JP2007002852A - Screw compressor and method for controlling screw compressor - Google Patents
Screw compressor and method for controlling screw compressor Download PDFInfo
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本発明は、スクリュー圧縮機の技術に関する。 The present invention relates to a screw compressor technology.
この種のスクリュー圧縮機としては、例えば特開平6−200886号公報に記載の技術がある。従来のスクリュー圧縮機は、空気を圧縮する圧縮機本体と、この圧縮機本体を駆動するモータと、このモータの回転数を制御するインバータを備え、さらに、圧縮機本体から吐出される吐出空気の圧力を検出する吐出空気圧力検出手段と、その圧力検出値をモータに帰還する情報伝達手段とを備え、その圧力検出値に基づいてモータの回転数を制御して圧縮機の吐出空気量を加減する機能を備えていた。 As this type of screw compressor, for example, there is a technique described in JP-A-6-200886. A conventional screw compressor includes a compressor main body that compresses air, a motor that drives the compressor main body, and an inverter that controls the rotation speed of the motor, and further, discharge air discharged from the compressor main body. Discharge air pressure detection means for detecting pressure and information transmission means for returning the pressure detection value to the motor, and controlling the number of rotations of the motor based on the pressure detection value to adjust the discharge air amount of the compressor It had a function to do.
しかしながら上述の従来のスクリュー圧縮機では、吐出空気圧力検出手段の設定圧力値を変化させても圧縮機の最高回転数が固定されているので、圧縮機の出力側における使用空気量が定格空気量を越えた場合に、その圧縮機の吐出圧力が必要となる設定圧力よりも低下してしまう事態が生じていた。 However, in the conventional screw compressor described above, the maximum rotational speed of the compressor is fixed even if the set pressure value of the discharge air pressure detecting means is changed, so that the amount of air used on the output side of the compressor is the rated air amount. When the pressure exceeds the range, there has been a situation in which the discharge pressure of the compressor is lower than the required set pressure.
例えば、圧縮機の吐出圧力についての設定圧力値が0.83MPaの場合と0.59MPaの場合とにおいても圧縮機の最高回転数は同一値となっている。このために、吐出圧力の設定圧力値を下げた場合において、圧縮機動力が軽減しモータの負荷に余裕が生じる(設定圧力値が0.83MPaの場合と0.59MPaの場合では圧縮機動力は約20%軽減する)のに対して、圧縮機の吐出空気量の最大値は、ほぼ同一である。 For example, the maximum rotational speed of the compressor is the same value when the set pressure value for the discharge pressure of the compressor is 0.83 MPa and 0.59 MPa. For this reason, when the set pressure value of the discharge pressure is lowered, the compressor power is reduced and a margin is generated in the motor load (the compressor power is reduced when the set pressure value is 0.83 MPa and 0.59 MPa. On the other hand, the maximum discharge air amount of the compressor is almost the same.
これらにより、従来のスクリュー圧縮機では、使用空気量が所定の空気量を越えた場合には、圧縮機を駆動するモータの能力に余裕があるにもかかわらず、圧縮機の吐出圧力が設定圧力以下に低下してしまい、圧縮機の能力を最大限に発揮することができないという問題がある。 As a result, in the conventional screw compressor, when the amount of air used exceeds the predetermined amount of air, the discharge pressure of the compressor is set to the set pressure even though there is a margin in the capacity of the motor that drives the compressor. There is a problem that the capacity of the compressor cannot be maximized due to a decrease in the following.
そこで本発明は、圧縮機の能力を最大限に発揮することを課題とする。 Therefore, an object of the present invention is to maximize the capacity of the compressor.
本発明のスクリュー圧縮機は、空気を圧縮する圧縮機本体と、この圧縮機本体を駆動するモータと、圧縮機本体から吐出される吐出空気の圧力を検出する吐出空気圧力検出手段とを有するスクリュー圧縮機において、圧縮機本体から吐出される吐出空気の圧力を任意に変化させて設定可能に構成すると共に、この設定された圧力値に応じてモータの負荷容量の範囲内で最大の空気量が得られるように、モータの最高回転数を予め設定し、設定圧力値でかつ最高回転数の範囲内で使用空気量に応じてモータの回転数を制御することを特徴とする。 A screw compressor according to the present invention includes a compressor body that compresses air, a motor that drives the compressor body, and a discharge air pressure detection unit that detects the pressure of the discharge air discharged from the compressor body. The compressor is configured so that the pressure of the discharge air discharged from the compressor body can be arbitrarily changed and set, and the maximum amount of air within the range of the motor load capacity is set according to the set pressure value. As obtained, the maximum number of rotations of the motor is preset, and the number of rotations of the motor is controlled according to the amount of air used within the range of the set pressure value and the maximum number of rotations.
