JP3470042B2 - Screw compressor pressure control method - Google Patents
Screw compressor pressure control methodInfo
- Publication number
- JP3470042B2 JP3470042B2 JP12258398A JP12258398A JP3470042B2 JP 3470042 B2 JP3470042 B2 JP 3470042B2 JP 12258398 A JP12258398 A JP 12258398A JP 12258398 A JP12258398 A JP 12258398A JP 3470042 B2 JP3470042 B2 JP 3470042B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- screw compressor
- compressor
- load operation
- 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 - Lifetime
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- Applications Or Details Of Rotary Compressors (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、スクリュー圧縮機
の圧力制御方法に係り、吸入側にオンオフ式制御弁を備
え、全負荷運転および無負荷運転を効果的に行うスクリ
ュー圧縮機の圧力制御方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure control method for a screw compressor, which is equipped with an on-off type control valve on the suction side to effectively perform full load operation and no load operation. It is about.
【０００２】[0002]
【従来の技術】従来のオンオフ式制御弁を備えたスクリ
ュー圧縮機の圧力制御装置は、例えば特公平１−３３６
７６号公報に記載されているように、スクリュー圧縮機
の吸入側にオンオフ式制御弁と吐出放風弁を有し、全負
荷運転により吐出側圧力を上昇させ、吐出側圧力がある
設定値を超えるとオンオフ式制御弁を閉じ、かつ放風弁
を開放して無負荷運転に切り換え、その後吐出側のガス
貯槽内圧力が低下し、ある設定値以下になると、オンオ
フ式制御弁を開にするとともに放風弁を閉じて全負荷運
転に切り換えるようにしている。2. Description of the Related Art A conventional pressure control device for a screw compressor having an on-off type control valve is disclosed in, for example, Japanese Patent Publication No. 1-336.
As described in Japanese Patent Laid-Open No. 76-76, an on-off type control valve and a discharge blow-off valve are provided on the suction side of a screw compressor, and the discharge side pressure is increased by full load operation to set a certain set value on the discharge side. When it exceeds, the on-off control valve is closed and the blow-off valve is opened to switch to no-load operation. After that, when the pressure in the gas storage tank on the discharge side decreases and falls below a certain set value, the on-off control valve is opened. At the same time, the blowoff valve is closed to switch to full load operation.
【０００３】このような従来の装置では、スクリュー圧
縮機の吐出側圧力を圧力スイッチで検出し、この検出値
に応じてマイコンなどの制御装置から全負荷−無負荷運
転の切替え指令信号を発していた。In such a conventional device, the pressure on the discharge side of the screw compressor is detected by a pressure switch, and a control device such as a microcomputer issues a command signal for switching between full load and no load according to the detected value. It was
【０００４】[0004]
【発明が解決しようとする課題】上記従来技術では、全
負荷−無負荷運転の切替え指令信号を発する圧力設定値
が固定されているものであるため、スクリュー圧縮機の
吐出側で一定の圧力値で全負荷運転と無負荷運転を切り
替えていた。この吐出圧力の設定値は、末端（ユーザー
設備におけるガス運用機器）の消費流量が大きいほど、
スクリュー圧縮機の吐出口から末端までの間の圧力損失
が大きくなり、末端の圧力は低下するため、予想される
最大消費流量時に必要最低圧力となるように決めてい
る。In the above-mentioned prior art, since the pressure set value for issuing the command signal for switching between full load and no load operation is fixed, a constant pressure value is set on the discharge side of the screw compressor. Was switching between full load operation and no load operation. The set value of this discharge pressure is as follows:
Since the pressure loss from the discharge port of the screw compressor to the end becomes large and the pressure at the end decreases, the minimum pressure is determined to be the required minimum pressure at the expected maximum consumption flow rate.
