressor becomes a predetermined set value. In the air conditioner for use, when the outdoor air temperature is higher than a predetermined value during the cooling operation and the operating frequency of the compressor is higher than the predetermined value, the control of the opening control means is invalidated, and the electric expansion valve Opening By providing the opening correction means for setting the opening of the compressor, it is possible to protect the compressor by suppressing overheating and high pressure that occur during cooling overload operation, and the invention according to claim 2 , An outdoor heat exchanger, an outdoor fan, a four-way valve, and an outdoor expansion unit such as an electric expansion valve provided on the liquid side main pipe, and an indoor heat exchanger and a blower through a refrigerant branch unit or directly. A plurality of indoor units are connected to form a refrigeration cycle, and a suction refrigerant temperature of the compressor and a low pressure equivalent pressure saturation temperature are detected, and the temperature difference, that is, the superheat degree of the suction refrigerant of the compressor is a predetermined value. In a multi-room air conditioner equipped with an opening control means for controlling the opening of the electric expansion valve so that the opening temperature of the electric expansion valve is adjusted to the first set value, the outdoor temperature is higher than a predetermined value during cooling operation, and the compressor is The operating frequency of If it is higher than the value, the opening degree correction means for changing the superheat degree set value to the second predetermined set value lower than the first set value is provided, so that the overheat generated during the cooling overload operation can be prevented. The invention according to claim 3 can protect the compressor by suppressing excessive pressure and high pressure. Further, the invention according to claim 3 includes a compressor, an outdoor heat exchanger, an outdoor fan, a four-way valve, and an electric expansion valve provided in a liquid side main pipe. A plurality of indoor units including an indoor heat exchanger and a blower are connected to an outdoor unit consisting of a refrigerant branching unit or directly to form a refrigeration cycle, and the refrigerant refrigerant suction pressure and low pressure The temperature equivalent to saturation is detected,
The temperature difference, that is, the degree of superheat of the refrigerant sucked into the compressor, in a multi-room air conditioner equipped with an opening control means for controlling the opening of the electric expansion valve so as to reach a predetermined set value, When the outdoor temperature is lower than a predetermined value and the operating frequency of the compressor is higher than the predetermined value during operation, the control of the opening control means is disabled and the opening of the electric expansion valve is set to the predetermined opening. By providing the opening degree correction means for controlling, it is possible to suppress an excessive decrease in low pressure and a decrease in heating capacity. Further, the invention according to claim 4 is a compressor, an outdoor heat exchanger,
Connect multiple indoor units such as an indoor heat exchanger and blower to an outdoor unit consisting of an outdoor fan, a four-way valve, and an electric expansion valve installed in the liquid side main pipe, or directly via a refrigerant branching unit. A refrigerating cycle is configured to detect a refrigerant suction temperature of the compressor and a low pressure equivalent pressure saturation temperature, and the temperature difference, that is, the degree of superheat of the refrigerant suction of the compressor becomes a predetermined first set value. In the multi-room air conditioner having the opening control means for controlling the opening of the electric expansion valve so that the outdoor air temperature is lower than a predetermined value during the heating operation, and the operating frequency of the compressor is higher than the predetermined value. In this case, when the opening degree control means is disabled and the opening degree correction means for changing the superheat degree set value to the second predetermined set value lower than the first set value is provided, the low pressure is lowered. Passage and heating capacity Can the decrease in inhibition, also claim 5
The invention according to claim 8 is to an outdoor unit including a compressor, an outdoor heat exchanger, an outdoor fan, a four-way valve, and an electric expansion valve provided in a liquid side main pipe, via a refrigerant branching unit or directly. , A plurality of indoor units including an indoor heat exchanger and a blower are connected to form a refrigeration cycle, and a suction refrigerant temperature of the compressor and a pressure saturation equivalent temperature of low pressure are detected, and the temperature difference, that is, the compression In a multi-room air conditioner having an opening control means for controlling the opening of the electric expansion valve so that the degree of superheat of the refrigerant sucked into the machine becomes a predetermined set value, the electric expansion valve at the start of operation. By providing an initial opening setting means for setting the initial opening of the electric expansion valve, the initial opening setting means determines the initial opening of the electric expansion valve based on the condition at the start of operation. The initial opening of the valve Operating frequency, the outdoor air temperature of the compressor,
Alternatively, the total number of connected indoor units can be set as a parameter, and the time until the refrigeration cycle stabilizes can be shortened according to the operating condition, and the comfort can be improved.
