JPH1047797A - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JPH1047797A JPH1047797A JP8198729A JP19872996A JPH1047797A JP H1047797 A JPH1047797 A JP H1047797A JP 8198729 A JP8198729 A JP 8198729A JP 19872996 A JP19872996 A JP 19872996A JP H1047797 A JPH1047797 A JP H1047797A
- Authority
- JP
- Japan
- Prior art keywords
- sealing valve
- outdoor
- compressor
- pressure
- detecting means
- 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.)
- Pending
Links
Landscapes
- Air Conditioning Control Device (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、空気調和機に係わ
り、特に低外機温冷房運転に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner and, more particularly, to a low-temperature outdoor air conditioner.
【0002】[0002]
【従来の技術】従来、この種の多室型空気調和機とし
て、例えば、特開平8−5184号公報に掲載されたも
のがある。2. Description of the Related Art Conventionally, as this kind of multi-room type air conditioner, for example, there is one disclosed in Japanese Patent Application Laid-Open No. 8-5184.
【0003】以下、図10を参照しながら従来の多室型
空気調和機について説明する。図10は従来の多室型空
気調和機の冷凍サイクル図を示すものである。図10に
おいて、1は多室型空気調和機の室外機で、圧縮機2、
四方弁3、室外側熱交換器11、室外側膨脹弁12によ
り構成される。8は室内機で、それぞれ、室内側膨脹弁
9、室内側熱交換器10よりなり、室外機1に液管6、
ガス管7により並列に配管接続されている。また、4は
圧縮機2の高圧側に設けられた吐出圧力検出手段で、5
は室外側膨脹弁12を制御する室外電動膨脹弁コントロ
ーラとなっている。Hereinafter, a conventional multi-room air conditioner will be described with reference to FIG. FIG. 10 shows a refrigeration cycle diagram of a conventional multi-room air conditioner. In FIG. 10, reference numeral 1 denotes an outdoor unit of a multi-room air conditioner,
It comprises a four-way valve 3, an outdoor heat exchanger 11, and an outdoor expansion valve 12. Numeral 8 denotes an indoor unit, which comprises an indoor expansion valve 9 and an indoor heat exchanger 10, respectively.
The pipes are connected in parallel by a gas pipe 7. Reference numeral 4 denotes discharge pressure detecting means provided on the high pressure side of the compressor 2;
Is an outdoor electric expansion valve controller for controlling the outdoor expansion valve 12.
【0004】以上のように構成された多室型空気調和機
について、以下その動作について説明する。The operation of the multi-room air conditioner configured as described above will be described below.
【0005】まず、冷房運転について説明する。この場
合の冷媒の流れは実線矢印で表し、各室内側膨脹弁は各
室内負荷に応じた開度となっている。[0005] First, the cooling operation will be described. In this case, the flow of the refrigerant is indicated by a solid line arrow, and each indoor expansion valve has an opening corresponding to each indoor load.
【0006】圧縮機2より吐出された冷媒は、四方弁3
を介して室外側熱交換器11に流入し、室外側熱交換器
11で凝縮液化された冷媒は、室外側膨脹弁12を通っ
て液管6に導かれる。そして室内側膨脹弁9で減圧さ
れ、各室内側熱交換器10に流入し、それぞれ蒸発気化
したあと、ガス管7を通り、四方弁3を介し、圧縮機2
に戻り、冷房運転を行う。The refrigerant discharged from the compressor 2 is supplied to the four-way valve 3
The refrigerant which flows into the outdoor heat exchanger 11 through the, and is condensed and liquefied in the outdoor heat exchanger 11 is guided to the liquid pipe 6 through the outdoor expansion valve 12. Then, the pressure is reduced by the indoor expansion valve 9, flows into each indoor heat exchanger 10, evaporates and then passes through the gas pipe 7, through the four-way valve 3, and through the compressor 2.
And perform the cooling operation.
【0007】また、室外側膨脹弁12の制御について説
明する。室外側膨脹弁コントローラー5は、吐出圧力セ
ンサー4により検知された吐出圧力を入力し、吐出圧力
目標値との演算により室外側膨脹弁12の弁開度を決定
し、室外側膨脹弁を制御している。Next, control of the outdoor expansion valve 12 will be described. The outdoor expansion valve controller 5 inputs the discharge pressure detected by the discharge pressure sensor 4, determines the opening degree of the outdoor expansion valve 12 by calculating the discharge pressure target value, and controls the outdoor expansion valve. ing.
【0008】例えば、室外気温の上昇などにより室外側
の負荷が大きくなった場合には、吐出圧力が目標値以上
に上昇するため室外側膨脹弁12の開度を開く。逆に室
外気温の低下などにより室外側の負荷が小さくなった場
合には、吐出圧力が目標値以下に低下するため室外側膨
脹弁12の開度を絞る。For example, when the load on the outdoor side increases due to an increase in the outdoor air temperature or the like, the opening degree of the outdoor expansion valve 12 is increased because the discharge pressure increases to a target value or more. Conversely, when the load on the outdoor side is reduced due to a decrease in the outdoor temperature, the opening degree of the outdoor expansion valve 12 is reduced because the discharge pressure decreases to a target value or less.
