JP3351076B2 - Refrigeration cycle saturated steam temperature detector - Google Patents
Refrigeration cycle saturated steam temperature detectorInfo
- Publication number
- JP3351076B2 JP3351076B2 JP32913093A JP32913093A JP3351076B2 JP 3351076 B2 JP3351076 B2 JP 3351076B2 JP 32913093 A JP32913093 A JP 32913093A JP 32913093 A JP32913093 A JP 32913093A JP 3351076 B2 JP3351076 B2 JP 3351076B2
- Authority
- JP
- Japan
- Prior art keywords
- refrigerant
- temperature
- saturated steam
- steam temperature
- 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.)
- Expired - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は、冷媒として沸点が異な
る２種類以上の冷媒を所定の比率で混合した非共沸混合
冷媒を用いた冷凍サイクルの飽和蒸気温度検出装置に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a saturated vapor temperature of a refrigeration cycle using a non-azeotropic mixed refrigerant in which two or more refrigerants having different boiling points are mixed at a predetermined ratio.
【０００２】[0002]
【従来の技術】近年、地球環境保護の立場から、オゾン
層を破壊するフロンに対する規制が強化されてきてお
り、特に破壊力が大きなＣＦＣ（クロロフルオロカーボ
ン）については１９９５年末に全廃が決定しており、ま
た破壊力が比較的小さなＨＣＦＣ（ハイドロクロロフル
オロカーボン）についても１９９６年より総量規制が開
始され、将来的には全廃されることが決定している。従
って、冷媒としてフロンを用いた機器について、その代
替冷媒の開発が進められており、オゾン層を破壊しない
ＨＦＣ（ハイドロフルオロカーボン）が検討されている
が、冷凍機や空調機に用いられているＨＣＦＣの代替冷
媒として単独で用いることのできるものはＨＦＣの中に
は見あたらず、従って２種類以上のＨＦＣ系冷媒を混合
させた非共沸の混合冷媒が有望視されている。2. Description of the Related Art In recent years, from the standpoint of protecting the global environment, regulations on chlorofluorocarbons that destroy the ozone layer have been strengthened. In particular, CFC (chlorofluorocarbon), which has a large destructive power, has been completely eliminated at the end of 1995. In addition, HCFCs (hydrochlorofluorocarbons), which have relatively small destructive power, have been regulated in total amount since 1996, and it has been decided that they will be totally abolished in the future. Therefore, for devices using chlorofluorocarbon as a refrigerant, alternative refrigerants are being developed, and HFCs (hydrofluorocarbons) that do not destroy the ozone layer are being studied. However, HCFCs used in refrigerators and air conditioners are being studied. There is no HFC that can be used alone as an alternative refrigerant to HFC. Therefore, a non-azeotropic mixed refrigerant obtained by mixing two or more HFC-based refrigerants is considered promising.
【０００３】従来、ＣＦＣやＨＣＦＣ等の単一冷媒を用
いた冷凍機や空気調和機等の冷凍サイクルは、ＣＯＰ
（成績係数）を向上させ、圧縮機の信頼性を確保するた
めにスーパーヒート制御を行っており、そのために飽和
蒸気温度検出回路を設けていた。Conventionally, a refrigeration cycle such as a refrigerator or an air conditioner using a single refrigerant such as CFC or HCFC has a COP
Superheat control was performed to improve (coefficient of performance) and ensure the reliability of the compressor, and a saturation steam temperature detection circuit was provided for that purpose.
【０００４】以下、図面を参照しながら従来の飽和蒸気
温度検出回路について説明する。図５は、従来の冷凍機
や空気調和機等の冷凍サイクル図である。同図におい
て、１は圧縮機、２は凝縮器、３はステッピングモータ
を用いて弁開度をパルス制御可能とした電動膨張弁、４
は蒸発器であり、これらは順に環状に連結されている。
また、５は凝縮器２と電動膨張弁３とを結ぶ管路に一端
を接続し、他端を蒸発器４と圧縮機１とを結ぶ管路に接
続したバイパス回路であり、このバイパス回路５には補
助絞り６が設けられている。さらに、バイパス回路５及
び圧縮機１の吸入側の管路上にそれぞれ温度センサ７、
８が配設されており、この温度センサ７、８によって検
出された温度から弁開度演算回路１０にて電動膨張弁３
の弁開度を演算して弁開度信号を送出し、この弁開度信
号を受けて膨張弁駆動回路１１にて電動膨張弁３の弁開
度を制御する。Hereinafter, a conventional saturated steam temperature detecting circuit will be described with reference to the drawings. FIG. 5 is a refrigeration cycle diagram of a conventional refrigerator, an air conditioner, and the like. In the figure, 1 is a compressor, 2 is a condenser, 3 is an electric expansion valve that can control the valve opening by using a stepping motor by pulse, 4
Are evaporators, which are sequentially connected in a ring shape.
A bypass circuit 5 has one end connected to a pipe connecting the condenser 2 and the electric expansion valve 3 and the other end connected to a pipe connecting the evaporator 4 and the compressor 1. Is provided with an auxiliary aperture 6. Further, a temperature sensor 7 and a temperature sensor 7 are respectively provided on the bypass circuit 5 and the suction-side pipe of the compressor 1.
An electric expansion valve 3 is provided by a valve opening calculating circuit 10 based on the temperatures detected by the temperature sensors 7 and 8.
Is calculated and a valve opening signal is sent out. The expansion valve drive circuit 11 controls the valve opening of the electric expansion valve 3 in response to the valve opening signal.
【０００５】図６は、この冷凍サイクルをＰ−ｈ（モリ
エル）線図上にあらわしたもので、同図におけるＡ、
Ｂ、Ｃの記号のポイントは、図５のＡ、Ｂ、Ｃの位置の
冷媒の状態を示す。同図から明らかなように、ポイント
Ｃでは気液２相状態であるため、冷媒の温度はポイント
Ｂの冷媒の飽和蒸気温度ＴＳである。従って、温度セン
サ７で検出した温度ＴＳと温度センサ８で検出した温度
Ｔ２の差（Ｔ２−ＴＳ）が、圧縮機１に吸入される冷媒
のスーパーヒート量△Ｔをあらわす。FIG. 6 shows this refrigeration cycle on a Ph (Mollier) diagram.
The points of the symbols B and C indicate the state of the refrigerant at positions A, B and C in FIG. As is clear from the figure, since the gas is in a gas-liquid two-phase state at the point C, the temperature of the refrigerant is the saturated vapor temperature TS of the refrigerant at the point B. Therefore, the difference (T2−TS) between the temperature TS detected by the temperature sensor 7 and the temperature T2 detected by the temperature sensor 8 represents the superheat amount ΔT of the refrigerant drawn into the compressor 1.