【０００５】したがって、消費流量が少なくなると、ス
クリュー圧縮機の吐出口から末端までの間の圧力損失が
小さくなるため、末端圧力が必要以上に上昇する。この
ため、スクリュー圧縮機は本来の必要圧力よりも高い吐
出圧力で運転されることになり、高圧運転による不要な
電力を消費するという不具合があった。また、末端圧力
が高いため消費流量も必要以上に消費するという問題が
あった。Therefore, when the consumption flow rate decreases, the pressure loss from the discharge port to the end of the screw compressor decreases, and the end pressure rises more than necessary. Therefore, the screw compressor is operated at a discharge pressure higher than the originally required pressure, and there is a problem that unnecessary power is consumed due to high pressure operation. Further, since the terminal pressure is high, there is a problem that the consumption flow rate is consumed more than necessary.
【０００６】本発明は、上記従来技術の課題を解決する
ためになされたもので、本発明の目的は、消費流量に応
じてスクリュー圧縮機の容量を制御するための圧力設定
値を自動調整させることにより、必要以上の不要な高い
圧力でスクリュー圧縮機が運転されることを防止し、不
要な電力を消費することと必要以上に消費流量が増加す
ることを防止するスクリュー圧縮機の圧力制御方法を提
供することにある。The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to automatically adjust a pressure set value for controlling the capacity of a screw compressor according to a consumed flow rate. This prevents the screw compressor from operating at an unnecessarily high pressure that is higher than necessary, and prevents unnecessary power consumption and an unnecessary increase in the flow rate of the screw compressor. To provide.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明のスクリュー圧縮機の圧力制御方法に係る構
成は、スクリュー圧縮機の吸入側に設けたオンオフ式制
御弁を当該圧縮機吐出側の検知圧力に応じて制御し、前
記検知圧力が下限圧力設定値になると前記オンオフ式制
御弁をオンして全負荷運転を行い、前記検知圧力が上限
圧力設定値になると前記オンオフ式制御弁をオフして無
負荷運転を行うことを繰返すスクリュー圧縮機の圧力制
御方法において、全負荷運転及び無負荷運転の１サイク
ルを含む所定の時間内における全負荷運転時間の合計か
ら消費流量を算出し、末端圧力が一定となるように前記
上限圧力設定値および前記下限圧力設定値を自動調整さ
せるようにしたものである。To achieve the above object, according to the solution to ## configuration <br/> formed according to the pressure control method for a screw compressor of the present invention, on-off type system provided on the suction side of the screw compressor
The control valve is controlled according to the pressure detected on the discharge side of the compressor,
When the detected pressure reaches the lower limit pressure setting value, the on / off type control
When the control valve is turned on and full load operation is performed, the detected pressure is the upper limit.
When the pressure reaches the set value, the on / off control valve is turned off and
Pressure control of screw compressor that repeats load operation
One cycle of full load operation and no load operation
Is the total of full load operating time within a predetermined time including
Calculate the consumption flow rate from the above and make sure that the terminal pressure becomes constant.
The upper limit pressure setting value and the lower limit pressure setting value are automatically adjusted.
It was made to be able to.
【０００８】[0008]
【０００９】[0009]
【００１０】[0010]
【００１１】[0011]
【００１２】[0012]
【００１３】[0013]
【発明の実施の形態】本発明の実施形態について図１な
いし図５を参照して説明する。図１は、本発明の一実施
形態を示すスクリュー圧縮機の全体構成を示す系統図、
図２は、本発明のスクリュー圧縮機の圧力制御方法を適
用する圧縮機設備の系統図、図３は、本発明のスクリュ
ー圧縮機の他の圧力制御方法を適用する圧縮機設備の系
統図である。DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a system diagram showing an overall configuration of a screw compressor showing one embodiment of the present invention,
2 is a system diagram of compressor equipment to which the pressure control method of the screw compressor of the present invention is applied, and FIG. 3 is a system diagram of compressor equipment to which another pressure control method of the screw compressor of the present invention is applied. is there.
