CN209181957U - Movable propeller turbine runner static balance test device based on stress rods method - Google Patents
Movable propeller turbine runner static balance test device based on stress rods method Download PDFInfo
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- CN209181957U CN209181957U CN201920041567.1U CN201920041567U CN209181957U CN 209181957 U CN209181957 U CN 209181957U CN 201920041567 U CN201920041567 U CN 201920041567U CN 209181957 U CN209181957 U CN 209181957U
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- turbine runner
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Abstract
The utility model discloses the movable propeller turbine runner static balance test devices based on stress rods method, it includes the balance supporting plate for being used to support web, stress rods are installed in the bottom of balance supporting plate, the stress rods are supported on the top of balance base, and foil gauge group is pasted in stress rods；The outside of the web is equipped with blade.This device and method replaces traditional steel ball runner plate method, is used for movable propeller turbine runner static balance, and then improve test efficiency precision, reduce test security risk, solidity test device reduces experimental rig cost, provides safeguard for the test of power station unit static balance of rotary wheel.
Description
Technical field
The utility model proposes the movable propeller turbine runner static balance test devices based on stress rods method, are suitable for
Large and medium-sized movable propeller turbine runner static balancing test, using this method can accurately calculate runner amount of unbalance and partially
Heart orientation has certain practical value.
Background technique
Some hydropower station carries out capacity-increasing transformation, rotary wheel of water turbine manufacture in order to increase unit output, to the hydraulic turbine and generator
After being installed, static balancing test need to be carried out, to eliminate influence of the runner static unbalance to water wheels machine vibration.Traditional runner is quiet
Blance test method is steel ball runner plate method, and this method mainly has following deficiency: 1, hard to the surface of balanced ball and balance runner plate
Degree, roughness and local dent etc. require harsh；2, test period is long, and calculating is cumbersome, need to be by just balance, sensitivity inspection
It looks into, blade weight counterbalance, overall balance four-stage；3, it is limited by balance runner plate material property, this method is generally used for quality and is no more than
250 tons of runner；4, experimental rig poor universality, different types of runner need to use different experimental rigs；5, experimental rig
Critical component is easy to be damaged, and increases experimentation cost；6, there are biggish security risk, runner assembly has during the test
It may topple over.
Utility model content
The utility model aim is to provide the movable propeller turbine runner static balance test device based on stress rods method,
This device and method replaces traditional steel ball runner plate method, is used for movable propeller turbine runner static balance, and then improve examination
Accuracy and efficiency is tested, test security risk is reduced, solidity test device reduces experimental rig cost, is that power station unit runner is quiet flat
Weighing apparatus test provides safeguard.
In order to realize above-mentioned technical characteristic, purpose of the utility model is realized as follows: the axis based on stress rods method
Circulate propeller type water turbine static balance of rotary wheel experimental rig, it includes the balance supporting plate for being used to support web, in balance supporting plate
Bottom is equipped with stress rods, and the stress rods are supported on the top of balance base, and foil gauge group is pasted in stress rods；It is described
The outside of web is equipped with blade.
The bottom of the web is supported by multiple synchronous jacking devices.
The foil gauge group includes the first foil gauge for being arranged symmetrically in the same cross section of stress rods, the second foil gauge,
Three foil gauges and the 4th foil gauge.
Connector is installed at the top of the web.
First foil gauge is connected with third foil gauge using half-bridge connection, and constitutes a Wheatstone bridge.
Second foil gauge and the 4th foil gauge are connected using half-bridge connection, and constitute a Wheatstone bridge.
The utility model has the advantages that:
1, runner test is carried out using the method newly proposed and the risk that runner is toppled over is not present, increase static balance of rotary wheel examination
The safety tested.
2, in the case where selecting appropriate sensor, the precision of static balance of rotary wheel test is improved, calculating process letter
It is single.
3, using the method newly proposed, increased costs caused by experimental rig damage, while the benefit of experimental rig are avoided
It is largely increased with rate.
4, just balance is the assembly formed for web and connector, the static balance that referred to as just balance assembly carries out
Test, the purpose is to check the just amount of unbalance of balance assembly and eccentric orientation.
5, blade apolegamy is for the purpose of weight mass minimum when overall balance, according to the imbalance of first balance assembly
Amount, eccentric orientation, comprehensively consider the mass deviation of each blade, determine the optimal installation site of each blade.
6, overall balance is the assembly formed for web, connector and blade, and referred to as overall balance assembly carries out
Static balancing test makes residual unbalance, meet the requirement of allowable amount of unbalance by counterweight.
Detailed description of the invention
The utility model is described in further detail with reference to the accompanying drawings and examples.
Fig. 1 is the utility model experimental rig structure chart.
Fig. 2 is the utility model foil gauge arrangement schematic diagram.
The Wheatstone bridge schematic diagram that Fig. 3 is made of the first foil gauge of the utility model and third foil gauge.
