JPH07113492B2 - Refrigeration equipment - Google Patents
Refrigeration equipmentInfo
- Publication number
- JPH07113492B2 JPH07113492B2 JP62139939A JP13993987A JPH07113492B2 JP H07113492 B2 JPH07113492 B2 JP H07113492B2 JP 62139939 A JP62139939 A JP 62139939A JP 13993987 A JP13993987 A JP 13993987A JP H07113492 B2 JPH07113492 B2 JP H07113492B2
- Authority
- JP
- Japan
- Prior art keywords
- hot gas
- evaporator
- opening
- temperature
- opening degree
- 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 - Lifetime
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
Landscapes
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Air Conditioning Control Device (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は冷凍輸送ユニット等に好適な冷凍装置に関す
る。TECHNICAL FIELD The present invention relates to a refrigerating apparatus suitable for a refrigerating transport unit and the like.
（従来の技術） 従来のこの種冷凍装置の系統図が第６図に示されてい
る。(Prior Art) A system diagram of a conventional refrigeration system of this kind is shown in FIG.
圧縮機１から吐出された高温・高圧の冷媒ガスは凝縮器
２に入り、ここで凝縮器用ファン４によって送風される
外気に放熱することにより凝縮液化して高温・高圧の液
冷媒となる。この液冷媒は温度式膨張弁６に入り、ここ
で絞られることにより断熱膨張して低温・低圧の気液二
相となる。次いで、この気液二相の冷媒は蒸発器３に入
り、ここで蒸発器用ファン５によって送風される室内空
気を冷却することによって蒸発気化して低温・低圧の冷
媒ガスとなり、圧縮機１に戻る。The high-temperature, high-pressure refrigerant gas discharged from the compressor 1 enters the condenser 2, where it radiates heat to the outside air blown by the condenser fan 4 to be condensed and liquefied into a high-temperature, high-pressure liquid refrigerant. This liquid refrigerant enters the thermal expansion valve 6 and is throttled here to adiabatically expand into a low-temperature low-pressure gas-liquid two-phase. Next, the gas-liquid two-phase refrigerant enters the evaporator 3, where the room air blown by the evaporator fan 5 is cooled to evaporate and become a low-temperature low-pressure refrigerant gas, and then return to the compressor 1. .
温度式膨張弁６は均圧管７を介して導入された蒸発器３
出口の冷媒圧力と、感温筒８で検知された蒸発器３出口
の冷媒温度に対応する飽和圧力との差に応じてその開度
が自動的に制御され、温度式膨張弁６を流過する冷媒量
を加減することによって蒸発器３出口における冷媒の過
熱度を一定値に維持する。The temperature type expansion valve 6 is an evaporator 3 introduced through a pressure equalizing pipe 7.
The opening is automatically controlled according to the difference between the refrigerant pressure at the outlet and the saturation pressure corresponding to the refrigerant temperature at the outlet of the evaporator 3 detected by the temperature-sensitive cylinder 8, and the temperature type expansion valve 6 is passed through. The superheat degree of the refrigerant at the outlet of the evaporator 3 is maintained at a constant value by adjusting the amount of the refrigerant to be discharged.
冷凍能力を制御する場合には、圧縮機１から吐出された
冷媒ガスの一部をホットガスバイパス回路９及びこれに
介装されたホットガス制御弁10を経て蒸発器３にバイパ
スさせる。ホットガス制御弁10は制御装置11によってそ
の開度が自動的に制御される。即ち、温度検知器12によ
って検知された室内空気温度が制御器装置11に設定され
た設定温度より低い場合には、ホットガス制御弁10の開
度が大きくなって、ホットガスバイパス回路９を通って
蒸発器３にバイパスされる高温のガス冷媒量が増大して
蒸発器３の冷却能力が低下するので、室内空気温度は設
定温度に維持される。When controlling the refrigerating capacity, a part of the refrigerant gas discharged from the compressor 1 is bypassed to the evaporator 3 via the hot gas bypass circuit 9 and the hot gas control valve 10 interposed therein. The opening degree of the hot gas control valve 10 is automatically controlled by the control device 11. That is, when the indoor air temperature detected by the temperature detector 12 is lower than the set temperature set in the controller device 11, the opening degree of the hot gas control valve 10 becomes large and the hot gas bypass circuit 9 is passed through. Since the amount of high-temperature gas refrigerant bypassed to the evaporator 3 increases and the cooling capacity of the evaporator 3 decreases, the indoor air temperature is maintained at the set temperature.
