JP2564358B2 - Refrigeration cycle operation control device - Google Patents
Refrigeration cycle operation control deviceInfo
- Publication number
- JP2564358B2 JP2564358B2 JP63102585A JP10258588A JP2564358B2 JP 2564358 B2 JP2564358 B2 JP 2564358B2 JP 63102585 A JP63102585 A JP 63102585A JP 10258588 A JP10258588 A JP 10258588A JP 2564358 B2 JP2564358 B2 JP 2564358B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- value
- low
- low pressure
- high pressure
- 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
Landscapes
- Air Conditioning Control Device (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は冷房装置に係り、特に年間冷房装置の省エネ
ルギ運転に好適な制御方法に関する。The present invention relates to a cooling device, and more particularly to a control method suitable for energy saving operation of an annual cooling device.
従来の年間冷房装置では機械式の凝縮圧力調節弁を採
用しており、凝縮圧力は一定値に保たれていて、高低圧
の圧力差を確保している。従って、容量制御式の圧縮機
を使用した冷凍サイクルでも前記機械式圧力調節弁の働
きで圧縮機の容量制御を行なっても常に一定の高圧圧力
を維持することができるが低圧側の圧力は冷凍サイクル
のバランスによりできなりの状態となった。又、低圧側
の圧力制御を積極的に行なう場合は蒸発圧力制御弁を用
いることもあるが、蒸発圧力調節弁を使用すると蒸発器
圧力を高くするために弁を閉じ冷媒を蒸発器に溜めるよ
うに作用させているために、圧縮機への戻り冷媒の流量
が減少し低圧圧力が急激に低下すると共に高圧圧力を維
持するための凝縮圧力調節弁を作用によって圧縮機前後
の高低圧圧力差が必要以上に生じた運転状態となってい
た。The conventional annual cooling system employs a mechanical condensing pressure control valve, which keeps the condensing pressure at a constant value and secures a high-low pressure difference. Therefore, even in a refrigeration cycle using a capacity-controlled compressor, a constant high pressure can always be maintained even if the capacity of the compressor is controlled by the action of the mechanical pressure control valve, but the pressure on the low pressure side is frozen. Due to the balance of the cycle, it was in a poorly made state. Further, when positively controlling the pressure on the low pressure side, an evaporation pressure control valve may be used, but if an evaporation pressure control valve is used, the valve will be closed in order to increase the evaporator pressure and the refrigerant will be stored in the evaporator. Since the flow rate of the return refrigerant to the compressor is reduced and the low pressure is sharply decreased, the condensation pressure control valve for maintaining the high pressure causes the high and low pressure difference before and after the compressor. It was in an operating state that occurred more than necessary.
上記従来技術は冷媒循環量を確保するために高圧側の
機械式凝縮圧力調節弁を作用させて減圧装置の入口圧力
を高くしたが、低圧側の圧力については特に配慮されな
い場合が多く、容量制御式の圧縮機で小容量で使用した
場合は蒸発圧力は高めになるが大容量で使用した場合に
は低めになり、低温領域で運転する場合には蒸発器に着
霜したり圧縮機に悪影響を及ぼすほど低圧の圧力状態が
続く等の問題があった。又、蒸発器の着霜を防止するた
めに一定の蒸発圧力を確保する蒸発圧力調節弁を使う場
合は着霜防止の問題は生じないが、蒸発器から圧縮機へ
戻る冷媒流量の減少により圧縮機低圧圧力が異常に低下
し圧縮機電動機の過熱等の問題が生じることもあった。In the above-mentioned conventional technology, the mechanical pressure control valve on the high-pressure side is actuated to increase the inlet pressure of the pressure reducing device in order to secure the circulation amount of the refrigerant, but the pressure on the low-pressure side is often not particularly considered, and the capacity control is performed. When used with a small capacity compressor, the evaporating pressure is high, but when it is used with a large capacity, it is lower, and when operating in the low temperature range, frost is formed on the evaporator and the compressor is adversely affected. There was a problem that the low pressure continued for a long time. Also, when using an evaporation pressure control valve that secures a constant evaporation pressure to prevent frost formation on the evaporator, the problem of frost formation prevention does not occur, but the refrigerant flow rate from the evaporator to the compressor is reduced In some cases, the low pressure of the compressor was abnormally reduced, causing problems such as overheating of the compressor motor.
