JP6220303B2 - Compression device and control method of compression device - Google Patents

Compression device and control method of compression device Download PDF

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JP6220303B2
JP6220303B2 JP2014065797A JP2014065797A JP6220303B2 JP 6220303 B2 JP6220303 B2 JP 6220303B2 JP 2014065797 A JP2014065797 A JP 2014065797A JP 2014065797 A JP2014065797 A JP 2014065797A JP 6220303 B2 JP6220303 B2 JP 6220303B2
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JP2015190322A (en
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和行 依田
和行 依田
海 中西
海 中西
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Kobe Steel Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity

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Description

本発明は、複数台の圧縮機を起動または停止させる圧縮装置および圧縮装置の制御方法に関する。   The present invention relates to a compression device for starting or stopping a plurality of compressors and a control method for the compression device.

複数の圧縮機を順に起動または停止させる圧縮装置の制御装置は、各圧縮機から吐出された圧縮空気を貯留するタンクの圧力を監視する。そして制御装置は、タンクの圧力が上限圧力を超えると供給過剰と判断して１台の圧縮機を停止させる。一方、タンクの圧力が下限圧力未満となる運転状態は、供給側が必要とする最低圧力を下回る恐れがあるため好ましくない。従って、下限圧力を下回ると、制御装置は供給不足と判断し１台の圧縮機を起動させる。   A control device of a compression device that starts or stops a plurality of compressors in order monitors the pressure of a tank that stores compressed air discharged from each compressor. When the tank pressure exceeds the upper limit pressure, the control device determines that supply is excessive and stops one compressor. On the other hand, an operation state in which the tank pressure is lower than the lower limit pressure is not preferable because there is a possibility that the tank may be lower than the minimum pressure required on the supply side. Therefore, if the pressure falls below the lower limit pressure, the control device determines that the supply is insufficient and starts one compressor.

このような圧縮装置の制御装置として例えば、特許文献１には、タンク内の圧力が下限圧力Ｐminに到達するまでの時間ｔd、および上限圧力Ｐmaxに到達するまでの時間ｔuを演算して、圧縮機の運転台数を増減させる制御装置が記載されている。この制御装置は、時間ｔｄが短くなれば圧縮機の運転台数を増やし、時間ｔｕが短くなれば圧縮機の運転台数を減らすことで、タンク内の圧力を所定の範囲内に抑えている。   As a control device for such a compression device, for example, Patent Document 1 calculates a time td until the pressure in the tank reaches the lower limit pressure Pmin and a time tu until the pressure reaches the upper limit pressure Pmax. A control device for increasing or decreasing the number of operating machines is described. This control device keeps the pressure in the tank within a predetermined range by increasing the number of operating compressors when the time td is shortened and decreasing the number of operating compressors when the time tu is shortened.

しかし、特許文献１の制御装置による制御は、予め決められたサンプリング周期毎に行われる。従って、サンプリング周期が長く設定された場合には、適切なタイミングで圧縮機の停止および起動の制御を行うことができない。   However, the control by the control device of Patent Document 1 is performed at predetermined sampling periods. Therefore, when the sampling period is set to be long, it is not possible to control the stop and start of the compressor at an appropriate timing.

特開２００７−１２０４９７号公報JP 2007-120497 A

本発明は、適切なタイミングで圧縮機を追起動できる圧縮装置および圧縮装置の制御方法を提供する。   The present invention provides a compression apparatus and a control method for the compression apparatus that can additionally start the compressor at an appropriate timing.

