CN206175252U - Critical cavitation point detection device of centrifugal pump - Google Patents
Critical cavitation point detection device of centrifugal pump Download PDFInfo
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- CN206175252U CN206175252U CN201621175592.1U CN201621175592U CN206175252U CN 206175252 U CN206175252 U CN 206175252U CN 201621175592 U CN201621175592 U CN 201621175592U CN 206175252 U CN206175252 U CN 206175252U
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- centrifugal pump
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- inlet pressure
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Abstract
The utility model discloses a critical cavitation point detection device of centrifugal pump, including connecting imported valve and the inlet pressure changer on water intake pipe, connect outlet valve, flowmeter and outlet pressure changer on the outlet pipe way, the connection is at motor and the rotational speed and torque sensor between the centrifugal pump of awaiting measuring to and multifunctional data acquisition module and industrial computer, imported valve, inlet pressure changer, outlet valve, flowmeter, outlet pressure sensor and rotational speed and torque sensor passing signal line are connected with the multifunctional data acquisition module, and the multifunctional data acquisition module is passed through the ethernet and is connected with the industrial computer, the preferred pneumatic control valve door of imported valve and outlet valve. The utility model discloses can increase substantially automatic level, measuring accuracy and efficiency that the critical cavitation point of centrifugal pump detected.
Description
Technical field
The utility model belongs to cavitation performance of centrifugal pump experimental technique field, and in particular to a kind of centrifugal pump critical cavitation point
Detection means.
Background technology
Centrifugal pump in the course of the work, often produces cavitation phenomenons because of the decline of fluid local pressure in pump.Cavitation
Produced shock wave has detrimental effect to the part or even pump case of centrifugal pump, can cause the centrifugal pump can not normal work when serious
Make.For this reason, it is necessary to determine the critical cavitation point of centrifugal pump, that is, critical NPSH by cavitation experiment.
At present, determine that the conventional cavitation experiment method of critical cavitation point is that manually test mode realizes that it is substantially former
Reason is by increasing the resistance on centrifugal pump inlet pipeline to change inlet pressure level, while by changing the resistance on outlet pipeline
Power to keep flow constant, so as to constantly reduce NPSH values (net positive suction head value), until lift declines 3%, NPSH values now
Net positive suction head value as to be measured.Because the net positive suction head of centrifugal pump also accurately cannot be calculated and cavitation experiment at present by theoretical
Itself has higher difficulty again, and this allows for often occurring in real work, and net positive suction head measurement is inaccurate, and the testing time is longer
And labour intensity it is larger the problems such as.
For disadvantages mentioned above, researchers propose the solution of correlation：On the one hand it is that cavitation is occurred according to centrifugal pump
When relevant parameter the characteristics of, it is proposed that using Noise Method, vibratory drilling method, pressure pulsation method, electrical measuring method, image method etc. judge from
The method of heart pump cavitation situation, and obtained certain application；On the other hand it is that Cavitation Occurred in Centrifugal Pumps examination is changed by designed, designed
Experiment device, increases some accessories and test components and parts, to improve certainty of measurement.However, due to technology or economic aspect
Limitation, application of these solutions in Practical Project is few, and operating process is inconvenient, be difficult to automation survey
Examination.
The content of the invention
The purpose of this utility model is to overcome net positive suction head certainty of measurement existing for existing cavitation experiment method not
The high, defect that the testing time is longer and labour intensity is larger.
To achieve these goals, the utility model proposes a kind of centrifugal pump critical cavitation point detection device, including under
State part：
(1) imported valve being connected on inlet pipeline and inlet pressure transmitter；
(2) outlet valve on outlet pipeline, flowmeter and outlet pressure transmitter are connected to；
(3) torque rotary speed sensor being connected between motor and centrifugal pump to be measured；
(4) simultaneously sampling multi-function card and industrial computer；
The imported valve, inlet pressure transmitter, outlet valve, flowmeter, outlet pressure transmitter and torque rotary speed
Sensor is connected by holding wire with simultaneously sampling multi-function card, and simultaneously sampling multi-function card is by Ethernet and industrial computer
Connection.
Further, the imported valve and outlet valve are pneumatic control valve door.
The utility model has following beneficial effects：
Because the utility model employs imported valve, inlet pressure transmitter, outlet valve, flowmeter, outlet pressure
The parts such as transmitter, torque rotary speed sensor, simultaneously sampling multi-function card and industrial computer, its mode pair that can be automatically controlled
Imported valve and outlet valve carry out coarse adjustment or fine setting, so as to improve the stability of test system and the regulation of critical cavitation point
Precision, is effectively shortened the testing time.In a word, the utility model can increase substantially oneself of centrifugal pump critical cavitation point detection
Dynamicization level, measuring accuracy and efficiency.
