CN106052634A - Level gauge-based water turbine blade rotation angle measurement method - Google Patents
Level gauge-based water turbine blade rotation angle measurement method Download PDFInfo
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- CN106052634A CN106052634A CN201610639341.2A CN201610639341A CN106052634A CN 106052634 A CN106052634 A CN 106052634A CN 201610639341 A CN201610639341 A CN 201610639341A CN 106052634 A CN106052634 A CN 106052634A
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- blade
- end points
- centrage
- servomotor stroke
- level gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C1/00—Measuring angles
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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Hydraulic Turbines (AREA)
- Control Of Water Turbines (AREA)
Abstract
The invention discloses a level gauge-based water turbine blade rotation angle measurement method. The method comprises selecting two reference points at two ends of a top center line of a blade, measuring a linear distance L1 of the two reference points, initializing a blade servomotor stroke to obtain an initial blade rotation angle beta, adjusting the blade servomotor stroke through an oil pressure unit, respectively measuring altitudes of the two reference points of each one of the blades relative to the same reference plane A in each current blade servomotor stroke through a level gauge, calculating the altitude difference delta H of the two reference points and calculating a blade rotation angle beta in each current blade servomotor stroke according to a function of beta=arcsin(delta H/L1). The method can detect internal transmission part replacement-caused blade initial angle and blade total rotation angle deviation before and after Kaplan turbine disintegration overhaul, ensure blade initial angle consistency and blade rotation angle uniformity after Kaplan turbine overhaul, is conducive to water turbine stable operation and has the advantages of simple processes and measurement accuracy.
Description
Technical field
The present invention relates to the blade outer corner measurement technology of hydropower industry Kaplan turbine, be specifically related to a kind of based on level
The hydraulic turbine blades Rotating Angle Measurement of instrument.
Background technology
Turbine equipment manufacturer generally carries out pre-assembled to rotary wheel of water turbine before delivery, by the corresponding biography of each blade
Dynamic part carries out classification and position mark, then it is on-the-spot to hydraulic turbine installation to split transport, according to mark ready-made during pre-assembled
Note re-assemblies.New operation unit typically need not do this project.After hydraulic turbine operation a period of time, due to associated mechanical
The abrasion of parts, it is also possible to occurring that hydraulic turbine blades corner changes, excessive deviation can cause the undercapacity of the hydraulic turbine, effect
Rate reduces and bad stability.The most necessary being adjusted hydraulic turbine blades corner and opening when maintenance is revised.
But lack corresponding advanced survey tool at Overhaul site, it is impossible to determine the accurate location of blade rotation centerline, to blade
It is the biggest that corner accurately measures difficulty.Typically do not do this measure the item, or the mode being placed on blade with inclinometer carries out letter
Single angular surveying, this mode is affected very big by blade surface position, deformation extent, and measured value inaccuracy even deviation is very
Greatly.
Summary of the invention
The technical problem to be solved in the present invention: for the problems referred to above of prior art, it is provided that one can detect rotary propeller type
Because changing blade initial angle and the blade total angle of rotation deviation that internal transmission part causes before and after hydraulic turbine Disintegration overhaul, it is ensured that
After hydraulic turbine maintenance consistent, the blade corner of blade initial angle uniformly, be conducive to that hydraulic turbine operation is stable, simple to operate, survey
Amount hydraulic turbine blades Rotating Angle Measurement based on level gauge accurately.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is:
A kind of hydraulic turbine blades Rotating Angle Measurement based on level gauge, step includes:
1) the top center line two ends at blade respectively select a reference point, measure the air line distance of two reference points
L1；
2) blade servomotor stroke is initialized as initial blade corner β；
3) two the most same ginsengs of reference point on each blade are measured under current blade servomotor stroke respectively with level gauge
Examine the elevation of plane A；
4) calculate the depth displacement △ H between two reference points, calculate current blade according to function β=arcsin (△ H/L1)
Blade corner β under servomotor stroke, wherein △ H represents the depth displacement of two reference points, and L1 represents the straight line of two reference points
Distance；
5) judge that blade servomotor stroke has reached the predetermined threshold value of blade servomotor stroke, if reaching default
Threshold value then terminates and exits；Otherwise, make blade servomotor stroke motion to the next measurement point specified by oil gear, jump
Turn and perform step 3).