【0009】[0009]
【発明が解決しようとする課題】しかしながら上記従来
の構成では、熱交換器内の液冷媒量の変化により凝縮能
力を制御するため能力可変幅が少なく、また、低外機温
での冷房運転においては、凝縮能力が過大となり吐出圧
力が異常低下し、圧縮比が過小となるために圧縮機の給
油不良を引き起こす等の圧縮機信頼製の確保が充分でな
いという問題点があった。However, in the above-mentioned conventional configuration, the capacity variable width is small because the condensing capacity is controlled by changing the liquid refrigerant amount in the heat exchanger, and the cooling operation at a low outside unit temperature is required. However, there has been a problem that the compressor is not sufficiently reliable because the condensing capacity is excessive, the discharge pressure is abnormally reduced, and the compression ratio is excessively low.
【0010】本発明は上記課題を解決するもので、吐出
圧力が急激に低下した場合などの、圧力変動に対して応
答が良く安定な冷凍サイクルを形成し、圧縮機の信頼性
を常に確保すると共に、安価な仕様で広範囲な負荷に対
応する冷房運転を実現することのできる空気調和機を提
供することを目的とするものである。[0010] The present invention solves the above-mentioned problems, and forms a stable refrigeration cycle with good response to pressure fluctuations such as when the discharge pressure drops sharply, and always ensures the reliability of the compressor. It is another object of the present invention to provide an air conditioner that can realize a cooling operation corresponding to a wide range of loads with inexpensive specifications.
【0011】また、圧縮比が過小となった場合、適正な
圧縮比を応答良く確保し、圧縮機の給油不良を未然に防
止することで、より高い信頼性を確保することを目的と
するものである。Another object of the present invention is to secure an appropriate compression ratio with good response when the compression ratio becomes excessively small and to prevent poor oiling of the compressor beforehand, thereby ensuring higher reliability. It is.
【0012】さらに、圧縮比が過度的に変化した場合、
封止弁の誤動作を防止し、常に効率の良い安定な冷凍サ
イクルを形成することを目的とするものである。Further, when the compression ratio changes excessively,
It is an object of the present invention to prevent a malfunction of a sealing valve and always form an efficient and stable refrigeration cycle.
【0013】[0013]
【課題を解決するための手段】本発明の空気調和機にお
いては、圧縮機と複数の室外側熱交換器の間における前
記複数の室外側熱交換器の分岐点と前記室外側熱交換器
の間に封止弁を備え、圧縮機の吐出側の圧力を検知する
吐出圧力検知手段と、前記吐出圧力検知手段の検知値を
入力として前記封止弁の開閉を制御する封止弁制御手段
とを備えたものである。In the air conditioner according to the present invention, a branch point of the plurality of outdoor heat exchangers between the compressor and the plurality of outdoor heat exchangers and a branch point of the outdoor heat exchanger are provided. A sealing valve between the compressor, a discharge pressure detecting means for detecting the pressure on the discharge side of the compressor, a sealing valve control means for controlling the opening and closing of the sealing valve with a detection value of the discharge pressure detecting means as an input It is provided with.
【0014】この発明によれば、圧力変動に対して応答
が良く安定な冷凍サイクルを形成し、圧縮機の信頼性を
常に確保すると共に、安価な仕様で広範囲な負荷に対応
する冷房運転を実現することのできる空気調和機が得ら
れる。According to the present invention, a stable refrigeration cycle with good response to pressure fluctuations is formed, the reliability of the compressor is always ensured, and the cooling operation corresponding to a wide range of loads with low-cost specifications is realized. An air conditioner that can be operated is obtained.
【0015】また、圧縮機の吸入側の圧力を検知する吸
入圧力検知手段と、前記吸入圧力検知手段の検知値を入
力として、前記封止弁の開閉を制御する封止弁制御手段
とを備えたものである。Further, there are provided suction pressure detecting means for detecting the pressure on the suction side of the compressor, and sealing valve control means for controlling the opening and closing of the sealing valve by using a detection value of the suction pressure detecting means as an input. It is a thing.
【0016】この発明によれば、適正な圧縮比を応答良
く確保し、圧縮機の給油不良を未然に防止することで、
より高い信頼性を確保できる空気調和機が得られる。According to the present invention, an appropriate compression ratio is ensured with good response, and poor refueling of the compressor is prevented beforehand.
An air conditioner that can ensure higher reliability can be obtained.
【0017】さらに、圧縮機の吸入側の圧力を検知する
吸入圧力検知手段と、室内機の負荷を検知する室内負荷
検知手段と、室外機の負荷を検知する室外負荷検知手段
と、前記吸入圧力検知手段の検知値と前記室内負荷検知
手段の検知値と前記室外負荷検知手段の検知値とを入力
として前記封止弁の開閉を制御する封止弁制御手段とを
備えたものである。Further, suction pressure detecting means for detecting the pressure on the suction side of the compressor, indoor load detecting means for detecting the load on the indoor unit, outdoor load detecting means for detecting the load on the outdoor unit, and the suction pressure A sealing valve control unit that controls opening and closing of the sealing valve by inputting a detection value of a detection unit, a detection value of the indoor load detection unit, and a detection value of the outdoor load detection unit.
【0018】この発明によれば、過度的な圧縮比の低下
に対する封止弁の誤動作を防止し、常に効率の良い安定
な冷凍サイクルを形成することができる空気調和機が得
られる。According to the present invention, it is possible to obtain an air conditioner capable of preventing a malfunction of the sealing valve due to an excessive decrease in the compression ratio and always forming an efficient and stable refrigeration cycle.