【００１４】図２，３に示す圧縮機設備は、図１に示す
スクリュー圧縮機を採用するユーザー設備の一例を示す
ものである。まず、図２，３を参照して設備の全体構成
を説明する。図２，３において、１はスクリュー圧縮
機、２は制御装置、３は、スクリュー圧縮機１の吐出圧
力を検出する圧力検出器で、この圧力検出器３は圧縮機
吐出口４に備えられている。５は、吐出側に設けたガス
貯槽、６はフィルタ、７はガス分離装置または除湿装
置、８はガスヘッダ、９は需要側のガス運用機器で、こ
れらガス貯槽５、フィルタ６、ガス分離装置または除湿
装置７、ガスヘッダ８、需要側のガス運用機器９は、需
要側の所謂ユーザー設備を構成するものである。The compressor equipment shown in FIGS. 2 and 3 is an example of user equipment that employs the screw compressor shown in FIG. First, the overall configuration of the equipment will be described with reference to FIGS. 2 and 3, 1 is a screw compressor, 2 is a control device, 3 is a pressure detector for detecting the discharge pressure of the screw compressor 1, and the pressure detector 3 is provided at the compressor discharge port 4. There is. 5 is a gas storage tank provided on the discharge side, 6 is a filter, 7 is a gas separator or dehumidifier, 8 is a gas header, and 9 is a gas operation device on the demand side. These gas storage tank 5, filter 6, gas separator or The dehumidification device 7, the gas header 8, and the gas operation device 9 on the demand side constitute so-called user equipment on the demand side.
【００１５】次に、図１を参照して上記ユーザー設備に
採用されるスクリュー圧縮機の圧力制御装置の構成を説
明する。図１は、スクリュー圧縮機の空気系統と容量制
御装置の構成を示したものである。スクリュー圧縮機１
（図２，３参照）の全負荷運転状態では、吸入口１１か
ら吸入した空気は吸入フイルター１２を通り、全開状態
の吸入弁（オンオフ式制御弁）１３を通り圧縮機本体１
６へ入る。圧縮機本体１６で圧縮された高温高圧のガス
は、逆止弁１７、アフタークーラ１８を通ってガス貯槽
５へ送り込まれる。Next, the structure of the pressure control device for the screw compressor employed in the user equipment will be described with reference to FIG. FIG. 1 shows a configuration of an air system and a capacity control device of a screw compressor. Screw compressor 1
In the full load operation state (see FIGS. 2 and 3), the air sucked from the suction port 11 passes through the suction filter 12 and the suction valve (on-off type control valve) 13 in the fully opened state, and the compressor body 1
Enter 6. The high-temperature and high-pressure gas compressed by the compressor body 16 is sent to the gas storage tank 5 through the check valve 17 and the aftercooler 18.
【００１６】ガス貯槽５内に溜められたガスは、ガス消
費ライン１９へ送られ消費される。なお、この状態では
放風弁１４は閉じている。吸入弁１３と放風弁１４を駆
動している油圧ピストン１５は、四方電磁弁２４と油圧
ポンプ２３によつて貯油槽２２から供給された油の油圧
で、吸入弁１３を開、放風弁１４を閉にする位置に押さ
れている。The gas stored in the gas storage tank 5 is sent to the gas consumption line 19 and consumed. In this state, the blowoff valve 14 is closed. The hydraulic piston 15 that drives the intake valve 13 and the blowoff valve 14 opens the intake valve 13 with the oil pressure of the oil supplied from the oil storage tank 22 by the four-way solenoid valve 24 and the hydraulic pump 23, and opens the blowoff valve. It is pushed to the position where 14 is closed.
【００１７】一般に全負荷運転時は、消費流量よりもス
クリュー圧縮機１の吐出量の方が多く、吐出側圧力は上
昇していく。この吐出側圧力を圧力検出器３で検出し制
御装置２へ送る。制御装置２では、検出された吐出側圧
力Ｐが予め設定されている上限圧力設定値Ｐｍａｘ（後
述する図４参照）に達すると、四方電磁弁２４に指令信
号を発して四方電磁弁２４の油通路を切り替え、油圧ピ
ストン１５を作動させて吸入弁１３を閉にし、同時に放
風弁１４を開にして圧縮機本体１６を無負荷運転状態に
する。吸入弁１３から圧縮機本体１６へ漏れ込んだガス
は、圧縮機本体１６から出たのち、放風弁１４を通り、
放風サイレンサ２０を通って放風口２１から大気へ放風
される。Generally, during full load operation, the discharge amount of the screw compressor 1 is larger than the consumption flow rate, and the discharge side pressure rises. This discharge side pressure is detected by the pressure detector 3 and sent to the control device 2. In the control device 2, when the detected discharge-side pressure P reaches a preset upper limit pressure set value Pmax (see FIG. 4, which will be described later), a command signal is issued to the four-way solenoid valve 24 to send the oil of the four-way solenoid valve 24. The passage is switched, the hydraulic piston 15 is operated to close the intake valve 13, and at the same time, the blowoff valve 14 is opened to put the compressor body 16 in a no-load operation state. The gas leaked from the intake valve 13 to the compressor body 16 exits from the compressor body 16 and then passes through the blowoff valve 14 to
The air is blown to the atmosphere through the blower silencer 20 from the blowoff port 21.
