CN105928703A - Optical method for judging lower sealing rotation rubbing of hydraulic mechanical model impeller - Google Patents
Optical method for judging lower sealing rotation rubbing of hydraulic mechanical model impeller Download PDFInfo
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- CN105928703A CN105928703A CN201610326112.5A CN201610326112A CN105928703A CN 105928703 A CN105928703 A CN 105928703A CN 201610326112 A CN201610326112 A CN 201610326112A CN 105928703 A CN105928703 A CN 105928703A
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- hydraulic
- impeller
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- blade
- lower seal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
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- General Physics & Mathematics (AREA)
- Hydraulic Turbines (AREA)
Abstract
The invention discloses an optical method for judging lower sealing rotation rubbing of a hydraulic mechanical model impeller, and relates to the field of fault judgment of a hydraulic mechanical model test bench. The method employs the stroboscopic effect theory to adjust the flashing rate of a stroboscopic light source for observing the movement state of an impeller blade according to a blade at a part rubbing with the rotating and fixed parts of an impeller lower sealing pair and the characteristic that the relatively remarkable local deformation of a lower ring part causes the apparent changes of the shape of the blade and the distance between the blade and the adjacent blade, so as to judge whether the lower sealing rotation rubbing of the hydraulic mechanical model impeller happens or not.
Description
Technical field:
The present invention relates to a kind of optics differentiating that the rotation of hydraulic model impeller lower seal scratches
Method.
Background technology:
As determining prototype hydraulic performance and carrying out the important means of corresponding hydraulic research,
Hydraulic model test is constantly subjected to the great attention of industry.Along with hydraulic modelling
Hydraulic model test required precision is particularly improved constantly by level of processing, hydraulic
The seal clearance of model impeller presents the trend of reduction steadily.
Farther out and it is cantilever owing to hydraulic model impeller is in the end distance support of axle system
State, the rotating speed of hydraulic model impeller is higher in addition, inevitably in process of the test
The phenomenon of middle generation weak vibrations.Owing to hydraulic model impeller seals gap is less, some
Will occur under extreme case, between hydraulic model impeller seals pair, to be especially in rotary shaft
The hydraulic model impeller lower seal being distalmost end is secondary---and-rotating part and fixed part divide it
Between, rub phenomenon.Once occur hydraulic model impeller lower seal pair rotating part with solid
Determine the rub phenomenon between part, owing to occurring between impeller lower seal pair rotating part and standing part
Contact friction, not only can impact the test accuracy of hydraulic model test, also can not
With degree, the sealing surfaces of sealing pair is damaged.Owing to hydraulic model impeller is at water
Middle work, between hydraulic model impeller lower seal pair rotating part to be determined and standing part be
Whether no generation rub phenomenon, can only stablize according to hydraulic model test result between coming at present
Connect supposition.The method not only judging nicety rate is low, is easily caused and causes hydraulic model test
The true cause of unstable result is left in the basket, and also resides in and once uses above-mentioned traditional inspection method
Between suspection generation impeller lower seal pair rotating part and standing part if rub phenomenon, also need to treat
After lot of experiments water in hydraulic rig for model test all arranges light, impeller demolition is got off
Observe lower seal pair rotating part and whether standing part working surface occurs that scratch could be final
Determine.
Above-mentioned traditional inspection method not only needs to waste substantial amounts of manpower and materials and time, and
Close owing to not having a reliable real-time live detection methods to determine whether really to have under impeller
Between the secondary rotating part of envelope and standing part, rub phenomenon occurs, after often being got off by impeller demolition
Find, between impeller lower seal pair rotating part and standing part, rub phenomenon does not occurs, just have impact on
Normal model test progress.Therefore, it is necessary to exploitation one can be in hydraulic model test
On platform, particularly under hydraulic model duty, the most accurately differentiate hydraulic mould
Type impeller lower seal rotates the method scratched.
Summary of the invention:
The technical problem to be solved in the present invention is to provide under a kind of differentiation hydraulic model impeller
Seal and rotate the optical means scratched.The technical scheme is that
1) hydraulic rig for model test is adjusted to duty；
2) hydraulic rig for model test rotating speed is made to keep stable；
3) stroboscopic light source is opened；
4) adjust the flashing rate of stroboscopic light source, make hydraulic rig for model test speed-frequency
Keep constant and within 5Hz with the difference of stroboscopic light source flashing rate；
5) by observation hydraulic model impeller district reserved on hydraulic rig for model test
Impeller blade kinestate observed by the transparent observing window of territory flow regime；
6) if by observation hydraulic model leaf reserved on hydraulic rig for model test
The impeller blade kinestate that the transparent observing window of wheel region flow regime is observed is slow
Uniform motion, then show between hydraulic model impeller lower seal pair rotating part and standing part
Occur without rub phenomenon；If impeller blade is totally in slow uniform speed motion state, constant duration
Ground occurs that runner bucket is stagnated or step phenomenon, then show that hydraulic model impeller lower seal is secondary
Rub phenomenon is there occurs between rotating part and standing part.
