JP6491982B2 - Two-stage screw compressor and operating method thereof - Google Patents

Two-stage screw compressor and operating method thereof Download PDF

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JP6491982B2
JP6491982B2 JP2015169409A JP2015169409A JP6491982B2 JP 6491982 B2 JP6491982 B2 JP 6491982B2 JP 2015169409 A JP2015169409 A JP 2015169409A JP 2015169409 A JP2015169409 A JP 2015169409A JP 6491982 B2 JP6491982 B2 JP 6491982B2
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stage
rotation speed
rotational speed
inverter
power consumption
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JP2017044195A (en
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昇 壷井
昇 壷井
中村　元
中村　　元
濱田　克徳
克徳 濱田
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Kobe Steel Ltd
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Kobe Steel Ltd
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Priority to PCT/JP2016/071906 priority patent/WO2017038308A1/en
Priority to CN201680050487.1A priority patent/CN107923402B/en
Priority to TW105125310A priority patent/TWI631282B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/02—Pumps characterised by combination with or adaptation to specific driving engines or motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/08—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
    • H02P5/46—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another
    • H02P5/50—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another by comparing electrical values representing the speeds

Description

本発明は、２段型スクリュ圧縮機およびその運転方法に関する。   The present invention relates to a two-stage screw compressor and an operation method thereof.

作動流体を圧縮する際、２段階に分けて圧縮することで高圧圧縮可能な２段型圧縮機が知られている。２段型圧縮機の中でも特にスクリュタイプは、回転数を変更できることから幅広い用途で使用されている。   2. Description of the Related Art There is known a two-stage compressor that can compress a working fluid in two stages and compress it at high pressure. Among the two-stage compressors, the screw type is used in a wide range of applications because the rotation speed can be changed.

特許文献１には、１段目回転数と２段目回転数を変更することで１段目と２段目の圧縮間の圧力である中間圧力を許容圧力範囲内に調整する２段型スクリュ圧縮機が開示されている。   Patent Document 1 discloses a two-stage screw that adjusts the intermediate pressure, which is the pressure between the first and second stages of compression, within an allowable pressure range by changing the first stage and the second stage. A compressor is disclosed.

特開平７−１５８５７６号公報JP 7-158576 A

特許文献１の２段型スクリュ圧縮機は、中間圧力を制御することについて考慮されているものの、１段目及び２段目の圧縮による総消費電力を最小化することについては考慮されていない。   Although the two-stage screw compressor of Patent Document 1 is considered for controlling the intermediate pressure, it is not considered for minimizing the total power consumption by the first-stage and second-stage compression.

本発明は、２段型スクリュ圧縮機において、要求圧力を実現すると共に、総消費電力を最小化することを課題とする。   An object of the present invention is to achieve a required pressure and to minimize the total power consumption in a two-stage screw compressor.

本発明の第１の態様は、第１インバータで回転数を変更可能である第１電動機により駆動される１段目圧縮機本体と、第２インバータで回転数を変更可能である第２電動機により駆動され、前記１段目圧縮機本体の下流側に直列に接続された２段目圧縮機本体と、要求圧力に応じて１段目回転数を決定する１段目回転数決定部と、前記１段目回転数決定部により決定された前記１段目回転数となるように前記第１インバータを制御する第１インバータ制御部と、２段目回転数のうち前記第１電動機および前記第２電動機の総消費電力を最小化する最適２段目回転数を決定する２段目回転数決定部と、前記最適２段目回転数となるように前記第２インバータを制御する第２インバータ制御部とを有する制御装置とを備える、２段型スクリュ圧縮機を提供する。   According to a first aspect of the present invention, there is provided a first-stage compressor body driven by a first motor whose rotation speed can be changed by a first inverter, and a second motor whose rotation speed can be changed by a second inverter. A second-stage compressor body that is driven and connected in series to the downstream side of the first-stage compressor body; a first-stage rotation speed determination unit that determines a first-stage rotation speed according to a required pressure; A first inverter control unit that controls the first inverter so as to be the first-stage rotation speed determined by the first-stage rotation speed determination unit; and the first motor and the second of the second-stage rotation speeds A second-stage rotational speed determination unit that determines an optimal second-stage rotational speed that minimizes the total power consumption of the electric motor; and a second inverter control unit that controls the second inverter so as to achieve the optimal second-stage rotational speed And a two-stage screw compression To provide.

この構成によれば、２段型スクリュ圧縮機において、１段目回転数を調整することにより要求圧力を実現すると共に、２段目回転数を調整することにより総消費電力を最小化できる。ここで、１段目回転数は第１電動機の回転数であり、２段目回転数は第２電動機の回転数である。また、総消費電力は、１段目圧縮機本体及び２段目圧縮機本体の両方によって消費される電力の和を表す。   According to this configuration, in the two-stage screw compressor, the required pressure can be realized by adjusting the first-stage rotation speed, and the total power consumption can be minimized by adjusting the second-stage rotation speed. Here, the first stage rotational speed is the rotational speed of the first electric motor, and the second stage rotational speed is the rotational speed of the second electric motor. The total power consumption represents the sum of power consumed by both the first-stage compressor body and the second-stage compressor body.

前記２段目回転数決定部は、所定範囲内で前記２段目回転数を自動的に変化させて個々の前記２段目回転数に対応する前記総消費電力を検出し、前記最適２段目回転数を探索してもよい。   The second-stage rotation speed determination unit automatically changes the second-stage rotation speed within a predetermined range to detect the total power consumption corresponding to each of the second-stage rotation speeds, and The eye rotation speed may be searched.

この構成によれば、総消費電力を最小化する最適２段目回転数の探索を自動的に行うことができる。また、所定範囲内で２段目回転数を実際に変更して総消費電力を検出するため、総消費電力を最小化する最適２段目回転数を確実に探索できる。   According to this configuration, it is possible to automatically search for the optimum second stage rotation speed that minimizes the total power consumption. In addition, since the total power consumption is detected by actually changing the second-stage rotation speed within a predetermined range, the optimum second-stage rotation speed that minimizes the total power consumption can be reliably searched.

前記２段目回転数決定部は、前記１段目回転数に対して予め記憶した前記最適２段目回転数を採用してもよい。   The second-stage rotation speed determination unit may adopt the optimum second-stage rotation speed stored in advance for the first-stage rotation speed.

この構成によれば、総消費電力を最小化する最適２段目回転数を予め記憶しているため、運転中に探索することなく即時に決定できる。   According to this configuration, since the optimum second stage rotation speed that minimizes the total power consumption is stored in advance, it can be determined immediately without searching during operation.