【0019】[0019]
【発明の実施の形態】本発明の請求項1に記載の発明
は、圧縮機、複数の室外側熱交換器、室外側膨脹弁、前
記圧縮機と前記室外側熱交換器の間における前記複数の
室外側熱交換器の分岐点と前記室外側熱交換器の間に封
止弁を有する室外機で、前記圧縮機の吐出側の圧力を検
知する吐出圧力検知手段と、前記吐出圧力検知手段の検
知値を入力として前記封止弁の開閉を制御する封止弁制
御手段とを備えた空気調和機であり、前記圧縮機の吐出
側の圧力を検知することにより必要な凝縮能力を把握す
ることができ、圧力変動に対し前記封止弁を開閉するこ
とにより、応答が良く安定な冷凍サイクルを形成し圧縮
機の信頼性を常に確保すると共に、広範囲な負荷に対応
する冷房運転を実現するという作用を有する。DETAILED DESCRIPTION OF THE INVENTION The invention as set forth in claim 1 of the present invention comprises a compressor, a plurality of outdoor heat exchangers, an outdoor expansion valve, and the plurality of outdoor heat exchangers between the compressor and the outdoor heat exchanger. An outdoor unit having a sealing valve between a branch point of the outdoor heat exchanger and the outdoor heat exchanger, a discharge pressure detecting means for detecting a pressure on a discharge side of the compressor, and the discharge pressure detecting means And a sealing valve control means for controlling the opening and closing of the sealing valve by using the detected value as an input, and grasping the necessary condensation capacity by detecting the pressure on the discharge side of the compressor. By opening and closing the sealing valve against pressure fluctuations, a stable refrigeration cycle with good response is formed, the reliability of the compressor is always ensured, and the cooling operation corresponding to a wide range of loads is realized. It has the action of:
【0020】請求項2に記載の発明は、請求項1に記載
の発明に加えて圧縮機の吸入側の圧力を検知する吸入圧
力検知手段と、吐出圧力検知手段の検知値と前記吸入圧
力検知手段の検知値を入力として、前記封止弁の開閉を
制御する封止弁制御手段とを備えたものであり、圧縮機
の吐出側の圧力と吸入側の圧力を検知することにより、
適正な圧縮比を応答良く確保し、圧縮機の給油不良を未
然に防止することで、より高い信頼性を確保できるとい
う作用を有する。According to a second aspect of the present invention, in addition to the first aspect, a suction pressure detecting means for detecting a pressure on the suction side of the compressor, a detection value of the discharge pressure detecting means, and the suction pressure detection With the detection value of the means as input, it is provided with sealing valve control means for controlling the opening and closing of the sealing valve, by detecting the pressure on the discharge side and the pressure on the suction side of the compressor,
By ensuring an appropriate compression ratio with good response and preventing defective oiling of the compressor beforehand, it has the effect of ensuring higher reliability.
【0021】請求項3に記載の発明は、請求項1に記載
の発明に加えて、圧縮機の吸入側の圧力を検知する吸入
圧力検知手段と、室内機の負荷を検知する室内負荷検知
手段と、室外機の負荷を検知する室外負荷検知手段と、
吐出圧力検知手段の検知値と前記吸入圧力検知手段の検
知値と前記室内負荷検知手段の検知値と前記室外負荷検
知手段の検知値とを入力として、前記封止弁の開閉を制
御する封止弁制御手段とを備えたものであり、過度的な
圧縮比の低下に対する封止弁の誤動作を防止し、常に効
率の良い安定な冷凍サイクルを形成することができると
いう作用を有する。According to a third aspect of the present invention, in addition to the first aspect, a suction pressure detecting means for detecting a pressure on a suction side of the compressor and an indoor load detecting means for detecting a load of the indoor unit. And an outdoor load detecting means for detecting a load on the outdoor unit,
Sealing for controlling the opening and closing of the sealing valve by inputting a detection value of a discharge pressure detection unit, a detection value of the suction pressure detection unit, a detection value of the indoor load detection unit, and a detection value of the outdoor load detection unit. Valve control means for preventing malfunction of the sealing valve due to an excessive decrease in compression ratio, and has an effect that an efficient and stable refrigeration cycle can always be formed.
【0022】[0022]
【実施例】以下、本発明の実施例について、図1から図
9を用いて説明する。尚、従来例と同一構成については
同一符号を付してその詳細な説明を省略する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. The same components as those of the conventional example are denoted by the same reference numerals, and detailed description thereof will be omitted.
【0023】(実施例1)図1は冷凍サイクル図を示し
ている。図1において、4は圧縮機2の吐出圧力を検知
する吐出圧力検知手段、13は第1の室外側熱交換器、
14は第1の室外側熱交換器13に並列に設けられた第
2の室外側熱交換器、15は第1の室外側熱交換器13
の四方弁3側に直列に設けられた封止弁、18は封止弁
制御手段で、吐出圧力検知手段4の出力に応じて封止弁
15の開閉を制御する。吐出圧力検知手段4は圧力セン
サーが好ましく、封止弁15は、冷媒の流入を封止する
作用を行うもので、好ましくは電磁弁または可逆弁によ
り構成される。(Embodiment 1) FIG. 1 shows a refrigeration cycle diagram. In FIG. 1, reference numeral 4 denotes a discharge pressure detecting means for detecting a discharge pressure of the compressor 2, 13 denotes a first outdoor heat exchanger,
14 is a second outdoor heat exchanger provided in parallel with the first outdoor heat exchanger 13, and 15 is the first outdoor heat exchanger 13
A sealing valve 18 provided in series on the side of the four-way valve 3 is a sealing valve control means for controlling the opening and closing of the sealing valve 15 according to the output of the discharge pressure detecting means 4. The discharge pressure detecting means 4 is preferably a pressure sensor, and the sealing valve 15 has a function of sealing the flow of the refrigerant, and is preferably constituted by an electromagnetic valve or a reversible valve.