Technique effect:
The present invention discloses a kind of optics differentiating that the rotation of hydraulic model impeller lower seal scratches
Method, achieves first and utilizes optical means to hydraulic model impeller lower seal pair rotation section
Divide and there occurs between standing part the real-time detection of rub phenomenon.
Stroboscopic light source is that adjustable can to send moment according to setpoint frequency strong for a kind of flashing rate
The special equipment of flash of light.When the flashing rate of stroboscopic light source is adjusted to and hydraulic model just
When rotational frequency is identical, although now hydraulic model impeller blade is still at high speed rotating, but
Human eye looks but as blade presents quiet for hydraulic model fixed component
Labelling in the most motionless state and hydraulic model impeller blade is high-visible.Here it is frequency
Dodge effect principle.If the flashing rate of stroboscopic light source is adjusted to and hydraulic model test
Platform speed-frequency difference 5Hz within and keep this difference constant, the most still at high speed rotating
Hydraulic model impeller blade human eye look, present slow uniform speed motion state.
Hydraulic model impeller is made up of crown, some blades and the lower several parts of ring, blade
It is separately fixed at mechanically on crown and lower ring.From composition structure it can be seen that waterpower
Mechanistic model impeller can be seen as an elastomer in a rotational direction: when hydraulic model
During impeller normal rotation, the blade on hydraulic model impeller is as between water energy and mechanical energy
The critical piece of energy conversion, all the time by a constant active force, the Light deformation of blade is also
It is identical.By stroboscopic light source by observation water engineer reserved on hydraulic rig for model test
The transparent observing window of tool model impeller region flow regime is irradiated on the impeller blade of rotation,
If the flashing rate now adjusting stroboscopic light source makes hydraulic rig for model test speed-frequency
With the difference of stroboscopic light source flashing rate keep constant and within 5Hz and pass through hydraulic mould
The transparent observing observing hydraulic model impeller region flow regime reserved on type testing stand
If impeller blade kinestate observed by window, it becomes possible to the impeller blade kinestate observed
For slow uniform motion；And when hydraulic model impeller lower seal pair rotating part and fixed part
When there occurs rub phenomenon between Fen, the blade on hydraulic model impeller is except all the time by one
Individual constant water active force as outside, also by an impeller lower seal pair rotating part and solid
Determine the resistance contrary with the impeller direction of motion all the time occurring to produce during rub phenomenon between part
Power.There occurs between hydraulic model impeller lower seal pair rotating part and standing part and scratch now
As time, under hydraulic model impeller, ring all can constantly repeat moment in rotary course and scratches
----without scratching----moment scratches----without scratching ... process.Close owing to occurring under impeller
Rub phenomenon between the secondary rotating part of envelope and standing part is contact between points not
Affect the normal rotation of impeller and only the thin-wall part in this structure of ring under impeller applied
One resistance contrary with the impeller direction of motion, this power makes ring under impeller create local
Recoverable deformation.Owing under impeller, the local deformation amount of ring is extremely limited, it can affect
The limited amount of blade, the deformation that under impeller, ring produces is merely capable of directly resulting in and scratches place
Lower ring and scratch place's blade mechanically coupled together with lower ring relatively prominently local shape occurs
Become the most undeformed generation of other blades.If now adjusting the flashing rate of stroboscopic light source
Hydraulic rig for model test speed-frequency and the difference of stroboscopic light source flashing rate is made to keep constant
And within 5Hz and by observation hydraulic mould reserved on hydraulic rig for model test
If impeller blade kinestate observed by the transparent observing window of type impeller region flow regime, then
Due to the overwhelming majority the most undeformed generation of blade, it can be observed that impeller blade is totally in slowly
Uniform speed motion state, and owing to cutting to pieces between impeller lower seal pair rotating part and standing part
There occurs relatively prominently local deformation at the blade at the place of rubbing and lower ring, cause this blade shape and
The spacing being adjacent blade there occurs change, relative to hydraulic rig for model test rotating speed frequency
Rate, namely for runner rotational frequency, the blade deformed upon there occurs phase place hysteresis phenomenon,
Namely it is observed that constant duration ground occurs that runner bucket is stagnated or the phenomenon of step.
Employing optical means can be sketched out with being apparent from by above-mentioned analysis and judge hydraulic
Model impeller lower seal rotates the concrete steps scratched: when stroboscopic light source is by hydraulic model
The transparent windows observing hydraulic model impeller region flow regime reserved on testing stand
Mouth is irradiated on the impeller blade that rotates and hydraulic rig for model test speed-frequency and stroboscopic
The difference of light source flashing rate keeps constant and time within 5Hz, if impeller blade kinestate
For slow uniform motion, then hydraulic model impeller lower seal pair rotating part and standing part
Between without rub phenomenon occur；If occurring that runner bucket is stagnated or the showing of step constant duration
As, then show to there occurs between hydraulic model impeller lower seal pair rotating part and standing part
Rub phenomenon.