【０００６】次に、この冷凍サイクルの制御を説明す
る。図７は、スーパーヒート量と電動膨張弁３の弁開度
変更量との関係を示す図であり、温度センサ７と８で検
出した温度信号ＴＳ、Ｔ２より所定周期毎に弁開度演算
回路１０で△Ｔを算出し、図７に示す関係に従って（ス
ーパーヒート量が設定値より大きい場合は弁開度を大き
くし、設定値より小さい場合は弁開度を小さくする）、
電動膨張弁３の弁開度信号を膨張弁駆動回路１１に送出
し、膨張弁駆動回路１１にて電動膨張弁３の弁開度を制
御してスーパーヒート量を設定値に保つ。Next, control of the refrigeration cycle will be described. FIG. 7 is a diagram showing the relationship between the amount of superheat and the amount of change in the valve opening of the electric expansion valve 3. The valve opening calculating circuit is provided at predetermined intervals based on the temperature signals TS and T2 detected by the temperature sensors 7 and 8. At 10, ΔT is calculated, and according to the relationship shown in FIG. 7 (when the superheat amount is larger than the set value, the valve opening is increased, and when it is smaller than the set value, the valve opening is decreased).
A valve opening signal of the electric expansion valve 3 is sent to the expansion valve driving circuit 11, and the expansion valve driving circuit 11 controls the valve opening of the electric expansion valve 3 to keep the superheat amount at a set value.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、上記従
来の冷凍サイクルの飽和蒸気温度検出回路には以下のよ
うな課題があった。However, the above-mentioned conventional saturated steam temperature detecting circuit of the refrigeration cycle has the following problems.
【０００８】図８は、冷媒として非共沸混合冷媒を用い
た場合の冷凍サイクルをＰ−ｈ（モリエル）線図上にあ
らわしたもので、同図におけるＡ、Ｂ、Ｃの記号のポイ
ントは、図５のＡ、Ｂ、Ｃの位置の冷媒の状態を示す。
ここで、ポイントＢにおけるスーパーヒート量は、ポイ
ントＢの温度とその飽和蒸気温度（ポイントＥ）との差
で求めることができる。ここで、単一冷媒の場合は図６
に示すようにポイントＣの温度は飽和蒸気温度と同じで
あるが、非共沸混合冷媒の場合は図８に示すように、２
相域での等温線は右下がりの線となっているため、ポイ
ントＣの温度は飽和蒸気温度（ポイントＥ）の温度より
も低い。従って、温度センサ８と９で検出した温度信号
ＴＳ、Ｔ２から算出した△Ｔは真のスーパーヒート量よ
りも大きな値となってしまい、この状態で設定値に保つ
制御を行うために冷媒は、実際のスーパーヒート量が設
定値よりも低い状態か若しくは湿り蒸気の状態で圧縮機
に吸入される。FIG. 8 shows a refrigeration cycle in the case of using a non-azeotropic mixed refrigerant as a refrigerant on a Ph (Mollier) diagram, in which points A, B, and C in FIG. 5 shows the state of the refrigerant at positions A, B, and C in FIG.
Here, the amount of superheat at the point B can be obtained from the difference between the temperature at the point B and its saturated steam temperature (point E). Here, in the case of a single refrigerant, FIG.
As shown in FIG. 8, the temperature at point C is the same as the saturated steam temperature, but in the case of the non-azeotropic refrigerant mixture, as shown in FIG.
Since the isotherm in the phase region is a downward-sloping line, the temperature at the point C is lower than the temperature of the saturated steam temperature (point E). Therefore, ΔT calculated from the temperature signals TS and T2 detected by the temperature sensors 8 and 9 becomes a value larger than the true superheat amount. In order to perform control for maintaining the set value in this state, the refrigerant is The actual superheat amount is sucked into the compressor in a state lower than the set value or in a state of wet steam.
【０００９】このため、液圧縮による圧縮機信頼性の低
下やＣＯＰの低下を招くおそれがあった。For this reason, there is a possibility that the reliability of the compressor and the COP may be reduced due to the liquid compression.
【００１０】本発明の冷凍サイクルの飽和蒸気温度検出
回路は上記課題に鑑み、非共沸混合冷媒を用いた冷凍サ
イクルにおいて、冷凍サイクルの構成を複雑にすること
なく圧縮機吸入冷媒の飽和蒸気温度を簡単に検出するこ
とを目的とし、これにより最適な冷凍サイクル制御の実
現を図るものである。In view of the above-mentioned problems, a circuit for detecting a saturated vapor temperature of a refrigeration cycle according to the present invention uses a non-azeotropic mixed refrigerant in a refrigeration cycle without complicating the configuration of the refrigeration cycle. Is to be easily detected, thereby realizing the optimal refrigeration cycle control.
【００１１】[0011]
【課題を解決するための手段】上記課題を解決するため
に本発明の冷凍サイクルの飽和蒸気温度検出回路は、冷
媒として沸点が異なる２種類以上の冷媒を所定の比率で
混合した非共沸混合冷媒を用い、圧縮機、凝縮器、減圧
器、蒸発器を順に配管にて環状に連結して冷媒回路を構
成し、凝縮器出口から減圧器出口に至る管路に一端を接
続し、他端を蒸発器出口から圧縮機入口に至る管路に接
続したバイパス回路を配設し、このバイパス回路に上流
側から順に補助減圧器、冷媒温度検出手段を設け、前記
冷媒温度検出手段により冷媒温度を検出し、用いた冷媒
の種類及びその組成比に応じた所定値を前記冷媒温度に
加える飽和蒸気温度補正手段を有するものである。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a circuit for detecting a saturated vapor temperature of a refrigeration cycle according to the present invention comprises a non-azeotropic mixture in which two or more refrigerants having different boiling points are mixed at a predetermined ratio. Using a refrigerant, a compressor, a condenser, a decompressor, and an evaporator are sequentially connected in a loop with a pipe to form a refrigerant circuit, and one end is connected to a conduit from the condenser outlet to the decompressor outlet, and the other end is connected. A bypass circuit connected to a pipe line from the outlet of the evaporator to the inlet of the compressor is provided, and an auxiliary pressure reducer and a refrigerant temperature detecting means are provided in this bypass circuit in order from the upstream side, and the refrigerant temperature is detected by the refrigerant temperature detecting means. The apparatus has a saturated vapor temperature correcting means for detecting and adding a predetermined value corresponding to the type of the used refrigerant and its composition ratio to the refrigerant temperature.