【図１】本発明における多室用空気調和機の一実施例の
構成を示す冷凍サイクル図FIG. 1 is a refrigeration cycle diagram showing a configuration of an embodiment of a multi-room air conditioner according to the present invention.
【図２】本発明の多室用空気調和機の運転制御装置の一
実施例における冷房時の電動膨張弁の開度と過熱度との
関係を経時変化で示す特性図FIG. 2 is a characteristic diagram showing the relationship between the degree of opening and the degree of superheat of the electric expansion valve during cooling in one embodiment of the operation control device for a multi-room air conditioner according to the present invention, as a function of time.
【図３】本発明の多室用空気調和機の運転制御装置の一
実施例における暖房時の電動膨張弁の開度と低圧との関
係を経時変化で示す特性図FIG. 3 is a characteristic diagram showing the relationship between the opening degree of the electric expansion valve and the low pressure during heating in one embodiment of the operation control device for a multi-room air conditioner of the present invention, as a function of time.
【図４】本発明の多室用空気調和機の運転制御装置の一
実施例における圧縮機の運転周波数と電動膨張弁の初期
開度との関係を示す特性図FIG. 4 is a characteristic diagram showing the relationship between the operating frequency of the compressor and the initial opening degree of the electric expansion valve in the embodiment of the operation control device for the multi-room air conditioner of the present invention.
【図５】本発明の多室用空気調和機の運転制御装置の一
実施例における室外気温と電動膨張弁の初期開度との関
係を示す特性図FIG. 5 is a characteristic diagram showing the relationship between the outdoor temperature and the initial opening degree of the electric expansion valve in an embodiment of the operation control device for a multi-room air conditioner of the present invention.
【図６】本発明の多室用空気調和機の運転制御装置の一
実施例における圧縮機の運転周波数および室外気温と電
動膨張弁の初期開度との関係を示す特性図FIG. 6 is a characteristic diagram showing the relationship between the operating frequency of the compressor, the outdoor air temperature, and the initial opening of the electric expansion valve in the embodiment of the operation control device for a multi-room air conditioner of the present invention.
【図７】本発明の多室用空気調和機の運転制御装置の一
実施例における室内ユニットの総台数と電動膨張弁の初
期開度との関係を示す特性図FIG. 7 is a characteristic diagram showing a relationship between the total number of indoor units and the initial opening degree of the electric expansion valve in the embodiment of the operation control device for the multi-room air conditioner of the present invention.
Ｘ 室外ユニット Ｙ１、Ｙ２ 分岐ユニット Ａ〜Ｆ 室内ユニット １ 圧縮機 ２ 室外側熱交換器 ３ 四方弁 ４ 電動膨張弁 ５、６ 接続配管 ８ａ〜８ｆ 室内側熱交換器 １０ 吸入配管 １２、１３ 温度センサ １４ 開度制御手段（運転制御装置） １５ 開度補正手段（運転制御装置） １６ 初期開度設定手段（運転制御装置） X outdoor unit Y1, Y2 branch unit A to F indoor unit 1 compressor 2 outdoor heat exchanger 3 four-way valve 4 electric expansion valve 5, 6 connection pipe 8a to 8f indoor heat exchanger 10 intake pipe 12, 13 temperature sensor 14 Opening control means (operation control device) 15 Opening correction means (operation control device) 16 Initial opening setting means (operation control device)
Claims (9)
方弁、および液側主管に設けた電動膨張弁などからなる
室外ユニットに、冷媒分岐ユニットを介して、または直
接に、室内熱交換器および送風機などからなる室内ユニ
ットを複数台接続して冷凍サイクルを構成し、前記圧縮
機の吸入冷媒温度と低圧の圧力飽和相当温度とを検出
し、その温度差、すなわち前記圧縮機の吸入冷媒の過熱
度が、所定の設定値になるように前記電動膨張弁の開度
を制御する開度制御手段を備えた多室用空気調和機にお
いて、冷房運転時に室外気温が所定値より高く、かつ前
記圧縮機の運転周波数が所定値より高い場合に、前記開
度制御手段の制御を無効にするとともに、前記電動膨張
弁の開度を所定の開度に設定する開度補正手段を備えた
多室用空気調和機の運転制御装置。1. Indoor heat exchange to an outdoor unit including a compressor, an outdoor heat exchanger, an outdoor fan, a four-way valve, and an electric expansion valve provided in a liquid side main pipe, through a refrigerant branch unit or directly. A plurality of indoor units such as an air conditioner and a blower are connected to form a refrigerating cycle, and a refrigerant suction temperature of the compressor and a pressure saturation equivalent temperature of low pressure are detected, and a temperature difference between them, that is, a refrigerant suction of the compressor. In the multi-room air conditioner having an opening degree control means for controlling the opening degree of the electric expansion valve so that the degree of superheat of the electric expansion valve becomes a predetermined set value, the outdoor air temperature is higher than the predetermined value during the cooling operation, and When the operating frequency of the compressor is higher than a predetermined value, the control of the opening control means is invalidated, and an opening correction means for setting the opening of the electric expansion valve to a predetermined opening is provided. Room air conditioner luck Rolling control device.
