JPS60111842A - Refrigerator - Google Patents
RefrigeratorInfo
- Publication number
- JPS60111842A JPS60111842A JP21821783A JP21821783A JPS60111842A JP S60111842 A JPS60111842 A JP S60111842A JP 21821783 A JP21821783 A JP 21821783A JP 21821783 A JP21821783 A JP 21821783A JP S60111842 A JPS60111842 A JP S60111842A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- pressure
- frequency converter
- compressor
- output
- 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
- 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】
〔発明の技術分野〕
この発明は冷凍装置に関し、特に周波数変換器を用いて
圧m機の回転数を制御する冷凍装置の改良に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a refrigeration system, and more particularly to an improvement in a refrigeration system that uses a frequency converter to control the rotational speed of a compressor.
周波数変換器な用いて圧縮機の回転数を制御する冷凍装
置は、圧縮機の回転数を連続的に可変することができる
ことから、冷凍能力可変の点から近年急速に注目される
傾向にある。Refrigeration systems that use a frequency converter to control the rotation speed of a compressor are rapidly attracting attention in recent years from the standpoint of variable refrigerating capacity because the rotation speed of the compressor can be varied continuously.
第1図は周波数可変方式によって駆動される冷凍装置の
一例な示す構成図であって、lは冷媒を圧縮して出力す
る圧縮機、2は凝縮器、3は膨張弁、4は蒸発器であり
℃、これらは閉ループ接続されることによって冷凍サイ
クルを構成している。FIG. 1 is a block diagram showing an example of a refrigeration system driven by a variable frequency system, where l is a compressor that compresses and outputs refrigerant, 2 is a condenser, 3 is an expansion valve, and 4 is an evaporator. ℃, these constitute a refrigeration cycle by being connected in a closed loop.
5は圧m機1に設けられている電動機に供給する交流電
源の周波数を可変する周波数変換器、6は冷凍サイクル
に於ける低圧圧力を検出する圧力検出器7の出力に応じ
て周波数変換器5を制御する制御器である。5 is a frequency converter that varies the frequency of the AC power supply supplied to the electric motor provided in the pressure generator 1; 6 is a frequency converter that changes the frequency of the AC power supply to detect the low pressure in the refrigeration cycle according to the output of the pressure detector 7; This is a controller that controls 5.
この様に構成された冷凍装置に於いて、負荷が大きい場
合には冷凍サイクルに於ける低圧側の圧力が高くなり、
これに伴なって圧力検出器7の出力も上昇する。制御器
6は一定時間、例えば20秒毎に設定圧力と圧力検出器
7の出力とを比較し、圧力検出器7の出力が設定圧力よ
りも高い場合には周波数変換器5を制御して圧縮機lの
電動機に供給する電源周波数を高める。このようにして
、電源周波数が高められると、圧縮機lの回転数が上昇
して冷却能力が向上する。ここで、冷凍サイクルに於げ
る低圧側の圧力が第2区に示す設定値IN以下になると
、制御器6は周波数変換器5の出力周波数が第3図に示
す様に固定化される。また、低圧側の圧力が第2図に示
す設定値OUT以下になると、制御器6は一定時間とし
ての例えば20秒毎に設定値INと比較して周波数変換
器5の出力周波数を下げることによって圧縮機10回転
数が第3図に示す様に下げられる。そして、周波数変換
器5の出力周波数が実用下限周波数に達すると周波数が
急激に低下して周波数零となることにより圧縮機10回
転が停止する。In a refrigeration system configured in this way, when the load is large, the pressure on the low pressure side of the refrigeration cycle increases,
Along with this, the output of the pressure detector 7 also increases. The controller 6 compares the set pressure and the output of the pressure detector 7 at fixed intervals, for example, every 20 seconds, and controls the frequency converter 5 to compress when the output of the pressure detector 7 is higher than the set pressure. Increase the power frequency supplied to the machine's motor. In this way, when the power frequency is increased, the rotational speed of the compressor 1 is increased and the cooling capacity is improved. Here, when the pressure on the low pressure side in the refrigeration cycle becomes less than the set value IN shown in the second section, the controller 6 fixes the output frequency of the frequency converter 5 as shown in FIG. Furthermore, when the pressure on the low pressure side becomes less than the set value OUT shown in FIG. The compressor 10 rotation speed is lowered as shown in FIG. When the output frequency of the frequency converter 5 reaches the practical lower limit frequency, the frequency rapidly decreases to zero, and the compressor 10 rotations are stopped.
