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Method and system for detecting cavitation of pump and frequency converter

A frequency converter, cavitation technology, applied in the field of methods and systems, to achieve the effect of eliminating demand and reliable detection

Active Publication Date: 2010-06-23
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem with this method is also that additional measurement sensors or transducers are required

Method used

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  • Method and system for detecting cavitation of pump and frequency converter
  • Method and system for detecting cavitation of pump and frequency converter
  • Method and system for detecting cavitation of pump and frequency converter

Examples

Experimental program
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Embodiment Construction

[0021] figure 1 The basic structure of a pump driven by a frequency converter is shown. The frequency converter 2 is connected to a supplying network 1 via a three-phase cable. The frequency converter is also connected to the motor 3 which in turn is mechanically connected to the pump 4 . Frequency converters control the rotation of motors and pumps in a desired manner. The frequency converter is also connected to the automation system via the interface 5 . An automation system can be a higher level controller that controls the process to which the pump is associated. Thus, the automation interface gives instructions for the operation of the pump, which is managed by the frequency converter. exist figure 1 In , all measurements of the system are omitted, and the motor and the pumping process are controlled in a sensorless manner.

[0022] figure 2 is a block diagram presenting the process performed in the present invention. In the present invention, the frequency conv...

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Abstract

A method and a system for controlling a pump by means of a frequency converter. The method involves controlling a pump (4) with a frequency converter (2), where the frequency converter feeds a motor (3) connected to drive the pump. A torque estimate (Test) and / or a rotational speed estimate (nest) of the motor are provided from the frequency converter. Features (1, 2, 3, 4) indicating cavitation or likelihood (1, 2, 3, 4) of cavitation of the pump (4) and / or reverse flow of the pump (4) are formed using the provided estimates (Test, nest). The cavitation or likelihood of cavitation is detected from the formed features (1, 2, 3, 4). An estimated volumetric flow is estimated from direct components of the estimates (1, 2, 3, 4).

Description

technical field [0001] The invention relates to a method and a system for detecting cavitation in a pump, in particular to a method and a system with which cavitation in a pump controlled by a frequency converter can be detected without additional measurements . Background technique [0002] A known problem with pumps is their tendency to cavitate. Cavitation is the situation in which the suction pressure of the pump drops below the point at which the liquid to be pumped begins to vaporize, ie falls below the vapor pressure of the liquid. This phenomenon produces air bubbles that collapse abruptly once they enter the higher pressure regions of the pump. The sudden change from the gas phase back to the liquid phase causes a sudden pressure change which causes audible noise and can damage the mechanical parts of the pump. [0003] The detection of cavitation or the possibility of cavitation is an important aspect related to the pumping process. If cavitation, or the risk o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/56
CPCF04D15/0066F04D29/669F04D15/0088
Inventor 泰罗·阿霍宁耶罗·阿霍拉
Owner ABB (SCHWEIZ) AG
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