JP3072995B2 - Air conditioner compressor control method - Google Patents
Air conditioner compressor control methodInfo
- Publication number
- JP3072995B2 JP3072995B2 JP01288930A JP28893089A JP3072995B2 JP 3072995 B2 JP3072995 B2 JP 3072995B2 JP 01288930 A JP01288930 A JP 01288930A JP 28893089 A JP28893089 A JP 28893089A JP 3072995 B2 JP3072995 B2 JP 3072995B2
- Authority
- JP
- Japan
- Prior art keywords
- compressor
- air conditioner
- expansion valve
- capacity
- control method
- 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
Landscapes
- Control Of Positive-Displacement Pumps (AREA)
- Air Conditioning Control Device (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は比較的容量の大きい空調機における圧縮機の
容量制御方法に関する。Description: TECHNICAL FIELD The present invention relates to a compressor capacity control method for an air conditioner having a relatively large capacity.
従来の装置は実開昭58−85159号に記載のように２台
の圧縮機を必要に応じ切り換えて運転していた。従っ
て、２台同時に運転開始する場合の冷凍サイクル運転時
に発生する不具合点に対し考慮されていなかった。As described in Japanese Utility Model Application Laid-Open No. 58-85159, the conventional apparatus operates by switching two compressors as needed. Therefore, no consideration has been given to the problems that occur during the refrigeration cycle operation when the two units start operating at the same time.
上記従来技術は圧縮機の運転切換時に生じる膨張弁の
追従性等冷凍サイクルの安定化については考慮されてお
らず、１台から２台運転へと容量アップする際に冷凍サ
イクルの低圧圧力が急激に低下するという問題があっ
た。このため、冷凍サイクルのバランスがくずれ低圧圧
力開閉器が設置されているものは作動し低圧々力が異常
に低止する場合も生じる。また、このような保護装置が
ない場合は異常に低い圧力の状態を何度も繰り返し運転
することとなるため圧縮機そのものに悪条件な運転をさ
せることとなる。The above prior art does not take into account stabilization of the refrigeration cycle, such as the followability of the expansion valve that occurs when the operation of the compressor is switched, and the low pressure of the refrigeration cycle suddenly increases when the capacity is increased from one to two. There was a problem that it was lowered. For this reason, the balance of the refrigeration cycle is lost, and the one in which the low pressure switch is installed operates, and the low pressure force may be abnormally low. Further, in the absence of such a protection device, an abnormally low pressure state is repeatedly operated, so that the compressor itself is operated under adverse conditions.
本発明はこのような問題を解決することを目的として
おり、さらにインバータを採用した圧縮機の容量制御を
最適な状態にする制御方法を提供することにある。It is an object of the present invention to solve such a problem, and it is another object of the present invention to provide a control method for optimizing the capacity control of a compressor employing an inverter.
上記目的を達成するため、本発明は、熱交換器、送風
装置、膨張弁、複数台の圧縮機とを有する冷凍サイクル
を備え、前記圧縮機の運転周波数を制御してその容量を
制御する空調機の圧縮制御方法において、前記容量を増
加するために前記圧縮機の運転を１台から２台に移行す
る際に、先行して運転される一方の前記圧縮機を切り換
え直前の周波数とし、前記膨張弁の開度が冷媒循環量が
確保できる値となるような特定の時間維持して運転さ
せ、その後他方の前記圧縮機の運転を開始するものであ
る。In order to achieve the above object, the present invention provides an air conditioner comprising a refrigeration cycle having a heat exchanger, a blower, an expansion valve, and a plurality of compressors, and controlling an operation frequency of the compressor to control its capacity. In the compression control method of the compressor, when the operation of the compressor is shifted from one to two in order to increase the capacity, one of the compressors operated in advance is set to the frequency immediately before switching, and The operation is performed while maintaining the opening degree of the expansion valve at a value at which the refrigerant circulation amount can be ensured, and then the operation of the other compressor is started.
容量を増加する際に、先行して運転される一方の圧縮
機の運転周波数を切り換え直前の周波数とし、膨張弁の
開度が冷媒循環量の確保できるようになるまで維持する
ので、膨張弁の開度が圧縮機容量の制御と同期し、低圧
圧力の急激な低下がなく、低圧圧力遮断を防止して信頼
性の確保ができる。When increasing the capacity, the operating frequency of one of the compressors operated in advance is set to the frequency immediately before switching, and the opening of the expansion valve is maintained until the refrigerant circulation amount can be secured. The opening is synchronized with the control of the compressor capacity, there is no sharp drop in low pressure, and low pressure shutoff is prevented to ensure reliability.