Description of the drawings
Fig. 1 is the structure ＆ working mechanism schematic diagram of the detection means of centrifugal pump critical cavitation point；
Fig. 2 is centrifugal pump critical cavitation point test flow chart.
Specific embodiment
Below in conjunction with accompanying drawing, one embodiment of the present utility model is introduced.
As shown in figure 1, a kind of detection means of centrifugal pump critical cavitation point, including components described below：
(1) imported valve 1 and inlet pressure transmitter 2 being connected on inlet pipeline；
(2) outlet valve 5 on outlet pipeline, flowmeter 4 and outlet pressure transmitter 3 are connected to；
(3) torque rotary speed sensor 6 being connected between motor 7 and centrifugal pump to be measured 8；
(4) simultaneously sampling multi-function card 9 and industrial computer 10；
The imported valve, inlet pressure transmitter, outlet valve, flowmeter, outlet pressure transmitter and torque rotary speed
Sensor is connected by holding wire with simultaneously sampling multi-function card, and simultaneously sampling multi-function card is by Ethernet 11 and industry control
Machine connects.It is another it should be noted that, " import " and " outlet " in above-mentioned component names is intended merely to show the part corresponding to it
The position installed is on inlet pipeline, or on outlet pipeline, without other restriction effects.In addition, in this enforcement
In example, the imported valve, outlet valve use pneumatic control valve.
In above-mentioned part, imported valve, the effect of outlet valve are to adjust the stream on inlet pipeline, outlet pipeline respectively
Body flow；The effect of inlet pressure transmitter and outlet pressure transmitter is to measure the stream on inlet pipeline, outlet pipeline respectively
Body pressure (referred to as inlet pressure, outlet pressure)；The effect of flowmeter is the flow for measuring the fluid on outlet pipeline；Torque
The effect of speed probe is the rotating speed and moment of torsion for measuring centrifugal pump；The effect of simultaneously sampling multi-function card is that Real-time Collection enters
The data messages such as the performance number of mouthful pressure, outlet pressure, flow, rotating speed and motor simultaneously pass to industrial computer and carry out data processing simultaneously
Show in real time；Industrial computer sends control signal on the basis of data processing, by simultaneously sampling multi-function card to inlet valve
Door, the working condition of outlet valve are controlled, so as to the state for adjusting whole device reaches target operating condition state.
More than, describe the structure ＆ working mechanism of one embodiment of the present utility model with reference to accompanying drawing.Hereinafter, further
Introduce the method for detecting centrifugal pump critical cavitation point with the utility model.
As shown in Fig. 2 detecting that the method for centrifugal pump critical cavitation point comprises the steps with the utility model：
Step one, in performance of centrifugal pump process of the test, records the outlet valve of cavitation experiment flow rate working conditions point to be measured
Opening value, (in order to describe the convenience of problem, in the present embodiment the initial opening value being represented with A), according in centrifugal pump famous brand
Net positive suction head value when estimating critical cavitation corresponding inlet pressure scope (in order to state the convenience of problem, in this enforcement
Estimated inlet pressure scope, and a are represented with a-b in example>b).In execution step for the moment, reference inlet port pressure estimation value
Whether scope a-b, can fall in the range of the estimated value according to actual inlet pressure, inlet valve is carried out coarse adjustment or/and
Fine setting.Total principle is, when actual inlet pressure does not fall within estimated value scope, coarse adjustment is carried out to imported valve and (is adjusted
Section amplitude is big), when actual inlet pressure falls into estimated value scope, then inlet valve is finely adjusted (amplitude of accommodation is little).
Step 2, imported valve is opened entirely, while initial opening value A of outlet valve is set to into opening for outlet valve
Angle value, starts the measurement of first group of data.
Step 3, checks the deviation of centrifugal pump actual flow value and desired value flow value whether adjusting in error range,
If not being finely adjusted to outlet valve in the regulation error range.It is noted that in due to whole process of the test, going out
The opening value of mouth valve can't occur too big change, that is to say, that the corresponding outlet valve opening value of cavitation point and outlet valve
The difference of door initial opening value is less, therefore, during whole cavitation experiment, if outlet valve need to be adjusted, each outlet valve
Regulation is fine setting, and finely tunes sensitivity of the amplitude for pneumatic control valve.
