JPS62223571A - Method of controlling refrigeration cycle - Google Patents
Method of controlling refrigeration cycleInfo
- Publication number
- JPS62223571A JPS62223571A JP6422886A JP6422886A JPS62223571A JP S62223571 A JPS62223571 A JP S62223571A JP 6422886 A JP6422886 A JP 6422886A JP 6422886 A JP6422886 A JP 6422886A JP S62223571 A JPS62223571 A JP S62223571A
- Authority
- JP
- Japan
- Prior art keywords
- valve opening
- opening
- refrigeration cycle
- valve
- expansion valve
- 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
- 238000005057 refrigeration Methods 0.000 title claims description 29
- 238000000034 method Methods 0.000 title claims description 15
- 239000003507 refrigerant Substances 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000010795 gaseous waste Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Landscapes
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は１ｇ子力発電所用気体廃棄物処理系の冷凍サイ
クルに係り、特に、冷凍サイクル内番二組込まれた電動
式膨張弁を負荷に対応した開度１二制御するための冷凍
サイクルの制御方法に関するものである。[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a refrigeration cycle for a gaseous waste treatment system for a 1g nuclear power plant, and particularly relates to an electric type refrigeration cycle built into the refrigeration cycle. The present invention relates to a refrigeration cycle control method for controlling the opening degree of an expansion valve in accordance with the load.
（従来の技術）
通常、冷凍サイクルは、圧縮機、凝縮器、膨張弁、蒸発
器が順次接続された閉サイクルで構成されており、この
冷凍サイクルにおいて負荷変動が生じた場合は、温度式
自動膨張弁により負荷変動に応じて、自動的に膨張弁が
作動し、冷凍サイクルを安定させている。ところが、負
荷変動がさらに大きくなると前記膨張弁だけでは容量制
御が不可能となるので、圧縮機出口からの高温高圧ガス
を直接蒸発器の冷媒入口管に接続するいわゆるホットガ
スバイパス方式が用いられている。このホットガスのバ
イパス量を制御する弁が容量制御井である。しかしなが
ら、このホットガスバイパス方式における問題点は温度
式自動膨張弁と容量制御弁のバイパスｍ調整による蒸発
圧力の設定が非常にむずかしく、全負荷に対して安定冷
凍サイクルを得ることが出来ないということである。し
かも時には調整不良となり、ハンチング現象やホットガ
スと液冷媒が交互に流れるレーシング現象まで発生する
こともある。このような状態になると。(Prior art) Normally, a refrigeration cycle consists of a closed cycle in which a compressor, a condenser, an expansion valve, and an evaporator are connected in sequence, and when load fluctuations occur in this refrigeration cycle, temperature control automatic The expansion valve automatically operates in response to load fluctuations, stabilizing the refrigeration cycle. However, when load fluctuations become larger, it becomes impossible to control the capacity using only the expansion valve, so a so-called hot gas bypass method is used in which the high-temperature, high-pressure gas from the compressor outlet is directly connected to the refrigerant inlet pipe of the evaporator. There is. The valve that controls the bypass amount of hot gas is the capacity control well. However, the problem with this hot gas bypass method is that it is very difficult to set the evaporation pressure by adjusting the temperature-type automatic expansion valve and the bypass m of the capacity control valve, and it is impossible to obtain a stable refrigeration cycle under all loads. It is. Moreover, sometimes the adjustment may be incorrect, resulting in hunting phenomena or racing phenomena in which hot gas and liquid refrigerant flow alternately. When you get into a situation like this.
所定の冷凍能力が得られず冷却不良となる。The specified refrigerating capacity cannot be obtained, resulting in poor cooling.
そこで、従来の温度式自動膨張弁とは異なった膨張弁例
えば特開昭６０−１５２８６３号に開示された熱電気式
膨張弁を用いて、蒸発器出口の冷媒温度を負荷変動に対
して常に一定に維持するようなＰＩＤ動作を組込んだ冷
凍装置が提案されている。このような冷凍装置を用いれ
ば従来の温度式自動膨張弁では制御不可能であった負荷
追従が可能となる。Therefore, an expansion valve different from the conventional thermostatic automatic expansion valve, such as a thermoelectric expansion valve disclosed in Japanese Patent Application Laid-Open No. 60-152863, is used to keep the refrigerant temperature at the evaporator outlet constant against load fluctuations. A refrigeration system incorporating PID operation has been proposed to maintain the temperature. If such a refrigeration system is used, it becomes possible to follow the load, which was impossible to control with conventional thermostatic automatic expansion valves.
