CN108105080B - For the detection method of cavitation, device, storage medium and processor - Google Patents
For the detection method of cavitation, device, storage medium and processor Download PDFInfo
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- CN108105080B CN108105080B CN201711298054.0A CN201711298054A CN108105080B CN 108105080 B CN108105080 B CN 108105080B CN 201711298054 A CN201711298054 A CN 201711298054A CN 108105080 B CN108105080 B CN 108105080B
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- 238000001514 detection method Methods 0.000 title claims abstract description 52
- 239000012530 fluid Substances 0.000 claims abstract description 21
- 238000004364 calculation method Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000010183 spectrum analysis Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241001125929 Trisopterus luscus Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The present invention provide it is a kind of for the detection method of cavitation, device, storage medium and processor, wherein this method comprises: obtain motor current detection value；The inlet pressure detected value of fluid inlet where obtaining the pump being connected on the motor；The outlet pressure detected value of fluid outlet where obtaining the pump being connected on the motor；It is compared to determine whether the pump occurs cavitation with the standard electrical-power value under the electrical power computation model using the current detection value obtained in real time, inlet pressure detected value and outlet pressure detected value as the real-time electric power value that calculation of initial value obtains according to preset electrical power computation model.The device, storage medium and processor are all based on preceding method to realize, the present invention, which has well solved existing detection means, has that implementation is big, implementation cost is high.
Description
Technical field
The present invention relates to machinery fields, more particularly to a kind of for the detection method of cavitation, device, storage medium and place
Manage device.
Background technique
Existing patent (publication number CN102939463B) discloses a kind of method for detecting the cavitation in pump, and this method passes through
The real-time operating current data from the motor driven to pump are repeatedly received, current spectrum is generated by current data,
And current data is analyzed in a pair of of feature band of current spectrum.Further, internal as this feature frequency band
The function of current data repeatedly determines fault signature, is based on fault signature and dynamic benchmark feature, repeatedly determines that failure refers to
Mark, fault indices are compared with reference index, identify pump compared between current failure index based on reference index
In cavitation conditions.
Discovery is studied and is used, the prior art has the disadvantage that since it is point based on the frequency spectrum to electric current
Result is analysed to realize the judgement of cavitation conditions, is needed to waveform sampling, therefore it has on realizing algorithm and hardware device used
Higher complexity, the most inconvenient is that it cannot be realized on PLC (Programmable Logic Controller).
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of detection sides for cavitation
Method, device, storage medium and processor, for solving the problems, such as existing detection means, in the presence of implementing, big, implementation cost is high.
In order to achieve the above objects and other related objects, the present invention provides following scheme:
First aspect
A kind of detection method for generation cavitation in engine plunger pump system, comprising: obtain the current detecting of motor
Value；The inlet pressure detected value of fluid inlet where obtaining the pump being connected on the motor；Acquisition is connected to described electronic
The outlet pressure detected value of fluid outlet where pump on machine；Described in being obtained in real time according to preset electrical power computation model
The real-time electric power value that current detection value, inlet pressure detected value and outlet pressure detected value are obtained as calculation of initial value with
Standard electrical-power value under the electrical power computation model is compared to determine whether the pump occurs cavitation.
Testing goal can be realized by the sizes values of electric current in technical solution provided by the invention, adopts compared to the prior art
It is more simple with the spectrum analysis mode of electric current；The acquisition modes of parameter required for detection process need to only be passed by simple electric current
Sensor, process instrumentation can be obtained, simpler compared with prior art in hardware realization, in addition, this programme is by calculating
Carry out judging result, therefore algorithm can be written in PLC by programming language and be can be realized by it.In short, this programme is compared to existing
It is more simple in software and hardware realization there is technology, and implementation cost is lower.
Second aspect
A kind of detection device for generation cavitation in engine plunger pump system, comprising: the first data acquisition unit is used for
Obtain the current detection value of motor；Second data acquisition unit, for stream where obtaining the pump being connected on the motor
The inlet pressure detected value of body entrance；Third data acquisition unit, for stream where obtaining the pump being connected on the motor
The outlet pressure detected value of body outlet；Detection unit, for it will be obtained in real time according to preset electrical power computation model described in
The real-time electric power value that current detection value, inlet pressure detected value and outlet pressure detected value are obtained as calculation of initial value with
Standard electrical-power value under the electrical power computation model is compared to determine whether the pump occurs cavitation.