また、本発明は、第１インバータで回転数を変更可能である第１電動機により駆動される１段目圧縮機本体と、第２インバータで回転数を変更可能である第２電動機により駆動され、前記１段目圧縮機本体の下流側に直列に接続された２段目圧縮機本体と、要求圧力に応じて２段目回転数を決定する２段目回転数決定部と、前記２段目回転数決定部により決定された前記２段目回転数となるように前記第２インバータを制御する第２インバータ制御部と、１段目回転数のうち総消費電力を最小化する最適１段目回転数を決定する１段目回転数決定部と、前記最適１段目回転数となるように前記第１インバータを制御する第２インバータ制御部とを有する制御装置とを備える、２段型スクリュ圧縮機を提供する。   Further, the present invention is driven by a first-stage compressor body driven by a first motor whose rotation speed can be changed by a first inverter, and a second motor whose rotation speed can be changed by a second inverter, A second-stage compressor main body connected in series downstream of the first-stage compressor main body, a second-stage rotation speed determining unit that determines a second-stage rotation speed according to a required pressure, and the second-stage compressor main body A second inverter control unit for controlling the second inverter so as to achieve the second stage rotational speed determined by the rotational speed determination unit, and an optimum first stage for minimizing total power consumption among the first stage rotational speeds A two-stage screw comprising: a first-stage rotation speed determination unit that determines a rotation speed; and a control device that includes a second inverter control unit that controls the first inverter so as to achieve the optimum first-stage rotation speed. Provide a compressor.

この構成によれば、２段型スクリュ圧縮機において、２段目回転数を調整することにより要求圧力を実現すると共に、１段目回転数を調整することにより総消費電力を最小化できる。   According to this configuration, in the two-stage screw compressor, the required pressure is realized by adjusting the second-stage rotation speed, and the total power consumption can be minimized by adjusting the first-stage rotation speed.

前記１段目回転数決定部は、所定範囲内で前記１段目回転数を自動的に変化させて個々の前記１段目回転数に対応する前記総消費電力を検出し、前記最適１段目回転数を探索してもよい。   The first-stage rotational speed determination unit automatically changes the first-stage rotational speed within a predetermined range to detect the total power consumption corresponding to each of the first-stage rotational speeds, and the optimal first-stage rotational speed is determined. The eye rotation speed may be searched.

この構成によれば、総消費電力を最小化する最適１段目回転数の探索を自動的に行うことができる。また、所定範囲内で１段目回転数を実際に変更して総消費電力を検出するため、総消費電力を最小化する最適１段目回転数を確実に探索できる。   According to this configuration, it is possible to automatically search for the optimal first stage rotation speed that minimizes the total power consumption. Further, since the total power consumption is detected by actually changing the first stage rotational speed within a predetermined range, the optimum first stage rotational speed that minimizes the total power consumption can be reliably searched.

前記１段目回転数決定部は、前記２段目回転数に対して予め記憶した前記最適１段目回転数を採用してもよい。   The first stage rotational speed determination unit may adopt the optimal first stage rotational speed stored in advance for the second stage rotational speed.

この構成によれば、総消費電力を最小化する最適１段目回転数を予め記憶しているため、運転中に探索することなく即時に決定できる。   According to this configuration, since the optimal first stage rotation speed that minimizes the total power consumption is stored in advance, it can be determined immediately without searching during operation.

本発明の第２の態様は、第１インバータで回転数を変更可能である第１電動機により駆動される１段目圧縮機本体と、第２インバータで回転数を変更可能である第２電動機により駆動され、前記１段目圧縮機本体の下流側に直列に接続された２段目圧縮機本体と、を設け、要求圧力に応じた２段目回転数を決定し、この２段目回転数となるように前記第２インバータを制御し、１段目回転数のうち前記第１電動機および前記第２電動機の総消費電力を最小化する最適１段目回転数を決定し、この最適１段目回転数となるように前記第１インバータを制御する２段型スクリュ圧縮機の運転方法を提供する。   According to a second aspect of the present invention, there is provided a first-stage compressor body driven by a first motor whose rotation speed can be changed by a first inverter, and a second motor whose rotation speed can be changed by a second inverter. A second-stage compressor body that is driven and connected in series downstream of the first-stage compressor body, and determines a second-stage rotational speed corresponding to the required pressure, and this second-stage rotational speed The second inverter is controlled so that the optimal first stage rotational speed that minimizes the total power consumption of the first motor and the second motor is determined from among the first stage rotational speeds. Provided is a method for operating a two-stage screw compressor that controls the first inverter so as to achieve an eye speed.

また、第１インバータで回転数を変更可能である第１電動機により駆動される１段目圧縮機本体と、第２インバータで回転数を変更可能である第２電動機により駆動され、前記１段目圧縮機本体の下流側に直列に接続された２段目圧縮機本体と、を設け、要求圧力に応じた２段目回転数を決定し、この２段目回転数となるように前記第２インバータを制御し、１段目回転数のうち前記第１電動機および前記第２電動機の総消費電力を最小化する最適１段目回転数を決定し、この最適１段目回転数となるように前記第１インバータを制御する２段型スクリュ圧縮機の運転方法を提供する。   Further, the first-stage compressor body driven by the first motor whose rotation speed can be changed by the first inverter, and the second-stage motor body which can change the rotation speed by the second inverter, the first stage A second-stage compressor body connected in series on the downstream side of the compressor body, and determining a second-stage rotational speed corresponding to the required pressure, and the second-stage rotational speed is set to the second-stage rotational speed. The inverter is controlled to determine an optimum first stage rotational speed that minimizes the total power consumption of the first motor and the second motor among the first stage rotational speeds, so that the optimum first stage rotational speed is obtained. A method of operating a two-stage screw compressor that controls the first inverter is provided.

本発明によれば、２段型スクリュ圧縮機において、１段目回転数を調整することにより要求圧力を実現すると共に、２段目回転数を調整することにより総消費電力を最小化できる。   According to the present invention, in the two-stage screw compressor, the required pressure is realized by adjusting the first-stage rotation speed, and the total power consumption can be minimized by adjusting the second-stage rotation speed.