次に、冷凍サイクルに於ける低圧側の圧力が設定値IN
を越えて上昇すると、制御器6は周波数変換器5を制御
することによって、実用下限周波数から徐々に周波数が
上昇する出力を発生させて圧縮機1の運転を開始させる
。Next, the pressure on the low pressure side of the refrigeration cycle reaches the set value IN.
When the frequency exceeds the practical lower limit frequency, the controller 6 controls the frequency converter 5 to generate an output whose frequency gradually increases from the practical lower limit frequency, and starts operating the compressor 1.
しかしなから、上記構成による冷凍装置に於いては、実
用下限まで周波数が下がり、さらに出力側の圧力が設定
値OUT以下になると圧縮機lが停止するが、例えば3
0KHzでは全体能力の50−となり、被冷却物がまだ
冷えていないのに停止する場合か生じ、これに伴なって
冷却がちまくなったり、逆に停止後の再運転が30Hz
から始まることから、除霜後等に於ける高負荷時には1
00饅周波数になるまで時間がかかつてプルダウンが長
くなって冷えるのに長時間が必要になる問題を有してい
る。However, in the refrigeration system with the above configuration, when the frequency drops to the practical lower limit and the pressure on the output side becomes less than the set value OUT, the compressor l will stop.
At 0KHz, the overall capacity is 50-50%, which may cause the cooling to stop even though the object to be cooled has not cooled down yet, resulting in slow cooling, or conversely, restarting after stopping at 30Hz.
1 during high loads such as after defrosting.
There is a problem that it takes a long time to reach the 00 frequency, and the pulldown becomes long, so it takes a long time to cool down.
〔発明の概要」
従って、この発明による目的は、上記問題を解決するた
めになされたものであって1周波数が下限まで低下した
時にはその周波数で固定し、再始動時には100%周波
数から運転を開始させることによって、冷却特性を改善
した冷凍装置を提供するものである。[Summary of the invention] Therefore, the object of this invention was to solve the above problem, and when one frequency drops to the lower limit, it is fixed at that frequency, and when restarting, operation starts from 100% frequency. This provides a refrigeration system with improved cooling characteristics.
第4図はこの発明による冷凍装置の一実施例を示¥構成
図であって、第1図と同一部分は同一符号を用いて示し
である。同図に於いて8は圧力検出器7の出力に対応し
て周波数変換器5を制御する制御器であって、圧力検出
器7の出力信号が下限設定値を越えて低下した場合には
実用下限周波数の出力を発生する様に周波数変換器5を
制御し、始動開始時には100%周波数の出力を発生し
て圧縮機1を駆動する様に周波数変換器5を制御するよ
うに構成されていて、他は第1図の場合と同様な構成で
ある。FIG. 4 is a block diagram showing an embodiment of the refrigeration system according to the present invention, and the same parts as in FIG. 1 are designated by the same reference numerals. In the same figure, 8 is a controller that controls the frequency converter 5 in response to the output of the pressure detector 7, and is used when the output signal of the pressure detector 7 decreases beyond the lower limit set value. The frequency converter 5 is controlled so as to generate an output at the lower limit frequency, and the frequency converter 5 is controlled so as to generate an output at 100% frequency to drive the compressor 1 at the start of startup. , otherwise the configuration is the same as in the case of FIG.
この様に構成された冷凍装置に於いて、負荷が大きな場
合には冷凍サイクルに於ける低圧側の圧力か高くなる。In a refrigeration system configured in this manner, when the load is large, the pressure on the low pressure side of the refrigeration cycle increases.
そして、この低圧側の冷媒圧力は、圧力検出器7に於い
て検出された後に、その出力信号が制御器8に供給され
る。制御器8は圧力検出器7の出力信号を一定時間毎(
例えば20秒毎)に設定圧力INと比較し、第5図に示
す低圧側の冷媒圧力が設定値INよりも高いと判断され
ると。After the refrigerant pressure on the low pressure side is detected by the pressure detector 7, its output signal is supplied to the controller 8. The controller 8 outputs the output signal of the pressure detector 7 at regular intervals (
For example, every 20 seconds), the refrigerant pressure on the low pressure side shown in FIG. 5 is determined to be higher than the set value IN.