本発明の第１の態様に係る圧縮装置は、
ガスを圧縮して吐出する複数の圧縮機と、
前記複数の圧縮機から吐出され集められた圧縮ガスを貯留するタンクと、
前記タンク内の圧力を検出する圧力検出手段と、
前記圧縮機のうち少なくとも１台の圧縮機を停止したときに、停止してからの時間を計測する計時手段と、
前記少なくとも１台の圧縮機を停止し前記タンク内の圧力が下限圧力未満になったとき、前記圧力検出手段により検出された圧力の変化に応じて、前記少なくとも１台の圧縮機を停止してから、停止中の圧縮機の中で所望の圧縮機を追起動させる追起動間隔時間を演算し、かつ前記計時手段により計測された時間が、演算された前記追起動間隔時間を経過すると前記所望の圧縮機を追起動させる制御手段と、
を備え、
前記制御手段は、前記圧力の変化が負の変化であるとき、前記追起動間隔時間を前記追起動間隔時間の現在の設定値よりも短くし、前記圧力の変化が正の変化であるとき、前記追起動間隔時間を前記追起動間隔時間の前記現在の設定値よりも長くする。
The compression device according to the first aspect of the present invention is:
A plurality of compressors that compress and discharge gas;
A tank for storing compressed gas discharged and collected from the plurality of compressors;
Pressure detecting means for detecting the pressure in the tank;
When at least one compressor among the compressors is stopped, time measuring means for measuring the time since the stop,
When the at least one compressor is stopped and the pressure in the tank becomes less than the lower limit pressure, the at least one compressor is stopped in accordance with a change in pressure detected by the pressure detecting means. From the compressors that are stopped, a desired starting interval is calculated for further starting, and when the time measured by the time measuring means exceeds the calculated additional starting interval, the desired time Control means for additionally starting the compressor of
Equipped with a,
When the pressure change is a negative change, the control means makes the follow-up interval time shorter than a current set value of the follow-up interval time, and when the pressure change is a positive change, The additional activation interval time is set longer than the current set value of the additional activation interval time .

ここで追起動とは、少なくとも１台の圧縮機の運転を停止し、タンク内の圧力が下限圧力未満の状態になると所望の時間経過後に停止中の圧縮機を起動させることである。また、追起動間隔時間とは、少なくとも１台の圧縮機を停止してから次に所望の圧縮機を起動させるまでの間の時間のことである。   Here, the additional activation is to stop the operation of at least one compressor and activate the stopped compressor after a desired time has elapsed when the pressure in the tank becomes less than the lower limit pressure. Further, the follow-up interval time is a time period from when at least one compressor is stopped until the next desired compressor is started.

タンク内の圧力が下限圧力未満となる状態において、演算された追起動間隔時間に基づき圧縮機を追起動させるので、タンク内の圧力変化に応じて適切なタイミングで圧縮機を追起動できる。   In the state where the pressure in the tank is less than the lower limit pressure, the compressor is further started based on the calculated subsequent start interval time, so that the compressor can be started at an appropriate timing according to the pressure change in the tank.

前記制御手段は、前記圧力の変化が負の変化であるとき、前記追起動間隔時間を短くすることが好ましい。   Preferably, the control means shortens the follow-up activation time when the pressure change is a negative change.

追起動間隔時間を短くすることで圧縮機が追起動するタイミングを早くし、タンク内の圧力が下限圧力未満となる状態での運転を短縮できる。   By shortening the follow-up interval time, the timing at which the compressor is additionally started can be accelerated, and the operation in a state where the pressure in the tank becomes less than the lower limit pressure can be shortened.

前記制御手段は、前記圧力の変化が正の変化であるとき、前記追起動間隔時間を長くすることが好ましい。   Preferably, the control means lengthens the follow-up activation time when the pressure change is a positive change.

追起動間隔時間を長くすることで圧縮機が追起動するタイミングを遅くし、圧縮機の頻繁な追起動を防止して消費電力を抑制できる。   By increasing the follow-up interval time, the timing at which the compressor is further started can be delayed, and frequent follow-up of the compressor can be prevented to reduce power consumption.

本発明の第２の態様に係る圧縮装置の制御方法は、
ガスを圧縮して吐出する複数の圧縮機と、
前記複数の圧縮機から吐出され集められた圧縮ガスを貯留するタンクと、
前記タンク内の圧力を検出する圧力検出手段と、
前記圧縮機のうち少なくとも１台の圧縮機を停止したときに、停止してからの時間を計測する計時手段と、
を備えた圧縮装置の制御方法であって、
前記少なくとも１台の圧縮機を停止し前記タンク内の圧力が下限圧力未満になったとき、前記圧力検出手段により検出された圧力の変化に応じて、前記少なくとも１台の圧縮機を停止してから停止中の圧縮機の中で所望の圧縮機を追起動させる追起動間隔時間を演算し、この演算は、前記圧力の変化が負の変化であるとき、前記追起動間隔時間を前記追起動間隔時間の現在の設定値よりも短くし、前記圧力の変化が正の変化であるとき、前記追起動間隔時間を前記追起動間隔時間の前記現在の設定値よりも長くするものであり、
前記計時手段により計測された時間が、演算された前記追起動間隔時間を経過すると前記所望の圧縮機を追起動させる。
 The control method of the compression device according to the second aspect of the present invention includes:
A plurality of compressors that compress and discharge gas;
A tank for storing compressed gas discharged and collected from the plurality of compressors;
Pressure detecting means for detecting the pressure in the tank;
When at least one compressor among the compressors is stopped, time measuring means for measuring the time since the stop,
A method for controlling a compression device comprising:
When the at least one compressor is stopped and the pressure in the tank becomes less than the lower limit pressure, the at least one compressor is stopped in accordance with a change in pressure detected by the pressure detecting means. To calculate a follow-up interval time for further starting a desired compressor among the stopped compressors, and when the change in the pressure is a negative change , this calculation calculates the follow-up interval time. Shorter than the current set value of the interval time, and when the change in pressure is a positive change, to make the follow-up interval time longer than the current set value of the follow-up interval time,
When the time measured by the time measuring unit exceeds the calculated follow-up interval time, the desired compressor is additionally started.