また、空気を圧縮する圧縮機本体と、この圧縮機本体を駆動するモータと、このモータの回転数を制御するインバータと、圧縮機本体から吐出される吐出空気の圧力を検出する圧力センサと、この圧力センサの圧力検出値に基づいてインバータの動作を制御して圧縮機本体の吐出空気量を加減する回転数制御装置とを備えたスクリュー圧縮機において、圧縮機本体から吐出される吐出空気の圧力を任意に変化させて設定できる吐出圧力設定装置と、この吐出圧力設定装置により設定された圧力に基づきモータの負荷容量の範囲内でモータの最高回転数を定める最高回転数制御装置とを備え、吐出圧力設定装置で設定された圧力になるように制御されると共に、最高回転数の範囲内で使用空気量に応じてモータの回転数を制御する構成とすることができる。 Further, a compressor main body that compresses air, a motor that drives the compressor main body, an inverter that controls the rotation speed of the motor, a pressure sensor that detects the pressure of discharged air discharged from the compressor main body, In a screw compressor provided with a rotation speed control device that controls the operation of an inverter based on the pressure detection value of the pressure sensor to adjust the amount of air discharged from the compressor body, the amount of discharge air discharged from the compressor body Equipped with a discharge pressure setting device that can be set by arbitrarily changing the pressure, and a maximum rotation speed control device that determines the maximum rotation number of the motor within the range of the motor load capacity based on the pressure set by the discharge pressure setting device The motor is controlled so as to have a pressure set by the discharge pressure setting device, and the rotational speed of the motor is controlled in accordance with the amount of air used within the range of the maximum rotational speed. Can.
さらに、空気を圧縮する圧縮機本体と、この圧縮機本体を駆動するモータと、このモータの回転数を制御するインバータと、圧縮機本体から吐出される吐出空気の圧力を検出する圧力センサとを備えたスクリュー圧縮機において、圧縮機本体から吐出される吐出空気の圧力を定格圧力より低い圧力に設定可能に構成すると共に、定格圧力より低い圧力に設定された場合には、モータの負荷容量の範囲内で定格空気量以上の空気量が得られるように圧縮機本体の最高回転数を定め、設定圧力に制御すると共に、前記最高回転数の範囲内で需要機器の使用空気量に応じてモータの回転数を制御する構成とすることができる。 Furthermore, a compressor main body that compresses air, a motor that drives the compressor main body, an inverter that controls the rotation speed of the motor, and a pressure sensor that detects the pressure of the discharge air discharged from the compressor main body. In the screw compressor provided, the pressure of the discharge air discharged from the compressor body can be set to a pressure lower than the rated pressure, and when the pressure is set lower than the rated pressure, the load capacity of the motor The maximum number of revolutions of the compressor body is determined so that an air quantity exceeding the rated air quantity can be obtained within the range, and the pressure is controlled to the set pressure. The number of rotations can be controlled.
また、圧縮機本体と、この圧縮機本体を駆動するモータとを備え、需要機器の使用空気量に応じて圧縮機本体の回転数が制御されるスクリュー圧縮機において、圧縮機本体の吐出圧力を所望の吐出圧力に任意に変更して設定可能な吐出圧力設定装置と、吐出圧力設定値に応じ、モータの負荷容量の範囲内でこのモータの最高回転数を予め設定しておく最高回転数制御装置とを備え、吐出圧力設定装置で任意に変更して設定される吐出圧力設定値が下げられるに従い予め設定される最高回転数の値が大きくなるように構成することができる。ここで、最高回転数制御装置は、吐出圧力設定値に略反比例させてモータの最高回転数を定めることが好ましい。 Further, in a screw compressor that includes a compressor body and a motor that drives the compressor body, and the number of rotations of the compressor body is controlled according to the amount of air used by demand equipment, the discharge pressure of the compressor body is controlled. Discharge pressure setting device that can be set by changing to desired discharge pressure, and maximum rotation speed control that presets the maximum rotation speed of this motor within the range of motor load capacity according to the discharge pressure setting value And a maximum rotation speed value that is set in advance as the discharge pressure set value that is arbitrarily changed and set by the discharge pressure setting device is lowered. Here, it is preferable that the maximum rotation speed control device determines the maximum rotation speed of the motor substantially in inverse proportion to the discharge pressure set value.