【0024】以上のように構成された空気調和機につい
て、その動作を説明する。まず、冷房運転について説明
する。この場合の冷媒の流れは実線矢印で表し、各室内
側膨脹弁9は各室内負荷に応じた開度となっている。The operation of the air conditioner configured as described above will be described. First, the cooling operation will be described. The flow of the refrigerant in this case is indicated by a solid line arrow, and each indoor expansion valve 9 has an opening corresponding to each indoor load.
【0025】圧縮機2より吐出された冷媒は、四方弁3
を介し第1の室外側熱交換器13と第2の室外側熱交換
器14に分割されて流入し、凝縮液化された冷媒は室外
側膨脹弁12入口で合流し室外側膨脹弁12を介して液
管11へ導かれる。そして室内側膨脹弁9で減圧され、
各室内側熱交換器10に流入し、それぞれ蒸発気化した
後、ガス管を7を通り、四方弁3を介し圧縮機2に戻り
冷房運転を行う。The refrigerant discharged from the compressor 2 is supplied to the four-way valve 3
The refrigerant is divided into the first outdoor heat exchanger 13 and the second outdoor heat exchanger 14 and flows therethrough, and the condensed and liquefied refrigerant joins at the entrance of the outdoor expansion valve 12 and passes through the outdoor expansion valve 12. To the liquid pipe 11. Then, the pressure is reduced by the indoor expansion valve 9,
After flowing into each indoor side heat exchanger 10 and evaporating and evaporating respectively, it returns to the compressor 2 through the gas pipe 7 via the four-way valve 3 to perform the cooling operation.
【0026】図2は、封止弁15の制御ブロック図、図
3は封止弁15の制御フローチャートである。FIG. 2 is a control block diagram of the sealing valve 15, and FIG.
【0027】次に、冷房運転時の封止弁15の制御につ
いて図3を用いて説明する。まず、冷房もしくは暖房の
運転が選択され(ステップ1)、冷房運転時は吐出圧力
検知手段4により検知された吐出圧力(ステップ2)
が、例えば条件1の様にあらかじめ決定しておいた制御
条件と比較され(ステップ3)、封止弁15の開閉が決
定されて制御される(ステップ4)。Next, control of the sealing valve 15 during the cooling operation will be described with reference to FIG. First, the cooling or heating operation is selected (step 1). During the cooling operation, the discharge pressure detected by the discharge pressure detecting means 4 (step 2).
Is compared with a previously determined control condition such as condition 1 (step 3), and the opening and closing of the sealing valve 15 is determined and controlled (step 4).
【0028】(条件1)吐出圧力<0.98MPaなら
ば閉操作 例えば、外気温の低い冷房運転や室内機運転台数の少な
い冷房負荷の過小な場合には、凝縮能力が過大となるた
めに吐出圧力が、例えば0.75MPaのように異常低
下する。このような場合には封止弁15が閉じられ、第
1の室外側熱交換器13への冷媒流入が阻止され凝縮能
力を瞬時に減少させることができ、吐出圧力が応答良く
上昇する。すなわち、例えば第1、第2の室外側熱交換
器13、14の能力が等しく、室外側膨脹弁12で50
%から100%の凝縮能力制御が可能である場合、封止
弁15を閉じることにより凝縮能力の制御範囲は25%
から100%の範囲で可能となり、負荷の大小に関わら
ず圧力状態を常に安定に保つことができ、常に圧縮機2
の信頼性を確保することができる。(Condition 1) Close operation if discharge pressure is <0.98 MPa. For example, in the case of a cooling operation in which the outside air temperature is low or a cooling load in which the number of indoor units operated is small, the condensing capacity becomes excessive, so that the discharging operation is performed. The pressure drops abnormally, for example, to 0.75 MPa. In such a case, the sealing valve 15 is closed, the refrigerant is prevented from flowing into the first outdoor heat exchanger 13, the condensation capacity can be instantaneously reduced, and the discharge pressure rises responsively. That is, for example, the first and second outdoor heat exchangers 13 and 14 have the same capacity, and the outdoor expansion valve 12
When the control of the condensing capacity from 100% to 100% is possible, the control range of the condensing capacity is 25% by closing the sealing valve 15.
From 100% to 100%, and the pressure state can always be kept stable regardless of the magnitude of the load.
Reliability can be ensured.
【0029】(実施例2)図4は冷凍サイクル図を示
し、実施例1と同一構成については同一符号を付してそ
の詳細な説明を省略する。21は封止弁制御手段、20
は圧縮機2の吸入圧力を検知する吸入圧力検知手段であ
り、吸入圧力検知手段20は圧力センサーが好ましい。(Embodiment 2) FIG. 4 shows a refrigeration cycle diagram, and the same components as those in Embodiment 1 are denoted by the same reference numerals and detailed description thereof will be omitted. 21 is a sealing valve control means, 20
Is a suction pressure detecting means for detecting the suction pressure of the compressor 2, and the suction pressure detecting means 20 is preferably a pressure sensor.