【００１８】無負荷運転状態では、圧縮機本体１６から
ガス貯槽５へガスは供給されず、ガス貯槽５内のガスは
消費されていくから、ガス貯槽５を含む吐出側圧力Ｐが
低下していき、予め設定している下限圧力設定値Ｐｍｉ
ｎ（後述する図４参照）まで圧力が低下すると制御装置
２により四方電磁弁２４を切り替えて再度全負荷運転状
態にする構成となつている。In the no-load operation state, the gas is not supplied from the compressor body 16 to the gas storage tank 5 and the gas in the gas storage tank 5 is consumed, so that the discharge side pressure P including the gas storage tank 5 decreases. The lower limit pressure set value Pmi set in advance
When the pressure drops to n (see FIG. 4, which will be described later), the control device 2 switches the four-way solenoid valve 24 to bring it into the full-load operation state again.
【００１９】次に、図１，３を参照してユーザー設備に
採用されたスクリュー圧縮機の圧力制御方法について説
明する。このスクリュー圧縮機の圧力制御方法は、スク
リュー圧縮機の吸入側に設けたオンオフ式制御弁（吸入
弁１３）を圧縮機吐出側の検知した圧力に応じて制御
し、全負荷運転および無負荷運転を行うスクリュー圧縮
機において、前記スクリュー圧縮機１負荷側の消費流量
を算出し、この使用量に応じて、前記オンオフ式制御弁
をオフする上限圧力設定値および前記オンオフ式制御弁
をオンする下限圧力設定値を変化させるものである。Next, the pressure control method of the screw compressor adopted in the user equipment will be described with reference to FIGS. The pressure control method of this screw compressor is such that an on-off control valve (suction valve 13) provided on the suction side of the screw compressor is controlled according to the pressure detected on the discharge side of the compressor to perform full load operation and no load operation. In the screw compressor for performing the above, the consumption flow rate on the load side of the screw compressor 1 is calculated, and the upper limit pressure set value for turning off the on / off type control valve and the lower limit for turning on the on / off type control valve are calculated according to the usage amount. The pressure setting value is changed.
【００２０】前記オンオフ式制御弁（吸入弁１３）のオ
ンオフ圧力設定値を、予め決められた圧縮機設備末端の
機器の中で、最も最低動作（使用）圧力の低い機器の圧
力に対して、余裕を考慮した設定値圧力以上で、かつ圧
縮機吐出口４から圧縮機設備末端のガス運用機器９まで
の圧力損失を全負荷−無負荷運転サイクルから幾つかの
周期をサンプリングし、一定周期でサンプル演算し、そ
の都度最適なオンオフ式制御弁をオフとする上限圧力設
定値および前記オンオフ式制御弁をオンとする下限圧力
設定値を自動調整するものである。The on-off pressure set value of the on-off type control valve (suction valve 13) is set to the pressure of the equipment having the lowest minimum operation (use) pressure among the equipment at the end of the predetermined compressor equipment. The pressure loss from the compressor discharge port 4 to the gas operation device 9 at the end of the compressor equipment is set to a value equal to or higher than the set pressure in consideration of the margin, and several cycles are sampled from the full load-no-load operation cycle to obtain a constant cycle. A sample calculation is performed, and the optimum upper limit pressure setting value for turning off the on / off type control valve and the optimum lower limit pressure setting value for turning on the on / off type control valve are automatically adjusted each time.
