CN110285748A - Tip clearance calibration measuring system and method based on shrouded blade coupling feature - Google Patents
Tip clearance calibration measuring system and method based on shrouded blade coupling feature Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
- G01B7/15—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures being regularly spaced
Abstract
The present invention discloses a kind of tip clearance calibration measuring system and method based on shrouded blade coupling feature, system includes steam turbine and shrouded blade, further includes current vortex sensor, signal conditioning module, signal condition integrated host, signal acquisition module, signal acquisition integrated host and computer；The current vortex sensor is connected by sensor signal lines with signal conditioning module, the signal acquisition module is connected by connecting line with signal conditioning module, the signal acquisition module is connected by connecting line with computer, the signal conditioning module is placed in signal condition integrated host, and the signal acquisition module is placed in signal acquisition integrated host；The shrouded blade is installed in the three-dimensional mobile station, passes through the movement of three-dimensional mobile station described in motor control；The current vortex sensor is installed on the static casing of steam turbine when for measuring, and the current vortex sensor is fixed on above shrouded blade when for demarcating.
Description
Technical field
The invention belongs to electric vortex type Technology of Precision Measurement fields more particularly to a kind of based on shrouded blade coupling feature
Electric vortex type tip clearance demarcates measuring system and method.
Background technique
As power plant develops toward high-power, intelligent, safe and reliable direction, turbine blade is as acting core component
The load of receiving becomes increasingly complex.Especially in current flexibility power peak regulation application, the unstable working condition of blade,
Such as load, revolving speed, pressure, humidity cause blade fault occurrence probability to increase.Therefore real-time status is carried out to turbine blade
The safety in operation and efficiency of unit can be improved in monitoring, extends maintenance period.Reduce maintenance cost.
The principal states parameter of blade is blade radial displacement, circumferentially displaced and deflection, and wherein radial displacement is directly determined
Determine the variation of tip clearance.Tip clearance is the important parameter for influencing steam turbine performance, and tip clearance is excessive to will lead to steam turbine
Efficiency decline, or even surge can be caused；Tip clearance is too small, will lead to the friction between blade and casing, generates failure, influences vapour
Turbine operational security.Therefore by tip clearance control in optimum range, guarantee that unit is run under highly effective and safe state
Effective measures.
Tip clearance measuring technique is mounted on sensor on the static casing of rotating machinery, realizes blade tip away from sensor
The measurement of gap width.Current measurement method includes electric discharge sonde method, laser triangulation, fiber optic bundle method, capacitance method etc..Electric discharge is visited
The skill of handling needles can be 600 DEG C of heatproof, and Measurement Resolution is about 10um, but can only measure the vaned minimum tip clearance of institute and cannot be real-time
On-line measurement is suitable only for the measurement of tip clearance under jiggering working condition；Laser triangulation can realize hot environment (environment temperature
Higher than 1000 DEG C) under high speed measurement, precision is about 30-50um, but sensor bulk is larger, be not suitable for in-site installation, and should
System is more suitable for detecting blade tip maximal clearance, should not be used in single tip clearance value and gap average detection；Fiber optic bundle method
Probe size is small, relatively simple for structure, and resolving power is higher with sensitivity, bandwidth, and dynamic response is good, but its measurement result vulnerable to
It is tested the influence of blade reflection coefficient, the setting angle of sensor, installation site and working sensor environment；Capacitance method is based on
Parallel plate capacitance principle realizes the measurement of tip clearance by the capacitor between measurement sensor electrode and rotator tip, usually
Gap capacitance value is within 1pF, it is therefore desirable to the signal processing circuit of high s/n ratio, while the influence vulnerable to working environment.
Electric vortex method is compared with the above method, overcomes electric discharge sonde method, laser triangulation, fiber optic bundle method and capacitance method etc.
The constraint that sensing technology is influenced by unit running environment and operating condition variation has structure simple, and signal-to-noise ratio is high, and frequency response is fast,
The advantages of capable of working in the environment of relatively polluting, therefore it is very suitable to the monitoring of power plant steam turbine blade state, work with higher
Journey more practical value.
Meanwhile although electric vortex method has certain temperature condition limitation, its operating temperature (260 DEG C or less) is much full
The operating environment requirements of sufficient power plant steam turbine blade.