【0030】以上のように構成された空気調和機につい
て、その動作は実施例1と同じであるため、ここでは省
略し制御についてのみ説明する。The operation of the air conditioner configured as described above is the same as that of the first embodiment, and therefore the description is omitted here and only the control will be described.
【0031】図5は封止弁15の制御ブロック図、図6
は封止弁15の制御フローチャートである。FIG. 5 is a control block diagram of the sealing valve 15, and FIG.
Is a control flowchart of the sealing valve 15.
【0032】次に冷房運転時の封止弁15の制御ついて
図6を用いて説明する。まず、冷房もしくは暖房の運転
が選択され(ステップ11)、冷房運転時は吐出圧力検
知手段4により検知された吐出圧力と吸入圧力検知手段
20により検知された吸入圧力(ステップ12)とから
圧縮比が算出され(ステップ13)、その圧縮比が例え
ば条件2の様にあらかじめ決定しておいた制御条件と比
較され(ステップ14)、封止弁15の開閉が決定され
て制御される(ステップ15)。Next, control of the sealing valve 15 during the cooling operation will be described with reference to FIG. First, a cooling or heating operation is selected (step 11). During the cooling operation, the compression ratio is determined from the discharge pressure detected by the discharge pressure detecting means 4 and the suction pressure detected by the suction pressure detecting means 20 (step 12). Is calculated (step 13), and the compression ratio is compared with a predetermined control condition such as condition 2 (step 14), and the opening and closing of the sealing valve 15 is determined and controlled (step 15). ).
【0033】(条件2)圧縮比<3.0ならば閉操作 例えば、外気温の低い冷房運転や室内機運転台数の少な
い冷房負荷の過小な場合には、凝縮能力が過大となるた
め圧縮比が、たとえば、2.0のように異常低下する。
このような場合には封止弁15が閉じられ、第1の室外
側熱交換器13への冷媒流入が阻止され凝縮能力を瞬時
に減少させることができ、圧縮比が応答良く上昇する。(Condition 2) Close operation if the compression ratio is less than 3.0 For example, in the case of a cooling operation in which the outside air temperature is low or a cooling load in which the number of indoor units is small, the condensing capacity becomes excessive, so that the compression ratio Is abnormally reduced, for example, to 2.0.
In such a case, the sealing valve 15 is closed, the refrigerant is prevented from flowing into the first outdoor heat exchanger 13, the condensing capacity can be instantaneously reduced, and the compression ratio increases responsively.
【0034】すなわち、圧縮比を常時監視しているた
め、異常な圧縮比の低下を未然に防止し、より高い圧縮
機2の信頼性を常に確保でき、安定な冷凍サイクルを実
現することができる。That is, since the compression ratio is constantly monitored, an abnormal decrease in the compression ratio can be prevented from occurring, the higher reliability of the compressor 2 can be always secured, and a stable refrigeration cycle can be realized. .
【0035】なお、吐出圧力と吸入圧力の圧力差を用い
ても同様に実施可能である。 (実施例3)図7は冷凍サイクルを示し、実施例1と同
一構成については同一符号を付してその詳細な説明を省
略する。23は室内負荷検知手段、24は室外負荷検知
手段、25は封止弁制御手段であり、室内負荷検知手段
23はサーミスタや多室形空気調和機においては室内機
運転容量を用いることもできる。また、室外負荷検知手
段24はサーミスタが好ましい。It should be noted that the present invention can be similarly implemented by using a pressure difference between the discharge pressure and the suction pressure. (Embodiment 3) FIG. 7 shows a refrigeration cycle, and the same components as those in Embodiment 1 are denoted by the same reference numerals and detailed description thereof will be omitted. 23 is an indoor load detecting means, 24 is an outdoor load detecting means, 25 is a sealing valve control means, and the indoor load detecting means 23 can use the indoor unit operating capacity in a thermistor or a multi-room air conditioner. The outdoor load detecting means 24 is preferably a thermistor.
【0036】以上のように構成された空気調和機につい
て、その動作は実施例1と同じであるため、ここでは省
略し制御についてのみ説明する。The operation of the air conditioner configured as described above is the same as that of the first embodiment, and therefore the description is omitted here and only the control will be described.
【0037】図8は、封止弁15の制御ブロック図、図
9は封止弁15の制御フローチャートである。次に冷房
運転時の封止弁15の制御について図9を用いて説明す
る。まず、冷房もしくは暖房の運転が選択され(ステッ
プ21)、冷房運転時は一方では吐出圧力検知手段4に
より検知された吐出圧力と吸入圧力検知手段20により
検知された吸入圧力(ステップ22)とから圧縮比が算
出され(ステップ23)、もう一方では室内負荷検知手
段23により室内負荷が検知され、室外負荷検知手段2
4により室外負荷が検知される(ステップ24)。次に
圧縮比、室内負荷、室外負荷が、例えば条件3の様にあ
らかじめ決定しておいた制御条件と比較され(ステップ
25)、封止弁15の開閉が決定されて制御される。
(ステップ26) (条件3)圧縮比<3.0かつ室内負荷<20℃かつ室
外負荷<20℃ならば閉操作 例えば、圧縮機2の起動時や室内負荷の急激な変動があ
った場合には、圧縮機2の圧縮比が一時的に低下するこ
とがあるが、このような場合にも外気温度、室内温度、
室内機運転容量を常時監視することで、過度的な圧縮比
の低下で封止弁が閉操作となり吐出圧力が異常上昇する
といった誤操作を未然に防止することができる。FIG. 8 is a control block diagram of the sealing valve 15, and FIG. 9 is a control flowchart of the sealing valve 15. Next, control of the sealing valve 15 during the cooling operation will be described with reference to FIG. First, the cooling or heating operation is selected (step 21). During the cooling operation, on the one hand, the discharge pressure detected by the discharge pressure detecting means 4 and the suction pressure detected by the suction pressure detecting means 20 (step 22) are used. The compression ratio is calculated (step 23). On the other hand, the indoor load is detected by the indoor load detecting means 23, and the outdoor load detecting means 2 is detected.
