CN114251277A - A method for monitoring the operating condition of the water pump by comparing the water flow pulsation before and after the pump section - Google Patents

A method for monitoring the operating condition of the water pump by comparing the water flow pulsation before and after the pump section Download PDF

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CN114251277A
CN114251277A CN202111577329.0A CN202111577329A CN114251277A CN 114251277 A CN114251277 A CN 114251277A CN 202111577329 A CN202111577329 A CN 202111577329A CN 114251277 A CN114251277 A CN 114251277A
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pressure pulsation
pump
water pump
pulsation
monitoring
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CN114251277B (en
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李松柏
孙涛
成立
李加旭
卞新盛
贾璐
王晓森
花培舒
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Jiangsu Water Source Co ltd Of East Line Of South To North Water Transfer
Yangzhou University
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Jiangsu Water Source Co ltd Of East Line Of South To North Water Transfer
Yangzhou University
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0088Testing machines
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00Computer-aided design [CAD]
    • G06F30/20Design optimisation, verification or simulation

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Computer Hardware Design (AREA)
  • Evolutionary Computation (AREA)
  • Geometry (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)

Abstract

The invention relates to a method for monitoring the operating condition of a water pump by comparing the water flow pulsation conditions of the front and the back of a pump section, which comprises the following steps: (1) establishing an axial flow pump model with guide vanes, arranging a plurality of pressure pulsation measuring points in front of and behind the guide vanes of the axial flow pump, and installing pressure pulsation sensors at the positions of the pressure pulsation measuring points; (2) the axial-flow pump is operated under different working conditions, and pressure pulsation values of front and rear pressure pulsation test points of the guide vane under different working conditions of the water pump are obtained through the pressure pulsation sensor; the pressure pulsation sensor uploads a pressure pulsation value to a computer; (3) through comparison and calculation of a computer, measuring point data with the most obvious relationship between the front and back pressure pulsation change of the guide vane of the axial flow pump and the working condition is found, and a linear or nonlinear relationship between certain two points is found. According to the invention, a new monitoring data is found to reflect the operation condition of the water pump in real time, so that the accuracy of monitoring the water pump is greatly improved.

Description

Method for monitoring operation condition of water pump by comparing water flow pulsation conditions before and after pump section
Technical Field
The invention relates to a method for monitoring the operating condition of a water pump by comparing the water flow pulsation conditions of the front and the back of a pump section, belonging to the field of hydraulic engineering.
Background
The current mainstream water pump operation monitoring method mainly searches for time domain and frequency domain signals of water pump unit vibration, and the method is single, and the accuracy is to be improved. Therefore, how to construct other comprehensive parameters which change along with the change of the working condition of the water pump when the water pump unit operates, the operation state of the water pump is monitored by combining the vibration signals, and the efficiency of monitoring the water pump is effectively improved.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a method for monitoring the operation condition of a water pump by comparing the water flow pulsation conditions of the front and the back of a pump section.
The purpose of the invention is realized as follows: a method for monitoring the operation condition of a water pump by comparing the water flow pulsation conditions of the front and the back of a pump section is characterized by comprising the following steps:
(1) establishing an axial flow pump model with guide vanes, arranging a plurality of pressure pulsation measuring points in front of and behind the guide vanes of the axial flow pump, and installing pressure pulsation sensors at the positions of the pressure pulsation measuring points;
(2) the axial-flow pump is operated under different working conditions, and pressure pulsation values of front and rear pressure pulsation test points of the guide vane under different working conditions of the water pump are obtained through the pressure pulsation sensor; the pressure pulsation sensor uploads a pressure pulsation value to a computer;
(3) through comparison and calculation of a computer, measuring point data with the most obvious relationship between the front and back pressure pulsation change of the guide vane of the axial flow pump and the working condition is found, and a linear or nonlinear relationship between certain two points is found.
The method also comprises the step (4) of carrying out model test in the field and verifying the result of numerical calculation; and after verification, installing a pressure pulsation test point at a corresponding position in the actual operation of the water pump, and installing a pressure pulsation sensor at the position of the pressure pulsation test point.
And (3) according to the obtained comparison and calculation data, corresponding the pressure pulsation comparison data of the front and rear pressure pulsation measuring points of the guide vane of the axial flow pump to different working conditions one by one.
Pressure pulsation data are collected on an actual water pump, and the reliability and accuracy of relevant data are detected.
The method is advanced and scientific, and according to the method, a water pump model is established, and a plurality of pressure pulsation measuring points are arranged in front of and behind the water pump guide vane. The pressure pulsation data of the measuring points of different water pumps under different working conditions are tested, the measuring point data (certain linear or nonlinear relation) with the most obvious relation between the pressure pulsation change before and after the pump section and the working conditions is found through computer calculation, and the data obtained through experiments are verified on an experimental model.
And further, pressure pulsation sensors are installed at corresponding positions in front of and behind the water pump section model.
Further, different off-design conditions were simulated experimentally.
Further, the pressure pulsation data monitored by the sensor in real time is uploaded to a computer for comparison and calculation.
And further, according to the obtained comparison and calculation data, the pressure pulsation comparison data of the front and rear measuring points correspond to different working conditions one by one.
In one stroke, pressure pulsation data are collected on the actual water pump, and the reliability and accuracy of relevant data are detected.
Has the advantages that: the invention mainly aims to judge the running condition of the water pump by comparing the monitored water flow pulsation information before and after the pump section. According to the invention, a new monitoring data is found to reflect the operation condition of the water pump in real time, and the new monitoring data can be combined and complemented with the current mainstream vibration measurement method, so that the monitoring accuracy of the water pump is greatly improved. With the development of water pump technology, the monitoring of the running state of the water pump is increasingly and widely concerned. At present, the existing main means is to judge the condition of the water pump by collecting the vibration frequency and the vibration amplitude of the water pump unit during operation, and the means is single. A new element is found and combined with the vibration signal, and the complex operation condition of the water pump can be reflected.
Drawings
FIG. 1 shows pressure pulsation measurement points at the front and rear outer walls of a water pump according to the present invention;
in the figure: impeller 1, 2 stator vanes, 3 impeller front outer wall department pressure pulsation measurement station, 4 stator vane rear outer wall pressure pulsation measurement station.
Detailed Description
The invention is further described with reference to the accompanying drawings and the description thereof.
A method for monitoring the operation condition of a water pump by comparing the water flow pulsation conditions of the front and the back of a pump section comprises the following steps:
(1) establishing an axial flow pump model with guide vanes, arranging a plurality of pressure pulsation measuring points in front of and behind the guide vanes of the axial flow pump, and installing pressure pulsation sensors at the positions of the pressure pulsation measuring points;
(2) the axial-flow pump is operated under different working conditions, and pressure pulsation values of front and rear pressure pulsation test points of the guide vane under different working conditions of the water pump are obtained through the pressure pulsation sensor; the pressure pulsation sensor uploads a pressure pulsation value to a computer;
(3) through comparison and calculation of a computer, measuring point data with the most obvious relationship between the front and back pressure pulsation change of the guide vane of the axial flow pump and the working condition is found, and a linear or nonlinear relationship between certain two points is found.
The method also comprises the step (4) of carrying out model test in the field and verifying the result of numerical calculation; and after verification, installing a pressure pulsation test point at a corresponding position in the actual operation of the water pump, and installing a pressure pulsation sensor at the position of the pressure pulsation test point.
And (3) according to the obtained comparison and calculation data, corresponding the pressure pulsation comparison data of the front and rear pressure pulsation measuring points of the guide vane of the axial flow pump to different working conditions one by one.
Pressure pulsation data are collected on an actual water pump, and the reliability and accuracy of relevant data are detected.
According to the invention, the method is suitable for the axial flow pump with the guide vane, and the guide vane model is established firstly; and then calculating the pulsation value of the front and rear test points of the guide vane under different water pump working conditions. And then the linear or nonlinear relation between certain two points is found through computer comparison. And carrying out a model test on the spot and verifying the result of numerical calculation. And installing test points at corresponding positions in the actual operation of the water pump.