本発明の第１実施形態に係る２段型スクリュ圧縮機の概略構成図。1 is a schematic configuration diagram of a two-stage screw compressor according to a first embodiment of the present invention. 図１の制御装置を示すブロック図。The block diagram which shows the control apparatus of FIG. 図１の２段型スクリュ圧縮機の制御フロー。The control flow of the two-stage screw compressor of FIG. 図２の制御フロー中のサブルーチン。The subroutine in the control flow of FIG. １段目回転数比に対する総消費電力を最小化する２段目回転数比を示すグラフ。The graph which shows the 2nd stage rotation speed ratio which minimizes the total power consumption with respect to the 1st stage rotation speed ratio. 本発明の第２実施形態に係る２段型スクリュ圧縮機の制御装置を示すブロック図。The block diagram which shows the control apparatus of the two-stage type screw compressor which concerns on 2nd Embodiment of this invention. 図６の記憶部における１段目回転数比と２段目回転数比の関係を示すグラフ。The graph which shows the relationship between the 1st stage | paragraph rotation speed ratio in the memory | storage part of FIG. 6, and a 2nd stage | paragraph rotation speed ratio. 図６の２段型スクリュ圧縮機の制御フロー。FIG. 7 is a control flow of the two-stage screw compressor of FIG. 6. 本発明の第３実施形態に係る２段型スクリュ圧縮機の制御装置を示すブロック図。The block diagram which shows the control apparatus of the two-stage type screw compressor which concerns on 3rd Embodiment of this invention. 図９の２段型スクリュ圧縮機の制御フロー。Fig. 10 is a control flow of the two-stage screw compressor of Fig. 9. 図１０の制御フロー中のサブルーチン。The subroutine in the control flow of FIG.

以下、添付図面を参照して本発明の実施形態を説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

（第１実施形態）
図１に示すように、本実施形態の２段型スクリュ圧縮機２は、１段目圧縮機本体４と、２段目圧縮機本体６と、制御装置８とを備える。 (First embodiment)
As shown in FIG. 1, the two-stage screw compressor 2 of the present embodiment includes a first-stage compressor body 4, a second-stage compressor body 6, and a control device 8.

１段目圧縮機本体４は、スクリュ型であり、第１空気配管１０ａを通じて吸気口４ａから空気を吸気する。１段目圧縮機本体４には、機械的に第１モータ（第１電動機）１２が接続されており、第１モータ１２を駆動することにより、内部の図示しないスクリュで空気を圧縮する。第１モータ１２には、第１インバータ１４が電気的に接続されており、第１モータ１２の回転数を変更できる。また、第１モータ１２における消費電力は制御装置８に出力される。１段目圧縮機本体４は、圧縮後、圧縮空気を吐出口４ｂから吐出する。吐出された圧縮空気は、第２空気配管１０ｂを通じて２段目圧縮機本体６に供給される。   The first-stage compressor body 4 is a screw type, and sucks air from the intake port 4a through the first air pipe 10a. A first motor (first electric motor) 12 is mechanically connected to the first stage compressor body 4, and by driving the first motor 12, air is compressed by an internal screw (not shown). A first inverter 14 is electrically connected to the first motor 12, and the number of rotations of the first motor 12 can be changed. The power consumption in the first motor 12 is output to the control device 8. The first-stage compressor body 4 discharges compressed air from the discharge port 4b after compression. The discharged compressed air is supplied to the second stage compressor body 6 through the second air pipe 10b.

１段目圧縮機本体４の吐出口４ｂと２段目圧縮機本体６の吸気口６ａとを流体的に接続する第２空気配管１０ｂには、インタークーラ１６が設けられている。インタークーラ１６は、１段目圧縮機本体４における圧縮熱により上昇した第２空気配管１０ｂ内の圧縮空気の温度を低下させるために設けられている。インタークーラ１６の種類は特に限定されず、例えば熱交換器を使用してもよい。好ましくは、電力を消費しないものを使用することで２段型スクリュ圧縮機２の効率を向上できる。   An intercooler 16 is provided in the second air pipe 10 b that fluidly connects the discharge port 4 b of the first-stage compressor body 4 and the intake port 6 a of the second-stage compressor body 6. The intercooler 16 is provided to reduce the temperature of the compressed air in the second air pipe 10b that has risen due to the compression heat in the first stage compressor body 4. The kind of intercooler 16 is not specifically limited, For example, you may use a heat exchanger. Preferably, the efficiency of the two-stage screw compressor 2 can be improved by using one that does not consume power.

２段目圧縮機本体６は、スクリュ型であり、第２空気配管１０ｂを通じて１段目圧縮機本体４と流体的に接続され、１段目圧縮機本体４の下流側に設けられている。２段目圧縮機本体６は、第２空気配管１０ｂを通じて吸気口６ａから空気を吸気する。２段目圧縮機本体６には、機械的に第２モータ（第２電動機）１８が接続されており、第２モータ１８を駆動することにより、内部の図示しないスクリュで空気を圧縮する。第２モータ１８には、第２インバータ２０が電気的に接続されており、第２モータ１８の回転数を変更できる。また、第２モータ１８における消費電力は制御装置８に出力される。２段目圧縮機本体６は、圧縮後、圧縮空気を吐出口６ｂから吐出する。吐出された圧縮空気は、第３空気配管１０ｃを通じて供給先に供給される。   The second-stage compressor body 6 is a screw type and is fluidly connected to the first-stage compressor body 4 through the second air pipe 10 b and is provided on the downstream side of the first-stage compressor body 4. The second stage compressor body 6 sucks air from the intake port 6a through the second air pipe 10b. A second motor (second electric motor) 18 is mechanically connected to the second-stage compressor body 6, and the air is compressed by an internal screw (not shown) by driving the second motor 18. A second inverter 20 is electrically connected to the second motor 18, and the rotation speed of the second motor 18 can be changed. Further, the power consumption in the second motor 18 is output to the control device 8. The second-stage compressor body 6 discharges compressed air from the discharge port 6b after compression. The discharged compressed air is supplied to the supply destination through the third air pipe 10c.

２段目圧縮機本体６の吐出口６ｂから延びる第３空気配管１０ｃには、アフタークーラ２２及び圧力センサ２４が設けられている。アフタークーラ２２は、２段目圧縮機本体６における圧縮熱により上昇したる第３空気配管１０ｃ内の圧縮空気の温度を低下させるために設けられている。アフタークーラ２２の種類は特に限定されず、例えば熱交換器を使用してもよい。好ましくは、電力を消費しないものを使用することで２段型スクリュ圧縮機２のエネルギ効率を向上できる。また、圧力センサ２４により吐出空気の圧力（以降、吐出圧力という）を測定できる。圧力センサ２４は、測定値を制御装置８に出力する。   An after cooler 22 and a pressure sensor 24 are provided in the third air pipe 10 c extending from the discharge port 6 b of the second stage compressor body 6. The aftercooler 22 is provided in order to lower the temperature of the compressed air in the third air pipe 10c that rises due to the compression heat in the second-stage compressor body 6. The kind of aftercooler 22 is not specifically limited, For example, you may use a heat exchanger. Preferably, the energy efficiency of the two-stage screw compressor 2 can be improved by using one that does not consume power. Further, the pressure of the discharge air (hereinafter referred to as discharge pressure) can be measured by the pressure sensor 24. The pressure sensor 24 outputs the measured value to the control device 8.