The third aspect
A kind of storage medium, which is characterized in that the storage medium includes the program of storage, wherein transported in described program
Equipment executes above-mentioned detection method where controlling the storage medium when row.
Fourth aspect
A kind of processor, which is characterized in that the processor is for running program, wherein described program executes when running
Above-mentioned detection method.
Detailed description of the invention
Fig. 1 is the attachment structure schematic diagram in existing engine plunger pump system between motor and pump.
Provided by the present invention for the flow chart of the detection method of generation cavitation in engine plunger pump system according to Fig. 2.
Provided by the present invention for the frame principles of the detection device of generation cavitation in engine plunger pump system according to Fig. 3
Figure.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.It should be noted that in the absence of conflict, following embodiment and implementation
Feature in example can be combined with each other.
It should be noted that illustrating the basic structure that only the invention is illustrated in a schematic way provided in following embodiment
Think, only shown in schema then with related component in the present invention rather than component count, shape and size when according to actual implementation
Draw, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its assembly layout kenel
It is likely more complexity.
Description of Related Art
See Fig. 1, is the attachment structure schematic diagram in existing engine plunger pump system between motor and pump.
As shown, in the engine plunger pump system 1, including motor 3 and pump 2, motor 3 is driven by Mechanical Driven
Dynamic 2 work of pump, has fluid inlet 21 and fluid outlet 22 on pump.
The present invention detects the current value of motor in above-mentioned prior art basis, in the input terminal 31 of motor, and
Inlet pressure level and exit pressure levels, the data for then detecting these are detected in the fluid inlet 21 and fluid outlet 22 of pump
It is input in the detection model pre-established as initial value to conclude whether pump has occurred cavitation.
The specific implementation of above scheme is described in detail below.
Detection model establishes thinking.
1, the selection of parameter: the current value of motor indicates with " I ", inlet pressure level " Pin " table of fluid inlet
Show, the exit pressure levels of fluid outlet are indicated with " Pout ".
2, the power input of system and power output analysis: the input of engine plunger pump system power is electrical power, wherein function
Rate output is mainly 3 parts:
The first, generator loss；
The second, mechanical loss is pumped；
Third, pump trandfer fluid acting.
Wherein, the loss of electric machine is mainly copper loss, iron loss, mechanical friction, this part and electric current are positively correlated, but are accounted for smaller.
Wherein, pump mechanical loss is mainly frictional dissipation.
Wherein, pump trandfer fluid acting W=(Pout-Pin) * V, when cavitation occurs for pump, it is attached to drop into 0 from rated value by V
Closely, the variation of this part is maximum.
Current of electric and electrical power are positively correlated in systems, and the acting of pump fluid conveying is reduced when cavitation occurs for pump, pump acting
It reduces, electronic electric power reduces.Electrical power reduction shows on electric current to be exactly that electric current reduces.
3, the foundation of detection model: based on above-mentioned analysis, following computation model is established:
Electrical power=loss+(outlet pressure-inlet pressure) * metered flow, wherein the calculating of loss, it can be according to upper
Analysis is stated to be estimated.Motor determines electrical power under frequency mode and is proportional to electric current, pumps outlet pressure and entrance in actual operation
Pressure can change with operating condition, detect its value at any time.When electrical power is continuously significantly less than " loss+(outlet pressure-inlet pressure) *
When metered flow ", it can think that cavitation has occurred in pump, system external output alarms and takes relevant action.
Wherein, the calculating in model about loss can be obtained by way of detection, such as can detecte motor
Electric current when idle running as generator loss, and calculates pump in zero load to calculate the power under idle running
Electric current carry out computed losses.
Based on above-mentioned thinking, the present invention has following implementation.