演算された追起動間隔時間に基づいて圧縮機を追起動させるので、タンク内の圧力変化に応じて適切なタイミングで圧縮機を追起動できる。負の圧力変化が生じて追起動間隔時間が短くなる場合には、圧縮機が追起動するタイミングを早くし、タンク内の圧力が下限圧力未満となる状態での運転を短縮できる。正の圧力変化が生じて追起動間隔時間が長くなる場合には、圧縮機が追起動するタイミングを遅くし、圧縮機の頻繁な追起動を防止して消費電力を抑制できる。   Since the compressor is additionally started based on the calculated additional start interval time, the compressor can be additionally started at an appropriate timing according to the pressure change in the tank. When a negative pressure change occurs and the follow-up interval time is shortened, the timing for the follow-up of the compressor can be advanced, and the operation in a state where the pressure in the tank is less than the lower limit pressure can be shortened. When a positive pressure change occurs and the follow-up interval time becomes long, the timing of the follow-up of the compressor can be delayed to prevent frequent follow-up of the compressor and reduce power consumption.

本発明の圧縮装置および圧縮装置の制御方法によれば、タンク内の圧力が下限圧力未満となる状態において、演算された追起動間隔時間に基づきタンク内の圧力変化に応じて適切なタイミングで圧縮機を追起動できる。特に、追起動間隔時間を短くすることで圧縮機が追起動するタイミングを早くし、タンク内の圧力が下限圧力未満となる状態での運転を短縮できる。   According to the compression device and the control method for the compression device of the present invention, in a state where the pressure in the tank is less than the lower limit pressure, the compression is performed at an appropriate timing according to the pressure change in the tank based on the calculated follow-up interval time. You can start the machine. In particular, by shortening the follow-up interval time, the timing at which the compressor is additionally started can be accelerated, and the operation in a state where the pressure in the tank is less than the lower limit pressure can be shortened.

本発明の実施形態に係る圧縮装置の概略構成を示すブロック図。The block diagram which shows schematic structure of the compression apparatus which concerns on embodiment of this invention. 本発明の実施形態に係る圧縮機を追起動する処理手順を説明するためのフローチャート。The flowchart for demonstrating the process sequence which starts the compressor which concerns on embodiment of this invention. タンク内の圧力、および各圧縮機の運転または停止の時間変化を示す特性線図。The characteristic diagram which shows the pressure in a tank, and the time change of the driving | operation or stop of each compressor.

以下、本発明の実施形態を添付図面に従って説明する。   Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

図１に示すように、本実施形態の圧縮装置１は、ガスを圧縮して吐出する３台の圧縮機１０Ａ〜１０Ｃ（１号機１０Ａ〜３号機１０Ｃ）と、３台の圧縮機１０Ａ〜１０Ｃから吐出され集められた圧縮ガスを貯留するタンク１４とを備えている。停止中の圧縮機１０Ａ〜１０Ｃは１号機１０Ａ、２号機１０Ｂ、３号機１０Ｃの順に起動され、運転中の圧縮機１０Ａ〜１０Ｃは１号機１０Ａ、２号機１０Ｂ、３号機１０Ｃの順に停止される。タンク１４には、タンク１４内の圧縮ガスを図示しないガス供給先に供給するバルブ１５と、タンク１４内の圧力を測定する圧力測定手段（圧力センサ）１６とが接続されている。   As shown in FIG. 1, the compression device 1 of the present embodiment includes three compressors 10A to 10C (No. 1 machine 10A to No. 3 machine 10C) that compress and discharge gas, and three compressors 10A to 10C. And a tank 14 for storing the compressed gas discharged and collected. The stopped compressors 10A to 10C are started in the order of No. 1 machine 10A, No. 2 machine 10B, and No. 3 machine 10C, and the operating compressors 10A to 10C are stopped in the order of No. 1 machine 10A, No. 2 machine 10B, and No. 3 machine 10C. . Connected to the tank 14 are a valve 15 for supplying the compressed gas in the tank 14 to a gas supply destination (not shown), and a pressure measuring means (pressure sensor) 16 for measuring the pressure in the tank 14.