【００２１】さらに自動調整された上限圧力設定値およ
び下限圧力設定値で全負荷−無負荷運転を行い、その運
転サイクルをフィードバックして刻々と変化する消費流
量に対応する制御を行うことを特徴とするものである。Further, a full load-no-load operation is performed with the automatically adjusted upper limit pressure setting value and lower limit pressure setting value, and the operation cycle is fed back to perform control corresponding to the constantly changing consumption flow rate. To do.
【００２２】次に、図３を参照してスクリュー圧縮機の
他の圧力制御方法について説明する。上述の図１の容量
制御方法の精度を上げるために、圧縮機設備末端のガス
運用機器９部に設けた圧力検出器１０の検知した圧力と
前記の圧力検出器３の検知した圧力との圧力差を演算
し、その圧力差と全負荷−無負荷運転サイクルからサン
プル演算した圧力損失との偏差を、オンオフ式制御弁を
オフとする上限圧力設定値および前記オンオフ式制御弁
をオンとする下限圧力設定値を自動調整する演算機能に
フィードバックするようにしている。Next, another pressure control method for the screw compressor will be described with reference to FIG. In order to improve the accuracy of the capacity control method of FIG. 1 described above, the pressure detected by the pressure detector 10 provided in the gas operation device 9 at the end of the compressor facility and the pressure detected by the pressure detector 3 described above. The difference is calculated, and the difference between the pressure difference and the pressure loss sampled from the full load-no-load operation cycle is used as the upper limit pressure setting value for turning off the on-off control valve and the lower limit for turning on the on-off control valve. The pressure setting value is fed back to the calculation function that automatically adjusts it.
【００２３】ここで、図４および図５を参照して、上限
圧力設定値および下限圧力設定値を自動調整する演算機
能について説明する。図４は、本発明のスクリュー圧縮
機における吐出圧力の変化を示す線図、図５は、本発明
のスクリュー圧縮機における動力の変化とを示す線図で
ある。図４では、横軸に時間経過、縦軸に吐出圧力の変
化を示し、図５では、横軸に時間経過、縦軸に動力の変
化を示している。Here, the arithmetic function for automatically adjusting the upper limit pressure setting value and the lower limit pressure setting value will be described with reference to FIGS. 4 and 5. FIG. 4 is a diagram showing a change in discharge pressure in the screw compressor of the present invention, and FIG. 5 is a diagram showing a change in power of the screw compressor of the present invention. In FIG. 4, the abscissa axis represents time, the ordinate axis represents change in discharge pressure, and in FIG. 5, the abscissa axis represents lapse of time and the ordinate axis represents power change.
【００２４】図４に示すように、スクリュー圧縮機１が
全負荷状態では、圧縮機から供給される空気量が消費流
量より多いため、吐出側圧力が上昇し上限圧力設定値Ｐ
ｍａｘに達すると、スクリュー圧縮機１は全負荷運転か
ら無負荷運転に切り替わる。無負荷運転状態では、スク
リュー圧縮機１からの空気の供給がなく、ガス貯槽５内
の空気を消費するに従って、吐出側圧力は低下する（線
ａ参照）。吐出側圧力が下限圧力設定値Ｐｍｉｎまで低
下すると、スクリュー圧縮機１は無負荷運転から全負荷
運転に切り替わり、吐出側圧力状態が再び上昇する。以
後同様の動作を繰り返す。As shown in FIG. 4, when the screw compressor 1 is fully loaded, the amount of air supplied from the compressor is larger than the flow rate consumed, so the discharge side pressure rises and the upper limit pressure set value P
When max is reached, the screw compressor 1 switches from full load operation to no load operation. In the no-load operation state, the air is not supplied from the screw compressor 1, and the discharge side pressure decreases as the air in the gas storage tank 5 is consumed (see line a). When the discharge side pressure drops to the lower limit pressure set value Pmin, the screw compressor 1 switches from no-load operation to full load operation, and the discharge side pressure state rises again. After that, the same operation is repeated.
【００２５】すなわち、図４において、Δｔｏは全負荷
運転状態時間、Δｔｕは無負荷運転状態時間、Δｔ
1は、全負荷運転状態時間Δｔｏと無負荷運転状態時間
Δｔｕとを合計した第１サイクルを示し、Δｔ2は、次
の全負荷運転状態時間Δｔｏ´と無負荷運転状態時間Δ
ｔｕ´とを合計した第２サイクルを示している。以後第
３，第４，…とサイクルを繰り返す。That is, in FIG. 4, Δto is the full load operating state time, Δtu is the no-load operating state time, and Δt.