本発明によれば、圧縮機の能力を最大限に発揮することができる。 According to the present invention, the capacity of the compressor can be maximized.
以下、本発明の実施の形態について図面を参照して説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
図1は、本発明の実施の形態に係るスクリュー圧縮機の系統図である。本スクリュー圧縮機は、空気を圧縮する圧縮機本体3と、この圧縮機本体3を駆動するモータ2と、このモータ2に所望の電力を供給してそのモータ2の回転数を制御するインバータ1と、圧縮機本体3から吐出される吐出空気の圧力を検出する吐出空気圧力検出手段である圧力センサ7と、この圧力センサ7の圧力検出値に基づいてインバータ1の動作を制御して圧縮機本体3の吐出空気量を加減する回転数制御装置8とを備えている。
FIG. 1 is a system diagram of a screw compressor according to an embodiment of the present invention. The screw compressor includes a
さらに、本スクリュー圧縮機は、圧縮機本体3から吐出される吐出空気圧力の所望の基準値となる吐出圧力設定値を定める吐出圧力設定装置10と、その吐出圧力設定値に応じてモータ2の最高回転数を定める最高回転数制御装置9とを備えている。なお、本スクリュー圧縮機は、以下に説明するオイルセパレータ、エアクーラ5及び吐出配管6も備えている。
Further, the present screw compressor includes a discharge pressure setting device 10 that determines a discharge pressure setting value that is a desired reference value of the discharge air pressure discharged from the
次に、本スクリュー圧縮機の動作について説明する。まず、インバータ1から電力を供給されてモータ2が回転し、このモータ2の回転により圧縮機本体3が駆動される。
Next, the operation of the present screw compressor will be described. First, electric power is supplied from the inverter 1 to rotate the
そして、圧縮機本体3によって所定の圧力まで圧縮された空気は、圧縮工程で混入された潤滑油とともに、オイルセパレータ4に入る。ここで潤滑油と分離された圧縮空気は、エアクーラ5及び吐出配管6を経て外部へと吐出される。
The air compressed to a predetermined pressure by the
吐出配管6に設けられた圧力センサ7は、圧縮空気の圧力を検出しその検出値を回転数制御装置8へとフィードバックする。回転数制御装置8は、圧縮空気の需要機器使用空気量に応じた運転回転数を演算し、その値に基づいてインバータ1を制御してモータ2の回転数を制御する。
A pressure sensor 7 provided in the discharge pipe 6 detects the pressure of the compressed air and feeds back the detected value to the rotation
ここで、運転回転数の制御範囲は、吐出圧力設定装置10により設定された圧力に基づき、あらかじめ最高回転数制御装置9内に設定された回転数を上限とする。 Here, the control range of the operating rotational speed is based on the pressure set by the discharge pressure setting device 10 and the rotational speed set in the maximum rotational speed control device 9 in advance as an upper limit.
図2は、本スクリュー圧縮機における運転可能範囲を吐出圧力設定値と回転数比によって示したグラフである。このグラフ上に示す台形の内部が運転可能な範囲である。例えば、吐出圧力設定値が定格値0.83MPaでの最高回転数を100%とすると、吐出圧力設定値を下げるに従い最高回転数の上限を大きくさせている。 FIG. 2 is a graph showing the operable range of the screw compressor according to the discharge pressure set value and the rotation speed ratio. The inside of the trapezoid shown on this graph is an operable range. For example, assuming that the maximum rotation speed when the discharge pressure set value is the rated value 0.83 MPa is 100%, the upper limit of the maximum rotation speed is increased as the discharge pressure set value is decreased.
すなわち、最高回転数制御装置9は、吐出圧力設定値に略反比例させてモータの最高回転数を定ている。 In other words, the maximum rotation speed control device 9 determines the maximum rotation speed of the motor substantially in inverse proportion to the discharge pressure set value.
この例では、吐出圧力設定値を下げ、0.59MPaとした場合に、最高回転数は、前述の0.83MPa時に比べ120%の回転数となる。 In this example, when the discharge pressure set value is lowered to 0.59 MPa, the maximum rotational speed is 120% compared to the above-mentioned 0.83 MPa.
