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Method for operating a pump that is driven by an electric motor in a power-optimized manner in the event of low volumetric flow rates

A volume flow, power optimization technology, applied in the direction of pump, pump control, pump test, etc., can solve problems such as mismatching equipment hydraulic requirements

Active Publication Date: 2013-09-11
WILO SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A disadvantage of this type of characteristic curve adjustment is that the setpoint head of the pump does not match the actual hydraulic demand of the system with closed valves in the system, that is to say with a volume flow equal to zero

Method used

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  • Method for operating a pump that is driven by an electric motor in a power-optimized manner in the event of low volumetric flow rates
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  • Method for operating a pump that is driven by an electric motor in a power-optimized manner in the event of low volumetric flow rates

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Embodiment Construction

[0034] figure 1 H / Q curve showing a hydraulic system with an electrically driven pump figure 1 , the hydraulic system is here a heating device. Reference numeral 2 marks the operating point on the characteristic curve at the maximum rotational speed of the pump. During normal operation, the pump is adjusted on a Δp-v characteristic curve K, according to which the rated head H is adjusted linearly with the volumetric flow demand Q of the system. At the maximum rotational speed of the pump, the maximum volume flow Q_max is obtained on the characteristic curve K. The rated head H at this time is marked with H_soll and is equal to the rated head of the characteristic curve.

[0035] If the operating point of the heating device moves along the characteristic curve K in the direction of a smaller volume flow Q, and the volume flow Q reaches a reference value Q_ref, which is approximately 5% of the maximum volume flow Q_ref, for example 150 l / h, then the rated head H of the pump...

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Abstract

The invention relates to a method for operating a pump that is driven by an electric motor in a hydraulic system in a power-optimized manner in the event of very low volumetric flow rates (Q). The target delivery head (H) of the pump is regulated along a preset characteristic curve (K) dependent on the volumetric flow rate (Q). The target delivery head (H) is reduced compared to the preset characteristic curve (K) if the volumetric flow rate (Q) falls short of a reference value (Q_ref) that is maximally a tenth of the maximum volumetric flow rate (Q_max) on the characteristic curve (K). The reduction is carried out as long as the volumetric flow rate lies below the volumetric flow rate reference value (Q_ref) and a delivery head minimum value (H_min) has not been reached. The invention further relates to a pump that is driven by an electric motor, comprising a control and regulating electronic system that is equipped to carry out the method.

Description

technical field [0001] The invention relates to a method for power-optimized operation of an electrically driven pump in a hydraulic system at very low volume flows, wherein the setpoint head of the pump is adjusted along a characteristic curve as a function of the volume flow. Furthermore, the invention relates to an electrically driven pump with control and regulation electronics designed to carry out the method according to the invention. Finally, the invention relates to a computer program product with instructions for carrying out the method according to the invention, when said method is carried out in the control and regulation electronics of the pump. Background technique [0002] The adjustment of the pump along a predetermined characteristic curve is known. In this case, a so-called Δp-c characteristic curve is used, in which the nominal head of the pump remains constant with respect to the volume flow. Furthermore, so-called Δp-v characteristic curves are known,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B49/20F04C14/08F04D15/00
CPCF04B49/20F04B17/03F04B49/065F04B2203/02F04B2205/09F04B2207/0411F04B2207/0412F04C14/08F04D15/0066
Inventor F·阿尔贝斯E·格罗塞-韦斯特霍夫
Owner WILO SE