圧縮機１０Ａ〜１０Ｃと圧力センサ１６との間には、制御手段（制御装置）２０と、制御装置２０を介して計時手段（タイマ）２１とが接続されている。制御装置２０は、少なくとも１台の圧縮機１０Ａ〜１０Ｃの運転を停止しタンク１４内の圧力が下限圧力未満になったとき、圧力センサ１６により検出されたタンク１４内の圧力変化に応じて、停止してから圧縮機を追起動させる追起動間隔時間を演算する。制御装置２０はまた、タイマ２１により計測された時間が、演算された前記追起動間隔時間を経過すると圧縮機を追起動させる。タイマ２１は、運転中の圧縮機のうち少なくとも１台を停止したときに、停止してからの時間を計測する。   Between the compressors 10 </ b> A to 10 </ b> C and the pressure sensor 16, a control means (control device) 20 and a time measuring means (timer) 21 are connected via the control device 20. The control device 20 stops the operation of at least one of the compressors 10A to 10C, and when the pressure in the tank 14 becomes less than the lower limit pressure, according to the pressure change in the tank 14 detected by the pressure sensor 16, A follow-up interval time for further starting the compressor after the stop is calculated. The control device 20 also causes the compressor to be additionally activated when the time measured by the timer 21 exceeds the calculated additional activation interval time. The timer 21 measures the time after stopping when at least one of the operating compressors is stopped.

次に、タンク１４内の圧力に応じて圧縮機１０Ａ〜１０Ｃを運転または停止させる制御方法について説明する。   Next, a control method for operating or stopping the compressors 10A to 10C according to the pressure in the tank 14 will be described.

全ての圧縮機１０Ａ〜１０Ｃが運転している状態で、タンク１４内の圧力が上限圧力を超えたＡ点（図３参照）で１号機１０Ａの運転を停止させる。このとき図２に示すフローチャートのように、タイマ２１により、運転を停止してからの経過時間の計測をスタートする。ステップＳ１１において制御装置２０は、タイマ２１により計測された経過時間が、予め決められた追起動間隔時間Ｔinを経過したか否かを判断する。経過していればステップＳ１１Ａに進み、制御装置２０は、圧力センサ１６により測定されたタンク１４内の圧力が下限圧力未満であるか否かを判断する。下限圧力未満の状態とは、図３におけるＢ１からＢ３およびＣ１からＣ３の各領域における圧力状態である。タンク１４内の圧力が下限圧力未満でなければステップＳ１１に戻る。下限圧力未満であれば、１号機１０Ａを追起動させる。一方、ステップＳ１１において、追起動間隔時間Ｔinが経過していなければ、ステップＳ１２に進む。   While all the compressors 10A to 10C are operating, the operation of the first machine 10A is stopped at a point A (see FIG. 3) where the pressure in the tank 14 exceeds the upper limit pressure. At this time, as shown in the flowchart of FIG. 2, the timer 21 starts measuring the elapsed time after stopping the operation. In step S <b> 11, the control device 20 determines whether or not the elapsed time measured by the timer 21 has passed a predetermined follow-up interval time Tin. If it has elapsed, the process proceeds to step S11A, and the control device 20 determines whether or not the pressure in the tank 14 measured by the pressure sensor 16 is less than the lower limit pressure. The state below the lower limit pressure is a pressure state in each of the regions B1 to B3 and C1 to C3 in FIG. If the pressure in the tank 14 is not less than the lower limit pressure, the process returns to step S11. If it is less than the lower limit pressure, the first machine 10A is additionally started. On the other hand, if the additional activation interval time Tin has not elapsed in step S11, the process proceeds to step S12.

ステップＳ１２において制御装置２０は、圧力センサ１６により測定されたタンク１４内の圧力が下限圧力未満であるか否かを判断する。タンク１４内の圧力が下限圧力未満でなければステップＳ１１に戻る。下限圧力未満であれば、ステップＳ１３に進む。   In step S <b> 12, the control device 20 determines whether or not the pressure in the tank 14 measured by the pressure sensor 16 is less than the lower limit pressure. If the pressure in the tank 14 is not less than the lower limit pressure, the process returns to step S11. If it is less than the lower limit pressure, the process proceeds to step S13.

