JPWO2020212330A5

JPWO2020212330A5 -

Info

Publication number: JPWO2020212330A5
Application number: JP2021562026A
Authority: JP
Publication date: 2024-07-11

Description

ポンプの周波数応答を決定するための代替または追加の動作パラメータとしては、ポンプ圧力、例えば特にポンプの吐出圧が好適である。ここで、機械的振動は、信号形状にも反映される。ポンプの吐出圧は、例えば、既存の圧力センサによって決定可能であり、信号変換、特に高速フーリエ変換によって、その周波数スペクトルに変換され得る。 As an alternative or additional operating parameter for determining the frequency response of the pump, the pump pressure, for example in particular the pump discharge pressure , is suitable, where the mechanical vibrations are also reflected in the signal shape. The pump discharge pressure can be determined, for example, by an existing pressure sensor and can be converted into its frequency spectrum by a signal transformation, in particular a fast Fourier transformation.

モータ電流とは別に、または、これに加えて、ポンプの吐出圧の信号も調べることができる。ここでも、モータ電流と同様に、高速フーリエ変換によって、対応する共振周波数に関する周波数スペクトルが分析され評価される。吐出圧は、例えばポンプの圧力センサ等を用いるか、動作点の推定によって計算できる。 Apart from or in addition to the motor current, the signal of the pump discharge pressure can also be examined. Here, as with the motor current, the frequency spectrum for the corresponding resonant frequencies is analyzed and evaluated by means of a fast Fourier transformation. The discharge pressure can be calculated, for example, using a pressure sensor of the pump or by operating point estimation.

信号品質を向上させるために、両方の信号（吐出圧およびモータ電流）を、センサデータフュージョンによってマージ（merge）することもできる。これが不可能な場合、電流および圧力信号を個々に評価することもできる。センサフュージョンに関して、例えば例えば個々の信号値を上述のように評価し、次に重み付けによってマージすることができる。個別に評価された信号の個々の結果に異なる重みを付けることができる範囲を規定することも考えられる。例えば例えば、１０～２００Ｈｚの周波数範囲のモータ電流の評価結果が使用され、一方、より高い周波数の吐出圧の評価結果が考慮される。 To improve the signal quality, both signals ( discharge pressure and motor current) can also be merged by sensor data fusion. If this is not possible, the current and pressure signals can also be evaluated individually. For sensor fusion, for example, the individual signal values can be evaluated as described above and then merged by weighting. It is also conceivable to define a range in which the individual results of the individually evaluated signals can be weighted differently. For example, the evaluation results of the motor current in the frequency range of 10 to 200 Hz are used, while the evaluation results of the discharge pressure at higher frequencies are taken into account.

Claims

1. A method for preventing or reducing mechanical vibrations during pump operation of a pump, including a centrifugal pump, comprising :
a first step in which a frequency converter and a pump controller are provided;
a second step of detecting mechanical vibrations of the pump by the pump controller detecting at least one signal of a pump operating parameter and examining the at least one signal for signal vibrations;
a third step of reducing the detected mechanical vibrations by varying the rotational speed of the pump by the frequency converter;
Including,
The method, characterized in that the second and third steps are repeatedly performed while varying the rotational speed of the pump within a predefined tolerance range with a maximum possible deviation for a particular rotational speed of the pump in order to identify a pump rotational speed at which the amplitude of mechanical vibrations detected in the frequency spectrum of the at least one signal is minimized.

2. The method of claim 1, wherein the frequency spectrum of said at least one signal is calculated by means of a Fast Fourier Transform.

The method of claim 1 or 2, characterized in that the at least one signal examined corresponds to a motor current of a pump drive.

4. The method according to claim 1, wherein the at least one signal to be investigated corresponds to a discharge pressure of the pump, the discharge pressure being determined at least one of by measurement using a pressure sensor and by estimation of an operating point of the pump defined by a discharge flow rate and a total head during operation of the pump .

The method according to any one of claims 1 to 4, characterized in that the at least one signal consists of a signal corresponding to a motor current of a pump drive and a signal corresponding to a discharge pressure of the pump, and in the third step, a first mechanical vibration of the pump detected for the signal corresponding to the motor current of the pump drive or a second mechanical vibration of the pump detected for the signal corresponding to the discharge pressure of the pump is used depending on the rotational speed of the pump.

6. The method of claim 5, further comprising using the first mechanical vibration when the rotational speed of the pump is relatively low and using the second mechanical vibration when the rotational speed of the pump is relatively high.

The method according to any one of claims 1 to 6, characterized in that the method is repeatedly performed while arbitrarily varying the rotational speed of the pump in order to identify at least one anti-resonance of the pump and to operate the pump at said anti- resonance .

The method according to any one of claims 1 to 7, characterized in that the frequencies of the identified resonant vibrations are stored and the method is repeatedly performed in order to detect changes in the frequencies of the identified resonant vibrations.

9. The method of claim 8, wherein the pump is capable of detecting at least one of material wear of the pump and any damage to the structure of the pump based on the detected change in frequency.

A pump arrangement comprising a frequency converter and a pump control device configured to carry out the method according to any one of claims 1 to 9, the pump arrangement being a centrifugal pump including a drainage pump, a solids pump for transporting a liquid having a solid portion or a feed pump.

11. Use of the pump arrangement according to claim 10 as a drainage pump, a solids pump for transporting a liquid having a solid portion or a feed pump.