この制御器8は周波数変換器5を制御して出力周波数を
高めることにより圧縮機lの回転数を上げて冷却能力を
高める。次に低圧側の冷媒圧力が第5図に示す様に設定
値IN以下になると、制御器8は周波数変換器5の出力
周波数を第6図に示す様にそのままに固定制御する。次
に、低圧側の冷媒圧力が東に低下して設定値OUT以下
になったことを制御器8が検出すると、一定時間毎(例
えば20秒)に設定値OUTと比較して周波数変換器5
の出力周波数なその圧力に対応して第6図に示す様に下
げる制御を実行することによって圧縮機10回転数を下
げる。ここで、周波数変換器5の出力周波数が実用下限
周波数に達すると、制御器8と周波数変換器5は出力周
波数を第6図に示す様に下限値に固定した状態で運転な
続行する。This controller 8 controls the frequency converter 5 to increase the output frequency, thereby increasing the rotational speed of the compressor 1 and increasing the cooling capacity. Next, when the refrigerant pressure on the low pressure side becomes equal to or less than the set value IN as shown in FIG. 5, the controller 8 controls the output frequency of the frequency converter 5 to remain unchanged as shown in FIG. Next, when the controller 8 detects that the refrigerant pressure on the low pressure side has decreased to the east and has become below the set value OUT, the frequency converter 5
The rotation speed of the compressor 10 is lowered by executing control to lower the output frequency of the compressor as shown in FIG. 6 in accordance with the pressure. Here, when the output frequency of the frequency converter 5 reaches the practical lower limit frequency, the controller 8 and the frequency converter 5 continue to operate with the output frequency fixed at the lower limit value as shown in FIG.
そして、この実用下限周波数による運転が予め定められ
た設定時間以上にわたって続いても低圧側の冷媒圧力か
設定値INを越えない場合には、第6図に示す様に周波
数変換器5の出力周波数をゼロとして圧縮機を停止させ
る。If the refrigerant pressure on the low pressure side does not exceed the set value IN even if the operation at this practical lower limit frequency continues for more than a predetermined set time, the output frequency of the frequency converter 5 will change as shown in FIG. is set to zero and the compressor is stopped.
次に、圧縮機の停止に伴なって低圧側の冷媒圧力が第5
図に示づ一様に急上昇して設定値INを越えると、制御
器6は周波数変換器5から第6図に示す様に100%周
波数の出力を発生させて圧縮機lを100%回転により
駆動させる。そして、低圧1i111の冷媒圧力が設定
値INを越えて低下すると、上述した場合と同様の制御
をくり返す。Next, as the compressor stops, the refrigerant pressure on the low pressure side decreases to the fifth level.
As shown in the figure, when the value rapidly increases and exceeds the set value IN, the controller 6 generates an output of 100% frequency from the frequency converter 5 as shown in FIG. drive. Then, when the refrigerant pressure of the low pressure 1i111 decreases beyond the set value IN, the same control as in the above case is repeated.