Summary of the invention
Purpose of the invention is to overcome the shortcomings in the prior art, provides a kind of based on shrouded blade coupling feature
Tip clearance demarcates measuring system and method, and the present invention is based on electric eddy current measurement principles, using the coupling feature of shrouded blade, if
Meter shrouded blade tip clearance calibration system and scaling scheme are to obtain shrouded blade tip clearance-voltage calibration curve and mark
Determine coefficient.Band hat leaf is built according to electric eddy current measurement principle and shrouded blade tip clearance-voltage calibration curve and calibration coefficient
Piece tip clearance measuring system realizes the real-time measurement to steam turbine shrouded blade tip clearance.It can accurately measure steam turbine band
The tip clearance of shroud blade when rotating at high speed meets real-time monitoring of the power plant in steam turbine shrouded blade high speed rotation and wants
It asks, guarantees the security reliability of power plant's work, reduce the brings increased costs such as shutdown inspection, improve the economic benefit of power plant.
The purpose of the present invention is what is be achieved through the following technical solutions:
Tip clearance based on shrouded blade coupling feature demarcates measuring system, including steam turbine and shrouded blade, also wraps
Include current vortex sensor, signal conditioning module, signal condition integrated host, signal acquisition module, signal acquisition integrated host and
Computer；The current vortex sensor is connected by sensor signal lines with signal conditioning module, and the signal acquisition module is logical
It crosses connecting line to be connected with signal conditioning module, the signal acquisition module is connected by connecting line with computer, the signal tune
Reason module is placed in signal condition integrated host, and the signal acquisition module is placed in signal acquisition integrated host；It is described
Shrouded blade is installed in the three-dimensional mobile station, passes through the movement of three-dimensional mobile station described in motor control；Institute when for measuring
It states current vortex sensor to be installed on the static casing of steam turbine, the current vortex sensor is fixed on band hat leaf when for demarcating
Above piece.
Further, at least two modules are respectively placed in the signal condition integrated host and signal acquisition integrated host
To realize that multi-channel synchronous measures.
Another technical solution of the invention is the tip clearance measurement method based on shrouded blade coupling feature, specifically such as
Under:
According to real work situation, it is installed on the impedance Z of the current vortex sensor probe coil on the static casing of steam turbine
By gap d and shrouded blade size factor K collective effect, it is believed that the other influences factor is in changeless state；Then impedance Z
It is represented by with the relationship of gap d, shrouded blade size factor K
Z=f (d, K) (1)
Simultaneously as when rotated, it can be alternately across current vortex sensor at the coupling of shrouded blade and shrouded blade
Probe enables shrouded blade size factor K be expressed as (K at shrouded blade according to the practical shrouded blade that probe is experienced1+
K2), K is expressed as at shrouded blade coupling1, then impedance Z when by shrouded blade1It is represented by
Z1=f (d, K1+K2)=f (d, K1)+f(d,K2) (2)
When by shrouded blade coupling, impedance Z2It is represented by
Z2=f (d, K1) (3)
Therefore when steam turbine work, every to pass through at a shrouded blade and its coupling, impedance variation amount Δ Z is represented by
Δ Z=Z1-Z2=f (d, K2) (4)
Simultaneously as size factor K1And K2It is fixed and invariable, therefore the coupling feature based on shrouded blade, by impedance
Variation delta Z converts for the monotropic function relationship with gap d, i.e., is expressed as formula (4)
Δ Z=f (d) (5)
The tip clearance d of shrouded blade is characterized by current vortex sensor probe coil impedance variation amount Δ Z；
Voltage when the gap of probe and shrouded blade is d, and is located at shrouded blade is V1, it is located at shrouded blade coupling
Voltage when at conjunction is V2, voltage variety Δ V is expressed as at this time
Δ V=V1-V2 (6)
It is the monodrome of voltage variety Δ V and gap d by impedance variation amount Δ Z and the monotropic function transformation of gap d
Functional relation, i.e.,
Δ V=f (d) (7)
Gap d inverse function can be obtained by formula (7)
D=f (Δ V) (8)
Shrouded blade tip clearance d can be measured by voltage variety Δ V by the monotropic function relationship of formula (8)；Tool
Body the following steps are included:
(1) shrouded blade tip clearance measurement method based on the above principles carries out calibration early period, to obtain different blade tips
The corresponding voltage variety Δ V of gap d, is fitted to polynomial equation, obtains monotropic function relationship d=f (Δ V), for existing
It is compared when field measurement and finally obtains gap data；
(2) aperture on the static casing of steam turbine, current vortex sensor is installed in aperture, current vortex sensor
Probe tip face is parallel with shrouded blade end face；
(3) current vortex sensor is connect by sensor connecting line with signal conditioning module, signal conditioning module passes through
Connecting line is connected with signal acquisition module, and signal acquisition module is connected by connecting line with computer；
(4) steam turbine starts work, and shrouded blade starts to rotate, with gradually increasing for revolving speed, shrouded blade and with hat
It is every by primary probe at blade coupling, i.e., it can generate an impedance change, AZ；
(5) the impedance Z live signal that current vortex sensor is popped one's head in is input to signal by current vortex sensor connecting line
Handled in conditioning module, be converted into voltage V live signal and reject be input in signal acquisition module after unfavorable factor into
Row storage, is input in computer later, voltage variety is obtained by calculation in voltage V live signal by Signal Pretreatment
Δ V, then the monotropic function relationship f of voltage variety Δ V and tip clearance d that is obtained by calibration equation is by voltage variety Δ
V is processed into tip clearance d, completes the measurement of shrouded blade tip clearance.