ステップＳ１３において制御装置２０は、タイマ２１により計測された経過時間が、その時設定されている追起動間隔時間（現在の設定値）を経過したか否かを判断する。経過していれば１号機１０Ａを追起動させる。経過していなければ、ステップＳ１４に進む。なお、ステップＳ１３では、追起動間隔時間の設定値が予め決められた追起動間隔時間Ｔin（初期値）から更新されるまでは、追起動間隔時間Ｔin（初期値）を判断に用いる。初期値から更新されて以降、その時設定されている追起動間隔時間（現在の設定値）を経過時間が経過するまでは、後述する追起動間隔時間の演算の都度、ステップＳ１３での判断に用いる追起動間隔時間の設定値を更新する。   In step S13, the control device 20 determines whether or not the elapsed time measured by the timer 21 has passed the follow-up activation interval time (current set value) set at that time. If it has elapsed, the first machine 10A is additionally activated. If not, the process proceeds to step S14. In step S13, the additional activation interval time Tin (initial value) is used for determination until the set value of the additional activation interval time is updated from the predetermined additional activation interval time Tin (initial value). After the update from the initial value, the subsequent startup interval time (current set value) set at that time is used for determination in step S13 every time the additional startup interval time described later is calculated until the elapsed time has elapsed. Update the set value of the follow-up interval time.

ステップＳ１４では制御装置２０が、以下の数１の式に示すように、現在の圧力Ｐ（ｔ）と前回の圧力Ｐ（ｔ−１）との差を単位時間ΔＴで割った圧力変化量ΔＰを演算する。
＜数１＞
ΔＰ＝（Ｐ（ｔ）−Ｐ（ｔ−１））/ΔＴ In step S14, as shown in the following equation (1), the control device 20 changes the pressure change amount ΔP obtained by dividing the difference between the current pressure P (t) and the previous pressure P (t−1) by the unit time ΔT. Is calculated.
<Equation 1>
ΔP = (P (t) −P (t−1)) / ΔT

この後、ステップＳ１５に進み、制御装置２０が圧力変化量ΔＰは０よりも小さいか否かを判断する。圧力変化量ΔＰが０よりも小さい状態とは、圧力が低下するよう変化し負の圧力変化が生じて、図３のＢ１，Ｂ２およびＢ３の各領域のようにグラフＧの傾きがマイナスになることである。圧力変化量ΔＰが０よりも小さければステップＳ１６に進む。ステップＳ１６では制御装置２０が、次のフローで使用する追起動間隔時間を、その時設定されている追起動間隔時間から定数αを引いた値に変更する。このように、制御装置２０において追起動間隔時間を演算し、その設定値を更新する。そしてステップＳ１２に戻る。   Thereafter, the process proceeds to step S15, and the control device 20 determines whether or not the pressure change amount ΔP is smaller than zero. The state in which the pressure change amount ΔP is smaller than 0 means that the pressure changes so as to decrease, and a negative pressure change occurs, and the slope of the graph G becomes negative as in each of the areas B1, B2, and B3 in FIG. That is. If the pressure change amount ΔP is smaller than 0, the process proceeds to step S16. In step S16, the control device 20 changes the follow-up interval time used in the next flow to a value obtained by subtracting the constant α from the follow-up interval time set at that time. In this manner, the control device 20 calculates the follow-up activation time and updates the set value. Then, the process returns to step S12.

ステップＳ１５で圧力変化量ΔＰが０よりも小さくなければ、ステップＳ１７に進む。圧力変化量ΔＰが０よりも小さくない状態とは、圧力が上昇するよう変化し正の圧力変化が生じて、図３のＣ１，Ｃ２およびＣ３の各領域のようにグラフＧの傾きがプラスになることである。ステップＳ１７では制御装置２０が、次のフローで使用する追起動間隔時間を、その時設定されている追起動間隔時間に定数αを足した値に変更する。このように、制御装置２０において追起動間隔時間を演算し、その設定値を更新する。そしてステップＳ１２に戻る。   If the pressure change amount ΔP is not smaller than 0 in step S15, the process proceeds to step S17. The state in which the pressure change amount ΔP is not smaller than 0 means that the pressure increases so that a positive pressure change occurs, and the slope of the graph G becomes positive as in the areas C1, C2, and C3 in FIG. It is to become. In step S17, the control device 20 changes the follow-up interval time used in the next flow to a value obtained by adding the constant α to the follow-up interval time set at that time. In this manner, the control device 20 calculates the follow-up activation time and updates the set value. Then, the process returns to step S12.