4 detects an outdoor load (step 24). Next, the compression ratio, the indoor load, and the outdoor load are compared with control conditions determined in advance, for example, as condition 3 (step 25), and the opening and closing of the sealing valve 15 are determined and controlled.
(Step 26) (Condition 3) Closing operation if the compression ratio is <3.0, the indoor load is less than 20 ° C., and the outdoor load is less than 20 ° C. For example, when the compressor 2 is started or when there is a sudden change in the indoor load. May temporarily reduce the compression ratio of the compressor 2, but in such a case, the outside air temperature, the indoor temperature,
By constantly monitoring the operating capacity of the indoor unit, it is possible to prevent an erroneous operation in which the sealing valve closes due to an excessive decrease in the compression ratio and the discharge pressure rises abnormally.
【0038】すなわち、封止弁15の必要性をより確実
に認識することができ、常に安定な冷凍サイクルを実現
するとともに、圧縮機2の信頼性を確保できることがで
きる。That is, the necessity of the sealing valve 15 can be more reliably recognized, and a stable refrigeration cycle can always be realized, and the reliability of the compressor 2 can be ensured.
【0039】なお、本実施例においては、室外側熱交換
器が2つ、室外側膨脹弁が1つの場合について説明した
が、それぞれ2つ以上ある場合についても封止弁を必要
個数用いて制御させることで、同様に実施可能である。In this embodiment, the case where the number of outdoor heat exchangers is two and the number of outdoor expansion valves is one has been described. By doing so, it can be implemented similarly.
【0040】[0040]
【発明の効果】以上のように本発明によれば、圧縮機と
複数の室外側熱交換器の間における前記複数の室外側熱
交換器の分岐点と前記室外側熱交換器の間に封止弁を備
え、前記圧縮機の吐出側の圧力を検知する吐出圧力検知
手段と、前記吐出圧力検知手段の検知値を入力として、
前記封止弁の開閉を制御する封止弁制御手段とを備えた
ものである。As described above, according to the present invention, a seal is provided between a branch point of the plurality of outdoor heat exchangers between the compressor and the plurality of outdoor heat exchangers and the outdoor heat exchanger. With a stop valve, discharge pressure detection means for detecting the pressure on the discharge side of the compressor, and a detection value of the discharge pressure detection means as an input,
Sealing valve control means for controlling the opening and closing of the sealing valve.
【0041】そのため、外気温の低い冷房運転や室内機
運転台数の少ない冷房負荷の過小な場合にも、吐出圧力
が常時監視されているため、吐出圧力がたとえば0.7
5MPaのように異常低下しても封止弁が閉じられ、片
側の室外側熱交換器への冷媒流入が阻止されて凝縮脳力
を瞬時に減少させることができ、吐出圧力が応答良く上
昇する。Therefore, even in the case of a cooling operation in which the outside air temperature is low or the number of indoor units operating is small and the cooling load is too small, the discharge pressure is constantly monitored.
Even if the pressure drops abnormally as in 5 MPa, the sealing valve is closed, the refrigerant is prevented from flowing into one of the outdoor heat exchangers, and the condensing cerebral power can be instantaneously reduced, and the discharge pressure rises responsively. .
【0042】すなわち、常に圧縮機の信頼性を確保し、
応答良く安定な冷凍サイクルを形成すると共に広範囲の
負荷に対応した冷房運転を実現することができるという
有利な効果が得られる。That is, always ensure the reliability of the compressor,
An advantageous effect is obtained in that a stable refrigeration cycle with good response can be formed and cooling operation corresponding to a wide range of loads can be realized.
【0043】また、圧縮機と複数の室外側熱交換器の間
における前記複数の室外側熱交換器の分岐点と前記室外
側熱交換器の間に封止弁を備え、前記圧縮機の吐出側の
圧力を検知する吐出圧力検知手段と、前記圧縮機の吸入
側の圧力を検知する吸入圧力検知手段と、前記吐出圧力
検知手段の検知値と前記吸入圧力検知手段の検知値を入
力として前記封止弁の開閉を制御する封止弁制御手段と
を備えたものである。Further, a sealing valve is provided between a branch point of the plurality of outdoor heat exchangers between the compressor and the plurality of outdoor heat exchangers and the outdoor heat exchanger, and a discharge valve of the compressor is provided. Pressure detection means for detecting pressure on the suction side, suction pressure detection means for detecting pressure on the suction side of the compressor, and a detection value of the discharge pressure detection means and a detection value of the suction pressure detection means as inputs. Sealing valve control means for controlling the opening and closing of the sealing valve.