The method demarcated in step (1) is as follows:
(101) current vortex sensor is fixed on above shrouded blade, and the sound end of current vortex sensor is ensured through overregulating
Face is parallel with shrouded blade end face, and current vortex sensor is connected by sensor connecting line with signal conditioning module, signal condition
Module is connected by connecting line with signal acquisition module, and signal acquisition module is connected by connecting line with computer, to guarantee to believe
Number effective transmission；
(102) by electric motor control three-dimensional displacement platform, make three-D displacement platform in x-axis direction uniform motion, pass through signal tune
Module, signal acquisition module and computer real-time monitoring output voltage waveforms curve are managed, includes logical on output voltage waveforms curve
Cross the voltage V at shrouded blade1With pass through the voltage V at shrouded blade coupling2, voltage variety Δ V is obtained by calculation；
(103) gap for changing current vortex sensor and shrouded blade, repeats (102) step, obtains shrouded blade difference
The corresponding voltage variety Δ V of tip clearance, is fitted to polynomial equation by least square method, obtains voltage variety Δ V
With the monotropic function relationship f of tip clearance d.
Compared with prior art, the beneficial effects brought by the technical solution of the present invention are as follows:
1. the present invention uses electric vortex sensor measuring power plant steam turbine shrouded blade tip clearance, solve in power plant's vapour
Contain a large amount of vapor in turbine shrouded blade working environment, how to be realized under the premise of working environment is more severe and leaf is preced with to band
The problem of piece tip clearance measures；
2. shrouded blade tip clearance calibration system and scaling scheme can be designed by the method for the invention, shrouded blade is obtained
Tip clearance d- voltage variety Δ V calibration curve, obtains voltage variety Δ V's and tip clearance d by fitting of a polynomial
Monotropic function relationship f can effectively improve the accuracy of shrouded blade tip clearance measurement as the comparison foundation of in-site measurement.
3. steam turbine shrouded blade tip clearance measuring system can be built by the method for the invention, realizes and steam turbine band is preced with
The real-time measurement of blade-tip clearance.It can accurately measure the tip clearance of steam turbine shrouded blade when rotating at high speed, meet electricity
Real-time monitoring requirement of the factory in steam turbine shrouded blade high speed rotation, guarantees the security reliability of power plant's work, reduces and shut down
The brings increased costs such as inspection, improve the economic benefit of power plant.
Detailed description of the invention
Fig. 1 is the electric vortex type tip clearance measurement method schematic illustration based on shrouded blade coupling feature.
Fig. 2 is the structural schematic diagram of calibration system in specific embodiment.
Fig. 3 is the voltage waveform figure of calibration output.
Fig. 4 is shrouded blade tip clearance d- voltage variety Δ V calibration curve schematic diagram.
Fig. 5 is the structural schematic diagram of measuring system in specific embodiment.
Fig. 6 is the work flow diagram measured in specific embodiment.
Appended drawing reference: 1- shrouded blade, 2- current vortex sensor, 3- signal conditioning module, 4- signal acquisition module, 5- meter
Calculation machine, 6- shrouded blade erecting bed, 7- three-dimensional mobile station, 8- motor, 9- steam turbine casing, 10- signal condition integrated host,
11- signal acquisition integrated host
Specific embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.It should be appreciated that described herein
Specific embodiment be only used to explain the present invention, be not intended to limit the present invention.