［作用］ 本発明において、複数の圧縮機構は１つの冷凍サイク
ルに組込まれ、この圧縮機構はインバータで容量制御さ
れ、１つの圧縮機構の単独運転と複数の同時運転に対
し、同一の膨張弁で制御されるため、単独の圧縮機構運
転時と複数の圧縮機構運転時の膨張弁バランス開度は大
幅に異なりそれぞれに見合った開度にしなければならな
い。本発明では膨張弁の開度追従速度を考慮して圧縮機
容量制御と同期させるため単独の圧縮機構運転から複数
運転に移行する際に、一定時間切り換え直前周波数で運
転させ、膨張弁の開度追従を待つようにし、大きな冷媒
循環量に耐えるため低圧圧力の急激な低下がなく安定し
た運転が可能となる。[Operation] In the present invention, a plurality of compression mechanisms are incorporated in one refrigeration cycle, and the capacity of the compression mechanism is controlled by an inverter. Because of the control, the expansion valve balance openings during operation of a single compression mechanism and during operation of a plurality of compression mechanisms are significantly different, and must be adjusted to the respective degrees. In the present invention, in order to synchronize with the compressor displacement control in consideration of the opening follow-up speed of the expansion valve, when shifting from a single compression mechanism operation to a plurality of operations, the operation is performed at a frequency immediately before switching for a fixed time, and the expansion valve opening Since a following operation is awaited and a large amount of refrigerant is circulated, stable operation can be performed without a sharp decrease in low pressure.
以下、本発明の一実施例を第１図、第２図により説明
する。第１図は横軸に時間縦軸に圧縮機周波数、膨張弁
開度、圧力等冷凍サイクル運転状態を示す。第２図は冷
凍サイクル運転中の容量制御における周波数上昇制御の
フローチャートを示す。第１図では、空調機容量制御増
加時に従来は１台から２台へ移行するときは破線に示す
ように、従来の先行運転及び追加の圧縮機３に示すよう
同時に運転されたため、従来の低圧圧力９、のように低
圧が、低圧カット設定値10、近くまで低下するため異常
低下の状態となり保護装置が作動するか圧縮機にとって
好ましくない運転を生じる。これは、従来の高圧圧力
７、が圧縮機周波数上昇に従って徐々に上昇するもの
の、従来膨張弁開度５、に示すように膨張弁開度追従速
度が一定のため２台で運転した際に要求される冷媒循環
量が確保できる弁開度にならないうちに周波数が上昇す
るため低圧圧力が急激に低下することを示している。本
実施例では膨張弁追従速度、圧縮機周波数上昇速度が一
定であるために圧縮機の制御方法を改良し、１台から２
台運転へ移行する際、先行運転圧縮機１、を特定の値で
特定の時間（例えば74HZで５分間）維持し、膨張弁の上
昇を、膨張弁開度４、の様に開くのを待つ形とし、これ
によって、本発明の高圧圧力６、本発明の低圧圧力８、
の曲線に示すように急激な圧力変化を防止している。こ
の後、追加の圧縮機２、に示すよう追加運転を開始する
ため低圧圧力は比較的ゆるやかに正常な値へ移行してい
くことができる。第２図はこの圧縮機始動方法をフロー
チャート図に示したものである。An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, the horizontal axis indicates time, and the vertical axis indicates a refrigeration cycle operation state such as compressor frequency, expansion valve opening, and pressure. FIG. 2 shows a flowchart of the frequency increase control in the capacity control during the refrigeration cycle operation. In FIG. 1, when the conventional air conditioner shifts from one to two when the capacity control of the air conditioner is increased, as shown by the broken line, the conventional preceding operation and the additional compressor 3 are operated simultaneously, so that the conventional low pressure Since the low pressure, such as the pressure 9, drops to near the low pressure cut set value 10, the state becomes abnormally low, causing the protection device to operate or an undesired operation for the compressor. Although the conventional high pressure 7 gradually rises as the compressor frequency rises, it is required when two units are operated because the expansion valve follow-up speed is constant as shown in the conventional expansion valve opening 5. This indicates that the low-pressure pressure sharply drops because the frequency increases before the valve opening degree at which the amount of the circulated refrigerant circulates can be secured. In this embodiment, since the expansion valve follow-up speed and the compressor frequency rise speed are constant, the control method of the compressor is improved.