The Wheatstone bridge schematic diagram that Fig. 4 is made of the second foil gauge of the utility model and the 4th foil gauge.
In figure: connector 1, blade 3, balance supporting plate 4, foil gauge group 5, stress rods 6, balance base 7, synchronizes web 2
Jacking apparatus 8；
First foil gauge 501, the second foil gauge 502, third foil gauge 503 and the 4th foil gauge 504.
Specific embodiment
The embodiments of the present invention is described further with reference to the accompanying drawing.
Embodiment 1:
Fig. 1-4 is please referred to, the movable propeller turbine runner static balance test device based on stress rods method, it includes using
In the balance supporting plate 4 of support web 2, stress rods 6 are installed in the bottom of balance supporting plate 4, the stress rods 6 are supported on balance
The top of pedestal 7 is pasted with foil gauge group 5 in stress rods 6；The outside of the web 2 is equipped with blade 3.By using
Above-mentioned experimental rig, any amount of unbalance of web is transmitted to stress rods, and then forms bending stress, passes through strain-ga(u)ge measurement
The numerical value of bending stress in foil gauge group and direction, to calculate the amount of unbalance and orientation of web；Stress rods with turn
The concentric of wheel body guarantees that the levelness of test platform and balance base is not more than by the cooperation precision of balance supporting plate and runner
0.02mm/m。
Further, the bottom of the web 2 is supported by multiple synchronous jacking devices 8.By using above-mentioned synchronization
Jacking apparatus 8 during the test can easily jack up web 2.
Further, the foil gauge group 5 include be arranged symmetrically in the same cross section of stress rods 6 the first foil gauge 501,
Second foil gauge 502, third foil gauge 503 and the 4th foil gauge 504.It can be right by using the foil gauge group 5 of above structure
The deflection of stress rods 6 is effectively measured.
Further, the top of the web 2 is equipped with connector 1.
Further, first foil gauge 501 is connected with third foil gauge 503 using half-bridge connection, and constitutes one
Wheatstone bridge.
Further, second foil gauge 502 is connected with the 4th foil gauge 504 using half-bridge connection, and constitutes one
Wheatstone bridge.
Embodiment 2:
Using the examination of the movable propeller turbine runner static balance test device described in any one based on stress rods method
Proved recipe method, it the following steps are included:
Step1: just balance；The first balance assembly formed for web 2 and connector 1 carries out static balancing test, into
And check the residual unbalance, and residual unbalance, orientation of just balance assembly；
Step2: blade apolegamy；For the purpose of weight mass minimum when overall balance, according to the injustice of first balance assembly
Measurement and eccentric orientation, comprehensively consider the mass deviation of each blade, determine the optimal installation site of each blade；
Step3: overall balance；The static balance carried out for the overall balance assembly that web 2, connector 1 and blade 3 are formed
Test makes residual unbalance, meet the requirement of allowable amount of unbalance by counterweight.
The concrete operations of the Step1 are as follows:
Step1.1: synchronous jacking device 8, balance supporting plate 4, stress rods 6 and balance base 7 are all installed in place, and will
Foil gauge group 5 is symmetrically attached to the same cross section of stress rods 6；
Step1.2: being measured using half-bridge connection, and then the first foil gauge 501 and third foil gauge 503 are linked to be one
Second foil gauge 502 and the 4th foil gauge 504 are linked to be a Wheatstone bridge, and are respectively connected to strain by a Wheatstone bridge
The input terminal of instrument；Wherein the first foil gauge 501 and third foil gauge 503 are denoted as by the strain of strain-ga(u)ge measurement passes through deformeter
The strain of measurement is denoted as ε13, the second foil gauge 502 and the 4th foil gauge 504 are denoted as by the strain of strain-ga(u)ge measurement and pass through strain
The strain of instrument measurement is denoted as ε24；
Step1.3: before on-test, when just balance assembly is supported by synchronous jacking device 8 completely, by the reading of deformeter
Number zero setting, is slowly fallen with synchronous jacking device 8 and just balances assembly, until being supported completely by stress rods 6；
Step1.4: it checks the levelness for balancing assembly at the beginning of when stable state, guarantees its levelness≤0.05mm/m, remember
Record the ε under stable state13And ε24；
Step1.5: assembly will be just balanced with synchronous jacking device again and will be jacked up, stress rods 6 is made not stress, deformeter is read
Number returns to zero, and repeats the above process 3 times, records 3 groups of data, and acquire average value respectively and beWithStep1.6: by above-mentioned
Test data calculate residual unbalance, and residual unbalance, orientation；
Wherein, residual unbalance:
In formula, U is residual unbalance, unit: kgm；λ is Wheatstone bridge configuration penalty coefficient；E is stress rods
Elasticity modulus, unit: MPa；R is stress rods radius, unit: mm；G is acceleration of gravity, unit: N/kg mm；
Residual unbalance, orientation:
In formula, α is the angle in residual unbalance, orientation and+X-axis, unit: rad；
If U≤Uper, just balance is qualified, otherwise needs to carry out counterweight；Wherein, Uper is to allow amount of unbalance；
