CN114251277A - Method for monitoring operation condition of water pump by comparing water flow pulsation conditions before and after pump section - Google Patents
Method for monitoring operation condition of water pump by comparing water flow pulsation conditions before and after pump section Download PDFInfo
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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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- 230000010349 pulsation Effects 0.000 title claims abstract description 77
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 238000012544 monitoring process Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 16
- 238000012795 verification Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices 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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- Evolutionary Computation (AREA)
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- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
- Control Of 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
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. 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.
2. The method for monitoring the operating condition of the water pump by comparing the water flow pulsation conditions of the front and the rear of the pump section according to claim 1, which is characterized by further comprising the step (4) of performing a model test in the field and verifying the result of the 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.
3. The method for monitoring the operating conditions of the water pump by comparing the front and rear water flow pulsation conditions of the pump section as claimed in claim 1, wherein in the step (3), the pressure pulsation comparison data of the front and rear pressure pulsation measuring points of the guide vanes of the axial flow pump are in one-to-one correspondence with different operating conditions according to the obtained comparison and calculation data.
4. The method for monitoring the operating condition of the water pump by comparing the water flow pulsation before and after the pump section as claimed in 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111577329.0A CN114251277B (en) | 2021-12-22 | 2021-12-22 | Method for monitoring operation condition of water pump by comparing water flow pulsation conditions before and after pump section |
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| CN202111577329.0A CN114251277B (en) | 2021-12-22 | 2021-12-22 | Method for monitoring operation condition of water pump by comparing water flow pulsation conditions before and after pump section |
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| CN114251277A true CN114251277A (en) | 2022-03-29 |
| CN114251277B CN114251277B (en) | 2024-07-26 |
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