（発明が解決しようとする問題点） 上記従来の冷凍装置においては、蒸発器３の出口におけ
る冷媒の過熱度は冷凍能力の制御の有無に拘らず温度式
膨張弁６によって一定値に維持されるため、冷凍能力を
低減した場合にも冷媒循環量は殆ど減らないので、圧縮
機１を駆動するのに要する電力を無駄に消費するという
問題があった。(Problems to be Solved by the Invention) In the above conventional refrigeration system, the superheat degree of the refrigerant at the outlet of the evaporator 3 is maintained at a constant value by the thermal expansion valve 6 regardless of whether or not the refrigerating capacity is controlled. Therefore, even if the refrigerating capacity is reduced, the refrigerant circulation amount hardly decreases, and there is a problem that the electric power required to drive the compressor 1 is wasted.
（問題点を解決するための手段） 本発明は上記問題点を解決するために発明されたもので
あって、その要旨とするところは、圧縮機と、凝縮器
と、蒸発器と、この蒸発器出口の冷媒過熱度を検出する
過熱度検出手段と、上記蒸発器出口の過熱度を制御する
電子式膨張弁と、上記圧縮機から吐出されたホットガス
をバイパスさせて上記蒸発器に導くホットガスバイパス
回路と、このホットガスバイパス回路を通るホットガス
の量を制御するホットガス制御弁と、上記蒸発器によっ
て冷却される被冷却対象の温度を検知する温度検知器と
を具備する冷凍装置において、上記ホットガス制御弁の
開度を被冷却対象温度と設定温度との差に応じて決定す
るMV開度決定手段と、このMV開度決定手段で決定された
ホットガス制御弁の開度が設定手段により設定された全
閉と全閉に近い特定開度との範囲内にあるか否かを判定
するMV開度範囲比較手段と、範囲内にないと判定された
とき上記電子式膨張弁の過熱度制御目標値を変更するSH
目標値設定手段と、変更された過熱度制御目標値に基づ
いて上記電子式膨張弁の開度を決定するEEV開度決定手
段を有する制御装置を設けたことを特徴とする冷凍装置
にある。(Means for Solving Problems) The present invention has been invented to solve the above problems, and its gist is to include a compressor, a condenser, an evaporator, and Superheat detection means for detecting the refrigerant superheat degree of the outlet, an electronic expansion valve for controlling the superheat degree of the evaporator outlet, hot to bypass the hot gas discharged from the compressor to the evaporator A refrigerating apparatus comprising a gas bypass circuit, a hot gas control valve for controlling the amount of hot gas passing through the hot gas bypass circuit, and a temperature detector for detecting the temperature of an object to be cooled which is cooled by the evaporator. The MV opening degree determining means for determining the opening degree of the hot gas control valve according to the difference between the temperature to be cooled and the set temperature, and the opening degree of the hot gas control valve determined by the MV opening degree determining means are By setting means MV opening range comparison means for determining whether or not it is within the range of the fixed fully closed and the specific opening close to the fully closed, and the degree of superheat of the electronic expansion valve when it is determined not to be within the range SH to change the control target value
The refrigeration apparatus is provided with a control device having a target value setting means and an EEV opening degree determining means for determining the opening degree of the electronic expansion valve based on the changed superheat control target value.