Embodiment one
Fig. 2 is seen, for according to provided by the invention a kind of for the detection method of cavitation to occur in engine plunger pump system
Flow chart, as shown, being somebody's turn to do, detection method includes the following steps:
S101 obtains the current detection value of motor；
S102, the inlet pressure detected value of fluid inlet where obtaining the pump being connected on the motor；
S103, the outlet pressure detected value of fluid outlet where obtaining the pump being connected on the motor；
S104 detects the current detection value obtained in real time, inlet pressure according to preset electrical power computation model
The real-time electric power value that value and outlet pressure detected value are obtained as calculation of initial value under the electrical power computation model
Standard electrical-power value is compared to determine whether the pump occurs cavitation.
In specific implementation, to step S101, implementation between S102, S103 sequence without limitation, for example, it can be simultaneously
Row executes, and perhaps sequentially executes in the order described above or according to step S102, S101, S103 sequence execution etc..
Wherein, the electrical power computation model are as follows:
Electrical power=loss+(outlet pressure-inlet pressure) * metered flow, wherein it is described loss be generator loss and
The sum of mechanical loss is pumped, the metered flow is the metered flow of pump.
As a kind of preferred embodiment, after the real-time electric power value is calculated, determine whether the pump occurs
The method of cavitation includes:
Judge the difference of the real-time electric power value and the standard electrical-power value beyond the duration of preset threshold whether
In preset value, if it is not, determining that cavitation occurs for the pump；If so, determining that the pump is normal.
Embodiment two
See Fig. 3, provides according to the present invention a kind of for the frame of the detection device of cavitation to occur in engine plunger pump system
Frame schematic diagram, as shown, the detection device 4 includes the first data acquisition unit 41, the second data acquisition unit 42, third number
According to acquisition unit 43 and detection unit 44, wherein the first data acquisition unit 41 is used to obtain the current detection value of motor；The
The inlet pressure detected value of fluid inlet where two data acquisition units 42 are used to obtain the pump being connected on the motor；The
The outlet pressure detected value of fluid outlet where three data acquisition units 43 are used to obtain the pump being connected on the motor；Inspection
Unit 44 is surveyed to be used for the current detection value obtained in real time, inlet pressure detected value according to preset electrical power computation model
And the real-time electric power value that obtains as calculation of initial value of outlet pressure detected value and the mark under the electrical power computation model
Quasi- electric power value is compared to determine whether the pump occurs cavitation.
Wherein, the electrical power computation model are as follows: electrical power=loss+(outlet pressure-inlet pressure) * metered flow,
The loss is the sum of generator loss and pump mechanical loss, and the metered flow is the metered flow of pump.
Embodiment is selected as a kind of, the detection unit can also include a judging unit, for single in the detection
Member is calculated after the real-time electric power value, judges the real-time electric power value and under the electrical power computation model
Whether duration of the difference of standard electrical-power value beyond preset threshold be in preset value, if it is not, determining that cavitation occurs for the pump；If
It is to determine that the pump is normal.
Embodiment three
The present embodiment additionally provides a kind of storage medium according to the present invention, wherein the storage medium includes the journey of storage
Sequence, wherein equipment where controlling the storage medium in described program operation executes any one of above embodiment one
Detection method described in embodiment.
Embodiment four
The present embodiment additionally provides a kind of processor according to the present invention, wherein and the processor is used to run program,
In, detection method described in any one of above embodiment one embodiment is executed when described program is run.
In a particular application, the processor can use PLC.
In conclusion the present invention has following significant technical effect compared with the prior art:
Testing goal can be realized by the sizes values of electric current in technical solution provided by the invention, adopts compared to the prior art
It is more simple with the spectrum analysis mode of electric current；The acquisition modes of parameter required for detection process need to only be passed by simple electric current
Sensor, process instrumentation can be obtained, simpler compared with prior art in hardware realization, in addition, this programme is by calculating
Carry out judging result, therefore algorithm can be written in PLC by programming language and be can be realized by it.In short, this programme is compared to existing
It is more simple in software and hardware realization there is technology, and implementation cost is lower.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (6)
1. a kind of for the detection method of cavitation to occur in engine plunger pump system characterized by comprising
Obtain the current detection value of motor；
The inlet pressure detected value of fluid inlet where obtaining the pump being connected on the motor；
The outlet pressure detected value of fluid outlet where obtaining the pump being connected on the motor；
The current detection value obtained in real time, inlet pressure detected value and outlet are pressed according to preset electrical power computation model
The real-time electric power value that power detected value is obtained as calculation of initial value and the standard electrical-power under the electrical power computation model
Value is compared to determine whether the pump occurs cavitation；The electrical power computation model are as follows:
Electrical power=loss+(outlet pressure-inlet pressure) * metered flow；
Wherein, the loss is the sum of generator loss and pump mechanical loss, and the metered flow is the metered flow of pump.