【００１２】また、本発明の他の冷凍サイクルの飽和蒸
気温度検出回路は、冷媒として沸点が異なる２種類以上
の冷媒を所定の比率で混合した非共沸混合冷媒を用い、
圧縮機、凝縮器、減圧器、蒸発器を順に配管にて環状に
連結して冷媒回路を構成し、前記蒸発器入口から出口に
至る管路に複数の冷媒温度検出手段を設け、前記冷媒温
度検出手段によって検出された複数の冷媒温度を用いて
前記圧縮機に吸入される冷媒の飽和蒸気温度を算出する
飽和蒸気温度算出手段を有するものである。Further, another circuit for detecting a saturated vapor temperature of a refrigeration cycle according to the present invention uses a non-azeotropic mixed refrigerant in which two or more refrigerants having different boiling points are mixed at a predetermined ratio.
A compressor, a condenser, a decompressor, and an evaporator are sequentially connected in a ring shape by a pipe to form a refrigerant circuit, and a plurality of refrigerant temperature detecting means are provided in a pipe from the inlet to the outlet of the evaporator. There is provided a saturated steam temperature calculating means for calculating a saturated steam temperature of the refrigerant drawn into the compressor using a plurality of refrigerant temperatures detected by the detecting means.
【００１３】また、本発明の他の冷凍サイクルの飽和蒸
気温度検出回路は、冷媒として沸点が異なる２種類以上
の冷媒を所定の比率で混合した非共沸混合冷媒を用い、
圧縮機、凝縮器、減圧器、蒸発器を順に配管にて環状に
連結して冷媒回路を構成し、前記蒸発器入口から出口に
至る管路に複数の冷媒温度検出手段を設け、前記冷媒温
度検出手段によって検出された複数の冷媒温度を用いて
前記圧縮機に吸入される冷媒の飽和蒸気温度を算出する
飽和蒸気温度算出手段及びこの飽和蒸気温度算出手段に
よって算出された飽和蒸気温度を補正する飽和蒸気温度
補正手段を有するものである。Further, another saturated vapor temperature detecting circuit of the refrigeration cycle of the present invention uses a non-azeotropic mixed refrigerant in which two or more types of refrigerants having different boiling points are mixed at a predetermined ratio.
A compressor, a condenser, a decompressor, and an evaporator are sequentially connected in a ring shape by a pipe to form a refrigerant circuit, and a plurality of refrigerant temperature detecting means are provided in a pipe from the inlet to the outlet of the evaporator. Saturated steam temperature calculating means for calculating the saturated steam temperature of the refrigerant drawn into the compressor using the plurality of refrigerant temperatures detected by the detecting means, and correcting the saturated steam temperature calculated by the saturated steam temperature calculating means. It has a saturated steam temperature correction means.
【００１４】[0014]
【作用】本発明は、上記手段により次のような作用を有
する。The present invention has the following functions by the above means.
【００１５】すなわち、凝縮器出口から減圧器出口に至
る管路に一端を接続し、他端を蒸発器出口から圧縮機入
口に至る管路に接続したバイパス回路を配設し、このバ
イパス回路に上流側から順に補助減圧器、冷媒温度検出
手段を設け、前記冷媒温度検出手段により冷媒温度を検
出し、用いた冷媒の種類及びその組成比に応じた所定値
を前記冷媒温度に加える飽和蒸気温度補正手段を有する
ことで、非共沸混合冷媒を用いた冷凍サイクルにおい
て、冷凍サイクルの構成を複雑にすることなく圧縮機吸
入冷媒の飽和蒸気温度を簡単に求めることができ、これ
により最適な冷凍サイクル制御の実現を図ることができ
る。That is, a bypass circuit having one end connected to a conduit from the condenser outlet to the decompressor outlet and the other end connected to a conduit from the evaporator outlet to the compressor inlet is provided. An auxiliary decompressor and a refrigerant temperature detecting means are provided in order from the upstream side, the refrigerant temperature is detected by the refrigerant temperature detecting means, and a predetermined value corresponding to the type of refrigerant used and its composition ratio is added to the refrigerant temperature. With the correction means, in a refrigeration cycle using a non-azeotropic mixed refrigerant, the saturated vapor temperature of the refrigerant drawn into the compressor can be easily obtained without complicating the configuration of the refrigeration cycle. Cycle control can be realized.
【００１６】また、蒸発器入口から出口に至る管路に複
数の冷媒温度検出手段を設け、冷媒温度検出手段によっ
て検出された複数の冷媒温度を用いて前記圧縮機に吸入
される冷媒の飽和蒸気温度を算出する飽和蒸気温度算出
手段を有することで、非共沸混合冷媒を用いた冷凍サイ
クルにおいて、バイパス回路を設けることなく圧縮機吸
入冷媒の飽和蒸気温度を簡単に求めることができ、これ
により最適な冷凍サイクル制御の実現を図ることができ
る。Also, a plurality of refrigerant temperature detecting means are provided in a pipe from the inlet to the outlet of the evaporator, and the saturated vapor of the refrigerant sucked into the compressor using the plurality of refrigerant temperatures detected by the refrigerant temperature detecting means. By having the saturated vapor temperature calculating means for calculating the temperature, in a refrigeration cycle using a non-azeotropic mixed refrigerant, the saturated vapor temperature of the refrigerant drawn into the compressor can be easily obtained without providing a bypass circuit. Optimal refrigeration cycle control can be realized.
【００１７】また、蒸発器入口から出口に至る管路に複
数の冷媒温度検出手段を設け、前記冷媒温度検出手段に
よって検出された複数の冷媒温度を用いて前記圧縮機に
吸入される冷媒の飽和蒸気温度を算出する飽和蒸気温度
算出手段及びこの飽和蒸気温度算出手段によって算出さ
れた飽和蒸気温度を補正する飽和蒸気温度補正手段を有
することで、非共沸混合冷媒を用いた冷凍サイクルにお
いて、バイパス回路を設けることなく圧縮機吸入冷媒の
飽和蒸気温度を簡単に精度よく求めることができ、これ
により最適な冷凍サイクル制御の実現を図ることができ
る。Further, a plurality of refrigerant temperature detecting means are provided in a pipe line from an inlet to an outlet of the evaporator, and saturation of the refrigerant sucked into the compressor is performed using the plurality of refrigerant temperatures detected by the refrigerant temperature detecting means. By having a saturated steam temperature calculating means for calculating the steam temperature and a saturated steam temperature correcting means for correcting the saturated steam temperature calculated by the saturated steam temperature calculating means, a bypass in a refrigeration cycle using a non-azeotropic mixed refrigerant is provided. The saturated vapor temperature of the refrigerant drawn into the compressor can be easily and accurately obtained without providing a circuit, thereby realizing optimal refrigeration cycle control.