ところが、かかる冷凍装置においても１次のような欠点
があることが分った。それは負荷変動に対応するＰＩＤ
の設定値を求めるためのゲインサーベイに多大な時間が
かかることであり、さらに蒸発器の熱容量が大きくなる
と、系統の時間遅れが大きくなりＰＩＤ制御の限界ぎり
ぎりでゲインセラ１−せざるをえないため、負荷追従性
が悪くなるという欠点があった。However, it has been found that such a refrigeration system also has the following drawbacks. It is a PID that responds to load fluctuations.
It takes a lot of time to conduct a gain survey to find the set value of However, there was a drawback that load followability deteriorated.
（発明が解決しようとする問題点）
本発明は上記事情に鑑みてなされたもので、その目的は
従来の温度式自動膨張弁及び熱電気式膨張弁をＰＩＤ動
作で制御しても、不可能であった大巾な負荷変動制御を
可能にするとともにＰＩＤのゲインサーベイに多大な時
間を費やすこともなく、シかも冷凍サイクルの調整を可
能とした冷凍サイクルの制御方法を提供することにある
。(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned circumstances, and its purpose is to control the conventional temperature-type automatic expansion valve and thermoelectric expansion valve by PID operation. To provide a method for controlling a refrigeration cycle, which enables wide-ranging load fluctuation control, and allows for easy adjustment of the refrigeration cycle without spending a great deal of time on PID gain surveys.
（問題点を解決するための手段） 本発明は上記目的を達成するために、圧縮機。 (Means for solving problems) In order to achieve the above object, the present invention provides a compressor.
凝縮器、電動式膨張弁、蒸発器を順次連結した冷凍サイ
クルの制御方法において、負荷上昇時には前記電動式膨
張弁の現在の弁開度がら１００％弁開度にし、次に前記
現在の弁開度と前記１００％弁開度の中間開度にし、こ
の中間開度を現在の弁開度として以下これを順次繰り返
えして適正な弁開度とし、負荷下降時にはまず前記電動
式膨張弁の現在の弁開度より０％弁開度にし、次に前記
現在の弁開度と０％弁開度の中間開度にし、この中間開
度を現在の弁開度として以下これを順次繰り返えして適
正な弁開度にｍ整するようにしたもである。In a method of controlling a refrigeration cycle in which a condenser, an electric expansion valve, and an evaporator are sequentially connected, when the load increases, the current valve opening of the electric expansion valve is changed to 100%, and then the current valve opening is changed to 100%. The valve opening is set to an intermediate opening between the 100% valve opening and the 100% valve opening, and this intermediate opening is set as the current valve opening.The steps are repeated sequentially to obtain the appropriate valve opening.When the load decreases, first the electric expansion valve Set the valve opening to 0% from the current valve opening, then set the valve opening to an intermediate opening between the current valve opening and 0% valve opening, and use this intermediate opening as the current valve opening and repeat this sequentially. In return, the valve opening is adjusted to an appropriate degree.
（作用）
したがって、本発明の冷凍サイクルの制御方法によれば
、電動式膨張弁の弁開度を自動高にセットすることがで
きるので、所定の負荷に適応した弁開度へ速やかに設定
することができる。(Function) Therefore, according to the refrigeration cycle control method of the present invention, the valve opening degree of the electric expansion valve can be automatically set to high, so the valve opening degree can be quickly set to a value suitable for a predetermined load. be able to.
（実施例） 以下、本発明の一実施例を図面を参照して説明する。(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
第１図は、本発明の一実施例の冷凍サイクルの系統図を
示すもので、圧縮機１．凝縮器２．電動式膨張弁３．蒸
発器４が順次接続されて冷凍サイクルを構成している。FIG. 1 shows a system diagram of a refrigeration cycle according to an embodiment of the present invention. Condenser 2. Electric expansion valve 3. Evaporators 4 are connected in sequence to form a refrigeration cycle.