Preferably, described step 1) detailed step include:
1.1) judge that the top center line of blade is the most obvious, if the top center line of blade is substantially, select blade
End points P1 and P2 at top center line two ends is as a reference point, redirects execution step 1.3)；Otherwise redirect execution step 1.2)；
1.2) judge whether the end points P1 on the blade top water inlet limit near centrage weares and teares, if near centrage
Blade top water inlet limit end points P1 do not wear and tear, then with near centrage blade top water inlet limit end points P1
As first reference point, otherwise with the wear tip angle point P3 inside the end points near the blade top water inlet limit of centrage
P1 as a reference point；Judge whether the end points P2 of the blade top outlet edge near centrage weares and teares, if near center
The end points P2 of the blade top outlet edge of line does not weares and teares, then with the end points of the blade top outlet edge near centrage
P2 is as second reference point, otherwise with the wear tip angle point inside the end points near the blade top outlet edge of centrage
P4 is as second reference point；
1.3) air line distance L1 between two reference points is measured.
Preferably, described step 2) in when initializing blade servomotor stroke, initialized blade servomotor stroke is
0%；Described step 5) in the predetermined threshold value of blade servomotor stroke be 100%.
Preferably, described step 5) in make blade servomotor stroke motion to the next measurement specified by oil gear
During point, it is additionally included in correct position below propeller shank water inlet limit and places buttress or support, and at buttress or support and blade root
Coordinate wedge shape chock to withstand propeller shank water inlet limit between water inlet limit, portion, set up dial gauge at propeller shank and monitor blade in survey
The springback capacity of propeller shank during amount, if the springback capacity of propeller shank exceedes predetermined threshold value, then redirects and re-executes step
3)；Otherwise continue to perform backward.
Present invention hydraulic turbine blades based on level gauge Rotating Angle Measurement has an advantage that the present invention top at blade
Centrage two ends, portion respectively select a reference point, measure air line distance L1 of two reference points；Initialize one group of blade relay
Device stroke, traversal selects a blade servomotor stroke to make as current blade servomotor stroke, beginningization blade servomotor stroke
For initial blade corner β, regulate blade servomotor stroke by oil gear, measure each respectively with level gauge current
The elevation of two the most same reference plane A of reference point on each blade under blade servomotor stroke, calculates between two reference points
Depth displacement △ H, calculate the blade corner under each current blade servomotor stroke according to function β=arcsin (△ H/L1)
β such that it is able to before and after detection Kaplan turbine Disintegration overhaul because of change the blade initial angle that causes of internal transmission part and
Blade total angle of rotation deviation, it is ensured that after hydraulic turbine maintenance consistent, the blade corner of blade initial angle uniformly, be conducive to the hydraulic turbine
Stable, have simple to operate, measure advantage accurately.
Accompanying drawing explanation
Fig. 1 is the basic procedure schematic diagram of embodiment of the present invention method.
Fig. 2 is the principle schematic of embodiment of the present invention method choice reference point.
Detailed description of the invention
As it is shown in figure 1, the step of the present embodiment hydraulic turbine blades based on level gauge Rotating Angle Measurement includes:
1) the top center line two ends at blade respectively select a reference point, measure the air line distance of two reference points
L1；
2) blade servomotor stroke is initialized as initial blade corner β；
3) two the most same ginsengs of reference point on each blade are measured under current blade servomotor stroke respectively with level gauge
Examine the elevation of plane A；
4) calculate the depth displacement △ H between two reference points, calculate current blade according to function β=arcsin (△ H/L1)
Blade corner β under servomotor stroke, wherein △ H represents the depth displacement of two reference points, and L1 represents the straight line of two reference points
Distance；
5) judge that blade servomotor stroke has reached the predetermined threshold value of blade servomotor stroke, if reaching default
Threshold value then terminates and exits；Otherwise, make blade servomotor stroke motion to the next measurement point specified by oil gear, jump
Turn and perform step 3).