【００１８】[0018]
【実施例】以下、本発明の実施例について、図面を参考
に説明する。なお、従来の技術の項で説明したものと同
一の機能を有するものには同一の番号を付して詳細な説
明は省略する。Embodiments of the present invention will be described below with reference to the drawings. Note that components having the same functions as those described in the section of the related art are denoted by the same reference numerals, and detailed description thereof will be omitted.
【００１９】図１は、本発明の第１の実施例における冷
凍サイクル図である。同図において、１は圧縮機、２は
凝縮器、３は電動膨張弁、４は蒸発器であり、これらは
順に環状に連結されており、冷媒として非共沸混合冷媒
を用いている。また、５は凝縮器２と電動膨張弁３とを
結ぶ管路に一端を接続し、他端を蒸発器４と圧縮機１と
を結ぶ管路に接続したバイパス回路であり、このバイパ
ス回路５には補助絞り６が設けられている。また、補助
絞り６の下流側の管路上及び圧縮機１の吸入側の管路上
にそれぞれ温度センサ７、８が配設されている。また、
９は温度センサ７で検出した温度ＴＳを受けて補正を加
える飽和蒸気温度補正回路、１０は飽和蒸気温度補正回
路９で補正した値ＴＳ１と温度センサ８で検出した値Ｔ
２を受けて、電動膨張弁３の開度を演算して弁開度信号
を送出する弁開度演算回路であり、この弁開度信号を受
けて膨張弁駆動回路１１にて電動膨張弁３の弁開度を制
御する。FIG. 1 is a refrigeration cycle diagram in the first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a compressor, 2 denotes a condenser, 3 denotes an electric expansion valve, and 4 denotes an evaporator, which are sequentially connected in a ring shape, and use a non-azeotropic mixed refrigerant as a refrigerant. A bypass circuit 5 has one end connected to a pipe connecting the condenser 2 and the electric expansion valve 3 and the other end connected to a pipe connecting the evaporator 4 and the compressor 1. Is provided with an auxiliary aperture 6. Further, temperature sensors 7 and 8 are arranged on a pipe downstream of the auxiliary throttle 6 and on a pipe on the suction side of the compressor 1, respectively. Also,
Reference numeral 9 denotes a saturated steam temperature correction circuit for receiving and correcting the temperature TS detected by the temperature sensor 7, and 10 denotes a value TS1 corrected by the saturated steam temperature correction circuit 9 and a value T detected by the temperature sensor 8.
2 is a valve opening calculating circuit that calculates the opening of the electric expansion valve 3 and sends out a valve opening signal. The expansion valve driving circuit 11 receives the valve opening signal and operates the electric expansion valve 3. Of the valve is controlled.
【００２０】また、同図における冷媒管路のＡ、Ｂ、Ｃ
の位置における冷媒の状態は、図８のポイントＡ、Ｂ、
Ｃであらわされる。Also, A, B, C of the refrigerant pipes in FIG.
The state of the refrigerant at the position is indicated by points A, B,
C.
【００２１】この冷凍サイクルの制御を説明すると、ま
ず所定周期毎に温度センサ７で温度ＴＳを、温度センサ
８で温度Ｔ２を検出し、温度Ｔ２はそのまま弁開度演算
回路１０へ送られるが、温度ＴＳは飽和蒸気温度補正回
路９へ送られる。ＴＳは、図８においてポイントＣの位
置であり、従来の技術の項で説明したように、ポイント
Ｂの冷媒の飽和蒸気温度であるポイントＥの温度よりも
小さな値となる。ポイントＥとポイントＣの温度差は、
用いる冷媒の種類及びその組成比より、公知の混合冷媒
熱物性推算手法にて算出可能であるため、この値をＴＲ
１とすると飽和蒸気温度補正回路９にて飽和蒸気温度の
補正値ＴＳ１を式（ＴＳ１＝ＴＳ＋ＴＲ１）で算出し、
この値を弁開度演算回路１０に送出する。弁開度演算回
路１０においては、温度ＴＳ１、Ｔ２より所定周期毎に
△Ｔを算出し（△Ｔ＝Ｔ２−ＴＳ１）、図７に示す関係
に従って（スーパーヒート量が設定値より大きい場合は
弁開度を大きくし、設定値より小さい場合は弁開度を小
さくする）、電動膨張弁３の弁開度信号を膨張弁駆動回
路１１に送出し、膨張弁駆動回路１１にて電動膨張弁３
の弁開度を制御してスーパーヒート量を設定値に保つ。
このように、冷媒として非共沸混合冷媒を用いた場合で
も、冷凍サイクルの構成を複雑にすることなく圧縮機吸
入冷媒の飽和蒸気温度を精度よく検出することができ、
これにより最適な冷凍サイクル制御の実現を図ることが
できる。The control of the refrigeration cycle will be described. First, the temperature TS is detected by the temperature sensor 7 and the temperature T2 by the temperature sensor 8 at predetermined intervals, and the temperature T2 is directly sent to the valve opening calculation circuit 10. The temperature TS is sent to the saturated steam temperature correction circuit 9. TS is the position of point C in FIG. 8, and has a value smaller than the temperature of point E, which is the saturated vapor temperature of the refrigerant at point B, as described in the section of the related art. The temperature difference between point E and point C is
The value can be calculated by a known mixed refrigerant thermophysical property estimation method from the type of refrigerant used and its composition ratio.
Assuming that 1, a saturated steam temperature correction circuit 9 calculates a saturated steam temperature correction value TS1 by the equation (TS1 = TS + TR1),
This value is sent to the valve opening calculation circuit 10. The valve opening calculation circuit 10 calculates ΔT at predetermined intervals from the temperatures TS1 and T2 (ΔT = T2−TS1), and according to the relationship shown in FIG. 7 (if the superheat amount is larger than the set value, the valve The opening degree is increased, and the valve opening degree is decreased when the opening degree is smaller than the set value.), A valve opening signal of the electric expansion valve 3 is sent to the expansion valve driving circuit 11, and the expansion valve driving circuit 11
To maintain the superheat amount at the set value.
Thus, even when using a non-azeotropic mixed refrigerant as the refrigerant, it is possible to accurately detect the saturated vapor temperature of the refrigerant drawn into the compressor without complicating the configuration of the refrigeration cycle,
This makes it possible to achieve optimal refrigeration cycle control.