制御装置８は、シーケンサ等のハードウェアと、それに実装されたソフトウェアにより構築されている。制御装置８は、図示しない供給先の要求圧力、第１モータ１２の消費電力、第２モータ１８の消費電力、及び圧力センサ２４から受けた測定値に基づいて、第１インバータ１４及び第２インバータ２０を制御する。   The control device 8 is constructed by hardware such as a sequencer and software installed therein. Based on the required pressure of the supply destination (not shown), the power consumption of the first motor 12, the power consumption of the second motor 18, and the measured value received from the pressure sensor 24, the control device 8 performs the first inverter 14 and the second inverter 20 is controlled.

図２に示すように、制御装置８は、１段目回転数決定部２５と、第１インバータ制御部２６と、探索部（２段目回転数決定部）２７と、第２インバータ制御部２８とを備える。   As shown in FIG. 2, the control device 8 includes a first stage rotational speed determination unit 25, a first inverter control unit 26, a search unit (second stage rotational speed determination unit) 27, and a second inverter control unit 28. With.

１段目回転数決定部２５は、第３空気配管１０ｃ（図１参照）下流の図示しない供給先の要求圧力に応じて１段目回転数を決定する。１段目回転数は、第１モータ１２の回転数である。具体的には、本実施形態では、圧力センサ２４で測定する吐出圧力が供給先の要求圧力と概略等しくなるように１段目回転数を決定する。   The first stage rotational speed determination unit 25 determines the first stage rotational speed according to the required pressure of a supply destination (not shown) downstream of the third air pipe 10c (see FIG. 1). The first stage rotational speed is the rotational speed of the first motor 12. Specifically, in the present embodiment, the first stage rotational speed is determined so that the discharge pressure measured by the pressure sensor 24 is approximately equal to the required pressure of the supply destination.

第１インバータ制御部２６は、１段目回転数決定部２５により決定された１段目回転数となるように第１インバータ１４を制御する。   The first inverter control unit 26 controls the first inverter 14 so that the first stage rotational speed determined by the first stage rotational speed determination unit 25 is obtained.

探索部２７は、第１モータ１２及び第２モータ１８からの測定値である総消費電力に基づいて、２段目回転数のうち総消費電力を最小化する最適２段目回転数を探索する。２段目回転数は、第２モータ１８の回転数である。また、総消費電力は、１段目圧縮機本体４及び２段目圧縮機本体６の両方によって消費される電力の和を表す。具体的には、本実施形態では、２段目回転数を所定範囲内で自動的に変化させ、個々の２段目回転数に対応する総消費電力を検出し、最小の総消費電力のときの最適２段目回転数を探索する。ここで、２段目回転数を探索する所定範囲は、２段目圧縮機本体６の定常運転の範囲と対応する第２モータ１８の回転数の範囲である。好ましくは、２段目圧縮機本体６の吐出温度等に応じて定められる第２モータ１８の定常運転時における下限回転数から、第２モータ１８の最大許容回転数あるいはモータ温度等に応じて定められる定常運転時における上限回転数までの範囲である。   The search unit 27 searches for the optimum second stage rotational speed that minimizes the total power consumption among the second stage rotational speeds, based on the total power consumption that is the measurement values from the first motor 12 and the second motor 18. . The second stage rotational speed is the rotational speed of the second motor 18. The total power consumption represents the sum of power consumed by both the first-stage compressor body 4 and the second-stage compressor body 6. Specifically, in the present embodiment, the second stage rotational speed is automatically changed within a predetermined range, the total power consumption corresponding to each second stage rotational speed is detected, and the minimum total power consumption is achieved. The optimum second stage rotation speed is searched. Here, the predetermined range for searching for the second stage rotational speed is the rotational speed range of the second motor 18 corresponding to the range of steady operation of the second stage compressor body 6. Preferably, it is determined according to the maximum allowable rotational speed of the second motor 18 or the motor temperature, etc., from the lower limit rotational speed at the time of steady operation of the second motor 18 determined according to the discharge temperature of the second stage compressor body 6 and the like. The range is up to the upper limit number of rotations during steady operation.

第２インバータ制御部２８は、探索部２７により探索された最適２段目回転数となるように第２インバータ２０を制御する。   The second inverter control unit 28 controls the second inverter 20 so that the optimum second stage rotation speed searched by the search unit 27 is obtained.

図３及び図４を参照して、本実施形態に係る制御方法について説明する。   With reference to FIG.3 and FIG.4, the control method which concerns on this embodiment is demonstrated.

図３に示すように、まず、２段型スクリュ圧縮機２の運転が開始されると（ステップＳ３−１）、１段目回転数Ｎ１及び２段目回転数Ｎ２を初期設定する（ステップＳ３−２）。１段目回転数Ｎ１及び２段目回転数Ｎ２の初期値は、例えばそれぞれの定格回転数を採用してもよい。そして、吐出空気圧力を圧力センサ２４により測定し、吐出空気圧力の測定値が所定範囲内であるか否かを１段目回転数決定部２５により判定する（ステップＳ３−３）。ここでの所定範囲とは、供給先の要求圧力を満たす圧縮空気を供給可能とする吐出空気圧力の範囲である。吐出空気圧力が所定範囲より高い場合、１段目回転数Ｎ１を所定回転数ΔＮだけ低下させ（ステップＳ３−４）、再び吐出空気圧力が所定範囲内であるか否かを判定する（ステップＳ３−３）。吐出空気圧力が所定範囲より低い場合、１段目回転数Ｎ１を所定回転数ΔＮだけ上昇させ（ステップＳ３−５）、再び吐出空気圧力が所定範囲内であるか否かを判定する（ステップＳ３−３）。吐出空気圧力が所定範囲内である場合、１段目回転数Ｎ１を決定し、第１インバータ制御部２６は１段目回転数決定部２５により決定された１段目回転数Ｎ１となるように第１インバータ１４を制御する（ステップＳ３−６）。   As shown in FIG. 3, when the operation of the two-stage screw compressor 2 is started (step S3-1), the first-stage rotation speed N1 and the second-stage rotation speed N2 are initialized (step S3). -2). As the initial values of the first stage rotational speed N1 and the second stage rotational speed N2, for example, the respective rated rotational speeds may be adopted. Then, the discharge air pressure is measured by the pressure sensor 24, and whether or not the measured value of the discharge air pressure is within a predetermined range is determined by the first-stage rotation speed determination unit 25 (step S3-3). Here, the predetermined range is a range of discharge air pressure that enables supply of compressed air that satisfies the required pressure of the supply destination. When the discharge air pressure is higher than the predetermined range, the first stage rotation speed N1 is decreased by the predetermined rotation speed ΔN (step S3-4), and it is determined again whether the discharge air pressure is within the predetermined range (step S3). -3). When the discharge air pressure is lower than the predetermined range, the first stage rotation speed N1 is increased by the predetermined rotation speed ΔN (step S3-5), and it is determined again whether the discharge air pressure is within the predetermined range (step S3). -3). When the discharge air pressure is within a predetermined range, the first stage rotational speed N1 is determined, and the first inverter control unit 26 is set to the first stage rotational speed N1 determined by the first stage rotational speed determination unit 25. The first inverter 14 is controlled (step S3-6).

