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Method for adjusting rotational speed of centrifugal pump

A centrifugal pump and rotational speed technology, which is applied in pump control, non-variable pumps, machines/engines, etc., can solve the problems that the adjustment cannot lead to satisfactory results, the mathematical relationship changes, and the tedious adjustment is outdated.

Pending Publication Date: 2021-05-25
KSB AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These regulator types are durable, especially under different operating conditions, and render obsolete the previously discussed tedious adjustment of regulator parameters
But a disadvantageous limitation of this type of regulator is that they can currently only be used in closed hydraulic circuits
For open loops that sometimes overcome geodesic heights, the mathematical relationship between the parameters changes and adjustments do not lead to satisfactory results

Method used

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  • Method for adjusting rotational speed of centrifugal pump
  • Method for adjusting rotational speed of centrifugal pump
  • Method for adjusting rotational speed of centrifugal pump

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Embodiment Construction

[0025] The core idea of ​​the invention is to use a new type of regulator for speed regulation of a centrifugal pump. Unlike the prior art, it is proposed not to use a PI or PID controller at all, but instead to use a so-called affine controller, which uses the affine law to determine the manipulated value / target value and is therefore based on the rotational speed of the centrifugal pump Power of two relationship with the resulting delivery height.

[0026] For a description of the functionality of this affine regulator, see figure 1 . The delivery height is plotted against the set pump rotational speed in the diagram representation. The diagram shows here in detail the quadratic relationship between the conveying height H and the rotational speed n, which can be expressed by the equation

[0027] (Equation 1)

[0028] to describe. also, figure 1 exemplarily shows the actual-rotational speed n ist and target-speed n soll . Due to the relationship of the second pow...

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Abstract

The invention relates to a method for adjusting the rotational speed of a centrifugal pump, in which a controller of a pump control device calculates a target rotational speed of a pump drive, taking into account a target delivery height and an actual delivery height as well as an actual rotational speed, in order to determine the adjustment value, the regulator is used to calculate the adjustment value at least on the basis of a component of the affine law, in particular a second power relationship between the assumed rotational speed and the delivery height.

Description

[0001] This application is a divisional application of the invention patent application with the application number 201880016825.9, the application date is March 07, 2018, and the invention title is "Method for Adjusting the Speed ​​of a Centrifugal Pump". technical field [0002] The invention relates to a method for regulating the rotational speed of a centrifugal pump operated in a hydraulic circuit, wherein a regulator of the pump control determines the pump drive taking into account the target delivery height and the actual delivery height as well as the actual rotational speed The target of the piece - the rotational speed. Background technique [0003] Today's speed-regulated centrifugal pumps of the prior art mainly use PI controllers for determining the target speed. With the P-part it is possible to determine how quickly the pump reaches its target value. With the help of the I-part, it is possible to adjust how residual dynamic control deviations are to be elimin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D15/00
CPCF04D15/0066F04D15/00
Inventor M.埃克尔J.舒莱雷尔
Owner KSB AG
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