【００２２】次に、本発明の第２の実施例について、図
面を参照しながら説明する。図２は、本発明の第２の実
施例における冷凍サイクル図である。同図において、１
２及び１３は蒸発器４を構成する管路の入口及び中間部
付近の冷媒温度を検出する温度センサであり、１４は温
度センサ１２で検出した温度Ｔ３及び温度センサ１３で
検出した温度Ｔ４より飽和蒸気温度を算出する飽和蒸気
温度算出回路である。Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a refrigeration cycle diagram in the second embodiment of the present invention. In the figure, 1
Reference numerals 2 and 13 denote temperature sensors for detecting the temperature of the refrigerant near the inlet and the middle of the conduit constituting the evaporator 4, and reference numeral 14 denotes a temperature T3 detected by the temperature sensor 12 and saturation from the temperature T4 detected by the temperature sensor 13. 4 is a saturated steam temperature calculation circuit for calculating a steam temperature.
【００２３】この冷凍サイクルの制御について説明する
と、まず所定周期毎に温度センサ１２及び１３で温度Ｔ
３及びＴ４を検出してこれらの値を飽和蒸気温度算出回
路１４に送出し、飽和蒸気温度算出回路１４にて温度Ｔ
３及びＴ４を用いて飽和蒸気温度を算出する。この算出
方法について、図面を用いて説明する。図３は、蒸発器
４内の冷媒管路における冷媒温度の変化を示す。同図よ
り明らかなように、非共沸混合冷媒特有の現象として、
蒸発器内では冷媒の蒸発が進行するにつれて温度が上昇
しており、その上昇の割合は直線的である。そして、蒸
発器出口付近で過熱域に入って温度は急激に上昇する。
従って、飽和蒸気温度ＴＳは、式（ＴＳ＝Ｔ３＋（Ｔ４
−Ｔ３）×２）で算出すると、ほぼ真の飽和蒸気温度に
近い値を得ることができる。このようにして算出した温
度ＴＳを弁開度演算回路１０に送出し、弁開度演算回路
１０においては、温度ＴＳ、Ｔ２より所定周期毎に△Ｔ
を算出し（△Ｔ＝Ｔ２−ＴＳ）、図７に示す関係に従っ
て（スーパーヒート量が設定値より大きい場合は弁開度
を大きくし、設定値より小さい場合は弁開度を小さくす
る）、電動膨張弁３の弁開度信号を膨張弁駆動回路１１
に送出し、膨張弁駆動回路１１にて電動膨張弁３の弁開
度を制御してスーパーヒート量を設定値に保つ。The control of the refrigeration cycle will be described. First, the temperature T and the temperature T
3 and T4 are detected, and these values are sent to the saturated steam temperature calculating circuit 14, where the temperature T is calculated.
Calculate the saturated steam temperature using 3 and T4. This calculation method will be described with reference to the drawings. FIG. 3 shows a change in the refrigerant temperature in the refrigerant pipe in the evaporator 4. As is clear from the figure, as a phenomenon peculiar to the non-azeotropic refrigerant mixture,
In the evaporator, the temperature rises as the refrigerant evaporates, and the rate of the rise is linear. Then, the temperature enters the superheated area near the evaporator outlet, and the temperature rises sharply.
Therefore, the saturated steam temperature TS is calculated by the equation (TS = T3 + (T4
-T3) × 2), it is possible to obtain a value close to the true saturated steam temperature. The temperature TS calculated in this manner is sent to the valve opening degree calculation circuit 10, and the valve opening degree calculation circuit 10 calculates ΔT every predetermined period from the temperatures TS and T2.
(ΔT = T2−TS), and according to the relationship shown in FIG. 7 (when the superheat amount is larger than the set value, the valve opening is increased, and when it is smaller than the set value, the valve opening is decreased), A valve opening signal of the electric expansion valve 3 is transmitted to an expansion valve driving circuit 11.
And the expansion valve drive circuit 11 controls the valve opening of the electric expansion valve 3 to maintain the superheat amount at a set value.
【００２４】このように、冷媒として非共沸混合冷媒を
用いた場合でも、新たにバイパス回路を設けることなく
圧縮機吸入冷媒の飽和蒸気温度を簡単に検出することが
でき、これにより最適な冷凍サイクル制御の実現を図る
ことができる。As described above, even when a non-azeotropic mixed refrigerant is used as the refrigerant, the saturated vapor temperature of the refrigerant drawn into the compressor can be easily detected without newly providing a bypass circuit, thereby providing the optimum refrigeration. Cycle control can be realized.
【００２５】次に、本発明の第３の実施例について、図
面を参照しながら説明する。図４は、本発明の第３の実
施例における冷凍サイクル図である。同図において、図
２に示す第２の実施例と異なるのは、飽和蒸気温度演算
回路１４と弁開度演算回路１０との間に飽和蒸気温度補
正回路１５を設けた点である。この飽和蒸気温度補正回
路１５は、飽和蒸気温度演算回路１４で検出した飽和蒸
気温度から所定値ＴＲ２を減じて補正するものである。
これにより蒸発器４から圧縮機１に至る冷媒配管が長
く、圧力損失が大きくて圧縮機１に吸入される冷媒の飽
和蒸気温度が蒸発器４での飽和蒸気温度と異なる場合で
も、精度よくスーパーヒート量を算出して制御を行うこ
とが可能となる。Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a refrigeration cycle diagram in the third embodiment of the present invention. In this figure, the difference from the second embodiment shown in FIG. 2 is that a saturated steam temperature correction circuit 15 is provided between the saturated steam temperature calculation circuit 14 and the valve opening degree calculation circuit 10. The saturated steam temperature correction circuit 15 performs correction by subtracting a predetermined value TR2 from the saturated steam temperature detected by the saturated steam temperature calculation circuit 14.
Accordingly, even if the refrigerant pipe from the evaporator 4 to the compressor 1 is long and the pressure loss is large, and the saturated vapor temperature of the refrigerant sucked into the compressor 1 is different from the saturated vapor temperature in the evaporator 4, the refrigerant can be accurately superposed. The control can be performed by calculating the heat amount.
【００２６】この冷凍サイクルの制御について説明する
と、まず所定周期毎に温度センサ１２及び１３で温度Ｔ
３及びＴ４を検出してこれらの値を飽和蒸気温度算出回
路１４に送出し、飽和蒸気温度算出回路１４にて温度Ｔ
３及びＴ４を用いて上記第２の実施例と同様にして飽和
蒸気温度ＴＳを算出し、算出した温度ＴＳを飽和蒸気温
度補正回路１５に送出して飽和蒸気温度の補正値ＴＳ２
を式（ＴＳ２＝ＴＳ−ＴＲ２）で算出して弁開度演算回
路１０に送出し、弁開度演算回路１０においては、温度
ＴＳ２、Ｔ２より所定周期毎に△Ｔを算出し（△Ｔ＝Ｔ
２−ＴＳ２）、図７に示す関係に従って（スーパーヒー
ト量が設定値より大きい場合は弁開度を大きくし、設定
値より小さい場合は弁開度を小さくする）、電動膨張弁
３の弁開度信号を膨張弁駆動回路１１に送出し、膨張弁
駆動回路１１にて電動膨張弁３の弁開度を制御してスー
パーヒート量を設定値に保つ。The control of the refrigeration cycle will be described. First, the temperature T and the temperature T
3 and T4 are detected, and these values are sent to the saturated steam temperature calculating circuit 14, where the temperature T is calculated.