（作用） 本発明においては、冷凍装置の運転時、冷媒は圧縮機
と、凝縮器、電子式膨張弁、蒸発器をこの順に循環し、
蒸発器出口の冷媒過熱度は電子膨張弁によって制御され
る。そして、ホットガスバイパス回路を通るホットガス
の量をホットガス制御弁21によって制御することによっ
て冷凍能力が制御される。(Operation) In the present invention, during operation of the refrigeration system, the refrigerant circulates through the compressor, the condenser, the electronic expansion valve, and the evaporator in this order,
The degree of refrigerant superheat at the outlet of the evaporator is controlled by an electronic expansion valve. Then, the refrigerating capacity is controlled by controlling the amount of hot gas passing through the hot gas bypass circuit by the hot gas control valve 21.
冷凍能力制御時、ホットガス制御弁の開度はMV開度決定
手段により被冷却対象の温度と設定温度との差に応じて
決定され、決定された開度が設定手段により設定された
範囲内にないとMV開度範囲比較手段によって判定された
とき、電子式膨張弁の過熱度制御目標値はSH目標値設定
手段により変更され、この変更された過熱度制御目標値
に基づいて電子式膨張弁の開度が決定される。During refrigeration capacity control, the opening of the hot gas control valve is determined by the MV opening determination means according to the difference between the temperature of the object to be cooled and the set temperature, and the determined opening is within the range set by the setting means. If it is determined by the MV opening range comparison means, the superheat control target value of the electronic expansion valve is changed by the SH target value setting means, and the electronic expansion based on the changed superheat control target value. The valve opening is determined.
この結果、電子式膨張弁が冷媒循環量を調整して冷凍能
力を制御するので、ホットガス制御弁は全閉と全閉に近
い特定範囲との間の狭い範囲内で開閉される。As a result, the electronic expansion valve adjusts the refrigerant circulation amount to control the refrigerating capacity, so that the hot gas control valve is opened / closed within a narrow range between the fully closed position and the specific range close to the fully closed position.
（実施例） 本発明の１実施例を第１図ないし第５図を参照しながら
具体的に説明する。(Embodiment) An embodiment of the present invention will be specifically described with reference to FIGS. 1 to 5.
第１図には系統図が示され、１は圧縮機、２は凝縮器、
３は蒸発器、４は凝縮器用ファン、５は蒸発器用ファ
ン、９はホットガスバイパス回路で、以上は第６図に示
す従来のものと同様である。20は電子式膨張弁（以下、
EEVと呼ぶ）、21は電子式ホットガス制御弁（以下、MV
と呼ぶ）、22は空気温度検知器、23はEEV20及びMV21の
開度調整を行う制御装置、24は蒸発器３出口の冷媒圧力
を検知する圧力検知器、25は蒸発器３出口の冷媒温度を
検知する温度検知器である。A system diagram is shown in FIG. 1, where 1 is a compressor, 2 is a condenser,
3 is an evaporator, 4 is a condenser fan, 5 is an evaporator fan, and 9 is a hot gas bypass circuit. The above is the same as the conventional one shown in FIG. 20 is an electronic expansion valve (hereinafter,
21 is an electronic hot gas control valve (hereinafter referred to as MV)
, 22 is an air temperature detector, 23 is a control device that adjusts the opening of EEV20 and MV21, 24 is a pressure detector that detects the refrigerant pressure at the outlet of the evaporator 3, and 25 is the temperature of the refrigerant at the outlet of the evaporator 3. This is a temperature detector for detecting.
空気温度検知器22で検知された室内空気温度は制御装置
23で設定温度と比較され、室内空気温度が設定温度より
高い場合には制御装置23から指令によりMV21の開度が小
さくなり、逆に、室内空気温度が設定温度より低い場合
にはMV21の開度が大きくなる。この結果、ホットガスバ
イパス回路９を経てバイパスされる冷媒ガスの量が増減
されるので蒸発器３の冷凍能力が調整される。また、こ
の制御装置23はMV21の開度が小さく、かつ、狭い範囲で
調整されるようにEEV20の開度を制御し、蒸発器３の出
口における過熱度（以下、SHと呼ぶ）を制御する。The indoor air temperature detected by the air temperature detector 22 is a control device.