1 indicates the first cycle in which the full-load operating state time Δto and the no-load operating state time Δtu are summed up, and Δt 2 is the next full-load operating state time Δto ′ and the no-load operating state time Δto.
The second cycle, which is the sum of tu ′ and the tu ′, is shown. Thereafter, the cycle of the third, fourth, ... Is repeated.
【００２６】スクリュー圧縮機１の全負荷状態の動力を
示す。前述のように全負荷運転状態時間をΔｔｏ、無負
荷運転状態時間をΔｔｕとし、スクリュー圧縮機１の風
量をＱとすると、消費流量Ｑ´は次式で表わされる。The power of the screw compressor 1 under full load is shown. As described above, when the full-load operating state time is Δto, the no-load operating state time is Δtu, and the air volume of the screw compressor 1 is Q, the consumption flow rate Q ′ is expressed by the following equation.
【数１】 [Equation 1]
【００２７】図２における圧縮機吐出口４とガス運用機
器９との間の圧力損失ΔＰは、この消費流量Ｑ´の２乗
に比例し変化する。消費流量Ｑ´が小さくなると圧力損
失ΔＰも小さくなるが、圧力検出器３の上限圧力設定値
Ｐｍａｘと下限圧力設定値Ｐｍｉｎが変化しないとガス
運用機器９における圧力は、必然的に圧力損失ΔＰが小
さくなった量だけ高くなる。しかし、ガス運用機器９に
おける圧力は必要以上に高くする必要はなく、圧力損失
ΔＰが小さくなった量だけ圧力検出器３の設定値を、図
４に示す上限圧力設定値Ｐ´ｍａｘ、下限圧力設定値Ｐ
´ｍｉｎに下げる（線ｂ参照）ことによって、ガス運用
機器９における圧力の上昇を防止でき、消費流量Ｑ´の
増加を防止し、かつスクリュー圧縮機１の全負荷状態で
の運転動力を低減することができる。The pressure loss ΔP between the compressor discharge port 4 and the gas operation device 9 in FIG. 2 changes in proportion to the square of the consumed flow rate Q '. Although the pressure loss ΔP also decreases as the consumed flow rate Q ′ decreases, the pressure in the gas operation device 9 inevitably decreases as the pressure loss ΔP unless the upper limit pressure setting value Pmax and the lower limit pressure setting value Pmin of the pressure detector 3 change. The smaller the amount, the higher it becomes. However, the pressure in the gas operation device 9 does not need to be set higher than necessary, and the set values of the pressure detector 3 are set to the upper limit pressure set value P′max and the lower limit pressure shown in FIG. Set value P
By lowering it to'min (see line b), it is possible to prevent the pressure in the gas operation device 9 from rising, prevent the consumption flow rate Q 'from increasing, and reduce the operating power of the screw compressor 1 in the full load state. be able to.
【００２８】すなわち、図５に示すように、スクリュー
圧縮機１の全負荷運転時の動力を、ＬｍａｘとＬｍｉｎ
から、Ｌ´ｍａｘとＬ´ｍｉｎへ低減できる。なお、図
５の線ａ，ｂは、図４の線ａ，ｂに対応する。That is, as shown in FIG. 5, the power during full load operation of the screw compressor 1 is set to Lmax and Lmin.
From L'max to L'min. The lines a and b in FIG. 5 correspond to the lines a and b in FIG.
【００２９】以上本発明の実施の形態によれば、スクリ
ュー圧縮機負荷側の消費流量の使用量に応じて、吐出圧
力の上限圧力設定値および下限圧力設定値が変化し自動
調整されるので、スクリュー圧縮機の運転圧力を最適化
できると共に末端圧力を一定にすることができる。した
がって、消費流量とスクリュー圧縮機の運転動力の増加
を防止することができる。As described above, according to the embodiment of the present invention, the upper limit pressure setting value and the lower limit pressure setting value of the discharge pressure are changed and automatically adjusted according to the usage amount of the consumed flow rate on the load side of the screw compressor. The operating pressure of the screw compressor can be optimized and the terminal pressure can be kept constant. Therefore, it is possible to prevent the consumption flow rate and the operating power of the screw compressor from increasing.