Calculate weight mass:
In formula, P is to calculate weight mass, unit: kg；L is the mass center of added counterweight at a distance from web rotation axis,
Unit: m；
Step1.7: according to Step1.6 calculated result, counterweight is placed in the light side of just balance assembly, repeats above-mentioned step
Suddenly, and residual unbalance, U is calculated；If U≤Uper, then just balance is qualified, otherwise needs to carry out counterweight again；Measurement record is qualified
The quality P of additional bob-weight afterwardsc, radius LcWith orientation αc。
The concrete operations of the Step2 are as follows:
Step2.1: the quality and centroid position of blade 3 have generally measured and have had record before blade factory, if do not had
Record then needs to carry out blade weighing and centroid calculation；
Step2.2: just balance assembly amount of unbalance is matched by qualification when first balance and is calculated based on weight, is PcLc, it is located at qualification
The symmetric position of counterweight is decomposed X, Y-direction, is denoted as U respectivelyxAnd Uy；
Step2.3: blade apolegamy calculates；Under different leaf position combinations, square is asked to X-axis and Y-axis respectively, makes to succeed in one's scheme
Calculate amount of unbalance U1Minimum, the size and orientation for calculating amount of unbalance can be calculated as follows:
In formula, U1To calculate amount of unbalance, unit: kgm；WiFor a certain leaf quality, unit: kg；XiFor a certain blade
The X-coordinate of mass center, unit: m；YiFor the Y-coordinate of a certain vane centroid, unit: m；UxThe just X-axis of balance assembly amount of unbalance
Component, unit: kgm；UyFor the Y-axis component for just balancing assembly amount of unbalance, unit: kgm；θ is to calculate amount of unbalance
With the angle of+X-axis, unit: rad；
Calculate amount of unbalance U1The suggested position of leaf position when minimum, as blade apolegamy.
The concrete operations of the Step3 are as follows:
Step3.1: just after the completion of balance, numbering, hoisting blade according to the blade matched, will by connecting plate with screw rod
Blade is fixed on web, and the setting angle of blade is answered identical, and is at closed positions；
Step3.2: static balancing test is carried out again according to the method just balanced；After overall balance is qualified, added counterweight is recorded
Quality, radius and the orientation of block；And this result is converted by the equal principle of torque to the clump weight of connector or web and is pacified
Holding position；
Step3.3: clump weight after the installation is completed, is balanced test review；If U≤Uper, overall balance is qualified, otherwise
Counterweight again is answered, until meeting the requirements；Final weight mass, radius and orientation are denoted as P respectivelypz、Lpz、αpz。
Above-described embodiment is used to illustrate the utility model, rather than limits the utility model, practical at this
In novel spirit and scope of protection of the claims, to any modifications and changes that the utility model is made, this reality is both fallen within
With novel protection scope.
Claims (6)
1. the movable propeller turbine runner static balance test device based on stress rods method, it is characterised in that: it includes being used for
The balance supporting plate (4) for supporting web (2) is equipped with stress rods (6) in the bottom of balance supporting plate (4), stress rods (6) branch
Support is pasted with foil gauge group (5) at the top of balance base (7) on stress rods (6)；The external installation of the web (2)
There are blade (3).
2. the movable propeller turbine runner static balance test device according to claim 1 based on stress rods method,
Be characterized in that: the bottom of the web (2) is supported by multiple synchronous jacking devices (8).
3. the movable propeller turbine runner static balance test device according to claim 1 based on stress rods method,
Be characterized in that: the foil gauge group (5) includes the first foil gauge (501) for being arranged symmetrically in stress rods (6) same cross section, the
Two foil gauges (502), third foil gauge (503) and the 4th foil gauge (504).
4. the movable propeller turbine runner static balance test device according to claim 1 based on stress rods method,
It is characterized in that: connector (1) being installed at the top of the web (2).
5. the movable propeller turbine runner static balance test device according to claim 3 based on stress rods method,
Be characterized in that: first foil gauge (501) and third foil gauge (503) are connected using half-bridge connection, and one favour of composition this
Step on electric bridge.
6. the movable propeller turbine runner static balance test device according to claim 3 based on stress rods method,
Be characterized in that: second foil gauge (502) and the 4th foil gauge (504) are connected using half-bridge connection, and one favour of composition this
Step on electric bridge.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540389A (en) * | 2019-01-10 | 2019-03-29 | 中国长江电力股份有限公司 | Movable propeller turbine runner static balance test device and method based on stress rods method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540389A (en) * | 2019-01-10 | 2019-03-29 | 中国长江电力股份有限公司 | Movable propeller turbine runner static balance test device and method based on stress rods method |
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