次に、探索部２７により２段目回転数Ｎ２を探索する（ステップＳ３−７）。この探索に関するサブルーチンは図４を参照して後述する。そして、第２インバータ制御部２８は、探索部２７により探索された総消費電力Ｗを最小化する最適２段目回転数Ｎ２ｏｐｔとなるように第２インバータ２０を制御する（ステップＳ３−８）。これらの処理を完了後、再び吐出空気圧力が所定範囲内であるか否かを判定する（ステップＳ３−３）。   Next, the search unit 27 searches for the second rotation speed N2 (step S3-7). A subroutine related to this search will be described later with reference to FIG. And the 2nd inverter control part 28 controls the 2nd inverter 20 so that it may become the optimal 2nd stage rotation speed N2opt which minimizes the total power consumption W searched by the search part 27 (step S3-8). After completing these processes, it is again determined whether or not the discharge air pressure is within a predetermined range (step S3-3).

図４に示すように、探索部２７による２段目回転数Ｎ２の探索は行われる。２段目回転数Ｎ２の探索が開始されると（ステップＳ４−１）、２段目回転数Ｎ２を所定範囲の下限値に設定し（ステップＳ４−２）、総消費電力Ｗを測定してこのときの２段目回転数Ｎ２と総消費電力Ｗの組を記憶する（ステップＳ４−３）。２段目回転数Ｎ２の所定範囲とは、上述のように２段目圧縮機本体６の定常運転の範囲に対応する。そして、２段目回転数Ｎ２を所定回転数ΔＮだけ増加させ（ステップＳ４−４）、２段目回転数Ｎ２が所定範囲の上限値を超えるまでステップＳ４−３及びステップＳ４−４の処理を繰り返す（ステップＳ４−５）。ステップＳ４−４の２段目回転数Ｎ２の増分ΔＮは、図３のステップＳ３−３及びステップＳ３−４の所定回転数ΔＮと値が異なってもよい。そして、総消費電力Ｗが最小のときの最適２段目回転数Ｎ２ｏｐｔを決定し（ステップＳ４−６）、探索を終了する（ステップＳ４−７）。   As shown in FIG. 4, the search for the second stage rotation speed N2 by the search unit 27 is performed. When the search for the second rotation speed N2 is started (step S4-1), the second rotation speed N2 is set to a lower limit value within a predetermined range (step S4-2), and the total power consumption W is measured. A set of the second stage rotation speed N2 and the total power consumption W at this time is stored (step S4-3). The predetermined range of the second stage rotation speed N2 corresponds to the range of steady operation of the second stage compressor body 6 as described above. Then, the second stage rotational speed N2 is increased by a predetermined rotational speed ΔN (step S4-4), and the processes of steps S4-3 and S4-4 are performed until the second stage rotational speed N2 exceeds the upper limit value of the predetermined range. Repeat (step S4-5). The increment ΔN of the second stage rotational speed N2 in step S4-4 may be different from the predetermined rotational speed ΔN in steps S3-3 and S3-4 in FIG. Then, the optimum second stage rotation speed N2opt when the total power consumption W is minimum is determined (step S4-6), and the search is terminated (step S4-7).

図５は、このように探索部２７により記憶した２段目回転数Ｎ２とそれに対応する総消費電力Ｗとをグラフにプロットしたものである。探索部２７では、グラフ上の最小点である総消費電力Ｗが最小となる最適２段目回転数Ｎ２ｏｐｔを探索する。   FIG. 5 is a graph in which the second-stage rotation speed N2 stored by the search unit 27 and the corresponding total power consumption W are plotted in a graph. The search unit 27 searches for the optimal second stage rotation speed N2opt that minimizes the total power consumption W, which is the minimum point on the graph.

また、図４に示す２段目回転数Ｎ２の探索方法は単なる例示であり、その他の方法で総消費電力Ｗを最小化する最適２段目回転数Ｎ２ｏｐｔを探索してもよい。例えば、本実施形態のように測定した２段目回転数Ｎ２と総消費電力Ｗの組を全て記憶せずとも、新たに総消費電力Ｗを測定するごとに、それまでの総消費電力Ｗの最小値と比較し、最も総消費電力Ｗが小さい２段目回転数Ｎ２のみを記憶してもよい。この場合、最終的に記憶されている２段目回転数Ｎ２が総消費電力Ｗを最小化する最適２段目回転数Ｎ２ｏｐｔとなる。   Further, the search method for the second-stage rotation speed N2 shown in FIG. 4 is merely an example, and the optimum second-stage rotation speed N2opt that minimizes the total power consumption W may be searched by other methods. For example, every time the total power consumption W is newly measured without storing all the sets of the second-stage rotation speed N2 and the total power consumption W measured as in the present embodiment, Only the second-stage rotation speed N2 having the smallest total power consumption W compared to the minimum value may be stored. In this case, the second-stage rotation speed N2 that is finally stored is the optimum second-stage rotation speed N2opt that minimizes the total power consumption W.

図３及び図４の制御フローに示すように制御することで、２段型スクリュ圧縮機２において、１段目回転数を調整することにより要求圧力を実現すると共に、２段目回転数を調整することにより総消費電力を最小化できる。また、総消費電力を最小化する最適２段目回転数の探索を自動的に行うことができる。さらに、所定範囲内で２段目回転数を実際に変更して総消費電力を検出するため、総消費電力を最小化する最適２段目回転数を確実に探索できる。なお、空気の圧力と体積の積である重量流量は圧縮過程において一定であるため、１段目回転数による要求圧力の実現後に２段目回転数を変更しても要求圧力は実現できる構成となっている。   By controlling as shown in the control flow of FIG. 3 and FIG. 4, in the two-stage screw compressor 2, the required pressure is realized by adjusting the first-stage rotation speed and the second-stage rotation speed is adjusted. By doing so, the total power consumption can be minimized. Further, it is possible to automatically search for the optimum second stage rotation speed that minimizes the total power consumption. Furthermore, since the total power consumption is detected by actually changing the second-stage rotation speed within a predetermined range, the optimum second-stage rotation speed that minimizes the total power consumption can be reliably searched. Since the weight flow rate, which is the product of air pressure and volume, is constant during the compression process, the required pressure can be realized even if the second stage rotational speed is changed after the required pressure is achieved by the first stage rotational speed. It has become.