蒸発器４の冷媒配管の入口と出口にはそれぞれ温度セン
サ６．７が設けられ。Temperature sensors 6.7 are provided at the inlet and outlet of the refrigerant piping of the evaporator 4, respectively.
これら温度センサ６．７にて検出された温度データは制
御表［８に入力され、この制御表［８により電動式膨張
弁３の開度をｉ？ｌ！ｌ整するように構成されている。The temperature data detected by these temperature sensors 6.7 is input to the control table [8, and the opening degree of the electric expansion valve 3 is determined by i? l! 1.
次に１本実施例の作用について説明する。Next, the operation of this embodiment will be explained.
第１図の冷凍サイクルにおいて負荷が一定の場合は、温
度センサ６．７の差（スーパーヒート）は膨張弁３の弁
開度により変化する。すなわち、第２図に示すように弁
開度が小さければスーパーヒートが大きくなり、弁開度
が大きくなるにつれてスーパーヒートが低くなる。When the load is constant in the refrigeration cycle shown in FIG. That is, as shown in FIG. 2, the smaller the valve opening, the greater the superheat, and the larger the valve opening, the lower the superheat.
通常冷凍サイクルを安定させるためにはスーパーヒート
を０〜１０℃の間に制御するようにしている。Normally, in order to stabilize the refrigeration cycle, superheat is controlled between 0 and 10°C.
この制御方法を第３図により説明する。第３図において
、上方のグラフィは時間に対する冷媒のスーパーヒート
の変化を示し、下方のゲラフロは、第１図に示した制御
装置８により電動式膨張弁の開度を上記スーパーヒート
の変化に応じて調整するグラフを示している。This control method will be explained with reference to FIG. In FIG. 3, the upper graph shows the change in the superheat of the refrigerant over time, and the lower graph shows the opening degree of the electric expansion valve by the control device 8 shown in FIG. 1 according to the change in the superheat. This shows the graph to be adjusted.
今例えばスーパーヒートの上限値ａを１０℃、下限値す
を０℃とする。運転初期において第１図に示した制御装
Ｗ１８にて、例えば膨張弁がＡの開度に設定されていた
とする。このＡの開度に対して冷凍サイクルの負荷が著
しく大きい場合、スーパーヒートが急激に上昇し、上限
値ａを薦えたことが制御装置８内にて演算され、電動式
膨張弁３の弁開度を１００％の状態にする。また、この
場合制御装Ｗ、８は全開前の開度Ａを記憶する。膨張弁
３が全開になると、スーパーヒー１〜は、やがて低下し
、下限値す以下に下がったことを制御装！！１８内で演
算され記憶していたＡの開度と弁開度１００％の中間開
度に膨張弁３の開度Ｂを調整する。また、この場合制御
装置は開度Ｂを記憶する。しかして開度Ｂでもスーパー
ヒートが上限値を越える場合は、再度電動式膨張弁３の
弁開度を１００％の状態にする。膨張弁３が全開となる
と、スーパーヒートは、やがて低下し、下限値湯上に下
がったことを制御装［８内で演算され、記憶していたＢ
の開度と弁開度１００％の中間開度に膨張弁３の開度を
調整する。このようにして、スーパーヒートが所定値に
調整出来る。For example, assume that the upper limit value a of superheat is 10°C and the lower limit value a is 0°C. Assume that, for example, the expansion valve is set to the opening degree A in the control device W18 shown in FIG. 1 at the beginning of operation. If the load on the refrigeration cycle is significantly large relative to the opening degree of A, the superheat will rise rapidly, and the controller 8 will calculate that the upper limit value a has been recommended, and the electric expansion valve 3 will be opened. Set the degree to 100%. Further, in this case, the control device W, 8 stores the opening degree A before full opening. When the expansion valve 3 is fully opened, the superheat 1~ eventually decreases, and the control device indicates that it has fallen below the lower limit value! ! The opening degree B of the expansion valve 3 is adjusted to an intermediate opening degree between the opening degree A calculated and stored in step 18 and the valve opening degree 100%. Further, in this case, the control device stores the opening degree B. However, if the superheat exceeds the upper limit even at the opening degree B, the valve opening degree of the electric expansion valve 3 is set to 100% again. When the expansion valve 3 is fully opened, the superheat gradually decreases, and the control unit 8 calculates and stores that the temperature has fallen above the lower limit value.