【0044】そのため、外気温の低い冷房運転や室内機
運転台数の少ない冷房負荷の過小な場合にも、圧縮機が
常時監視されているため、圧縮比がたとえば2.0のよ
うに異常低下することを封止弁が閉じることにより未然
に防止し、常に圧縮機の信頼性を確保し、安定な冷凍サ
イクルを実現することができるという有利な効果が得ら
れる。Therefore, even in the case of a cooling operation in which the outside air temperature is low or the number of indoor units in operation is small and the cooling load is too small, since the compressor is constantly monitored, the compression ratio is abnormally lowered to, for example, 2.0. This is prevented beforehand by closing the sealing valve, and the advantageous effects of always ensuring the reliability of the compressor and realizing a stable refrigeration cycle can be obtained.
【0045】また、圧縮機と複数の室外側熱交換器の間
における前記複数の室外側熱交換器の分岐点と前記室外
側熱交換器の間に封止弁を備え、前記圧縮機の吐出側の
圧力を検知する吐出圧力検知手段と、前記圧縮機の吸入
側の圧力を検知する吸入圧力検知手段と、室内機の負荷
を検知する室内負荷検知手段と、室外機の負荷を検知す
る室外負荷検知手段と、前記吐出圧力検知手段の検知値
と前記吸入圧力検知手段の検知値と前記室内負荷検知手
段の検知値と前記室外負荷検知手段の検知値とを入力と
して前記封止弁の開閉を制御する封止弁制御手段とを備
えたものである。A sealing valve is provided between a branch point of the plurality of outdoor heat exchangers between the compressor and the plurality of outdoor heat exchangers and the outdoor heat exchanger, and a discharge valve of the compressor is provided. Pressure detecting means for detecting the pressure on the suction side, suction pressure detecting means for detecting the pressure on the suction side of the compressor, indoor load detecting means for detecting the load on the indoor unit, and outdoor detecting the load on the outdoor unit Opening and closing the sealing valve by inputting a load detection unit, a detection value of the discharge pressure detection unit, a detection value of the suction pressure detection unit, a detection value of the indoor load detection unit, and a detection value of the outdoor load detection unit. And sealing valve control means for controlling the pressure.
【0046】そのため、圧縮機の起動時や室内負荷の急
激な変動により圧縮比が一時的に低下するような場合に
は、外機温度、室内温度、室内機運転容量が常時監視さ
れているため、過度的な圧縮比の低下で封止弁が閉操作
となり吐出圧力が異常上昇するといった誤操作を未然に
防止することができる。Therefore, when the compressor is started or when the compression ratio temporarily drops due to a sudden change in the indoor load, the external unit temperature, the indoor temperature, and the indoor unit operating capacity are constantly monitored. In addition, it is possible to prevent an erroneous operation in which the sealing valve is closed due to an excessive decrease in the compression ratio and the discharge pressure is abnormally increased.
【0047】すなわち、封止弁の必要性をより確実に認
識することができ、常に安定な冷凍サイクルを実現する
とともに、より高い圧縮機の信頼性を確保できるという
有利な効果が得られる。That is, it is possible to more reliably recognize the necessity of the sealing valve, and it is possible to obtain an advantageous effect that a stable refrigeration cycle is always realized and a higher reliability of the compressor can be secured.
【図1】本発明の実施例1による空気調和機を示す冷凍
サイクル図FIG. 1 is a refrigeration cycle diagram showing an air conditioner according to Embodiment 1 of the present invention.
【図2】同実施例による空気調和機を示す封止弁の制御
ブロック図FIG. 2 is a control block diagram of a sealing valve showing the air conditioner according to the embodiment.
【図3】同実施例による空気調和機を示す封止弁の制御
フローチャートFIG. 3 is a control flowchart of a sealing valve showing the air conditioner according to the embodiment.
【図4】本発明の実施例2による空気調和機を示す冷凍
サイクル図FIG. 4 is a refrigeration cycle diagram showing an air conditioner according to Embodiment 2 of the present invention.
【図5】同実施例による空気調和機を示す封止弁の制御
ブロック図FIG. 5 is a control block diagram of a sealing valve showing the air conditioner according to the embodiment.
【図6】同実施例による空気調和機を示す封止弁の制御
フローチャートFIG. 6 is a control flowchart of a sealing valve showing the air conditioner according to the embodiment.
【図7】本発明の実施例3による空気調和機を示す冷凍
サイクル図FIG. 7 is a refrigeration cycle diagram showing an air conditioner according to Embodiment 3 of the present invention.
【図8】同実施例による空気調和機を示す封止弁の制御
ブロック図FIG. 8 is a control block diagram of a sealing valve showing the air conditioner according to the embodiment.
【図9】同実施例による空気調和機を示す封止弁の制御
フローチャートFIG. 9 is a control flowchart of a sealing valve showing the air conditioner according to the embodiment.
【図10】従来の空気調和機を示す冷凍サイクル図FIG. 10 is a refrigeration cycle diagram showing a conventional air conditioner.
2 圧縮機 3 四方弁 4 吐出圧力検知手段 12 室外側膨脹弁 13,14 室外側熱交換器 15 封止弁 18,21,25 封止弁制御手段 19,22,26 室外機 20 吸入圧力検知手段 23 室内負荷検知手段 24 室外負荷検知手段 2 Compressor 3 Four-way valve 4 Discharge pressure detection means 12 Outdoor expansion valve 13, 14 Outdoor heat exchanger 15 Sealing valve 18, 21, 25 Sealing valve control means 19, 22, 26 Outdoor unit 20 Suction pressure detecting means 23 Indoor load detecting means 24 Outdoor load detecting means
───────────────────────────────────────────────────── フロントページの続き (72)発明者 林 淳二 大阪府東大阪市高井田本通4丁目2番5号 松下冷機株式会社内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junji Hayashi 4-5-2-5 Takaidahondori, Higashiosaka-shi, Osaka Matsushita Refrigeration Co., Ltd.