本発明の目的は高圧圧力を適正に保ちながら低圧圧力
を維持し蒸発器での着霜防止や圧縮機の運転状態を正常
にするように積極的に制御をすることにある。An object of the present invention is to positively control so as to maintain a low pressure while properly maintaining a high pressure to prevent frost formation in the evaporator and normalize the operating state of the compressor.
上記目的を達成するために、本発明は、圧縮機、凝縮
器、蒸発器、減圧装置と冷凍サイクルの高圧圧力を制御
するため凝縮圧力の設定値を可変する凝縮圧力調節弁を
有する冷凍サイクルの運転制御装置において、冷凍サイ
クルの高圧圧力及び低圧圧力を検出するセンサを備え、
低圧圧力の値が予め定めた基準の低圧圧力（P2）よりも
小さいときは、高圧圧力の値が予め定めた基準の高圧圧
力（P4）よりも上昇するように凝縮圧力調節弁の設定値
を大きくし、低圧圧力の値が予め定めた基準の低圧圧力
（P2）以上のときは、高圧圧力の値が予め定めた基準の
高圧圧力（P4）以下となるように凝縮圧力調節弁の設定
値を可変するものである。In order to achieve the above object, the present invention provides a compressor, a condenser, an evaporator, a decompression device, and a refrigeration cycle having a condensing pressure control valve for varying the set value of the condensing pressure for controlling the high pressure of the refrigeration cycle. In the operation control device, a sensor for detecting high pressure and low pressure of the refrigeration cycle is provided,
When the low pressure value is smaller than the predetermined standard low pressure (P 2 ), the condensation pressure control valve is set so that the high pressure value rises above the predetermined standard high pressure (P 4 ). Increase the value and adjust the condensing pressure so that when the low pressure value is higher than the predetermined reference low pressure (P 2 ), the high pressure value is equal to or lower than the predetermined high reference pressure (P 4 ). This is to change the set value of the valve.
冷凍サイクルを年間を通じて冷房運転する場合、特に
冬季において、高圧圧力を一定値以上高くしないと冷凍
サイクルが成立しなくなるため高圧圧力を一定値に維持
するようにしている。しかし、この場合、圧縮機を大容
量で使用したり、冬期の運転始動時には低圧圧力が低く
なってしまうことがある。また、蒸発器の着霜を防止す
るためには低圧圧力を一定値以上になるように確保する
必要がある。そのため、高圧圧力を一定値に維持したま
ま蒸発圧力調整弁などで低圧圧力を一定値以上になるよ
うに制御すると、低圧圧力を高くするために蒸発圧力調
節弁を閉じるように作用する。よって、圧縮機への戻り
冷媒の流量が減少し、低圧圧力が異常に低下し、圧縮機
の運転下限値を越えたり、過熱等の問題を生じる。When the refrigeration cycle is operated in a cooling mode throughout the year, especially in winter, the high pressure is maintained at a constant value because the refrigeration cycle cannot be established unless the high pressure is raised above a certain value. However, in this case, the compressor may be used with a large capacity, or the low pressure may become low at the start of operation in winter. Further, in order to prevent frost formation on the evaporator, it is necessary to secure the low pressure to a certain value or higher. Therefore, when the low pressure is controlled to be a certain value or higher with the evaporation pressure adjusting valve or the like while keeping the high pressure at a constant value, the evaporation pressure adjusting valve is closed to increase the low pressure. Therefore, the flow rate of the return refrigerant to the compressor is reduced, the low pressure is abnormally lowered, the operation lower limit value of the compressor is exceeded, and problems such as overheating occur.
そこで、低圧圧力の値が予め定めた基準の低圧圧力
（P2）よりも小さいときは、高圧圧力の値が予め定めた
基準の高圧圧力（P4）よりも上昇するように凝縮圧力調
節弁の設定値を大きくする。これにより、高圧圧力は、
適正値である基準の高圧圧力（P4）よりも若干越えて大
きくなるが、冷媒流量が増加し、低圧圧力を高めに維持
することができ、圧縮機の運転を正常にすることができ
る。Therefore, when the low pressure value is smaller than a predetermined reference low pressure (P 2 ), the condensation pressure control valve is adjusted so that the high pressure value rises above the predetermined reference high pressure (P 4 ). Increase the setting value of. As a result, the high pressure is
Although it slightly exceeds the reference high pressure (P 4 ) which is an appropriate value, the flow rate of the refrigerant increases and the low pressure can be maintained at a high level, so that the compressor can be operated normally.