At 23, the temperature is compared with the set temperature, and if the indoor air temperature is higher than the set temperature, the opening degree of the MV21 is decreased by a command from the control device 23, and conversely, if the indoor air temperature is lower than the set temperature, the MV21 is opened. The degree increases. As a result, the amount of the refrigerant gas bypassed through the hot gas bypass circuit 9 is increased or decreased, so that the refrigerating capacity of the evaporator 3 is adjusted. Further, the control device 23 controls the opening degree of the EEV 20 so that the opening degree of the MV 21 is small and is adjusted in a narrow range, and controls the superheat degree (hereinafter, referred to as SH) at the outlet of the evaporator 3. .
制御装置23の機能ブロック図が第２図に、フローチャー
トが第３図に示されている。A functional block diagram of the control device 23 is shown in FIG. 2, and a flowchart thereof is shown in FIG.
空気温度検知器22で検知された空気温度及び温度設定器
26で設定された設定温度は温度比較手段27に送られ、こ
こで比較される。比較結果はMV開度決定手段28に送られ
て、ここでMV21の開度が決定される。MV21の開度はMV開
度出力手段29を介してMV21に出力される。Air temperature detected by air temperature detector 22 and temperature setter
The set temperature set in 26 is sent to the temperature comparison means 27 and compared there. The comparison result is sent to the MV opening determination means 28, where the opening of the MV 21 is determined. The opening of the MV21 is output to the MV21 via the MV opening output means 29.
圧力検知器24で検知された蒸発器３出口の冷媒圧力及び
温度検知器25で検知された蒸発器３出口の冷媒温度はSH
検出手段30に送られ、ここで蒸発器３出口の冷媒の過熱
度SHが検出され、この過熱度はSH目標値設定手段31に入
力される。The refrigerant pressure at the outlet of the evaporator 3 detected by the pressure detector 24 and the refrigerant temperature at the outlet of the evaporator 3 detected by the temperature detector 25 are SH.
The superheat degree SH of the refrigerant at the outlet of the evaporator 3 is detected and sent to the detection means 30, and this superheat degree is input to the SH target value setting means 31.
MV21の開度が全閉時の冷凍能力SP2（第４図及び第５図
参照）がSP2設定手段32で設定され、MV21の開度が全閉
に近い場合の冷凍能力SP1（第４図及び第５図参照）がS
P1設定手段33で設定される。The refrigerating capacity SP 2 when the opening of the MV21 is fully closed (see FIGS. 4 and 5) is set by the SP 2 setting means 32, and the refrigerating capacity SP 1 when the opening of the MV21 is close to fully closed (the first 4 and 5) is S
It is set by the P 1 setting means 33.
そして、これら設定値SP2及びSP1はMV開度範囲比較手段
34に入力され、ここでMV開度決定手段28から入力された
MV21の開度と比較される。この比較結果はSH目標値設定
手段31に入力され、ここでMV21の開度がSP1ラインとSP2
ラインとの間にあるときはSHの目標値が固定され、MV21
の開度がSP1ラインとSP2ラインとの間にないときはSHの
目標値が変更される。このSH目標値はEEV開度決定手段3
5に入力され、ここでEEV20の開度が決定され、この開度
はEEV開度出力手段36を経て出力される。Then, these set values SP 2 and SP 1 are MV opening range comparison means.
34, where it is input from the MV opening determination means 28
It is compared with the opening of MV21. This comparison result is input to the SH target value setting means 31, where the opening of MV21 is SP 1 line and SP 2
The target value of SH is fixed when it is between the line and MV21
If the opening of is not between the SP 1 and SP 2 lines, the SH target value is changed. This SH target value is EEV opening determination means 3
5, the opening of the EEV 20 is determined, and this opening is output via the EEV opening output means 36.