In the present embodiment, step 1) detailed step include:
1.1) judge that the top center line of blade is the most obvious, if the top center line of blade is substantially, select blade
End points P1 and P2 (see Fig. 2) at top center line two ends is as a reference point, redirects execution step 1.3)；Otherwise redirect execution step
1.2)；
1.2) judge whether the end points P1 on the blade top water inlet limit near centrage weares and teares, if near centrage
Blade top water inlet limit end points P1 do not wear and tear, then with near centrage blade top water inlet limit end points P1
As first reference point, otherwise with the wear tip angle point P3 inside the end points near the blade top water inlet limit of centrage
(see Fig. 2) P1 as a reference point；Judge whether the end points P2 of the blade top outlet edge near centrage weares and teares, if leaned on
The end points P2 of the blade top outlet edge of nearly centrage does not weares and teares, then with the blade top outlet edge near centrage
End points P2 as second reference point, otherwise with the abrasion inside the end points near the blade top outlet edge of centrage
End angle point P4 (see Fig. 2) is as second reference point；
1.3) air line distance L1 between two reference points is measured.
In the present embodiment, two reference points of selection are specially end points P1 and P2 at the top center line two ends of blade, end
Elevation corresponding for some P1 is H1, and elevation corresponding for end points P2 is that (in like manner, elevation corresponding for wear tip angle point P3 is H3 to H2, abrasion
End elevation corresponding to angle point P4 is H4), the depth displacement △ H between two reference points is elevation H1, distance between elevation H2, two
Air line distance L1 between individual reference point is concrete as shown in Figure 2.
In the present embodiment, described step 2) in when initializing blade servomotor stroke, initialized blade servomotor stroke
It is 0%；Described step 5) in the predetermined threshold value of blade servomotor stroke be 100%, the measurement point of blade servomotor stroke is concrete
Including 0%, 25%, 50%, 75%, 100% 5 kind.Blade initial angle is i.e. blade servomotor blade under 0% stroke
Angle value, the blade total angle of rotation is i.e. blade servomotor blade angle difference under 0% stroke and 100% stroke.The most general
For, when initializing one group of blade servomotor stroke blade servomotor stroke should at least include 0%, 100% two kind of stroke.
For guaranteeing certainty of measurement, prevent measure during blade position change, the present embodiment step 5) in by oil
When pressure device makes blade servomotor stroke motion to the next measurement point specified, it is additionally included in below propeller shank water inlet limit and closes
Right position placement location buttress or support, and coordinate wedge shape chock to withstand blade root between buttress or support and propeller shank water inlet limit
Water inlet limit, portion, sets up dial gauge at propeller shank and monitors blade springback capacity of propeller shank during measuring, if blade
The springback capacity of root exceedes predetermined threshold value, then redirect and re-execute step 3)；Otherwise continue to perform backward.By the way,
It is able to ensure that the springback capacity of propeller shank is in predetermined threshold value such that it is able to improve the most fixed and reliable of blade roll angle inspection
Property.
The present embodiment hydraulic turbine blades Rotating Angle Measurement is simple to operate, measures accurately, at 5 hydraulic turbines of Hongjiang power plant
Maintenance plays a role, it is ensured that after hydraulic turbine maintenance, blade initial angle is consistent, it is ensured that the uniformity of blade corner, has
It is beneficial to hydraulic turbine operation stable.It should be noted that general Kaplan turbine has 3～5 blades, multi-disc blade passes through connecting rod
Sharing a blade servomotor, when servomotor runs, multi-disc blade runs simultaneously, and every blade angle now is answered in theory
Unanimously, when therefore using the present embodiment hydraulic turbine blades Rotating Angle Measurement to measure, it is only necessary to a piece of blade is surveyed
Measure.But, for the hydraulic turbine that the blade corner of upper every blade is inconsistent, then use the present embodiment hydraulic turbine oar
Need when leaf Rotating Angle Measurement measures individually every a piece of blade to be measured.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned enforcement
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that, for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications are also
Should be regarded as protection scope of the present invention.