3 and T4, and calculates the saturated steam temperature TS in the same manner as in the second embodiment. The calculated temperature TS is sent to the saturated steam temperature correction circuit 15 and the saturated steam temperature correction value TS2 is calculated.
Is calculated by the equation (TS2 = TS-TR2) and sent to the valve opening calculation circuit 10. The valve opening calculation circuit 10 calculates ΔT at predetermined intervals from the temperatures TS2 and T2 (ΔT = T
2-TS2), according to the relationship shown in FIG. 7 (when the superheat amount is larger than the set value, the valve opening is increased, and when the superheat amount is smaller than the set value, the valve opening is decreased), and the electric expansion valve 3 is opened. The degree signal is sent to the expansion valve drive circuit 11, and the expansion valve drive circuit 11 controls the valve opening of the electric expansion valve 3 to maintain the superheat amount at a set value.
【００２７】このように、冷媒として非共沸混合冷媒を
用いた場合でも、新たにバイパス回路を設けることなく
圧縮機吸入冷媒の飽和蒸気温度を精度よく検出すること
ができ、これにより最適な冷凍サイクル制御の実現を図
ることができる。As described above, even when a non-azeotropic mixed refrigerant is used as the refrigerant, the saturated vapor temperature of the refrigerant drawn into the compressor can be accurately detected without newly providing a bypass circuit. Cycle control can be realized.
【００２８】なお、上記第１〜第３の実施例において
は、本発明の飽和蒸気温度検出回路で検出した飽和蒸気
温度をスーパーヒート制御に利用した場合について説明
したがそれに限定されるものではなく、例えば検出した
飽和蒸気温度より蒸発器の氷結を推定したり、飽和圧力
への換算式を作成しておき、検出した飽和蒸気温度より
圧縮機吸入圧力を算出して保護制御に利用する等、他の
制御にも利用可能である。In the first to third embodiments, the case where the saturated steam temperature detected by the saturated steam temperature detecting circuit of the present invention is used for superheat control has been described. However, the present invention is not limited to this. For example, estimating the freezing of the evaporator from the detected saturated steam temperature, creating a conversion formula to the saturated pressure, calculating the compressor suction pressure from the detected saturated steam temperature and using it for protection control, etc. It can be used for other controls.
【００２９】また、上記第１の実施例においては、バイ
パス回路５の一端を凝縮器２と減圧器（電動膨張弁３）
とを結ぶ管路の一部に接続したがこれに限定されるもの
ではなく、液冷媒の割合が多くて圧縮機１の吸入側より
高圧となるところであればよい。例えば減圧器が２つに
分割されている場合は２つの減圧器間へ接続してもよ
く、また減圧器がキャピラリチューブの場合ならば、キ
ャピラリチューブの管路上のいずれかの位置へ接続して
もよい。In the first embodiment, one end of the bypass circuit 5 is connected to the condenser 2 and the pressure reducer (the electric expansion valve 3).
However, the present invention is not limited to this, and it is sufficient if the ratio of the liquid refrigerant is large and the pressure is higher than the suction side of the compressor 1. For example, if the pressure reducer is divided into two, it may be connected between the two pressure reducers. If the pressure reducer is a capillary tube, it may be connected to any position on the capillary tube. Is also good.
【００３０】また、上記第２及び第３の実施例において
は、飽和蒸気温度を算出するのに２つの温度センサ１
２、１３を設けたが、それに限定されるものでなく、さ
らにセンサの数を増加させてもよく、また算出式もこれ
に限定されるものではない。In the second and third embodiments, two temperature sensors 1 are used to calculate the saturated steam temperature.
Although 2 and 13 are provided, the present invention is not limited to this, and the number of sensors may be further increased, and the calculation formula is not limited thereto.
【００３１】また、本発明の飽和蒸気温度検出回路は、
フロン系冷媒に限らず非共沸混合冷媒であれば、他の冷
媒にも適用可能である。Also, the saturated steam temperature detecting circuit of the present invention
The present invention is not limited to a chlorofluorocarbon-based refrigerant, and can be applied to other refrigerants as long as they are non-azeotropic mixed refrigerants.
【００３２】[0032]
【発明の効果】上記実施例より明らかなように本発明の
冷凍サイクルの飽和蒸気温度検出回路は、凝縮器出口か
ら減圧器出口に至る管路に一端を接続し、他端を蒸発器
出口から圧縮機入口に至る管路に接続したバイパス回路
を配設し、このバイパス回路に上流側から順に補助減圧
器、冷媒温度検出手段を設け、前記冷媒温度検出手段に
より冷媒温度を検出し、用いた冷媒の種類及びその組成
比に応じた所定値を前記冷媒温度に加える飽和蒸気温度
補正手段を有することで、非共沸混合冷媒を用いた冷凍
サイクルにおいて、冷凍サイクルの構成を複雑にするこ
となく圧縮機吸入冷媒の飽和蒸気温度を簡単に求めるこ
とができ、これにより最適な冷凍サイクル制御の実現を
図ることができる。As is clear from the above embodiment, the circuit for detecting the saturated steam temperature of the refrigeration cycle of the present invention has one end connected to the pipe from the condenser outlet to the pressure reducer outlet, and the other end connected to the evaporator outlet. A bypass circuit connected to a pipeline leading to the compressor inlet was provided, and an auxiliary pressure reducer and a refrigerant temperature detecting means were provided in this order from the upstream side in the bypass circuit, and the refrigerant temperature was detected by the refrigerant temperature detecting means and used. By having a saturated vapor temperature correction means for adding a predetermined value according to the type of refrigerant and its composition ratio to the refrigerant temperature, in a refrigeration cycle using a non-azeotropic mixed refrigerant, without complicating the configuration of the refrigeration cycle The saturated vapor temperature of the refrigerant drawn into the compressor can be easily obtained, thereby realizing optimal refrigeration cycle control.