第４図及び第５図に示すように、蒸発器３の容量が同じ
であってもその出口の冷媒のSHの最大、即ち、蒸発器３
を流過する冷媒流量の減少に伴って蒸発器３の冷凍能力
が低下し、また、圧縮機１の消費電力が小さくなる。As shown in FIGS. 4 and 5, even if the capacity of the evaporator 3 is the same, the maximum SH of the refrigerant at the outlet, that is, the evaporator 3
The refrigerating capacity of the evaporator 3 is reduced and the power consumption of the compressor 1 is reduced as the flow rate of the refrigerant flowing through the compressor is reduced.
そこで、冷凍能力の低減時、例えば、所要の冷凍能力が
Ｑの場合、EEV20のSH目標値を変更して大きくすること
によってEEV20の開度を小さくする。そして、SH目標がS
P1ラインとSP2ラインとの間に入ると、EEV20のSH目標値
はその値に固定され、室内空気温度の制御は主としてMV
21の開度をSP1ラインとSP2ラインとの間で増減すること
によって行われる。MV21の開度がSP2ラインに達する
と、EEV20のSH目標値が大きくなるように変更され、MV2
1の開度がSP1ラインに達するとEEV20のSH目標値が小さ
くなるように変更され、かくして、EEV20の開度が再調
整される。なお、SHの目標値の増減は一定時間間隔をお
いて所定量だけ増加又は減少させることができる。Therefore, when the refrigerating capacity is reduced, for example, when the required refrigerating capacity is Q, the SH target value of the EEV 20 is changed and increased to reduce the opening degree of the EEV 20. And SH target is S
When entering between the P 1 line and the SP 2 line, the SH target value of the EEV20 is fixed at that value, and the indoor air temperature is controlled mainly by the MV.
It is performed by increasing or decreasing the opening degree of 21 between the SP 1 line and the SP 2 line. When the opening of MV21 reaches the SP 2 line, the SH target value of EEV20 is changed to increase, and MV2
When the opening of 1 reaches the SP 1 line, the SH target value of the EEV20 is changed to be small, and thus the opening of the EEV20 is readjusted. The SH target value can be increased or decreased by a predetermined amount at fixed time intervals.
つまり、室内空気温度の調整はMV21の開度をSP1ライン
とSP2ラインとの間で開閉することによって行い、EEV20
の開度はMV21の開度がSP1ラインとSP2ラインとの間に入
るように調整される。しかし、EEV20の開度調整にはSH
の上限値（SPa）及び下限値（SPb）を設け、EEV20の開
度調整によってSHがこれら上限値（SPa）又は下限値（S
Pb）に到達した場合には、MV21の開度がSP1ラインとSP2
ラインとの間になくともSHの目標値は変更しない。SHの
上限値SPaは冷媒回路を循環する冷媒量が極端に少なく
なって、圧縮機１が過熱したり、冷凍機油が圧縮機１に
戻らなかったりするのを防止するために設けられる。SH
の下限値SPbは圧縮機１への液戻りを防止するために設
けられる。In other words, the indoor air temperature is adjusted by opening and closing the MV21 opening between the SP 1 line and SP 2 line, and the EEV20
The opening of is adjusted so that the opening of MV21 is between the SP 1 line and the SP 2 line. However, to adjust the opening of EEV20, SH
The upper limit value (SPa) and the lower limit value (SPb) are set, and SH adjusts the opening degree of EEV20 so that SH can set these upper limit value (SPa) or lower limit value (S
Pb) is reached, the opening of MV21 changes to SP 1 line and SP 2
The target value of SH is not changed even if it is not between the lines. The upper limit value SPa of SH is provided in order to prevent the compressor 1 from overheating and the refrigerating machine oil from returning to the compressor 1 due to an extremely small amount of refrigerant circulating in the refrigerant circuit. SH
The lower limit value SPb is set to prevent the liquid from returning to the compressor 1.