The opening of the expansion valve 3 is adjusted to an intermediate opening of 100% and 100%. In this way, the super heat can be adjusted to a predetermined value.
このように弁全開前の開度を記憶し、その記憶した開度
と全開の中間開度に弁を制御することによりすみやかに
スーパーヒートを所定値内に調整することが出来る。In this way, by storing the opening degree before the valve is fully opened and controlling the valve to an intermediate opening degree between the stored opening degree and the fully open position, the superheat can be quickly adjusted to within a predetermined value.
また、負荷が低下した場合は現状全開度とＯ％開度の中
間開度にセットし、上記方法を順次繰り返えせばよい。Furthermore, if the load decreases, the opening may be set to an intermediate opening between the current full opening and 0% opening, and the above method may be repeated in sequence.
なお、上記電動式膨張弁３は制御装？！８の電気信号に
よりその開度が調整されるものであればよく１例えばパ
ルス式膨張弁を用いてもよい。By the way, is the electric expansion valve 3 mentioned above a control device? ! For example, a pulse type expansion valve may be used as long as its opening degree can be adjusted by the electrical signal 8.
したがって１本実施例によれば、従来のＰＩＤのゲイン
サーベイがなくなり、自動調整運転が可能となり、また
負荷追従性が従来のＰＩＤ制御方式よりも早くなり、収
束性がよくなる。Therefore, according to this embodiment, the conventional PID gain survey is eliminated, automatic adjustment operation becomes possible, load followability becomes faster than the conventional PID control system, and convergence is improved.
以上説明したように１本発明によれば負荷変動の大きな
冷凍サイクルにおいて、従来では得られなかった負荷追
従制御が可能であり、しがも、自動調整なのでＰＩＤの
ゲインサーベイも不要となる。さらに冷凍サイクルの予
備調整も不要となるので、現地据付のみでよいというよ
うにすぐれた効果を奏する。As explained above, according to the present invention, in a refrigeration cycle with large load fluctuations, load follow-up control that could not be achieved in the past is possible, and since the adjustment is automatic, there is no need for a PID gain survey. Furthermore, since preliminary adjustment of the refrigeration cycle is not required, the system has an excellent effect in that it only needs to be installed on-site.
第１図は本発明の一実施例の冷凍サイクルの制御方法の
系統図、第２図は第１図の冷凍サイクルにおいである負
荷に対しての電動式膨張弁の弁開度トス−バーヒートの
関係を示すグラフ、第３図は本発明に係る冷凍サイクル
の制御方法を説明するグラフである。
１・・・圧縮機 ２・・・凝縮鼎３・・・電動
式膨張弁 ４用蒸発器
５・・・容量制御弁 ６，７・・・温度センサ８・
・・制御装置
代理人 弁理士 猪股祥晃（はが１名）第１図
第２図
一一時肉
第３図FIG. 1 is a system diagram of a control method for a refrigeration cycle according to an embodiment of the present invention, and FIG. 2 is a diagram of the valve opening of the electric expansion valve for a certain load in the refrigeration cycle of FIG. A graph showing the relationship, FIG. 3 is a graph explaining the refrigeration cycle control method according to the present invention. 1... Compressor 2... Condensation valve 3... Electric expansion valve 4 Evaporator 5... Capacity control valve 6, 7... Temperature sensor 8.