【００３３】また、蒸発器入口から出口に至る管路に複
数の冷媒温度検出手段を設け、冷媒温度検出手段によっ
て検出された複数の冷媒温度を用いて前記圧縮機に吸入
される冷媒の飽和蒸気温度を算出する飽和蒸気温度算出
手段を有することで、非共沸混合冷媒を用いた冷凍サイ
クルにおいて、バイパス回路を設けることなく圧縮機吸
入冷媒の飽和蒸気温度を簡単に求めることができ、これ
により最適な冷凍サイクル制御の実現を図ることができ
る。Further, a plurality of refrigerant temperature detecting means are provided in a pipe line from an inlet to an outlet of the evaporator, and the saturated vapor of the refrigerant sucked into the compressor using the plurality of refrigerant temperatures detected by the refrigerant temperature detecting means. By having the saturated vapor temperature calculating means for calculating the temperature, in a refrigeration cycle using a non-azeotropic mixed refrigerant, the saturated vapor temperature of the refrigerant drawn into the compressor can be easily obtained without providing a bypass circuit. Optimal refrigeration cycle control can be realized.
【００３４】また、蒸発器入口から出口に至る管路に複
数の冷媒温度検出手段を設け、前記冷媒温度検出手段に
よって検出された複数の冷媒温度を用いて前記圧縮機に
吸入される冷媒の飽和蒸気温度を算出する飽和蒸気温度
算出手段及びこの飽和蒸気温度算出手段によって算出さ
れた飽和蒸気温度を補正する飽和蒸気温度補正手段を有
することで、非共沸混合冷媒を用いた冷凍サイクルにお
いて、バイパス回路を設けることなく圧縮機吸入冷媒の
飽和蒸気温度を簡単に精度よく求めることができ、これ
により最適な冷凍サイクル制御の実現を図ることができ
る。Further, a plurality of refrigerant temperature detecting means are provided in a pipeline extending from the inlet to the outlet of the evaporator, and saturation of the refrigerant sucked into the compressor is performed using the plurality of refrigerant temperatures detected by the refrigerant temperature detecting means. By having a saturated steam temperature calculating means for calculating the steam temperature and a saturated steam temperature correcting means for correcting the saturated steam temperature calculated by the saturated steam temperature calculating means, a bypass in a refrigeration cycle using a non-azeotropic mixed refrigerant is provided. The saturated vapor temperature of the refrigerant drawn into the compressor can be easily and accurately obtained without providing a circuit, thereby realizing optimal refrigeration cycle control.
【図１】本発明の飽和蒸気温度検出回路の第１の実施例
における冷凍サイクル図FIG. 1 is a refrigeration cycle diagram of a first embodiment of a saturated steam temperature detection circuit according to the present invention.
【図２】本発明の飽和蒸気温度検出回路の第２の実施例
における冷凍サイクル図FIG. 2 is a refrigeration cycle diagram in a second embodiment of the saturated steam temperature detection circuit of the present invention.
【図３】同実施例における蒸発器内の冷媒温度変化を示
す特性図FIG. 3 is a characteristic diagram showing a change in refrigerant temperature in an evaporator in the embodiment.
【図４】本発明の飽和蒸気温度検出回路の第３の実施例
における冷凍サイクル図FIG. 4 is a refrigeration cycle diagram in a third embodiment of the saturated steam temperature detection circuit of the present invention.
【図５】従来の飽和蒸気温度検出回路の冷凍サイクル図FIG. 5 is a refrigeration cycle diagram of a conventional saturated steam temperature detection circuit.
【図６】同飽和蒸気温度検出回路におけるＰ−ｈ線図上
の冷凍サイクル図FIG. 6 is a refrigeration cycle diagram on a Ph diagram in the saturated steam temperature detection circuit.
【図７】スーパーヒート量と電動膨張弁の弁開度変更量
との関係図FIG. 7 is a relationship diagram between a superheat amount and a change amount of a valve opening of an electric expansion valve.
【図８】従来の飽和蒸気温度検出回路における非共沸混
合冷媒を用いた場合のＰ−ｈ線図上の冷凍サイクル図FIG. 8 is a refrigeration cycle diagram on a Ph diagram when a non-azeotropic refrigerant mixture is used in a conventional saturated steam temperature detection circuit.
１ 圧縮機 ２ 凝縮器 ３ 電動膨張弁（減圧器） ４ 蒸発器 ５ バイパス回路 ６ 補助絞り（補助減圧器） ７ 温度センサ（冷媒温度検出手段） ９ 飽和蒸気温度補正回路（飽和蒸気温度補正手段） １２ 温度センサ（第１の冷媒温度検出手段） １３ 温度センサ（第２の冷媒温度検出手段） １４ 飽和蒸気温度算出回路（飽和蒸気温度算出手段） １５ 飽和蒸気温度補正回路（飽和蒸気温度補正手段） DESCRIPTION OF SYMBOLS 1 Compressor 2 Condenser 3 Electric expansion valve (decompressor) 4 Evaporator 5 Bypass circuit 6 Auxiliary throttle (auxiliary decompressor) 7 Temperature sensor (refrigerant temperature detection means) 9 Saturated steam temperature correction circuit (Saturated steam temperature correction means) 12 temperature sensor (first refrigerant temperature detecting means) 13 temperature sensor (second refrigerant temperature detecting means) 14 saturated steam temperature calculating circuit (saturated steam temperature calculating means) 15 saturated steam temperature correcting circuit (saturated steam temperature correcting means)
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小林 義典 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 (56)参考文献 特開 平７−174419（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) F25B 1/00 F25B 49/02 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinori Kobayashi 1006 Kazuma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-7-174419 (JP, A) (58) Field (Int.Cl. 7 , DB name) F25B 1/00 F25B 49/02
Claims (5)
媒を所定の比率で混合した非共沸混合冷媒を用い、圧縮
機、凝縮器、減圧器、蒸発器を順に配管にて環状に連結
して冷媒回路を構成し、凝縮器出口から減圧器出口に至
る管路に一端を接続し、他端を蒸発器出口から圧縮機入
口に至る管路に接続したバイパス回路を配設し、このバ
イパス回路に上流側から順に補助減圧器、冷媒温度検出
手段を設け、前記冷媒温度検出手段により冷媒温度を検
出し、用いた冷媒の種類及びその組成比に応じた所定値
を前記冷媒温度に加える飽和蒸気温度補正手段を有する
冷凍サイクルの飽和蒸気温度検出装置。1. A non-azeotropic mixed refrigerant in which two or more types of refrigerants having different boiling points are mixed at a predetermined ratio as a refrigerant, and a compressor, a condenser, a decompressor, and an evaporator are connected in a ring by piping in order. A bypass circuit having one end connected to a conduit from the condenser outlet to the decompressor outlet and the other end connected to a conduit from the evaporator outlet to the compressor inlet. The circuit is provided with an auxiliary pressure reducer and refrigerant temperature detecting means in order from the upstream side, the refrigerant temperature is detected by the refrigerant temperature detecting means, and a predetermined value corresponding to the type of refrigerant used and its composition ratio is added to the refrigerant temperature. A saturated steam temperature detecting device for a refrigeration cycle having steam temperature correcting means.