かくして、冷凍能力制御時、ホットガス制御弁21は被冷
却対象の温度、即ち、室内空気温度とその設定温度との
差に応じて開度調整され、このホットガス制御弁21の開
度に応じて電子式膨張弁20の過熱度制御目標値が変更さ
れる。Thus, during the refrigerating capacity control, the hot gas control valve 21 is adjusted in opening degree according to the temperature of the object to be cooled, that is, the difference between the indoor air temperature and its set temperature, and according to the opening degree of the hot gas control valve 21. The target value of superheat control of the electronic expansion valve 20 is changed.
これにより、電子式膨張弁20によって蒸発器３に供給さ
れる冷媒流量、即ち、冷凍能力が増減されるので、ホッ
トガス制御弁21は全閉と全閉に近い特定開度との間の狭
い範囲内で開閉されて室内空気温度を設定温度に維持す
る。As a result, the flow rate of the refrigerant supplied to the evaporator 3 by the electronic expansion valve 20, that is, the refrigerating capacity is increased / decreased, so that the hot gas control valve 21 is narrow between fully closed and a specific opening close to fully closed. It is opened and closed within the range to maintain the indoor air temperature at the set temperature.
従って、冷凍能力制御時、ホットガスバイパス回路９を
経てバイパスされる冷媒量が少なくなり、この結果、圧
縮機１の消費電力が少なくなる。Therefore, when the refrigerating capacity is controlled, the amount of refrigerant bypassed through the hot gas bypass circuit 9 is reduced, and as a result, the power consumption of the compressor 1 is reduced.
（発明の効果） 本発明においては、冷凍能力制御時、電子式膨張弁の過
熱度制御目標値を変更することによってホットガス制御
弁の開度が設定手段により設定された全閉と全閉に近い
特定開度との間の狭い範囲に入るように電子膨張弁の開
度を制御するので、この電子膨張弁により蒸発器を流過
する冷媒の流量、即ち、冷凍能力を制御することができ
る。(Effects of the Invention) In the present invention, during refrigeration capacity control, the opening degree of the hot gas control valve is set to fully closed or fully closed by the setting means by changing the superheat control target value of the electronic expansion valve. Since the opening of the electronic expansion valve is controlled so as to fall within a narrow range between the close specific opening, the flow rate of the refrigerant flowing through the evaporator, that is, the refrigerating capacity can be controlled by the electronic expansion valve. .
従って、ホットガスバイパス回路を経てバイパスされる
冷媒を少なくすることが可能となり、この結果、圧縮機
から吐出される冷媒の量を減らすことができるので、圧
縮機の消費電力を低減することができる。Therefore, it is possible to reduce the amount of refrigerant bypassed through the hot gas bypass circuit, and as a result, the amount of refrigerant discharged from the compressor can be reduced, so that the power consumption of the compressor can be reduced. .
第１図ないし第５図は本発明の１実施例を示し、第１図
は冷凍装置の系統図、第２図は制御装置の機能ブロック
図、第３図は制御装置のフローチャート、第４図は蒸発
器出口の冷媒過熱度に対する冷凍能力及び圧縮機の消費
電力との関係を示す線図、第５図は第４図の部分拡大図
である。第６図は従来の冷凍装置の系統図である。 圧縮機……１、凝縮器……２、電子式膨張弁……20、蒸
発器……３、ホットガスバイパス回路……９、ホットガ
ス制御弁……21、制御装置……23、過熱度制御目標値の
設定手段……311 to 5 show one embodiment of the present invention, FIG. 1 is a system diagram of a refrigerating apparatus, FIG. 2 is a functional block diagram of a control apparatus, FIG. 3 is a flow chart of the control apparatus, and FIG. Is a diagram showing the relationship between the refrigerant superheat degree at the evaporator outlet and the refrigerating capacity and the power consumption of the compressor, and FIG. 5 is a partially enlarged view of FIG. FIG. 6 is a system diagram of a conventional refrigeration system. Compressor …… 1, condenser …… 2, electronic expansion valve …… 20, evaporator …… 3, hot gas bypass circuit …… 9, hot gas control valve …… 21, control unit …… 23, superheat degree Control target value setting means …… 31