本実施形態では、探索部２７による探索の際、総消費電力を最小化する制御を行ったが、制御対象は消費電力に限定されない。例えば、総消費電力に代えて１段目圧縮機本体４及び２段目圧縮機本体６の動力や電流を最小化する制御を行ってもよい。これは以降の第２及び第３実施形態でも同様である。   In the present embodiment, the control for minimizing the total power consumption is performed during the search by the search unit 27, but the control target is not limited to the power consumption. For example, instead of the total power consumption, control for minimizing the power and current of the first-stage compressor body 4 and the second-stage compressor body 6 may be performed. This is the same in the following second and third embodiments.

（第２実施形態）
本実施形態の２段型スクリュ圧縮機２の構成は、図１に示す第１実施形態の構成と同一である。また、図６は、第１実施形態における図２に対応する第２実施形態の２段型スクリュ圧縮機２の制御装置８のブロック図を示している。本実施形態は、第１実施形態の探索部２７が記憶部（２段目回転数決定部）２９に置換されたことに関する以外は第１実施形態と実質的に同様である。従って、第１実施形態と同様の部分については説明を省略する場合がある。 (Second Embodiment)
The configuration of the two-stage screw compressor 2 of the present embodiment is the same as the configuration of the first embodiment shown in FIG. FIG. 6 shows a block diagram of the control device 8 of the two-stage screw compressor 2 of the second embodiment corresponding to FIG. 2 in the first embodiment. This embodiment is substantially the same as the first embodiment except that the search unit 27 of the first embodiment is replaced with a storage unit (second-stage rotation speed determination unit) 29. Therefore, description of the same parts as those in the first embodiment may be omitted.

図６に示すように、本実施形態の２段型スクリュ圧縮機２の制御装置８は、１段目回転数に対して総消費電力が最小となる最適２段目回転数を予め記憶した記憶部２９を備える。制御装置８は、第２インバータ制御部２８で２段目回転数を変更する際、１段目回転数に対して記憶部２９で記憶した最適２段目回転数を採用する。   As shown in FIG. 6, the control device 8 of the two-stage screw compressor 2 of the present embodiment stores a pre-stored optimum second-stage rotational speed that minimizes the total power consumption with respect to the first-stage rotational speed. The unit 29 is provided. When the second inverter control unit 28 changes the second stage rotational speed, the control device 8 adopts the optimum second stage rotational speed stored in the storage unit 29 with respect to the first stage rotational speed.

図７に示すのは、１段目回転数比に対する総消費電力を最小化する２段目回転数比のグラフである。グラフ中の縦軸及び横軸の１００％は、第１モータ１２及び第２モータ１８の回転数が許容回転数の最大値に達したことを表す。グラフ中、複数の線が描かれているのは、圧縮機本体４，６のスクリュロータのサイズや圧縮時の温度などの条件により、１段目回転数比に対する最適２段目回転数が変わるためである。記憶部２９は、図７のように種々の条件に対して予め実験等により求めた最適２段目回転数を記憶している。なお、図７に示したグラフは単なる例示であり、図７に示したグラフに基づいて最適２段目回転数の決定方法が限定されることはない。   FIG. 7 is a graph of the second stage rotational speed ratio that minimizes the total power consumption relative to the first stage rotational speed ratio. 100% of the vertical axis and the horizontal axis in the graph indicates that the rotation speeds of the first motor 12 and the second motor 18 have reached the maximum allowable rotation speed. In the graph, a plurality of lines are drawn depending on conditions such as the size of the screw rotors of the compressor main bodies 4 and 6 and the temperature at the time of compression. Because. As shown in FIG. 7, the storage unit 29 stores the optimum second-stage rotation speed obtained in advance through experiments or the like for various conditions. Note that the graph shown in FIG. 7 is merely an example, and the determination method of the optimum second stage rotation speed is not limited based on the graph shown in FIG.

図８に示すのは、本実施形態の２段型スクリュ圧縮機２の制御フローである。本実施形態では、ステップＳ８−７の処理以外は図３の第１実施形態と実質的に同様である。ステップＳ８−７の処理では、記憶部２９で記憶した２段目回転数Ｎ２を採用している。従って、要求圧力に応じて必要な１段目回転数Ｎ１が決まると、総消費電力Ｗを最小化する最適２段目回転数Ｎ２ｏｐｔを予め記憶しているため、運転中に２段目回転数Ｎ２を探索することなく即時に決定できる   FIG. 8 shows a control flow of the two-stage screw compressor 2 of the present embodiment. This embodiment is substantially the same as the first embodiment of FIG. 3 except for the processing of step S8-7. In the process of step S8-7, the second rotation speed N2 stored in the storage unit 29 is employed. Accordingly, when the required first stage rotational speed N1 is determined according to the required pressure, the optimum second stage rotational speed N2opt that minimizes the total power consumption W is stored in advance, so that the second stage rotational speed during operation is stored. Can be determined immediately without searching for N2

（第３実施形態）
本実施形態の２段型スクリュ圧縮機２の構成は図１に示す第１実施形態の構成と同一である。また、図９は、第１実施形態における図２に対応する第３実施形態の２段型スクリュ圧縮機２の制御装置８のブロック図を示している。図１０及び図１１は、第１実施形態における図３及び図４に対応する第３実施形態の２段型スクリュ圧縮機２の制御装置８の制御フローを示している。本実施形態の２段型スクリュ圧縮機２は、第１実施形態の１段目回転数及び２段目回転数に関する制御が入れ替えられていることに関する以外は第１実施形態と実質的に同様である。従って、第１実施形態と同様の部分については説明を省略する場合がある。 (Third embodiment)
The configuration of the two-stage screw compressor 2 of the present embodiment is the same as the configuration of the first embodiment shown in FIG. FIG. 9 shows a block diagram of the control device 8 of the two-stage screw compressor 2 of the third embodiment corresponding to FIG. 2 in the first embodiment. 10 and 11 show a control flow of the control device 8 of the two-stage screw compressor 2 of the third embodiment corresponding to FIGS. 3 and 4 in the first embodiment. The two-stage screw compressor 2 of the present embodiment is substantially the same as the first embodiment except that the control relating to the first-stage rotation speed and the second-stage rotation speed of the first embodiment is interchanged. is there. Therefore, description of the same parts as those in the first embodiment may be omitted.