2. according to claim 1 for the detection method of cavitation to occur in engine plunger pump system, it is characterised in that:
It is calculated after the real-time electric power value, determines that the step of whether pump occurs cavitation includes:
Judge whether the difference of the real-time electric power value and the standard electrical-power value is being preset beyond the duration of preset threshold
In value, if it is not, determining that cavitation occurs for the pump；If so, determining that the pump is normal.
3. a kind of for the detection device of cavitation to occur in engine plunger pump system characterized by comprising
First data acquisition unit, for obtaining the current detection value of motor；
Second data acquisition unit, the inlet pressure detection for fluid inlet where obtaining the pump being connected on the motor
Value；
Third data acquisition unit, the outlet pressure detection for fluid outlet where obtaining the pump being connected on the motor
Value；
Detection unit, for according to preset electrical power computation model by the current detection value obtained in real time, inlet pressure
The real-time electric power value that detected value and outlet pressure detected value are obtained as calculation of initial value in the electrical power computation model
Under standard electrical-power value be compared to determine whether the pump occurs cavitation；
The electrical power computation model are as follows: electrical power=loss+(outlet pressure-inlet pressure) * metered flow, the loss are
The sum of generator loss and pump mechanical loss, the metered flow are the metered flow of pump.
4. according to claim 3 for the detection device of cavitation to occur in engine plunger pump system, which is characterized in that also
Include:
Judging unit, for judging the real-time electric work after the real-time electric power value is calculated in the detection unit
Whether rate value and the difference of the standard electrical-power value under the electrical power computation model are being preset beyond the duration of preset threshold
In value, if it is not, determining that cavitation occurs for the pump；If so, determining that the pump is normal.
5. a kind of storage medium, which is characterized in that the storage medium includes the program of storage, wherein run in described program
When control the storage medium where equipment perform claim require any one of 1 to 2 described in detection method.
6. a kind of processor, which is characterized in that the processor is for running program, wherein right of execution when described program is run
Benefit require any one of 1 to 2 described in detection method.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711298054.0A CN108105080B (en) | 2017-12-08 | 2017-12-08 | For the detection method of cavitation, device, storage medium and processor |
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| CN201711298054.0A CN108105080B (en) | 2017-12-08 | 2017-12-08 | For the detection method of cavitation, device, storage medium and processor |
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| CN108105080B true CN108105080B (en) | 2019-06-07 |
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| CN114922827A (en) * | 2022-04-08 | 2022-08-19 | 宁波兰宁石化科技有限公司 | A real-time monitoring method of centrifugal pump cavitation |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56135787A (en) * | 1980-03-26 | 1981-10-23 | Chosei Sasa | Method and apparatus for transporting liquid in boilng stage or in vicinity of boiling state |
| US6757665B1 (en) * | 1999-09-28 | 2004-06-29 | Rockwell Automation Technologies, Inc. | Detection of pump cavitation/blockage and seal failure via current signature analysis |
| US6709240B1 (en) * | 2002-11-13 | 2004-03-23 | Eaton Corporation | Method and apparatus of detecting low flow/cavitation in a centrifugal pump |
| US9777748B2 (en) * | 2010-04-05 | 2017-10-03 | Eaton Corporation | System and method of detecting cavitation in pumps |
| US10465679B2 (en) * | 2013-10-11 | 2019-11-05 | Eaton Intelligent Power Limited | Electric motor driven pump |
| CN104806509A (en) * | 2015-05-05 | 2015-07-29 | 上海阿波罗机械股份有限公司 | System for testing cavitation performance of main water feed pump of nuclear power station |
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