【００３０】また、上記技術的手段に加え、フィードバ
ック制御を用いることにより、精度良く末端圧力を一定
にすることができる。したがって、より効果的に消費流
量とスクリュー圧縮機の運転動力の増加を防止すること
ができる。よつて、使用エネルギが可能となり、大きな
経済的効果が期待できる。By using feedback control in addition to the above technical means, the terminal pressure can be made constant with high accuracy. Therefore, it is possible to more effectively prevent the consumption flow rate and the operating power of the screw compressor from increasing. Therefore, it becomes possible to use energy, and a great economic effect can be expected.
【００３１】[0031]
【発明の効果】以上詳細に説明したように、本発明によ
れば、消費流量に応じてスクリュー圧縮機の容量を制御
するための圧力設定値を自動調整させることにより、必
要以上の不要な高い圧力でスクリュー圧縮機が運転され
ることを防止し、不要な電力を消費することと必要以上
に消費流量が増加することを防止するスクリュー圧縮機
の圧力制御方法を提供することができる。As described in detail above, according to the present invention, by automatically adjusting the pressure set value for controlling the capacity of the screw compressor according to the consumed flow rate, it is possible to achieve an unnecessarily high level. It is possible to provide a pressure control method for a screw compressor, which prevents the screw compressor from operating at a pressure, consumes unnecessary electric power, and prevents the consumption flow rate from increasing more than necessary.
【図１】本発明の一実施形態を示すスクリュー圧縮機の
全体構成を示す系統図である。FIG. 1 is a system diagram showing an overall configuration of a screw compressor showing an embodiment of the present invention.
【図２】本発明のスクリュー圧縮機の圧力制御方法を適
用する圧縮機設備の系統図である。FIG. 2 is a system diagram of compressor equipment to which the pressure control method for a screw compressor of the present invention is applied.
【図３】本発明のスクリュー圧縮機の他の圧力制御方法
を適用する圧縮機設備の系統図である。FIG. 3 is a system diagram of compressor equipment to which another pressure control method of the screw compressor of the present invention is applied.
【図４】本発明のスクリュー圧縮機における吐出圧力の
変化を示す線図である。FIG. 4 is a diagram showing a change in discharge pressure in the screw compressor of the present invention.
【図５】本発明のスクリュー圧縮機における動力の変化
を示す線図である。FIG. 5 is a diagram showing a change in power in the screw compressor of the present invention.
１…スクリュー圧縮機、２…制御装置、３…圧力検出
器、４…圧縮機吐出口、５…ガス貯槽、８…ガスヘッ
ダ、９…ガス運用機器、１０…圧力検出器、１３…吸入
弁、１４…放風弁、１６…圧縮機本体、１８…アフター
クーラ、１９…ガス消費ライン、２４…四方電磁弁。DESCRIPTION OF SYMBOLS 1 ... Screw compressor, 2 ... Control device, 3 ... Pressure detector, 4 ... Compressor discharge port, 5 ... Gas storage tank, 8 ... Gas header, 9 ... Gas operating equipment, 10 ... Pressure detector, 13 ... Suction valve, 14 ... Blowoff valve, 16 ... Compressor body, 18 ... Aftercooler, 19 ... Gas consumption line, 24 ... Four-way solenoid valve.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平４−159491（ＪＰ，Ａ) 特開 昭59−180613（ＪＰ，Ａ) 特開 平９−32781（ＪＰ，Ａ) 特開 昭57−19199（ＪＰ，Ａ) 特開 平５−71481（ＪＰ，Ａ) 実公 平１−33676（ＪＰ，Ｙ２) (58)調査した分野(Int.Cl.7，ＤＢ名) F04C 29/10 321 F04B 49/06 ─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-4-159491 (JP, A) JP-A-59-180613 (JP, A) JP-A-9-32781 (JP, A) JP-A-57- 19199 (JP, A) JP-A-5-71481 (JP, A) Fukuko 1-333676 (JP, Y2) (58) Fields investigated (Int.Cl. 7 , DB name) F04C 29/10 321 F04B 49/06
Claims (2)
オフ式制御弁を当該圧縮機吐出側の検知圧力に応じて制
御し、前記検知圧力が下限圧力設定値になると前記オン
オフ式制御弁をオンして全負荷運転を行い、前記検知圧
力が上限圧力設定値になると前記オンオフ式制御弁をオ
フして無負荷運転を行うことを繰返すスクリュー圧縮機
の圧力制御方法において、全負荷運転及び無負荷運転の
１サイクルを含む所定の時間内における全負荷運転時間
の合計から消費流量を算出し、末端圧力が一定となるよ
うに前記上限圧力設定値および前記下限圧力設定値を自
動調整させることを特徴とするスクリュー圧縮機の圧力
制御方法。1. A on-off control valve provided on the suction side of the screw compressor is controlled in response to the detection known pressure of the compressor discharge side, the ON and the sensed pressure is lower pressure setpoint
The off-type control valve is turned on to perform full load operation , and
When the force reaches the upper limit pressure setting value, the on / off type control valve is turned on.