図９に示すように、本実施形態の２段型スクリュ圧縮機２の制御装置８は、２段目回転数決定部２７において要求圧力に応じた吐出圧力となるように２段目回転数を決定する。第２インバータ制御部２８は、２段目回転数決定部２７で決定された２段目回転数となるように第２インバータ２０を制御する。また、探索部（１段目回転数決定部）２５は、第１モータ１２及び第２モータ１８からの測定値である総消費電力に基づいて、１段目回転数のうち総消費電力を最小化する最適１段目回転数を探索する。具体的な探索方法は第１実施形態の最適２段目回転数の探索と同様である。   As shown in FIG. 9, the control device 8 of the two-stage screw compressor 2 of the present embodiment sets the second-stage rotation speed so that the discharge pressure corresponding to the required pressure is obtained in the second-stage rotation speed determination unit 27. decide. The second inverter control unit 28 controls the second inverter 20 so that the second stage rotational speed determined by the second stage rotational speed determination unit 27 is obtained. Further, the search unit (first-stage rotation speed determination unit) 25 minimizes the total power consumption in the first-stage rotation speed based on the total power consumption that is the measurement value from the first motor 12 and the second motor 18. The optimum first stage rotation speed to be converted is searched. A specific search method is the same as the search for the optimum second stage rotation speed in the first embodiment.

図１０及び図１１に示すように、本実施形態の制御フローは、図３及び図４に示す第１実施形態の制御フローから１段目回転数Ｎ１と２段目回転数Ｎ２についての記載が入れ替わっている。また、図１０のサブルーチン処理においても同様に、図４に示す第１実施形態のサブルーチン処理から１段目回転数Ｎ１と２段目回転数Ｎ２についての記載が入れ替わっている。従って、本実施形態では第１実施形態と異なり２段目回転数の決定後に１段目回転数が決定される。   As shown in FIGS. 10 and 11, the control flow of the present embodiment describes the first-stage rotation speed N1 and the second-stage rotation speed N2 from the control flow of the first embodiment shown in FIGS. 3 and 4. It has been replaced. Similarly, in the subroutine processing of FIG. 10, the descriptions about the first-stage rotation speed N1 and the second-stage rotation speed N2 are switched from the subroutine processing of the first embodiment shown in FIG. Therefore, in the present embodiment, unlike the first embodiment, the first-stage rotation speed is determined after the determination of the second-stage rotation speed.

このように、探索の際に１段目回転数と２段目回転数のいずれの回転数を先に決定するかは限定されない。   As described above, there is no limitation on which of the first-stage rotation speed and the second-stage rotation speed is determined first in the search.

以上より本発明の具体的な実施形態について説明したが、本発明は上記実施形態に限定されるものではなく、この発明の範囲内で種々変更して実施することができる。例えば、上記第１から第３実施形態で記載した内容を適宜組み合わせたものを、この発明の一実施形態としてもよい。   Although specific embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. For example, what combined suitably the content described in the said 1st-3rd embodiment is good also as one Embodiment of this invention.

２ ２段型スクリュ圧縮機
４ １段目圧縮機本体
４ａ 吸気口
４ｂ 吐出口
６ ２段目圧縮機本体
６ａ 吸気口
６ｂ 吐出口
８ 制御装置
１０ａ 第１空気配管
１０ｂ 第２空気配管
１０ｃ 第３空気配管
１２ 第１モータ（第１電動機）
１４ 第１インバータ
１６ インタークーラ
１８ 第２モータ（第２電動機）
２０ 第２インバータ
２２ アフタークーラ
２４ 圧力センサ
２５ １段目回転数決定部（探索部）
２６ 第１インバータ制御部
２７ 探索部（２段目回転数決定部）
２８ 第２インバータ制御部
２９ 記憶部（２段目回転数決定部） 2 Second stage screw compressor 4 First stage compressor body 4a Intake port 4b Discharge port 6 Second stage compressor body 6a Inlet port 6b Discharge port 8 Controller 10a First air pipe 10b Second air pipe 10c Third air Piping 12 First motor (first electric motor)
14 First inverter 16 Intercooler 18 Second motor (second electric motor)
20 Second inverter 22 After cooler 24 Pressure sensor 25 First stage rotation speed determination unit (search unit)
26 1st inverter control part 27 Search part (2nd stage rotation speed determination part)
28 Second inverter control unit 29 Storage unit (second stage rotation speed determination unit)

Claims (6)