Claims (4)

1.一种通过对比泵段前后水流脉动情况监测水泵运行工况的方法,其特征是,包括以下步骤:1. a method for monitoring water pump operating conditions by comparing the water flow pulsation situation before and after the pump section, is characterized in that, comprises the following steps: (1)建立带导叶的轴流泵模型,在轴流泵的导叶前后,设置若干压力脉动测点,并在压力脉动测点位置安装压力脉动传感器;(1) Establish a model of an axial flow pump with guide vanes, set up several pressure pulsation measuring points before and after the guide vanes of the axial flow pump, and install a pressure pulsation sensor at the position of the pressure pulsation measuring point; (2)将轴流泵在不同工况条件下运行,通过压力脉动传感器获得不同水泵工况条件下,导叶前后压力脉动测试点的压力脉动值;压力脉动传感器将压力脉动值上传至计算机;(2) Run the axial flow pump under different working conditions, and obtain the pressure pulsation value of the pressure pulsation test point before and after the guide vane under different pump working conditions through the pressure pulsation sensor; the pressure pulsation sensor uploads the pressure pulsation value to the computer; (3)通过计算机比对和计算,找到轴流泵的导叶前后压力脉动变化与工况的关系最明显的测点数据,找到某两个点之间存在的线性或非线性关系。(3) Through computer comparison and calculation, find the measurement point data with the most obvious relationship between the pressure pulsation change before and after the guide vane of the axial flow pump and the working conditions, and find the linear or nonlinear relationship between certain two points. 2.根据权利要求1所述的一种通过对比泵段前后水流脉动情况监测水泵运行工况的方法,其特征是,还包括步骤(4),实地进行模型试验,验证数值计算的结果;验证无误后,在实际水泵运行中安装相应位置的压力脉动测试点,并在压力脉动测点位置安装压力脉动传感器。2. A method for monitoring the operating conditions of the water pump by comparing the water flow pulsation before and after the pump section according to claim 1, wherein the method further comprises step (4), conducting model tests on the spot to verify the results of the numerical calculation; verifying After correct, install the pressure pulsation test point at the corresponding position in the actual pump operation, and install the pressure pulsation sensor at the position of the pressure pulsation measurement point. 3.根据权利要求1所述的一种通过对比泵段前后水流脉动情况监测水泵运行工况的方法,其特征是,步骤(3)中,根据得到的对比和计算数据,将轴流泵的导叶前后压力脉动测点压力脉动对比数据与不同的工况一一对应。3. A method for monitoring the operating conditions of the water pump by comparing the water flow pulsation before and after the pump section according to claim 1, wherein in step (3), according to the obtained comparison and calculation data, the axial flow pump The pressure pulsation comparison data of the pressure pulsation measuring points before and after the guide vane correspond to different working conditions one by one. 4.根据权利要求2所述的一种通过对比泵段前后水流脉动情况监测水泵运行工况的方法,其特征是,在实际水泵上采集压力脉动数据,并检测相关数据地可靠性与准确性。4. A method for monitoring the operating condition of the water pump by comparing the water flow pulsation before and after the pump section according to claim 2, wherein the pressure pulsation data is collected on the actual water pump, and the reliability and accuracy of the relevant data are detected. .
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