The present invention provides electric vortex type tip clearance calibration system and measuring system based on shrouded blade coupling feature, packet
Include shrouded blade 1, steam turbine casing 9, current vortex sensor 2, signal conditioning module 3, signal acquisition module 4, computer 5, letter
Number conditioning integrated host 10, signal acquisition integrated host 11, shrouded blade erecting bed 6, three-dimensional mobile station 7 and motor 8.
In calibration system, current vortex sensor 2 is fixed on 1 top of shrouded blade, and shrouded blade 1 is installed on shrouded blade
On erecting bed 6, shrouded blade erecting bed 6 is installed in three-dimensional mobile station 7, and three-dimensional mobile station 7 is connected with motor 8, and current vortex passes
Sensor 2 is connected by sensor connecting line with signal conditioning module 3, and signal conditioning module 3 passes through connecting line and signal acquisition mould
Block 4 is connected, and signal acquisition module 4 is connected by connecting line with computer 5.
In measuring system, current vortex sensor 2 is installed on steam turbine casing 9, and current vortex sensor 2 passes through sensor
Connecting line is connected with signal conditioning module 3, and signal conditioning module 3 is connected by connecting line with signal acquisition module 4, signal acquisition
Module 4 is connected by connecting line with computer 5, and signal conditioning module 3 is placed in signal condition integrated host 10, signal acquisition
Module 4 is placed in signal acquisition integrated host 11.
According to electric vortex sensor measuring principle, when importing an alternating current I to current vortex sensor probe coil, online
A magnetic field is formed around circle.If there is metallic conductor enters this magnetic field, current vortex can be generated between metallic conductor and probe,
The magnetic field of magnetic direction and coil itself is on the contrary, can change the impedance value Z of current vortex sensor probe coil, the change of impedance value Z
Change is converted into voltage change after signal condition.The magnetic permeability μ of impedance value Z and metallic conductor, conductivity δ, the width of alternating current
Value I, frequency f, the gap d between current vortex sensor probe and metallic conductor, metallic conductor size factor K and probe size because
Sub- K' is related, i.e. impedance can be indicated with function Z=f (μ, δ, I, f, d, K, K').
It since shrouded blade structure is special, can be mutually coupled when rotated between each shrouded blade, shrouded blade and with hat
Can be alternately across the probe of current vortex sensor at the coupling of blade, therefore other 6 parameter perseverances of traditional control can not be used
It is fixed constant, enable impedance Z become the measurement of method progress tip clearance of the monotropic function of running parameter gap d.Therefore there is this
Invent the electric vortex type tip clearance measurement method based on shrouded blade coupling feature proposed.Referring to Fig.1, the principle is as follows:
According to real work situation, it is installed on the impedance Z of the current vortex sensor probe coil on the static casing of steam turbine
By gap d and shrouded blade size factor K collective effect, the other influences factor is believed that in changeless state.Therefore
The relationship of impedance Z and gap d, shrouded blade size factor K is represented by
Z=f (d, K) (1)
Simultaneously as when rotated, it can be alternately across current vortex sensor at the coupling of shrouded blade and shrouded blade
Probe can enable shrouded blade size factor K be expressed as (K at shrouded blade according to the practical shrouded blade that probe is experienced1+
K2), K is expressed as at shrouded blade coupling1, therefore impedance Z when by shrouded blade1It is represented by
Z1=f (d, K1+K2)=f (d, K1)+f(d,K2) (2)
When by shrouded blade coupling, impedance Z2It is represented by
Z2=f (d, K1) (3)
Therefore when steam turbine work, every to pass through at a shrouded blade and its coupling, impedance variation amount Δ Z is represented by
Δ Z=Z1-Z2=f (d, K2) (4)
Simultaneously as size factor K1And K2It is fixed and invariable, therefore the coupling feature based on shrouded blade, by impedance
Variation delta Z converts for the monotropic function relationship with gap d, can be expressed as formula (4)
Δ Z=f (d) (5)
The tip clearance d of shrouded blade can be characterized by current vortex sensor probe coil impedance variation amount Δ Z.