また、低圧圧力の値が予め定めた基準の低圧圧力
（P2）以上のときは、高圧圧力の値が予め定めた基準の
高圧圧力（P4）以下となるように凝縮圧力調節弁の設定
値を制御することにより、無駄な動力の増加を防ぎ、圧
縮機の効率を向上できる。Also, when the low pressure value is above a predetermined reference low pressure (P 2 ), the condensation pressure control valve is set so that the high pressure value is below a predetermined reference high pressure (P 4 ). By controlling the value, it is possible to prevent unnecessary increase of power and improve the efficiency of the compressor.
以下、本発明の一実施例を第一図と、第二図により説
明する。第一図は運転圧力の変化で、それぞれ1,3は低
圧圧力Ps,Ps′2,4は高圧圧力Pd,P′d,5は基準圧力（低
圧）P2,6は運転前バランス圧力P1,7は制御後低圧圧力
P3,8は基準の高圧圧力P4,を示す。第一図において、運
転前の圧力はP1の値（運転前バランス圧力６）にあり運
転後は制御なしの場合低圧圧力Ps1,高圧圧力Pd1の実線
をたどって推移する。冬期等は、高圧圧力が上昇せず８
基準圧力P4に達するのに時間を要し低圧側の運転条件
（低温領域）では５基準圧力（低圧）P2を満足せず蒸発
器の着霜や高圧圧力差が大きいため圧縮機の異常を生じ
る。そこで、第二図に示すフローチャートに従って冷凍
サイクルの圧力制御を行なう。まず高圧圧力を検出し、
次に低圧圧力が基準値P2を満足していなければ高圧圧力
基準値P4に達していてもさらに高い圧力４高圧圧力Pd′
になるよう凝縮圧力調節弁を制御し減圧装置の入口圧力
を上昇して冷媒流量を増し３低圧圧力を７制御後低圧圧
力Ps′まで上げる。又、５基準圧力（低圧）P2に達して
いれば、４高圧圧力Pd′を８基準の高圧圧力P4まで低下
するように凝縮圧力調節弁を制御する。An embodiment of the present invention will be described below with reference to FIGS. The first figure of the operating pressure change, the 1,3 respectively low pressure Ps, Ps'2,4 the high pressure Pd, P'd, 5 is the reference pressure (low pressure) P 2, 6 before operating balance pressure P 1 and 7 are low pressure after control
P 3 , 8 indicates a standard high pressure P 4 . In FIG. 1 , the pressure before operation is at the value of P 1 (balance pressure before operation 6), and after operation, when there is no control, it follows the solid lines of low pressure Ps1 and high pressure Pd1. High pressure does not rise in winter, etc. 8
It takes time to reach the reference pressure P 4, and under low-pressure side operating conditions (low temperature region), 5 reference pressure (low pressure) P 2 is not satisfied, and frost on the evaporator and high-pressure difference in pressure are large, causing abnormal compressor operation. Cause Therefore, the pressure control of the refrigeration cycle is performed according to the flowchart shown in FIG. First, detect the high pressure,
Next, if the low-pressure pressure does not satisfy the reference value P 2 , even if the low-pressure pressure reaches the high-pressure reference value P 4 , the higher pressure 4 High-pressure pressure Pd ′
The condensing pressure control valve is controlled to increase the inlet pressure of the pressure reducing device to increase the refrigerant flow rate, and the low pressure of 3 is controlled to 7 and then to the low pressure Ps'. If the pressure reaches the 5 reference pressure (low pressure) P 2 , the condensing pressure control valve is controlled so that the 4 high pressure Pd ′ is reduced to the 8 reference high pressure P 4 .