In the pressure control method for the screw compressor, which is repeated by turning off the load and performing no-load operation.
Calculating a consumed flow rate from the sum of full load operation time within a predetermined time including the one cycle, end the pressure is equal to or to automatically adjust the upper limit pressure set value and the lower limit pressure setpoint to be constant Pressure control method of screw compressor.
吸入側に設けたオンオフ式制御弁の制御にフィードバッ
クさせることを特徴とする請求項１記載のスクリュー圧
縮機の圧力制御方法。2. The pressure control method for a screw compressor according to claim 1, wherein the terminal pressure is detected and fed back to the control of an on / off type control valve provided on the suction side of the screw compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12258398A JP3470042B2 (en) | 1998-05-06 | 1998-05-06 | Screw compressor pressure control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12258398A JP3470042B2 (en) | 1998-05-06 | 1998-05-06 | Screw compressor pressure control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11324963A JPH11324963A (en) | 1999-11-26 |
| JP3470042B2 true JP3470042B2 (en) | 2003-11-25 |
Family
ID=14839513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12258398A Expired - Lifetime JP3470042B2 (en) | 1998-05-06 | 1998-05-06 | Screw compressor pressure control method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3470042B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109209884A (en) * | 2018-10-24 | 2019-01-15 | 佛山科学技术学院 | A kind of control method of air compressor gas valve |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4520608B2 (en) * | 2000-09-20 | 2010-08-11 | 株式会社日立プラントテクノロジー | Screw compressor |
| JP4786443B2 (en) | 2006-07-11 | 2011-10-05 | 株式会社日立産機システム | Compressed air production facility |
| JP5211564B2 (en) * | 2007-07-09 | 2013-06-12 | 株式会社日立プラントテクノロジー | Compressor device and control method of compressor device |
| JP4756081B2 (en) * | 2009-04-30 | 2011-08-24 | 株式会社日立産機システム | Screw compressor |
| JP5325701B2 (en) * | 2009-08-10 | 2013-10-23 | 北越工業株式会社 | Control method of air compressor and air compressor |
| JP5530825B2 (en) * | 2010-06-18 | 2014-06-25 | 株式会社日立製作所 | Screw compressor and its control device |
| JP6746714B2 (en) * | 2016-12-28 | 2020-08-26 | 株式会社日立産機システム | Fluid supply equipment and control method thereof |
| CN111810394A (en) * | 2020-05-18 | 2020-10-23 | 格力电器（合肥）有限公司 | Compressor loading control method, system, equipment, storage medium and electronic equipment |
-
1998
- 1998-05-06 JP JP12258398A patent/JP3470042B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109209884A (en) * | 2018-10-24 | 2019-01-15 | 佛山科学技术学院 | A kind of control method of air compressor gas valve |
| CN109209884B (en) * | 2018-10-24 | 2020-04-07 | 佛山科学技术学院 | Control method of air compressor air inlet valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11324963A (en) | 1999-11-26 |
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