第１インバータで回転数を変更可能である第１電動機により駆動される１段目圧縮機本体と、
第２インバータで回転数を変更可能である第２電動機により駆動され、前記１段目圧縮機本体の下流側に直列に接続された２段目圧縮機本体と、
要求圧力に応じて１段目回転数を決定する１段目回転数決定部と、前記１段目回転数決定部により決定された前記１段目回転数となるように前記第１インバータを制御する第１インバータ制御部と、２段目回転数のうち前記第１電動機および前記第２電動機の総消費電力を最小化する最適２段目回転数を決定する２段目回転数決定部と、前記最適２段目回転数となるように前記第２インバータを制御する第２インバータ制御部とを有する制御装置と
を備え、
前記２段目回転数決定部は、所定範囲内で前記２段目回転数を自動的に変化させて個々の前記２段目回転数に対応する前記総消費電力を検出し、前記最適２段目回転数を探索する、２段型スクリュ圧縮機。 A first-stage compressor body driven by a first electric motor whose rotation speed can be changed by a first inverter;
A second stage compressor body driven by a second electric motor capable of changing the rotational speed by a second inverter and connected in series to the downstream side of the first stage compressor body;
A first-stage rotation speed determination unit that determines the first-stage rotation speed according to the required pressure, and the first inverter is controlled so as to be the first-stage rotation speed determined by the first-stage rotation speed determination unit. A first inverter control unit, a second stage rotational speed determination unit that determines an optimal second stage rotational speed that minimizes total power consumption of the first electric motor and the second motor among the second stage rotational speeds, A control device having a second inverter control unit for controlling the second inverter so as to achieve the optimum second stage rotational speed ,
The second-stage rotation speed determination unit automatically changes the second-stage rotation speed within a predetermined range to detect the total power consumption corresponding to each of the second-stage rotation speeds, and A two-stage screw compressor that searches for the number of eye rotations . 前記２段目回転数決定部は、  The second stage rotation speed determination unit is
前記２段目回転数を定常運転の範囲の下限値に設定し、前記総消費電力を測定してこのときの前記２段目回転数と前記総消費電力の組を記憶し、  Set the second stage rotational speed to the lower limit of the range of steady operation, measure the total power consumption, and store the set of the second stage rotational speed and the total power consumption at this time,
前記２段目回転数を所定回転数だけ増加させ、前記総消費電力を測定してこのときの前記２段目回転数と前記総消費電力の組を記憶し、  Increase the second stage rotational speed by a predetermined rotational speed, measure the total power consumption, and store the set of the second stage rotational speed and the total power consumption at this time,
前記２段目回転数が定常運転の範囲の上限値を超えるまでこの処理を繰り返すことで、前記最適２段目回転数を決定する、請求項１に記載の２段型スクリュ圧縮機。  2. The two-stage screw compressor according to claim 1, wherein the optimum second-stage rotation speed is determined by repeating this process until the second-stage rotation speed exceeds an upper limit value of a range of steady operation. 第１インバータで回転数を変更可能である第１電動機により駆動される１段目圧縮機本体と、
第２インバータで回転数を変更可能である第２電動機により駆動され、前記１段目圧縮機本体の下流側に直列に接続された２段目圧縮機本体と、
要求圧力に応じて２段目回転数を決定する２段目回転数決定部と、前記２段目回転数決定部により決定された前記２段目回転数となるように前記第２インバータを制御する第２インバータ制御部と、１段目回転数のうち総消費電力を最小化する最適１段目回転数を決定する１段目回転数決定部と、前記最適１段目回転数となるように前記第１インバータを制御する第１インバータ制御部とを有する制御装置と
を備え、
前記１段目回転数決定部は、所定範囲内で前記１段目回転数を自動的に変化させて個々の前記１段目回転数に対応する前記総消費電力を検出し、前記最適１段目回転数を探索する、２段型スクリュ圧縮機。 A first-stage compressor body driven by a first electric motor whose rotation speed can be changed by a first inverter;
A second stage compressor body driven by a second electric motor capable of changing the rotational speed by a second inverter and connected in series to the downstream side of the first stage compressor body;
A second-stage rotational speed determination unit that determines the second-stage rotational speed according to the required pressure, and the second inverter is controlled so that the second-stage rotational speed is determined by the second-stage rotational speed determination unit. A second inverter control unit that performs the first-stage rotation speed determination unit that determines the optimal first-stage rotation speed that minimizes the total power consumption among the first-stage rotation speeds, and the optimal first-stage rotation speed. And a control device having a first inverter control unit for controlling the first inverter ,
The first-stage rotational speed determination unit automatically changes the first-stage rotational speed within a predetermined range to detect the total power consumption corresponding to each of the first-stage rotational speeds, and the optimal first-stage rotational speed is determined. A two-stage screw compressor that searches for the number of eye rotations . 前記１段目回転数決定部は、  The first stage rotation speed determination unit
前記１段目回転数を定常運転の範囲の下限値に設定し、前記総消費電力を測定してこのときの前記１段目回転数と前記総消費電力の組を記憶し、  The first stage rotational speed is set to the lower limit value of the range of steady operation, the total power consumption is measured, and the set of the first stage rotational speed and the total power consumption at this time is stored.
前記１段目回転数を所定回転数だけ増加させ、前記総消費電力を測定してこのときの前記１段目回転数と前記総消費電力の組を記憶し、  Increase the first stage rotational speed by a predetermined rotational speed, measure the total power consumption, and store the set of the first stage rotational speed and the total power consumption at this time,
前記１段目回転数が定常運転の範囲の上限値を超えるまでこの処理を繰り返すことで、前記最適１段目回転数を決定する、請求項３に記載の２段型スクリュ圧縮機。  The two-stage screw compressor according to claim 3, wherein the optimum first-stage rotation speed is determined by repeating this process until the first-stage rotation speed exceeds an upper limit value of a steady operation range. 第１インバータで回転数を変更可能である第１電動機により駆動される１段目圧縮機本体と、
第２インバータで回転数を変更可能である第２電動機により駆動され、前記１段目圧縮機本体の下流側に直列に接続された２段目圧縮機本体と
を設け、
要求圧力に応じた１段目回転数を決定し、
この１段目回転数となるように前記第１インバータを制御し、
所定範囲内で２段目回転数を変化させて個々の前記２段目回転数に対応する前記総消費電力を検出し、前記２段目回転数のうち前記第１電動機および前記第２電動機の総消費電力を最小化する最適２段目回転数を探索および決定し、
この最適２段目回転数となるように前記第２インバータを制御する、２段型スクリュ圧縮機の運転方法。 A first-stage compressor body driven by a first electric motor whose rotation speed can be changed by a first inverter;
A second stage compressor body driven by a second electric motor whose rotation speed can be changed by a second inverter and connected in series downstream of the first stage compressor body;
Determine the first stage rotation speed according to the required pressure,
The first inverter is controlled to achieve the first stage rotational speed;
The total power consumption corresponding to each of the second-stage rotation speeds is detected by changing the second-stage rotation speed within a predetermined range, and the first electric motor and the second electric motor among the second-stage rotation speeds are detected. Search and determine the optimal second stage rotation speed that minimizes the total power consumption,
A method for operating a two-stage screw compressor, wherein the second inverter is controlled to achieve the optimum second-stage rotation speed. 第１インバータで回転数を変更可能である第１電動機により駆動される１段目圧縮機本体と、
第２インバータで回転数を変更可能である第２電動機により駆動され、前記１段目圧縮機本体の下流側に直列に接続された２段目圧縮機本体と、
を設け、
要求圧力に応じた２段目回転数を決定し、
この２段目回転数となるように前記第２インバータを制御し、
所定範囲内で１段目回転数を変化させて個々の前記１段目回転数に対応する前記総消費電力を検出し、前記１段目回転数のうち前記第１電動機および前記第２電動機の総消費電力を最小化する最適１段目回転数を探索および決定し、
この最適１段目回転数となるように前記第１インバータを制御する、２段型スクリュ圧縮機の運転方法。 A first-stage compressor body driven by a first electric motor whose rotation speed can be changed by a first inverter;
A second stage compressor body driven by a second electric motor capable of changing the rotational speed by a second inverter and connected in series to the downstream side of the first stage compressor body;
Provided,
Determine the second stage rotation speed according to the required pressure,
Controlling the second inverter so as to achieve the second stage rotational speed;
The total power consumption corresponding to each of the first stage rotational speeds is detected by changing the first stage rotational speed within a predetermined range, and the first electric motor and the second electric motor among the first stage rotational speeds Search and determine the optimal first stage rotation speed that minimizes the total power consumption,
A method for operating a two-stage screw compressor, wherein the first inverter is controlled to achieve the optimum first-stage rotation speed.
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