ステップＳ１６からステップＳ１２に戻り、タンク１４内の圧力が下限圧力未満であればステップＳ１３に進む。このとき、ステップＳ１３で用いる追起動間隔時間は、ステップＳ１２に戻る前のフローのステップＳ１６で変更され短くされた追起動間隔時間となる。そして、タイマ２１により計測された経過時間が、短くされた追起動間隔時間を経過したか否かを判断し、経過していれば１号機１０Ａを追起動させる。   Returning from step S16 to step S12, if the pressure in the tank 14 is less than the lower limit pressure, the process proceeds to step S13. At this time, the follow-up interval time used in step S13 is the follow-up interval time changed and shortened in step S16 of the flow before returning to step S12. And it is judged whether the elapsed time measured by the timer 21 has passed the shortened follow-up interval time, and if it has passed, the first machine 10A is further started.

ステップＳ１７からステップＳ１２に戻り、タンク１４内の圧力が下限圧力未満であればステップＳ１３に進む。このとき、ステップＳ１３で用いる追起動間隔時間は、ステップＳ１２に戻る前のフローのステップＳ１７で変更され長くされた追起動間隔時間となる。そして、タイマ２１により計測された経過時間が、長くされた追起動間隔時間を経過したか否かを判断し、経過していれば１号機１０Ａを追起動させる。このように追起動間隔時間を長くすることで、１号機１０Ａが追起動するタイミングを遅くし、圧縮機１０Ａ〜１０Ｃの頻繁な追起動を防止して消費電力を抑制できる。   Returning from step S17 to step S12, if the pressure in the tank 14 is less than the lower limit pressure, the process proceeds to step S13. At this time, the follow-up interval time used in step S13 is the follow-up interval time changed and lengthened in step S17 of the flow before returning to step S12. Then, it is determined whether or not the elapsed time measured by the timer 21 has passed the extended follow-up interval time, and if it has elapsed, the first machine 10A is further started. As described above, by increasing the follow-up interval time, the timing at which the first machine 10A is further started up can be delayed, and frequent follow-up of the compressors 10A to 10C can be prevented to reduce power consumption.

ステップＳ１３で、タイマ２１により計測された経過時間が、現在の追起動間隔時間（現在の設定値）を経過していなければステップＳ１４およびステップＳ１５に進む。ステップＳ１５で圧力変化量ΔＰが０よりも小さいと判断されればステップＳ１６に進む。ステップＳ１６では制御装置２０が、次のフローで使用する追起動間隔時間を、現在の追起動間隔時間から定数αを引いた値に変更する。そしてステップＳ１２に戻り、１号機１０Ａが追起動するまでフローを繰り返す。ステップＳ１５で圧力変化量ΔＰが０よりも小さくないと判断されればステップＳ１７に進む。ステップＳ１７では制御装置２０が、次のフローで使用する追起動間隔時間を、現在の追起動間隔時間から定数αを足した値に変更する。そしてステップＳ１２に戻り、１号機１０Ａが追起動するまでフローを繰り返す。   If the elapsed time measured by the timer 21 does not exceed the current follow-up interval time (current set value) in step S13, the process proceeds to step S14 and step S15. If it is determined in step S15 that the pressure change amount ΔP is smaller than 0, the process proceeds to step S16. In step S16, the control device 20 changes the follow-up interval time used in the next flow to a value obtained by subtracting the constant α from the current follow-up interval time. Then, the process returns to step S12 and the flow is repeated until the first car 10A is additionally started. If it is determined in step S15 that the pressure change amount ΔP is not smaller than 0, the process proceeds to step S17. In step S17, the control device 20 changes the follow-up activation time used in the next flow to a value obtained by adding the constant α to the current follow-up activation time. Then, the process returns to step S12 and the flow is repeated until the first car 10A is additionally started.