───────────────────────────────────────────────────── フロントページの続き (72)発明者 佐藤 進司 愛知県名古屋市中村区岩塚町字高道１番地 三菱重工業株式会社名古屋研究所内 (72)発明者 小川 広志 愛知県名古屋市中村区岩塚町字高道１番地 三菱重工業株式会社名古屋研究所内 (56)参考文献 特開 昭60−108648（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinji Sato No. 1 Takamichi, Iwazuka-cho, Nakamura-ku, Nagoya, Aichi Prefecture, Nagoya Research Institute, Mitsubishi Heavy Industries, Ltd. (72) Hiroshi Ogawa, Iwatsuka-machi, Nakamura-ku, Nagoya, Aichi Highway No. 1 Mitsubishi Heavy Industries, Ltd., Nagoya Laboratory (56) References JP-A-60-108648 (JP, A)
Claims (1)
器出口の冷媒過熱度を検出する過熱度検出手段と、上記
蒸発器出口の過熱度を制御する電子式膨張弁と、上記圧
縮機から吐出されたホットガスをバイパスさせて上記蒸
発器に導くホットガスバイパス回路と、このホットガス
バイパス回路を通るホットガスの量を制御するホットガ
ス制御弁と、上記蒸発器によって冷却される被冷却対象
の温度を検知する温度検知器とを具備する冷凍装置にお
いて、 上記ホットガス制御弁の開度を被冷却対象温度と設定温
度との差に応じて決定するMV開度決定手段と、このMV開
度決定手段で決定されたホットガス制御弁の開度が設定
手段により設定された全閉と全閉に近い特定開度との範
囲内にあるか否かを判定するMV開度範囲比較手段と、範
囲内にないと判定されたとき上記電子式膨張弁の過熱度
制御目標値を変更するSH目標値設定手段と、変更された
過熱度制御目標値に基づいて上記電子式膨張弁の開度を
決定するEEV開度決定手段を有する制御装置を設けたこ
とを特徴とする冷凍装置。1. A compressor, a condenser, an evaporator, superheat detection means for detecting the degree of refrigerant superheat at the outlet of the evaporator, and an electronic expansion valve for controlling the degree of superheat at the outlet of the evaporator. A hot gas bypass circuit that bypasses the hot gas discharged from the compressor and guides it to the evaporator, a hot gas control valve that controls the amount of hot gas that passes through this hot gas bypass circuit, and is cooled by the evaporator. In a refrigerating apparatus having a temperature detector that detects the temperature of a cooling target, an MV opening determination means that determines the opening of the hot gas control valve according to the difference between the cooling target temperature and the set temperature. The MV opening degree for determining whether or not the opening degree of the hot gas control valve determined by the MV opening degree determining means is within the range between the fully closed state set by the setting means and the specific opening degree close to the fully closed state Range comparison means, if not within range SH target value setting means for changing the superheat control target value of the electronic expansion valve when judged, and EEV opening degree for determining the opening degree of the electronic expansion valve based on the changed superheat control target value A refrigeration system provided with a control device having a determination means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62139939A JPH07113492B2 (en) | 1987-06-05 | 1987-06-05 | Refrigeration equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62139939A JPH07113492B2 (en) | 1987-06-05 | 1987-06-05 | Refrigeration equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63306359A JPS63306359A (en) | 1988-12-14 |
| JPH07113492B2 true JPH07113492B2 (en) | 1995-12-06 |
Family
ID=15257193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62139939A Expired - Lifetime JPH07113492B2 (en) | 1987-06-05 | 1987-06-05 | Refrigeration equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07113492B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4690801B2 (en) * | 2005-07-08 | 2011-06-01 | 三菱重工業株式会社 | Refrigeration equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60108648A (en) * | 1983-11-16 | 1985-06-14 | ダイキン工業株式会社 | Refrigerator |
-
1987
- 1987-06-05 JP JP62139939A patent/JPH07113492B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63306359A (en) | 1988-12-14 |
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