本説明によれば、冬期の冷房運転で、高圧圧力維持と
同時に低圧圧力も積極的な制御ができる。また、低圧圧
力が基準の圧力を満足していれば、高圧圧力をできるだ
け下げるように制御しこの結果無駄な圧力上昇をしなく
なりCOPで約15〜30％の向上が可能である。さらに、室
内機室外機の分離する形の空調機ではその連絡配管長が
圧力損失のために制限されるが従来配管を太くする事で
対応したものの減圧装置前の圧力損失によるフラッシュ
ガス発生を考慮し設定圧力を上昇する必要があった。今
回は低圧側圧力を検知制限することにより自動的に対処
することができる。According to the present description, during the cooling operation in winter, the high pressure can be maintained and the low pressure can be actively controlled at the same time. If the low-pressure pressure satisfies the reference pressure, the high-pressure pressure is controlled to be as low as possible, and as a result, unnecessary pressure rise is prevented and COP can be improved by about 15 to 30%. Furthermore, in the air conditioner of the type where the indoor unit and the outdoor unit are separated, the length of the connecting pipe is limited due to pressure loss, but although it was dealt with by thickening the conventional pipe, the generation of flash gas due to the pressure loss before the decompression device is considered However, it was necessary to raise the set pressure. This time, it is possible to deal automatically by limiting the detection of the low-pressure side pressure.
第１図は、冷凍サイクルの運転圧力状態、第２図は本発
明の制御フローチャート。 １……低圧圧力Ps、２……高圧圧力Pd、５……基準圧力
（低圧）P2、６……運転前バランス圧力P1、８……基準
の高圧圧力P4 FIG. 1 is an operating pressure state of the refrigeration cycle, and FIG. 2 is a control flowchart of the present invention. 1 ...... low pressure Ps, 2 ...... high pressure Pd, 5 ...... reference pressure (low pressure) P 2, 6 ...... pre-operation balance pressure P 1, 8 ...... reference high pressure P 4 of the
───────────────────────────────────────────────────── フロントページの続き (72)発明者 植草 常雄 東京都千代田区内幸町１丁目１番６号 日本電信電話株式会社内 (72)発明者 大島 一夫 東京都千代田区内幸町１丁目１番６号 日本電信電話株式会社内 (72)発明者 三瓶 実 東京都千代田区内幸町１丁目１番６号 日本電信電話株式会社内 (72)発明者 中尾 正喜 東京都千代田区内幸町１丁目１番６号 日本電信電話株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsuneo Uekusa 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Inside Nippon Telegraph and Telephone Corporation (72) Kazuo Oshima 1-1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Japan Telegraph and Telephone Corporation (72) Inventor Sanbe Min 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Masayoshi Nakao 1-1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation Within the corporation
Claims (1)
サイクルの高圧圧力を制御するため凝縮圧力の設定値を
可変する凝縮圧力調節弁を有する冷凍サイクルの運転制
御装置において、 前記冷凍サイクルの高圧圧力及び低圧圧力を検出するセ
ンサを備え、 前記低圧圧力の値が予め定めた基準の低圧圧力（P2）よ
りも小さいときは、前記高圧圧力の値が予め定めた基準
の高圧圧力（P4）よりも上昇するように前記凝縮圧力調
節弁の設定値を大きくし、 前記低圧圧力の値が予め定めた基準の低圧圧力（P2）以
上のときは、前記高圧圧力の値が予め定めた基準の高圧
圧力（P4）以下となるように前記凝縮圧力調節弁の設定
値を可変する、 ことを特徴とする冷凍サイクルの運転制御装置。1. A refrigeration cycle operation control device comprising a compressor, a condenser, an evaporator, a decompression device and a condensing pressure control valve for varying a set value of the condensing pressure for controlling a high pressure of the refrigeration cycle, A sensor for detecting high pressure and low pressure of the cycle is provided, and when the low pressure value is smaller than a predetermined reference low pressure (P 2 ), the high pressure value is a predetermined reference high pressure. If the set value of the condensing pressure control valve is increased so as to rise above (P 4 ), and the value of the low pressure is equal to or higher than a predetermined reference low pressure (P 2 ), the value of the high pressure is An operation control device for a refrigeration cycle, wherein the set value of the condensation pressure control valve is varied so as to be equal to or lower than a predetermined reference high pressure (P 4 ).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63102585A JP2564358B2 (en) | 1988-04-27 | 1988-04-27 | Refrigeration cycle operation control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63102585A JP2564358B2 (en) | 1988-04-27 | 1988-04-27 | Refrigeration cycle operation control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01273953A JPH01273953A (en) | 1989-11-01 |
| JP2564358B2 true JP2564358B2 (en) | 1996-12-18 |
Family
ID=14331309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63102585A Expired - Lifetime JP2564358B2 (en) | 1988-04-27 | 1988-04-27 | Refrigeration cycle operation control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2564358B2 (en) |
-
1988
- 1988-04-27 JP JP63102585A patent/JP2564358B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01273953A (en) | 1989-11-01 |
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