Claims (3)
膨脹弁、前記圧縮機と前記複数の室外側熱交換器の間に
おける前記複数の室外側熱交換器の分岐点と前記室外側
熱交換器の間に備えた封止弁を有する室外機と、前記圧
縮機の吐出側の圧力を検知する吐出圧力検知手段と、前
記吐出圧力検知手段の検知値を入力として前記封止弁の
開閉を制御する封止弁制御手段とを備えた空気調和機。1. A compressor, a plurality of outdoor heat exchangers, an outdoor expansion valve, a branch point of the plurality of outdoor heat exchangers between the compressor and the plurality of outdoor heat exchangers, and the chamber. An outdoor unit having a sealing valve provided between outer heat exchangers, a discharge pressure detecting means for detecting a pressure on a discharge side of the compressor, and the sealing valve having a detection value of the discharge pressure detecting means as an input. An air conditioner comprising: a sealing valve control unit that controls opening and closing of the air conditioner.
力検知手段と、吐出圧力検知手段の検知値と前記吸入圧
力検知手段の検知値を入力として、前記封止弁の開閉を
制御する封止弁制御手段とを備えた請求項1記載の空気
調和機。2. An opening / closing of the sealing valve is controlled by inputting a detection value of a suction pressure detecting means for detecting a pressure on a suction side of a compressor, a detection value of a discharge pressure detecting means, and a detection value of the suction pressure detecting means. The air conditioner according to claim 1, further comprising a sealing valve control unit.
力検知手段と、室内機の負荷を検知する室内負荷検知手
段と、室外機の負荷を検知する室外負荷検知手段と、吐
出圧力検知手段の検知値と前記吸入圧力検知手段の検知
値と前記室内負荷検知手段の検知値と前記室外負荷検知
手段の検知値とを入力として前記封止弁の開閉を制御す
る封止弁制御手段とを備えた請求項1記載の空気調和
機。3. A suction pressure detecting means for detecting a pressure on a suction side of a compressor, an indoor load detecting means for detecting a load on an indoor unit, an outdoor load detecting means for detecting a load on an outdoor unit, and a discharge pressure detecting. Sealing valve control means for controlling the opening and closing of the sealing valve by inputting the detected value of the means, the detected value of the suction pressure detecting means, the detected value of the indoor load detecting means, and the detected value of the outdoor load detecting means; The air conditioner according to claim 1, further comprising:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8198729A JPH1047797A (en) | 1996-07-29 | 1996-07-29 | Air conditioner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8198729A JPH1047797A (en) | 1996-07-29 | 1996-07-29 | Air conditioner |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH1047797A true JPH1047797A (en) | 1998-02-20 |
Family
ID=16396023
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8198729A Pending JPH1047797A (en) | 1996-07-29 | 1996-07-29 | Air conditioner |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH1047797A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111595000A (en) * | 2020-05-18 | 2020-08-28 | 广东美的暖通设备有限公司 | Air conditioning system, control method and device of hydraulic module of air conditioning system and storage medium |
US11371755B2 (en) * | 2017-09-15 | 2022-06-28 | Mitsubishi Electric Corporation | Air-conditioning apparatus |
-
1996
- 1996-07-29 JP JP8198729A patent/JPH1047797A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11371755B2 (en) * | 2017-09-15 | 2022-06-28 | Mitsubishi Electric Corporation | Air-conditioning apparatus |
CN111595000A (en) * | 2020-05-18 | 2020-08-28 | 广东美的暖通设备有限公司 | Air conditioning system, control method and device of hydraulic module of air conditioning system and storage medium |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6701732B2 (en) | Air conditioner | |
KR100405986B1 (en) | Air conditioning system and method | |
KR100821728B1 (en) | Air conditioning system | |
US20030233836A1 (en) | Freezing device | |
CN111306722B (en) | Control method of enhanced vapor injection air conditioning system | |
JP2008510953A (en) | Compressor loading control | |
JPH11108485A (en) | Method for controlling air conditioner and outlet temperature of refrigerant heater | |
WO2005024313A1 (en) | Freezer device | |
US8205463B2 (en) | Air conditioner and method of controlling the same | |
JP2001263835A (en) | Air conditioning system | |
CN110671799B (en) | Air conditioning system and refrigerant flow control method | |
JPH07120091A (en) | Air conditioner | |
JPH10185342A (en) | Heat pump type air conditioner | |
JPH1047797A (en) | Air conditioner | |
JPH04222349A (en) | Operation controller for freezer | |
JP3356485B2 (en) | Multi-room air conditioner | |
JP3661014B2 (en) | Refrigeration equipment | |
JP3558788B2 (en) | Air conditioner and control method thereof | |
JP3303689B2 (en) | Binary refrigeration equipment | |
JP2006177598A (en) | Refrigerating cycle device | |
KR100857565B1 (en) | Method for controlling air conditionner | |
JPH06272971A (en) | Air conditioner | |
KR100748982B1 (en) | Air conditioner and Control method of the same | |
JP2000088363A (en) | Heat pump type air conditioner | |
JPS6332272A (en) | Refrigerator |