上述のフローを繰り返し、例えば図３のＤ点で１号機１０Ａを追起動させると、グラフＧ１で示すように、タンク１４内の圧力が上昇しＥ点で下限圧力を上回る。なお、グラフＧ２は、従来の圧縮機の追起動制御による圧力変化を示す。従来の追起動制御では、タンク１４内の圧力変化に応じて追起動間隔時間を短くすることはなく、予め決められたＦ点で圧縮機を追起動させる。これに対し本願発明では、タンク１４内の圧力変化に応じて追起動間隔時間を短くする。これにより、１号機１０Ａが追起動するタイミングを早くし、タンク１４内の圧力が下限圧力未満となる状態での運転時間を短縮できる。   When the above-described flow is repeated and, for example, the first unit 10A is additionally started at point D in FIG. 3, the pressure in the tank 14 rises and exceeds the lower limit pressure at point E, as shown by the graph G1. The graph G2 shows the pressure change due to the follow-up control of the conventional compressor. In the conventional follow-up control, the follow-up interval time is not shortened according to the pressure change in the tank 14 and the compressor is additionally started at a predetermined F point. On the other hand, in the present invention, the follow-up activation time is shortened according to the pressure change in the tank 14. Thereby, the timing at which the No. 1 machine 10A is additionally started can be advanced, and the operation time in a state where the pressure in the tank 14 is less than the lower limit pressure can be shortened.

以上のように、タンク１４内の圧力が下限圧力未満となる状態において、演算された追起動間隔時間に基づき１号機１０Ａを追起動させるので、タンク１４内の圧力変化に応じて適切なタイミングで１号機１０Ａを追起動できる。   As described above, in the state where the pressure in the tank 14 is less than the lower limit pressure, the No. 1 machine 10A is additionally started based on the calculated additional start interval time, so at an appropriate timing according to the pressure change in the tank 14. The first machine 10A can be additionally started.

なお本発明は前記実施形態に限定されず、種々の変形が可能である。   In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible.

前記実施形態では３台の圧縮機が運転している状態から１号機１０Ａを停止させた後、１号機１０Ａを追起動するための追起動間隔時間を演算している。しかし、運転中の圧縮機の停止および停止後の圧縮機の追起動に関しては、圧縮機１０Ａ〜１０Ｃの運転頻度が偏るのを防止するために１号機１０Ａ→２号機１０Ｂ→３号機１０Ｃの順番に従うのであれば特に限定されない。   In the embodiment, after the first unit 10A is stopped from the state where the three compressors are operating, the follow-up interval time for further starting the first unit 10A is calculated. However, regarding the stop of the compressor during operation and the subsequent start of the compressor after the stop, the order of the first machine 10A → the second machine 10B → the third machine 10C in order to prevent the operation frequency of the compressors 10A to 10C from being biased. If it follows, it will not specifically limit.

例えば３台の圧縮機１０Ａ〜１０Ｃが停止した状態から、１号機１０Ａのみを起動する。この後、１号機１０Ａを停止し、次に２号機１０Ｂを追起動するための追起動間隔時間を演算しても前記実施形態と同様の作用および効果を得ることができる。また３台の圧縮機１０Ａ〜１０Ｃが停止した状態から、１号機１０Ａおよび２号機１０Ｂを順に起動する。この後、１号機１０Ａを停止し、次に３号機１０Ｃを追起動するための追起動間隔時間を演算してもよい。更に３台の圧縮機１０Ａ〜１０Ｃが停止した状態から、１号機１０Ａ、２号機１０Ｂおよび３号機１０Ｃを順に起動する。この後、１号機１０Ａおよび２号機１０Ｂを停止し、次に１号機１０Ａおよび２号機を追起動するための追起動間隔時間を演算してもよい。   For example, only the first machine 10A is started from a state where the three compressors 10A to 10C are stopped. After that, even if the No. 1 machine 10A is stopped and the subsequent startup interval time for the subsequent startup of the No. 2 machine 10B is calculated, the same operation and effect as in the above embodiment can be obtained. In addition, from the state where the three compressors 10A to 10C are stopped, the first machine 10A and the second machine 10B are sequentially activated. Thereafter, the No. 1 machine 10A may be stopped, and then the follow-up interval time for further starting the No. 3 machine 10C may be calculated. Further, from the state where the three compressors 10A to 10C are stopped, the first machine 10A, the second machine 10B, and the third machine 10C are sequentially activated. Thereafter, the No. 1 machine 10A and the No. 2 machine 10B may be stopped, and the follow-up interval time for the subsequent start-up of the No. 1 machine 10A and the No. 2 machine may be calculated.

前記実施形態ではαを定数にしたが、αは例えばΔＰの一次関数など、α＝ｆ（ΔＰ）が成立するΔＰの関数であってもよい。 In the above embodiment, α is a constant, but α may be a function of ΔP that satisfies α = f (ΔP) , such as a linear function of ΔP .