以上説明した4*に、この発明による冷凍装置に於いて
は、低負荷時には実用限界周波数に固定して圧縮機の運
転を続行させるために、すべての被冷却物が冷却される
まで運転を続けることが出来る。また、停止後の再始動
時には100%周波数で駆動されるために、除霜後の高
負荷時等に於いてもすみやかにプルダウンを行なうこと
か出来るために、品物の鮮度をより良く保つことが出来
るAs explained above in 4*, in the refrigeration system according to the present invention, in order to continue operating the compressor by fixing it at the practical limit frequency when the load is low, the operation continues until all the objects to be cooled are cooled. I can do it. In addition, since it is driven at 100% frequency when restarting after a stop, it can be pulled down quickly even under high loads after defrosting, which helps keep products fresher. I can do it
第1図は従来の冷凍装置に於ける構成図とその制御系の
(ロ)略図、第2図、第3図は低圧側の冷媒圧力と周波
数の関係を示す特性図、第4図はこの発明による冷凍装
置の一実施例を示す構成図、第5図、第6図は低圧側の
冷媒圧力と周波数の関係を示す特性図である。
l・・・圧縮機、2・・・凝縮機、3・・・膨張弁、4
・・・蒸発器、5・・・周波数変換器、7・・・圧力検
出器、8・・・制御器。
なお、図中同一または相当部分は同一符号を用いて示し
である。
代理人 大岩 増雄(外2名)
第1図
乙
第2図
第4図Figure 1 is a schematic diagram of the configuration of a conventional refrigeration system and its control system, Figures 2 and 3 are characteristic diagrams showing the relationship between refrigerant pressure and frequency on the low pressure side, and Figure 4 is a diagram of this control system. 5 and 6 are characteristic diagrams showing the relationship between refrigerant pressure on the low pressure side and frequency. FIG. l... Compressor, 2... Condenser, 3... Expansion valve, 4
... Evaporator, 5... Frequency converter, 7... Pressure detector, 8... Controller. Note that the same or equivalent parts in the figures are indicated using the same reference numerals. Agent Masuo Oiwa (2 others) Figure 1 Figure 2 Figure 4
Claims (1)
プに接続された冷凍サイクルと、前記圧縮機を駆動する
電動機に供給する電源周波数を可変する周波数変換器と
、前記冷凍サイクルの低圧側に於ける冷媒圧力を検出す
る圧力検出器と、この圧力検出器の出力を入力として前
記周波数変換器を制御する制御器とを有し、この制御器
は前記冷媒圧力が設定値以下になるとその圧力に対応し
た減速制御を実行し、減速時に周波数変換器の出力周波
数が予め定められた程波数まで低下すると実用下限周波
数に固定したままの運転制御を実行させ、再運転時には
周波数変換器から100%周波数の! 出力を発生して圧縮機の電動機に供給す名制御を実行す
ることを特徴とする冷凍装置。(1) A refrigeration cycle in which a compressor, a condenser, an expansion valve, and an evaporator are connected in a closed loop, a frequency converter that varies the power frequency supplied to the electric motor that drives the compressor, and a low-pressure side of the refrigeration cycle. It has a pressure detector that detects the refrigerant pressure at the refrigerant, and a controller that controls the frequency converter using the output of the pressure detector as input, and the controller controls the frequency converter when the refrigerant pressure becomes below a set value. Deceleration control corresponding to the pressure is executed, and when the output frequency of the frequency converter drops to a predetermined wave number during deceleration, operation control is executed with the frequency fixed at the practical lower limit frequency, and when restarting, the frequency converter outputs 100% % of frequency! A refrigeration system that performs control to generate output and supply it to an electric motor of a compressor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21821783A JPS60111842A (en) | 1983-11-18 | 1983-11-18 | Refrigerator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21821783A JPS60111842A (en) | 1983-11-18 | 1983-11-18 | Refrigerator |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS60111842A true JPS60111842A (en) | 1985-06-18 |
Family
ID=16716444
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21821783A Pending JPS60111842A (en) | 1983-11-18 | 1983-11-18 | Refrigerator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60111842A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6267157U (en) * | 1985-10-15 | 1987-04-25 | ||
JPS62116879A (en) * | 1985-11-13 | 1987-05-28 | 三洋電機株式会社 | Refrigerator |
JPS62116880A (en) * | 1985-11-13 | 1987-05-28 | 三洋電機株式会社 | Refrigerator |
JPS63223459A (en) * | 1987-03-10 | 1988-09-16 | セイコ−精機株式会社 | Capacity variable controller for gas compressor |
-
1983
- 1983-11-18 JP JP21821783A patent/JPS60111842A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6267157U (en) * | 1985-10-15 | 1987-04-25 | ||
JPH0541317Y2 (en) * | 1985-10-15 | 1993-10-19 | ||
JPS62116879A (en) * | 1985-11-13 | 1987-05-28 | 三洋電機株式会社 | Refrigerator |
JPS62116880A (en) * | 1985-11-13 | 1987-05-28 | 三洋電機株式会社 | Refrigerator |
JPS63223459A (en) * | 1987-03-10 | 1988-09-16 | セイコ−精機株式会社 | Capacity variable controller for gas compressor |
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