媒を所定の比率で混合した非共沸混合冷媒を用い、圧縮
機、凝縮器、減圧器、蒸発器を順に配管にて環状に連結
して冷媒回路を構成し、前記蒸発器入口から出口に至る
管路に複数の冷媒温度検出手段を設け、前記冷媒温度検
出手段によって検出された複数の冷媒温度を用いて前記
圧縮機に吸入される冷媒の飽和蒸気温度を算出する飽和
蒸気温度算出手段及びこの飽和蒸気温度算出手段によっ
て算出された飽和蒸気温度を補正する飽和蒸気温度補正
手段を有する冷凍サイクルの飽和蒸気温度検出装置。 2. A non-azeotropic mixed refrigerant in which two or more refrigerants having different boiling points are mixed at a predetermined ratio as a refrigerant, and a compressor, a condenser, a decompressor, and an evaporator are sequentially connected in a ring by piping. A refrigerant circuit, and a plurality of refrigerant temperature detecting means are provided in a pipe from the evaporator inlet to the outlet, and the refrigerant is sucked into the compressor using the plurality of refrigerant temperatures detected by the refrigerant temperature detecting means. A saturated steam temperature detecting device for a refrigeration cycle, comprising: a saturated steam temperature calculating means for calculating a saturated steam temperature of a refrigerant; and a saturated steam temperature correcting means for correcting the saturated steam temperature calculated by the saturated steam temperature calculating means.
付近に第１の冷媒温度検出手段、中間部付近に第２の冷
媒温度検出手段を設け、飽和蒸気温度算出手段において
下式を用いて飽和蒸気温度を算出する請求項２記載の冷
凍サイクルの飽和蒸気温度検出装置。 ＴＳ＝Ｔ３＋（Ｔ４−Ｔ３）×２ ただし、Ｔ３は第１の冷媒温度検出手段によって検出さ
れた温度、Ｔ４は第２の冷媒温度検出手段によって検出
された温度、ＴＳは飽和蒸気温度をあらわす。 3. A first refrigerant temperature detecting means is provided near an inlet of a pipe line from an inlet to an outlet of an evaporator, and a second refrigerant temperature detecting means is provided near an intermediate portion. The apparatus for detecting a saturated steam temperature of a refrigeration cycle according to claim 2 , wherein the saturated steam temperature is calculated using the saturated steam temperature. TS = T3 + (T4−T3) × 2 where T3 represents the temperature detected by the first refrigerant temperature detecting means, T4 represents the temperature detected by the second refrigerant temperature detecting means, and TS represents the saturated vapor temperature.
度算出手段にて算出された飽和蒸気温度より所定値を減
じて補正する請求項２記載の冷凍サイクルの飽和蒸気温
度検出装置。 4. The apparatus for detecting a saturated steam temperature of a refrigeration cycle according to claim 2, wherein said saturated steam temperature correcting means performs correction by subtracting a predetermined value from the saturated steam temperature calculated by said saturated steam temperature calculating means.
媒を所定の比率で混合した非共沸混合冷媒を用い、圧縮Using a non-azeotropic mixed refrigerant in which the medium is mixed at a predetermined ratio,
機、凝縮器、減圧器、蒸発器を順に配管にて環Machine, condenser, decompressor, and evaporator in order with piping 状に連結Concatenated
して冷媒回路を構成し、前記蒸発器の入口から出口に至To form a refrigerant circuit, from the inlet to the outlet of the evaporator.
る管路の入口付近に第１の冷媒温度検出手段、中間部付A first refrigerant temperature detecting means near the inlet of the pipe
近に第２の冷媒温度検出手段を設け、前記飽和蒸気温度A second refrigerant temperature detecting means is provided in the vicinity, and the saturated vapor temperature
算出手段において下式を用いて前記圧縮機に吸入されるCalculated means is drawn into the compressor using the following formula
冷媒の飽和蒸気温度を算出する冷凍サイクルの飽和蒸気Refrigeration cycle saturated steam for calculating refrigerant saturated steam temperature
温度検出装置。Temperature detector. ＴＳ＝Ｔ３＋（Ｔ４−Ｔ３）×２TS = T3 + (T4-T3) × 2 ただし、Ｔ３は第１の冷媒温度検出手段によって検出さHowever, T3 is detected by the first refrigerant temperature detecting means.
れた温度、Ｔ４は第２の冷媒温度検出手段によって検出Temperature, T4 is detected by the second refrigerant temperature detecting means.
された温度、ＴＳは飽和蒸気温度をあらわす。The indicated temperature, TS, represents the saturated steam temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32913093A JP3351076B2 (en) | 1993-12-24 | 1993-12-24 | Refrigeration cycle saturated steam temperature detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32913093A JP3351076B2 (en) | 1993-12-24 | 1993-12-24 | Refrigeration cycle saturated steam temperature detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07190506A JPH07190506A (en) | 1995-07-28 |
| JP3351076B2 true JP3351076B2 (en) | 2002-11-25 |
Family
ID=18217963
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32913093A Expired - Fee Related JP3351076B2 (en) | 1993-12-24 | 1993-12-24 | Refrigeration cycle saturated steam temperature detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3351076B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001033147A1 (en) * | 1999-11-02 | 2001-05-10 | Xdx, Llc Et Al. | Vapor compression system and method for controlling conditions in ambient surroundings |
| KR100575223B1 (en) * | 2005-01-17 | 2006-05-02 | 삼성전자주식회사 | Variable capacity refrigeration cycle |
| JP2009174803A (en) * | 2008-01-25 | 2009-08-06 | Okamura Corp | Central control system for freezing and refrigerating equipment |
| JP2009174802A (en) * | 2008-01-25 | 2009-08-06 | Okamura Corp | Central control system for freezing and refrigerating equipment |
| JP5403918B2 (en) * | 2008-01-25 | 2014-01-29 | 株式会社岡村製作所 | Centralized management system for freezing and refrigeration equipment |
| CN102661640B (en) * | 2012-05-08 | 2014-03-12 | 雷宜东 | Three-way thermostatic expansion valve |
| CN103335134A (en) * | 2013-07-03 | 2013-10-02 | 无锡宇吉科技有限公司 | Constant temperature adjusting device |
| CN104344927B (en) * | 2013-07-29 | 2017-12-08 | 珠海格力电器股份有限公司 | Pre- pressure-measuring pipe road pressure sensor attachment structure and pressure sensor assembling component |
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1993
- 1993-12-24 JP JP32913093A patent/JP3351076B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07190506A (en) | 1995-07-28 |
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