When shifting to the stand operation, the preceding operation compressor 1 is maintained at a specific value for a specific time (for example, 74 HZ for 5 minutes), and waits for the expansion valve to open as indicated by the expansion valve opening 4. In the form of a high pressure 6 according to the invention, a low pressure 8 according to the invention,
As shown by the curve, rapid pressure change is prevented. Thereafter, as shown in the additional compressor 2, the low pressure can relatively gradually shift to a normal value in order to start the additional operation. FIG. 2 is a flowchart showing this compressor starting method.
本発明によれば、複数台の圧縮機制御時に容量アップ
を行っても急激な低圧圧力低下を防止でき、低圧圧力遮
断（保護装置作動）や圧縮機運転の異常状態を防止でき
るので安定した冷凍サイクル運転および圧縮機信頼性確
保ができる。ADVANTAGE OF THE INVENTION According to the present invention, even if the capacity is increased when controlling a plurality of compressors, it is possible to prevent a sudden low pressure drop, and to prevent low pressure pressure shutoff (protection device operation) and abnormal operation of the compressor, thereby achieving stable refrigeration. Cycle operation and compressor reliability can be ensured.
第１図は本発明の一実施例を示し、横軸に時間、縦軸に
圧縮機周波数その他をとった冷凍サイクル運転状態説明
線図、第２図は本発明の圧縮機周波数増加時の制御フロ
ーチャートを示す。 １……先行運転圧縮機周波数、４……膨張弁開度 ９……従来の低圧圧力。FIG. 1 shows an embodiment of the present invention, in which a horizontal axis represents time, a vertical axis represents a compressor frequency and others, and a refrigeration cycle operation state explanatory diagram. FIG. 2 is a control of the present invention when the compressor frequency is increased. 3 shows a flowchart. 1 ... preceding operation compressor frequency 4 ... expansion valve opening 9 ... conventional low pressure.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) F25B 1/00 F04B 49/06 F24F 11/02 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) F25B 1/00 F04B 49/06 F24F 11/02
Claims (1)
縮機とを有する冷凍サイクルを備え、前記圧縮機の運転
周波数を制御してその容量を制御する空調機の圧縮機制
御方法において、 前記容量を増加するために前記圧縮機の運転を１台から
２台に移行する際に、先行して運転される一方の前記圧
縮機を切り換え直前の周波数とし、前記膨張弁の開度が
冷媒循環量の確保できる値となるような特定の時間維持
して運転させ、その後他方の前記圧縮機の運転を開始す
ることを特徴とする空調機の圧縮機制御方法。1. A compressor control method for an air conditioner, comprising: a refrigeration cycle having a heat exchanger, a blower, an expansion valve, and a plurality of compressors, wherein an operation frequency of the compressor is controlled to control its capacity. In shifting the operation of the compressor from one to two in order to increase the capacity, one of the compressors operated in advance is set to the frequency immediately before switching, and the opening degree of the expansion valve is set. A method for controlling the compressor of an air conditioner, comprising: operating the compressor while maintaining a specific time so that the refrigerant circulation amount can be ensured, and then starting the operation of the other compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01288930A JP3072995B2 (en) | 1989-11-08 | 1989-11-08 | Air conditioner compressor control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01288930A JP3072995B2 (en) | 1989-11-08 | 1989-11-08 | Air conditioner compressor control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03152351A JPH03152351A (en) | 1991-06-28 |
| JP3072995B2 true JP3072995B2 (en) | 2000-08-07 |
Family
ID=17736649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01288930A Expired - Fee Related JP3072995B2 (en) | 1989-11-08 | 1989-11-08 | Air conditioner compressor control method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3072995B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5369958A (en) * | 1992-10-15 | 1994-12-06 | Mitsubishi Denki Kabushiki Kaisha | Air conditioner |
| KR100382488B1 (en) * | 2000-11-10 | 2003-05-09 | 엘지전자 주식회사 | Method for controlling Linear Expantion Valve of air conditioner with 2 compressors |
-
1989
- 1989-11-08 JP JP01288930A patent/JP3072995B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03152351A (en) | 1991-06-28 |
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