Claims (4)
1. a hydraulic turbine blades Rotating Angle Measurement based on level gauge, it is characterised in that step includes:
1) the top center line two ends at blade respectively select a reference point, measure air line distance L1 of two reference points；
2) blade servomotor stroke is initialized as initial blade corner β；
3) measure under current blade servomotor stroke two the most same references of reference point on each blade respectively with level gauge to put down
The elevation of face A；
4) calculate the depth displacement △ H between two reference points, calculate current blade relay according to function β=arcsin (△ H/L1)
Blade corner β under device stroke, wherein △ H represents the depth displacement of two reference points, and L1 represents the air line distance of two reference points；
5) judge that blade servomotor stroke has reached the predetermined threshold value of blade servomotor stroke, if reaching predetermined threshold value
Then terminate and exit；Otherwise, make blade servomotor stroke motion to the next measurement point specified by oil gear, redirect and hold
Row step 3).
Hydraulic turbine blades Rotating Angle Measurement based on level gauge the most according to claim 1, it is characterised in that described step
Rapid 1) detailed step includes:
1.1) judge that the top center line of blade is the most obvious, if the top center line of blade is substantially, select the top of blade
End points P1 and P2 at centrage two ends is as a reference point, redirects execution step 1.3)；Otherwise redirect execution step 1.2)；
1.2) judge whether the end points P1 on the blade top water inlet limit near centrage weares and teares, if near the oar of centrage
Leaf top water inlet limit end points P1 do not wear and tear, then using near centrage blade top water inlet limit end points P1 as
First reference point, otherwise using near centrage blade top water inlet limit end points inside wear tip angle point P3 as
Reference point P1；Judge whether the end points P2 of the blade top outlet edge near centrage weares and teares, if near centrage
The end points P2 of blade top outlet edge does not weares and teares, then make with the end points P2 of the blade top outlet edge near centrage
It is second reference point, otherwise makees with the wear tip angle point P4 inside the end points near the blade top outlet edge of centrage
It is second reference point；
1.3) air line distance L1 between two reference points is measured.
Hydraulic turbine blades Rotating Angle Measurement based on level gauge the most according to claim 1, it is characterised in that described step
Rapid 2), when initializing blade servomotor stroke in, initialized blade servomotor stroke is 0%；Described step 5) in blade relay
The predetermined threshold value of device stroke is 100%.
Hydraulic turbine blades Rotating Angle Measurement based on level gauge the most according to claim 1, it is characterised in that described step
Rapid 5), when making blade servomotor stroke motion to the next measurement point specified by oil gear in, it is additionally included in propeller shank
Below water inlet limit, correct position places buttress or support, and coordinates wedge plug between buttress or support and propeller shank water inlet limit
Block withstands propeller shank water inlet limit, sets up dial gauge at propeller shank and monitors blade resilience of propeller shank during measuring
Amount, if the springback capacity of propeller shank exceedes predetermined threshold value, then redirects and re-executes step 3)；Otherwise continue to perform backward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610639341.2A CN106052634B (en) | 2016-08-05 | 2016-08-05 | Hydraulic turbine blades Rotating Angle Measurement based on spirit level |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610639341.2A CN106052634B (en) | 2016-08-05 | 2016-08-05 | Hydraulic turbine blades Rotating Angle Measurement based on spirit level |
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| Publication Number | Publication Date |
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| CN106052634A true CN106052634A (en) | 2016-10-26 |
| CN106052634B CN106052634B (en) | 2018-08-10 |
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| CN106568397A (en) * | 2016-10-28 | 2017-04-19 | 成都发动机（集团）有限公司 | Determination method of aero-engine installation center surface |
| CN108663000A (en) * | 2018-05-17 | 2018-10-16 | 贵州电网有限责任公司 | A kind of diagnostic method of hydraulic turbine main servomotor displacement sensor for pull rope failure |
| CN114876697A (en) * | 2022-04-29 | 2022-08-09 | 重庆大唐国际武隆水电开发有限公司 | Blade opening uniformity and synchronism measuring method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106568397A (en) * | 2016-10-28 | 2017-04-19 | 成都发动机（集团）有限公司 | Determination method of aero-engine installation center surface |
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| CN114876697A (en) * | 2022-04-29 | 2022-08-09 | 重庆大唐国际武隆水电开发有限公司 | Blade opening uniformity and synchronism measuring method |
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| CN106052634B (en) | 2018-08-10 |
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