１ 圧縮装置
１０Ａ １号機（圧縮機）
１０Ｂ ２号機（圧縮機）
１０Ｃ ３号機（圧縮機）
１４ タンク
１６ 圧力測定手段（圧力センサ）
２０ 制御手段（制御装置）
２１ 計時手段（タイマ） 1 Compressor 10A Unit 1 (Compressor)
10B Unit 2 (Compressor)
10C Unit 3 (Compressor)
14 Tank 16 Pressure measuring means (pressure sensor)
20 Control means (control device)
21 Timekeeping means (timer)

Claims (2)

ガスを圧縮して吐出する複数の圧縮機と、
前記複数の圧縮機から吐出され集められた圧縮ガスを貯留するタンクと、
前記タンク内の圧力を検出する圧力検出手段と、
前記圧縮機のうち少なくとも１台の圧縮機を停止したときに、停止してからの時間を計測する計時手段と、
前記少なくとも１台の圧縮機を停止し前記タンク内の圧力が下限圧力未満になったとき、前記圧力検出手段により検出された圧力の変化に応じて、前記少なくとも１台の圧縮機を停止してから、停止中の圧縮機の中で所望の圧縮機を追起動させる追起動間隔時間を演算し、かつ前記計時手段により計測された時間が、演算された前記追起動間隔時間を経過すると前記所望の圧縮機を追起動させる制御手段と、
を備え、
前記制御手段は、前記圧力の変化が負の変化であるとき、前記追起動間隔時間を前記追起動間隔時間の現在の設定値よりも短くし、前記圧力の変化が正の変化であるとき、前記追起動間隔時間を前記追起動間隔時間の前記現在の設定値よりも長くする、圧縮装置。 A plurality of compressors that compress and discharge gas;
A tank for storing compressed gas discharged and collected from the plurality of compressors;
Pressure detecting means for detecting the pressure in the tank;
When at least one compressor among the compressors is stopped, time measuring means for measuring the time since the stop,
When the at least one compressor is stopped and the pressure in the tank becomes less than the lower limit pressure, the at least one compressor is stopped in accordance with a change in pressure detected by the pressure detecting means. From the compressors that are stopped, a desired starting interval is calculated for further starting, and when the time measured by the time measuring means exceeds the calculated additional starting interval, the desired time Control means for additionally starting the compressor of
Equipped with a,
When the pressure change is a negative change, the control means makes the follow-up interval time shorter than a current set value of the follow-up interval time, and when the pressure change is a positive change, The compression device that makes the follow-up activation time longer than the current set value of the follow-up activation time . ガスを圧縮して吐出する複数の圧縮機と、
前記複数の圧縮機から吐出され集められた圧縮ガスを貯留するタンクと、
前記タンク内の圧力を検出する圧力検出手段と、
前記圧縮機のうち少なくとも１台の圧縮機を停止したときに、停止してからの時間を計測する計時手段と、
を備えた圧縮装置の制御方法であって、
前記少なくとも１台の圧縮機を停止し前記タンク内の圧力が下限圧力未満になったとき、前記圧力検出手段により検出された圧力の変化に応じて、前記少なくとも１台の圧縮機を停止してから停止中の圧縮機の中で所望の圧縮機を追起動させる追起動間隔時間を演算し、この演算は、前記圧力の変化が負の変化であるとき、前記追起動間隔時間を前記追起動間隔時間の現在の設定値よりも短くし、前記圧力の変化が正の変化であるとき、前記追起動間隔時間を前記追起動間隔時間の前記現在の設定値よりも長くするものであり、
前記計時手段により計測された時間が、演算された前記追起動間隔時間を経過すると前記所望の圧縮機を追起動させる、圧縮装置の制御方法。 A plurality of compressors that compress and discharge gas;
A tank for storing compressed gas discharged and collected from the plurality of compressors;
Pressure detecting means for detecting the pressure in the tank;
When at least one compressor among the compressors is stopped, time measuring means for measuring the time since the stop,
A method for controlling a compression device comprising:
When the at least one compressor is stopped and the pressure in the tank becomes less than the lower limit pressure, the at least one compressor is stopped in accordance with a change in pressure detected by the pressure detecting means. To calculate a follow-up interval time for further starting a desired compressor among the stopped compressors, and when the change in the pressure is a negative change , this calculation calculates the follow-up interval time. Shorter than the current set value of the interval time, and when the change in pressure is a positive change, to make the follow-up interval time longer than the current set value of the follow-up interval time,
A control method for a compression device, wherein the desired compressor is further started when the time measured by the time measuring unit has passed the calculated subsequent start interval time.
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