一方、従来のスクリュー圧縮機では、吐出空気圧力検出手段の設定圧力値を変化させても圧縮機の最高回転数が固定されているので、例えば、圧縮機の吐出圧力設定値が0.83MPaの場合と0.59MPaの場合とにおいても圧縮機の最高回転数は同一値となり、設定圧力値が0.59MPaの場合には、モータ2の最高回転数が本スクリュー圧縮機よりも20%低い値に抑えられてしまう。
On the other hand, in the conventional screw compressor, the maximum rotation speed of the compressor is fixed even when the set pressure value of the discharge air pressure detecting means is changed. For example, the discharge pressure set value of the compressor is 0.83 MPa. The maximum rotational speed of the compressor is the same in both the case and the case of 0.59 MPa. When the set pressure value is 0.59 MPa, the maximum rotational speed of the
すなわち、本スクリュー圧縮機の動作範囲は、図2における点a,b,c,dで囲まれる台形の範囲であるのに対し、従来のスクリュー圧縮機の動作範囲は、図2における点a,j,c,dで囲まれる長方形の範囲しかない。 That is, the operating range of the present screw compressor is a trapezoidal range surrounded by points a, b, c, and d in FIG. 2, whereas the operating range of the conventional screw compressor is the point a, There is only a rectangular range surrounded by j, c, and d.
これらにより、本スクリュー圧縮機は、需要機器の使用空気量に応じて圧縮機本体の回転数を制御しているスクリュー圧縮機において、吐出圧力設定値に応じた最高回転数を設定することにより、定格圧力より低い圧力を設定した場合には、モータの負荷容量の範囲内で、定格空気量以上の空気量が得られ、定格空気量を越えた場合に発生する吐出圧力の低下を防止することができる。なお、ここで、定格値というのは、製品仕様での代表値である。 By these, this screw compressor is the screw compressor which controls the number of rotations of the compressor body according to the amount of air used by the demand equipment, by setting the maximum number of rotations according to the discharge pressure set value, If a pressure lower than the rated pressure is set, an air volume that exceeds the rated air volume can be obtained within the range of the load capacity of the motor, and a drop in the discharge pressure that occurs when the rated air volume is exceeded should be prevented. Can do. Here, the rated value is a representative value in the product specification.
図3は、本スクリュー圧縮機における最高回転数制御装置9の動作特性の一例を示すグラフである。このグラフに示すように、吐出圧力設定値Pと最高回転数比xとの関係は、
P=ax+b
という数式で表せる。ここで、定数aは、設定圧力の定格値に応じて決まる値であり、定数bは、設定圧力値の下限値に応じて決まる値である。
FIG. 3 is a graph showing an example of operating characteristics of the maximum rotation speed control device 9 in the screw compressor. As shown in this graph, the relationship between the discharge pressure setting value P and the maximum rotation speed ratio x is
P = ax + b
It can be expressed by the following formula. Here, the constant a is a value determined according to the rated value of the set pressure, and the constant b is a value determined according to the lower limit value of the set pressure value.
また、吐出圧力設定値Pと最高回転数比xとの関係は、上記数式に限定されるものではなく、例えば、各種の吐出圧力設定値Pとそのそれぞれに対応する最高回転数比xとの関係を示すデータをメモリなどに予め設定しておいてもよい。 Further, the relationship between the discharge pressure setting value P and the maximum rotation speed ratio x is not limited to the above formula, and for example, various discharge pressure setting values P and the maximum rotation speed ratio x corresponding to each of the discharge pressure setting values P Data indicating the relationship may be preset in a memory or the like.
図4は、最高回転数制御装置9の動作特性の具体例を示すグラフであり、設定圧力の定格値を0.83MPa、下限値を0.59MPaとしている。これより、吐出圧力設定値Pと最高回転数比xとの関係は、
P=−0.012x+2.03
という数式で表せる。
FIG. 4 is a graph showing a specific example of the operating characteristics of the maximum rotational speed control device 9, wherein the rated value of the set pressure is 0.83 MPa and the lower limit value is 0.59 MPa. From this, the relationship between the discharge pressure set value P and the maximum rotational speed ratio x is
P = −0.012x + 2.03
It can be expressed by the following formula.
上述するように、本実施形態によれば、圧縮機の動作範囲が広いので、圧縮機の吐出圧力設定値を下げた場合において、圧縮機出力側の使用空気量が従来の定格値を超えて増大しても、圧縮機の能力を最大限に発揮することができて、圧縮機の吐出圧力の低下を防止することができる。 As described above, according to this embodiment, since the operating range of the compressor is wide, when the discharge pressure setting value of the compressor is lowered, the amount of air used on the compressor output side exceeds the conventional rated value. Even if it increases, the capacity of the compressor can be maximized and the discharge pressure of the compressor can be prevented from decreasing.