方弁、および液側主管に設けた電動膨張弁などからなる
室外ユニットに、冷媒分岐ユニットを介して、または直
接に、室内熱交換器および送風機などからなる室内ユニ
ットを複数台接続して冷凍サイクルを構成し、前記圧縮
機の吸入冷媒温度と低圧の圧力飽和相当温度とを検出
し、その温度差、すなわち前記圧縮機の吸入冷媒の過熱
度が、所定の第１の設定値になるように前記電動膨張弁
の開度を制御する開度制御手段を備えた多室用空気調和
機において、冷房運転時に室外気温が所定値より高く、
かつ前記圧縮機の運転周波数が所定値より高い場合に、
前記過熱度設定値を、前記第１の設定値よりも低い第２
の所定の設定値に変える開度補正手段を備えた多室用空
気調和機の運転制御装置。2. Indoor heat exchange to a outdoor unit including a compressor, an outdoor heat exchanger, an outdoor fan, a four-way valve, and an electric expansion valve provided in a liquid side main pipe, via a refrigerant branch unit or directly. A plurality of indoor units such as an air conditioner and a blower are connected to form a refrigerating cycle, and a refrigerant suction temperature of the compressor and a pressure saturation equivalent temperature of low pressure are detected, and a temperature difference between them, that is, a refrigerant suction of the compressor. In a multi-room air conditioner equipped with an opening control means for controlling the opening of the electric expansion valve so that the superheat degree of is equal to a predetermined first set value, the outdoor air temperature is lower than the predetermined value during the cooling operation. high,
And when the operating frequency of the compressor is higher than a predetermined value,
The superheat degree set value is set to a second value lower than the first set value.
An operation control device for a multi-room air conditioner, comprising an opening degree correction means for changing the setting value to a predetermined set value.
方弁、および液側主管に設けた電動膨張弁などからなる
室外ユニットに、冷媒分岐ユニットを介して、または直
接に、室内熱交換器および送風機などからなる室内ユニ
ットを複数台接続して冷凍サイクルを構成し、前記圧縮
機の吸入冷媒温度と低圧の圧力飽和相当温度とを検出
し、その温度差、すなわち前記圧縮機の吸入冷媒の過熱
度が、所定の設定値になるように前記電動膨張弁の開度
を制御する開度制御手段を備えた多室用空気調和機にお
いて、暖房運転時に室外気温が所定値より低く、かつ圧
縮機の運転周波数が所定値より高い場合、前記開度制御
手段の制御を無効にするとともに、前記電動膨張弁の開
度を所定の開度に設定する開度補正手段を備えた多室用
空気調和機の運転制御装置。3. The indoor heat exchange to an outdoor unit including a compressor, an outdoor heat exchanger, an outdoor fan, a four-way valve, and an electric expansion valve provided in a liquid side main pipe, through a refrigerant branch unit or directly. A plurality of indoor units such as an air conditioner and a blower are connected to form a refrigerating cycle, and a refrigerant suction temperature of the compressor and a pressure saturation equivalent temperature of low pressure are detected, and a temperature difference between them, that is, a refrigerant suction of the compressor. In the multi-room air conditioner having an opening control means for controlling the opening of the electric expansion valve so that the degree of superheat of the electric expansion valve becomes a predetermined set value, the outdoor air temperature is lower than the predetermined value during the heating operation, and When the operating frequency of the compressor is higher than a predetermined value, the control of the opening control means is invalidated, and the opening degree correction means for setting the opening degree of the electric expansion valve to a predetermined opening degree is provided for the multi-chamber use. Air conditioner operation control apparatus.