... Control device agent Patent attorney Yoshiaki Inomata (one person) Figure 1 Figure 2 - Figure 3
Claims (2)
結した冷凍サイクルの制御方法において、負荷上昇時に
は前記電動式膨張弁の現在の弁開度から１００％弁開度
にし、次に前記現在の弁開度と前記１００％弁開度の中
間開度にし、この中間開度を現在の弁開度として以下こ
れを順次繰り返えして適正な弁開度とし、負荷下降時に
はまず前記電動式膨張弁の現在の弁開度より０％弁開度
にし、次に前記現在の弁開度と０％弁開度の中間開度に
し、この中間開度を現在の弁開度として以下これを順次
繰り返えして適正な弁開度に調整するようにしたことを
特徴とする冷凍サイクルの制御方法。(1) In a method of controlling a refrigeration cycle in which a compressor, a condenser, an electric expansion valve, and an evaporator are connected in sequence, when the load increases, the current valve opening of the electric expansion valve is changed to 100%, and then Then, set the valve opening to an intermediate opening between the current valve opening and the 100% valve opening, use this intermediate opening as the current valve opening, and repeat this process sequentially to obtain the appropriate valve opening.When the load decreases, First, set the valve opening to 0% from the current valve opening of the electric expansion valve, then set the valve opening to an intermediate opening between the current valve opening and 0% valve opening, and make this intermediate opening the current valve opening. A method for controlling a refrigeration cycle, characterized in that the following steps are repeated one after another to adjust the valve opening to an appropriate degree.
限値と下限値を設定することにより発信するようにして
いる特許請求の範囲第１項記載の冷凍サイクルの制御方
法。(2) A method for controlling a refrigeration cycle according to claim 1, wherein the valve opening degree signal is transmitted by setting an upper limit value and a lower limit value of superheat of the evaporator refrigerant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6422886A JPS62223571A (en) | 1986-03-24 | 1986-03-24 | Method of controlling refrigeration cycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6422886A JPS62223571A (en) | 1986-03-24 | 1986-03-24 | Method of controlling refrigeration cycle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62223571A true JPS62223571A (en) | 1987-10-01 |
Family
ID=13252042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6422886A Pending JPS62223571A (en) | 1986-03-24 | 1986-03-24 | Method of controlling refrigeration cycle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62223571A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102203525A (en) * | 2008-09-05 | 2011-09-28 | 丹福斯有限公司 | A method for controlling a flow of refrigerant to an evaporator |
-
1986
- 1986-03-24 JP JP6422886A patent/JPS62223571A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102203525A (en) * | 2008-09-05 | 2011-09-28 | 丹福斯有限公司 | A method for controlling a flow of refrigerant to an evaporator |
| JP2012502245A (en) * | 2008-09-05 | 2012-01-26 | ダンフォス アクチ−セルスカブ | Method for controlling the flow of refrigerant to the evaporator |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR890004396B1 (en) | Opersting method and control system for refrigeration system | |
| US5533347A (en) | Method of refrigeration case control | |
| US5000009A (en) | Method for controlling an electronic expansion valve in refrigeration system | |
| US4265299A (en) | Heat pump control system | |
| US4124177A (en) | Heating system | |
| JP2634139B2 (en) | Refrigeration apparatus and control method thereof | |
| US4356961A (en) | Dual deadband control system | |
| JP2006266533A (en) | Valve control system and valve control method | |
| JPS62223571A (en) | Method of controlling refrigeration cycle | |
| DK150251B (en) | CONTROL DEVICE FOR KAELE PLANTS | |
| JPS63156978A (en) | Refrigerating air conditioner | |
| JPH0799287B2 (en) | Air conditioner | |
| JPH031055A (en) | Cooling and heating apparatus | |
| JPH0275858A (en) | Refrigerating air conditioner | |
| JPS611963A (en) | Method of controlling refrigerant for heat pump type air conditioner | |
| JP2755037B2 (en) | Refrigeration equipment | |
| JPS6189455A (en) | Flow controller for refrigerant in refrigeration cycle | |
| JPS63129286A (en) | Refrigerator | |
| JPH03225161A (en) | Liquid injection device of freezing cycle in thermostatic device | |
| JPS611942A (en) | Capacity control system of air conditioner | |
| JPS62129660A (en) | Method of controlling refrigerant in refrigerator | |
| JPH04244557A (en) | Expansion valve controlling method for air conditioner | |
| JPS6014072A (en) | Method of controlling temperature | |
| JPH01305265A (en) | Refrigerating air conditioner | |
| JPS58130925A (en) | Controller for temperature of air conditioner |