Step 4, after inlet pressure transmitter, outlet pressure transmitter, meter readings are stable, collection inlet pressure,
Outlet pressure, flow, rotating speed, performance number, according to centrifugal pump lift and net positive suction head computing formula, industrial computer passes through data processing
Calculate lift, the net positive suction head value of centrifugal pump.The amplitude of accommodation and governing speed due to controlling valve, system mode is very fast
Reach stable.Here the first group of lift value for collecting declines 3% reduced value as lift.
Step 5, judges whether lift declines 3%, and condition meets, then off-test；Condition is unsatisfactory for, then judge now
Inlet pressure size, amplitude that imported valve is turned down is determined with this.Because general cavitation experiment has more than 10 work
Condition point, and before detection the operating point of half part when, pump does not also reach cavitation state, so step actually can also be from the 3rd
Individual operating point or operating point further below start test.But in view of the structure of program, in the present embodiment, often test one
Individual operating point is both needed to the judgement of cavitation into whether, and the reduced value of first operating point lift correspondence flow when being performance test
The lift value of point, program need to give an initialization value of lift reduced value, therefore the test process of the present embodiment is from first
Operating point starts.
Step 6, if inlet pressure is more than a, coarse adjustment, that is, the amplitude that imported valve is turned down is carried out to imported valve
For K；If inlet pressure is less than a, imported valve is finely adjusted, that is, it is that (I values are pneumatic tune to I that inlet valve turns down amplitude
Section threshold sensitivity).In other words, as according to the state of test device, to imported valve coarse adjustment or fine setting are selected.Typically do
Method is phase before the test, and to imported valve coarse adjustment is carried out, and when inlet pressure actual value falls in the range of estimated value a-b, then
Start to finely tune inlet valve.Here coarse adjustment range value K, can be a constant, or one group of constant, i.e., according to different works
The segmentation of condition point is given.
After above-mentioned six steps are implemented, if lift has declined 3%, off-test；If lift does not decline 3%,
Repeat step three arrives step 6, until lift declines 3%.
In a word, the utility model is by the amplitude of accommodation and governing speed to valve (including imported valve and outlet valve)
Automatically control, the stability of test system and the degree of regulation of critical cavitation point are improve, while improve testing efficiency.Root
The outlet valve opening value recorded during according to performance test, in cavitation experiment, first coarse adjustment outlet valve, reduces the testing time.By catching
Critical cavitation point is caught, net positive suction head value can be directly tried to achieve, without the data processor in later stage.
Claims (2)
1. a kind of centrifugal pump critical cavitation point detection device, including components described below：
(1) imported valve being connected on inlet pipeline and inlet pressure transmitter；
(2) outlet valve on outlet pipeline, flowmeter and outlet pressure transmitter are connected to；
(3) torque rotary speed sensor being connected between motor and centrifugal pump to be measured；
(4) simultaneously sampling multi-function card and industrial computer；
The imported valve, inlet pressure transmitter, outlet valve, flowmeter, outlet pressure transmitter and torque rotary speed sensing
Device is connected by holding wire with simultaneously sampling multi-function card, and simultaneously sampling multi-function card is connected by Ethernet with industrial computer
Connect.
2. centrifugal pump critical cavitation point detection device as claimed in claim 1, it is characterised in that：The imported valve and outlet
Valve is pneumatic control valve door.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621175592.1U CN206175252U (en) | 2016-10-27 | 2016-10-27 | Critical cavitation point detection device of centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621175592.1U CN206175252U (en) | 2016-10-27 | 2016-10-27 | Critical cavitation point detection device of centrifugal pump |
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| Publication Number | Publication Date |
|---|---|
| CN206175252U true CN206175252U (en) | 2017-05-17 |
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ID=58681671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621175592.1U Active CN206175252U (en) | 2016-10-27 | 2016-10-27 | Critical cavitation point detection device of centrifugal pump |
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| Country | Link |
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| CN (1) | CN206175252U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106368960A (en) * | 2016-10-27 | 2017-02-01 | 广东肯富来泵业股份有限公司 | Device and method for detecting critical cavitation point of centrifugal pump |
| CN110939582A (en) * | 2019-12-05 | 2020-03-31 | 万华化学集团股份有限公司 | Pump control method, storage medium, and electronic device |
-
2016
- 2016-10-27 CN CN201621175592.1U patent/CN206175252U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106368960A (en) * | 2016-10-27 | 2017-02-01 | 广东肯富来泵业股份有限公司 | Device and method for detecting critical cavitation point of centrifugal pump |
| CN110939582A (en) * | 2019-12-05 | 2020-03-31 | 万华化学集团股份有限公司 | Pump control method, storage medium, and electronic device |
| CN110939582B (en) * | 2019-12-05 | 2021-04-20 | 万华化学集团股份有限公司 | Pump control method, storage medium, and electronic device |
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