方弁、および液側主管に設けた電動膨張弁などからなる
室外ユニットに、冷媒分岐ユニットを介して、または直
接に、室内熱交換器および送風機などからなる室内ユニ
ットを複数台接続して冷凍サイクルを構成し、前記圧縮
機の吸入冷媒温度と低圧の圧力飽和相当温度とを検出
し、その温度差、すなわち前記圧縮機の吸入冷媒の過熱
度が、所定の第１の設定値になるように前記電動膨張弁
の開度を制御する開度制御手段を備えた多室用空気調和
機において、暖房運転時に室外気温が所定値より低く、
かつ圧縮機の運転周波数が所定値より高い場合に、前記
開度制御手段を無効として、前記過熱度設定値を、前記
第１の設定値よりも低い第２の所定の設定値に変える開
度補正手段を備えた多室用空気調和機の運転制御装置。4. Indoor heat exchange to a outdoor unit including a compressor, an outdoor heat exchanger, an outdoor fan, a four-way valve, and an electric expansion valve provided in a liquid side main pipe, through a refrigerant branch unit or directly. A plurality of indoor units such as an air conditioner and a blower are connected to form a refrigerating cycle, and a refrigerant suction temperature of the compressor and a pressure saturation equivalent temperature of low pressure are detected, and a temperature difference between them, that is, a refrigerant suction of the compressor. In a multi-room air conditioner equipped with opening control means for controlling the opening of the electric expansion valve so that the degree of superheat of the electric expansion valve becomes a predetermined first set value, the outdoor air temperature is higher than a predetermined value during heating operation. Low,
In addition, when the operating frequency of the compressor is higher than a predetermined value, the opening degree control means is disabled and the degree of superheat setting value is changed to a second predetermined setting value lower than the first setting value. An operation control device for a multi-room air conditioner having a correction means.
方弁、および液側主管に設けた電動膨張弁などからなる
室外ユニットに、冷媒分岐ユニットを介して、または直
接に、室内熱交換器および送風機などからなる室内ユニ
ットを複数台接続して冷凍サイクルを構成し、前記圧縮
機の吸入冷媒温度と低圧の圧力飽和相当温度とを検出
し、その温度差、すなわち前記圧縮機の吸入冷媒の過熱
度が、所定の設定値になるように前記電動膨張弁の開度
を制御する開度制御手段を備えた多室用空気調和機にお
いて、運転開始時の前記電動膨張弁の最初の開度を設定
する初期開度設定手段を設け、前記初期開度設定手段
は、運転開始時の条件に基づいて電動膨張弁の初期開度
を決定するようにした多室用空気調和機の運転制御装
置。5. Indoor heat exchange to a outdoor unit including a compressor, an outdoor heat exchanger, an outdoor fan, a four-way valve, an electric expansion valve provided in a liquid side main pipe, etc. via a refrigerant branch unit or directly. A plurality of indoor units such as an air conditioner and a blower are connected to form a refrigerating cycle, and a refrigerant suction temperature of the compressor and a pressure saturation equivalent temperature of low pressure are detected, and a temperature difference between them, that is, a refrigerant suction of the compressor. In a multi-room air conditioner having an opening control means for controlling the opening of the electric expansion valve so that the degree of superheat of the electric expansion valve becomes a predetermined set value, the first opening of the electric expansion valve at the start of operation. Control means for the multi-room air conditioner, in which an initial opening degree setting means for setting the degree of opening is provided, and the initial opening degree setting means determines the initial opening degree of the electric expansion valve based on the condition at the time of starting operation. apparatus.
数により電動膨張弁の開度を決定するようにした請求項
５記載の多室用空気調和機の運転制御装置。6. The operation control device for a multi-room air conditioner according to claim 5, wherein the initial opening setting means determines the opening of the electric expansion valve according to the operating frequency of the compressor.
電動膨張弁の初期を決定するようにした請求項５記載の
多室用空気調和機の運転制御装置。7. The operation control device for a multi-room air conditioner according to claim 5, wherein the initial opening setting means determines the initial stage of the electric expansion valve according to the outdoor temperature.