1 インバータ
2 モータ
3 圧縮機本体
4 オイルセパレータ
5 エアクーラ
6 吐出配管
7 圧力センサ
8 回転数制御装置
9 最高回転数制御装置
10 吐出圧力設定装置
DESCRIPTION OF SYMBOLS 1
Claims (4)
前記圧縮機本体から吐出される吐出空気の圧力を任意に変化させて設定可能に構成すると共に、当該設定された圧力値に応じてモータの負荷容量の範囲内で最大の空気量が得られるように、前記モータの最高回転数を予め設定し、前記設定圧力値でかつ前記最高回転数の範囲内で使用空気量に応じて前記モータの回転数を制御することを特徴とするスクリュー圧縮機。 In a screw compressor having a compressor body that compresses air, a motor that drives the compressor body, and discharge air pressure detection means that detects the pressure of discharge air discharged from the compressor body,
The pressure of the discharge air discharged from the compressor body can be arbitrarily changed and can be set, and the maximum amount of air can be obtained within the range of the load capacity of the motor according to the set pressure value. Further, the screw compressor is characterized in that the maximum rotational speed of the motor is preset and the rotational speed of the motor is controlled according to the amount of air used within the range of the set pressure value and the maximum rotational speed.
前記圧縮機本体から吐出される吐出空気の圧力を任意に変化させて設定できる吐出圧力設定装置と、該吐出圧力設定装置により設定された圧力に基づきモータの負荷容量の範囲内で前記モータの最高回転数を定める最高回転数制御装置とを備え、
前記吐出圧力設定装置で設定された圧力になるように制御されると共に、前記最高回転数の範囲内で使用空気量に応じて前記モータの回転数を制御することを特徴とするスクリュー圧縮機。 A compressor body that compresses air; a motor that drives the compressor body; an inverter that controls the number of revolutions of the motor; a pressure sensor that detects the pressure of the discharge air discharged from the compressor body; and In a screw compressor comprising a rotation speed control device that controls the operation of the inverter based on a pressure detection value of a pressure sensor to adjust the amount of air discharged from the compressor body,
A discharge pressure setting device capable of arbitrarily changing the pressure of the discharge air discharged from the compressor main body, and the highest motor within a load capacity range of the motor based on the pressure set by the discharge pressure setting device; A maximum speed control device for determining the speed,
The screw compressor is controlled so as to have a pressure set by the discharge pressure setting device, and the rotation speed of the motor is controlled in accordance with the amount of air used within the range of the maximum rotation speed.
前記圧縮機本体から吐出される吐出空気の圧力を定格圧力より低い圧力に設定可能に構成すると共に、定格圧力より低い圧力に設定された場合には、定格空気量以上の空気量が得られるように前記圧縮機本体の最高回転数を定め、前記設定圧力に制御すると共に、前記最高回転数の範囲内で需要機器の使用空気量に応じて前記モータの回転数を制御することを特徴とするスクリュー圧縮機。 A compressor main body that compresses air, a motor that drives the compressor main body, an inverter that controls the rotation speed of the motor, and a pressure sensor that detects the pressure of the discharge air discharged from the compressor main body. In the screw compressor
The pressure of the discharge air discharged from the compressor body can be set to a pressure lower than the rated pressure, and when the pressure is set to a pressure lower than the rated pressure, an air amount equal to or higher than the rated air amount can be obtained. The maximum number of rotations of the compressor body is determined and controlled to the set pressure, and the number of rotations of the motor is controlled in accordance with the amount of air used by demand equipment within the range of the maximum number of rotations. Screw compressor.
前記圧縮機本体の吐出圧力を所望の吐出圧力に任意に変更して設定可能な吐出圧力設定装置と、前記吐出圧力設定値に応じ、前記モータの負荷容量の範囲内で前記モータの最高回転数を予め設定しておく最高回転数制御装置とを備え、前記吐出圧力設定装置で任意に変更して設定される吐出圧力設定値が下げられるに従い前記予め設定される最高回転数の値が大きくなるように構成されていることを特徴とするスクリュー圧縮機。 In a screw compressor that includes a compressor body and a motor that drives the compressor body, and the number of revolutions of the compressor body is controlled according to the amount of air used by a demand device,
A discharge pressure setting device that can arbitrarily set the discharge pressure of the compressor body to a desired discharge pressure, and the maximum number of rotations of the motor within the load capacity range of the motor according to the discharge pressure setting value Is set in advance, and as the discharge pressure set value that is arbitrarily changed by the discharge pressure setting device is lowered, the preset maximum rotation value increases. A screw compressor characterized by being configured as described above.
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