Present invention firstly discloses one can be the most accurate under hydraulic model duty
Really differentiate whether hydraulic model impeller lower seal rotates the method scratched.With traditional
Judge that hydraulic model impeller lower seal is by the reduction of hydraulic model external characteristics
The no method scratched that rotates is compared, and not only real-time judgment scratches the accuracy rate whether occurred and carries
Up to 100%, and without for finally determining whether hydraulic model impeller lower seal
Rub phenomenon and lot of experiments water in hydraulic rig for model test is all arranged light, then by leaf
Wheel just can make final judgement after disassembling, thus improves hydraulic rig for model test
Utilization rate.
Detailed description of the invention:
A kind of optical means differentiating that the rotation of hydraulic model impeller lower seal scratches, its operation
Flow process is:
1) hydraulic rig for model test is adjusted to duty；
2) hydraulic rig for model test rotating speed is made to keep stable；
3) stroboscopic light source is opened；
4) adjust the flashing rate of stroboscopic light source, make hydraulic rig for model test speed-frequency
Keep constant and within 5Hz with the difference of stroboscopic light source flashing rate；
5) by observation hydraulic model impeller district reserved on hydraulic rig for model test
Impeller blade kinestate observed by the transparent observing window of territory flow regime；
6) if by observation hydraulic model leaf reserved on hydraulic rig for model test
The impeller blade kinestate that the transparent observing window of wheel region flow regime is observed is slow
Uniform motion, then show between hydraulic model impeller lower seal pair rotating part and standing part
Occur without rub phenomenon；If impeller blade is totally in slow uniform speed motion state, constant duration
Ground occurs that runner bucket is stagnated or step phenomenon, then show that hydraulic model impeller lower seal is secondary
Rub phenomenon is there occurs between rotating part and standing part.
Claims (1)
1. differentiate that hydraulic model impeller lower seal rotates the optical means scratched, its
Feature is: operating procedure is as follows:
1) hydraulic rig for model test is adjusted to duty；
2) hydraulic rig for model test rotating speed is made to keep stable；
3) stroboscopic light source is opened；
4) adjust the flashing rate of stroboscopic light source, make hydraulic rig for model test speed-frequency
Keep constant and within 5Hz with the difference of stroboscopic light source flashing rate；
5) by observation hydraulic model impeller district reserved on hydraulic rig for model test
Impeller blade kinestate observed by the transparent observing window of territory flow regime；
6) if by observation hydraulic model leaf reserved on hydraulic rig for model test
The impeller blade kinestate that the transparent observing window of wheel region flow regime is observed is slow
Uniform motion, then show between hydraulic model impeller lower seal pair rotating part and standing part
Occur without rub phenomenon；If impeller blade is totally in slow uniform speed motion state, constant duration
Ground occurs that runner bucket is stagnated or step phenomenon, then show that hydraulic model impeller lower seal is secondary
Rub phenomenon is there occurs between rotating part and standing part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610326112.5A CN105928703A (en) | 2016-05-17 | 2016-05-17 | Optical method for judging lower sealing rotation rubbing of hydraulic mechanical model impeller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610326112.5A CN105928703A (en) | 2016-05-17 | 2016-05-17 | Optical method for judging lower sealing rotation rubbing of hydraulic mechanical model impeller |
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| CN105928703A true CN105928703A (en) | 2016-09-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610326112.5A Pending CN105928703A (en) | 2016-05-17 | 2016-05-17 | Optical method for judging lower sealing rotation rubbing of hydraulic mechanical model impeller |
Country Status (1)
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4618256A (en) * | 1985-04-12 | 1986-10-21 | Eaton Corporation | Stroboscopic method for determining gear mesh quality |
| DE102005030914A1 (en) * | 2005-06-30 | 2007-01-11 | Mann + Hummel Gmbh | Combustion engine camshaft wear and functional test procedure views camshaft under stroboscopic lighting through transparent windows in valve cover |
| CN2881587Y (en) * | 2006-03-09 | 2007-03-21 | 上海师范大学 | Detecting system of automobile clutch slip |
-
2016
- 2016-05-17 CN CN201610326112.5A patent/CN105928703A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4618256A (en) * | 1985-04-12 | 1986-10-21 | Eaton Corporation | Stroboscopic method for determining gear mesh quality |
| DE102005030914A1 (en) * | 2005-06-30 | 2007-01-11 | Mann + Hummel Gmbh | Combustion engine camshaft wear and functional test procedure views camshaft under stroboscopic lighting through transparent windows in valve cover |
| CN2881587Y (en) * | 2006-03-09 | 2007-03-21 | 上海师范大学 | Detecting system of automobile clutch slip |
Non-Patent Citations (1)
| Title |
|---|
| 修东亮: "矿井通风机叶轮转速测量的分析与研究", 《机电技术》 * |
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Application publication date: 20160907 |
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