数と室外気温との２つの要素に従って電動膨張弁の初期
開度を決定するようにした請求項５記載の多室用空気調
和機の運転制御装置。8. The multi-room air conditioner according to claim 5, wherein the initial opening setting means determines the initial opening of the electric expansion valve according to two factors of the operating frequency of the compressor and the outdoor temperature. Operation control device.
内ユニットの総台数に従って電動膨張弁の初期開度を決
定するようにした請求項５記載の多室用空気調和機の運
転制御装置。9. The operation control device for a multi-room air conditioner according to claim 5, wherein the initial opening setting means determines the initial opening of the electric expansion valve according to the total number of connected indoor units. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03031995A JP3458293B2 (en) | 1995-02-20 | 1995-02-20 | Operation control device for multi-room air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03031995A JP3458293B2 (en) | 1995-02-20 | 1995-02-20 | Operation control device for multi-room air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08226721A true JPH08226721A (en) | 1996-09-03 |
| JP3458293B2 JP3458293B2 (en) | 2003-10-20 |
Family
ID=12300485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03031995A Expired - Fee Related JP3458293B2 (en) | 1995-02-20 | 1995-02-20 | Operation control device for multi-room air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3458293B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10238899A (en) * | 1997-02-28 | 1998-09-08 | Sanyo Electric Co Ltd | Air conditioner |
| JP2009068744A (en) * | 2007-09-12 | 2009-04-02 | Mitsubishi Heavy Ind Ltd | Valve opening pulse setting method for electric expansion valve and multiple air conditioner |
| JP2011106695A (en) * | 2009-11-13 | 2011-06-02 | Mitsubishi Electric Corp | Air conditioning device |
| JP2013178058A (en) * | 2012-02-29 | 2013-09-09 | Hitachi Appliances Inc | Air conditioner |
| WO2016136979A1 (en) * | 2015-02-27 | 2016-09-01 | 東芝キヤリア株式会社 | Refrigeration cycle device |
| WO2017008554A1 (en) * | 2015-07-16 | 2017-01-19 | 广东美的暖通设备有限公司 | Multi-split system and control method for electronic expansion valve thereof |
| CN108895567A (en) * | 2018-03-21 | 2018-11-27 | 青岛海信日立空调系统有限公司 | Outdoor unit, multi-line system and control method, device, computer storage medium |
| CN111520869A (en) * | 2020-05-25 | 2020-08-11 | 广东志高暖通设备股份有限公司 | Accurate refrigerant distribution control method for indoor unit of multi-split system |
-
1995
- 1995-02-20 JP JP03031995A patent/JP3458293B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10238899A (en) * | 1997-02-28 | 1998-09-08 | Sanyo Electric Co Ltd | Air conditioner |
| JP2009068744A (en) * | 2007-09-12 | 2009-04-02 | Mitsubishi Heavy Ind Ltd | Valve opening pulse setting method for electric expansion valve and multiple air conditioner |
| JP2011106695A (en) * | 2009-11-13 | 2011-06-02 | Mitsubishi Electric Corp | Air conditioning device |
| JP2013178058A (en) * | 2012-02-29 | 2013-09-09 | Hitachi Appliances Inc | Air conditioner |
| WO2016136979A1 (en) * | 2015-02-27 | 2016-09-01 | 東芝キヤリア株式会社 | Refrigeration cycle device |
| WO2017008554A1 (en) * | 2015-07-16 | 2017-01-19 | 广东美的暖通设备有限公司 | Multi-split system and control method for electronic expansion valve thereof |
| US10126029B2 (en) | 2015-07-16 | 2018-11-13 | Gd Midea Heating & Ventilating Equipment Co., Ltd. | Variable refrigerant flow air conditioning system and method for controlling electronic expansion valve thereof |
| CN108895567A (en) * | 2018-03-21 | 2018-11-27 | 青岛海信日立空调系统有限公司 | Outdoor unit, multi-line system and control method, device, computer storage medium |
| CN111520869A (en) * | 2020-05-25 | 2020-08-11 | 广东志高暖通设备股份有限公司 | Accurate refrigerant distribution control method for indoor unit of multi-split system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3458293B2 (en) | 2003-10-20 |
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