Simultaneously as the difficulty for directly measuring impedance Z is higher, therefore voltage can be converted by signal conditioning module
V is measured again.Voltage as shown in Figure 1, when probe and the gap of shrouded blade are d, and when being located at shrouded blade is V1,
Voltage when at shrouded blade coupling is V2, voltage variety Δ V is represented by this time
Δ V=V1-V2 (6)
Therefore the monotropic function relationship of impedance variation amount Δ Z and gap d can be converted into voltage variety Δ V and gap d
Monotropic function relationship, i.e.,
Δ V=f (d) (7)
Its inverse function can be obtained by formula (7)
D=f (Δ V) (8)
The present embodiment builds band hat leaf by the electric vortex type tip clearance measurement method based on shrouded blade coupling feature
Piece tip clearance calibration system and scaling scheme obtain shrouded blade tip clearance d- voltage variety Δ V calibration curve, and set
Shrouded blade tip clearance measuring system is counted, realizes the real-time measurement to steam turbine shrouded blade tip clearance.It can accurately measure
It is real-time in steam turbine shrouded blade high speed rotation to meet power plant for the tip clearance of steam turbine shrouded blade when rotating at high speed
Detection requirement guarantees the security reliability of power plant's work, reduces the brings increased costs such as shutdown inspection, improves the economy of power plant
Benefit.Specific embodiment is as follows:
(1) shrouded blade tip clearance calibration system is built.
Power plant scene, steam turbine final blade leaf top diameter in 4m or more, work revolving speed up to 3000rpm with
On, reach 628m/s or more by can be calculated linear velocity at shrouded blade blade tip.Shrouded blade blade tip occlusal position is long simultaneously
Degree is 0.1m or so, and current vortex sensor probe diameter is 0.03m, and shrouded blade blade tip occlusal position length is passed by current vortex
The time of sensor probe is 0.207ms, it can thus be assumed that blade tip occlusal position passes through steam turbine shrouded blade when rotating at high speed
Current vortex sensor probe Shi Weiyi horizontal linear.
Shrouded blade tip clearance calibration system is built based on this, sees that Fig. 2, shrouded blade 1 are high with steam turbine shrouded blade
Occlusal position when speed rotation is fixed on shrouded blade erecting bed 6.Three-dimensional mobile station 7 can realize that shrouded blade erecting bed 6 exists
The movement of x, y, z both direction.Motor 8 can drive the x-axis direction of three-dimensional mobile station 7 to realize shrouded blade erecting bed 6 in x-axis side
To uniform motion, to simulate shrouded blade direction of rotation.
Current vortex sensor 2 is fixed on 1 top of shrouded blade, and probe tip face and shrouded blade end face need to be guaranteed by being adjusted
In parallel, current vortex sensor 2 is connected by sensor connecting line with signal conditioning module 4, and signal conditioning module 4 passes through connecting line
It is connected with signal acquisition module 4, signal acquisition module 4 is connected by connecting line with computer 5, to guarantee effective biography of signal
It is defeated.
The x-axis analog band hat for the three-dimensional mobile station 7 in shrouded blade tip clearance calibration system that the present invention is built
Vertical position of the current vortex sensor 2 relative to shrouded blade 1 is adjusted in blade direction of rotation, y-axis, and current vortex is adjusted in z-axis
Gap between sensor 2 and shrouded blade 1, therefore can meet between different installation requirements and the shrouded blade blade tip of calibration request
Gap calibration.
(2) enter shrouded blade tip clearance demarcation flow.
1. determining the relative position of current vortex sensor 2 Yu shrouded blade 1 with true installation requirement.It is adjusted and is protected by y-axis
Card current vortex sensor 2 and the relative position of shrouded blade 1 are consistent with true installation requirement, and the purpose of this step is to protect
Demonstrate,prove the accuracy of calibration.
2. controlling three-dimensional mobile station 7 by motor 8, makes it in x-axis direction uniform motion, pass through signal conditioning module 3, letter
Number 5 real-time monitoring output voltage waveforms curve of acquisition module 4 and computer.See Fig. 3, a voltage variety can be obtained by the curve
Δ V, the voltage variety Δ V are the voltage change generated due to tip clearance d and shrouded blade coupling feature, correspond to one
Tip clearance d.
3. changing the gap of current vortex sensor 2 and shrouded blade 1, repeatedly the 2. walks, different shrouded blades can be obtained
The one-to-one relationship of tip clearance d and voltage variety Δ V, are shown in Fig. 4, are fitted by least square method, can be fitted to more than one
Item formula equation, obtains the monotropic function relationship f of voltage variety Δ V and tip clearance d.The correlativity of the equation reaches
0.999 or more, illustrate the calibration curve and its monodrome that the shrouded blade tip clearance calibration system built through the invention obtains
Functional relation f can be used as the correspondence foundation of the tip clearance d- voltage variety Δ V of shrouded blade tip clearance measuring system.
(3) shrouded blade tip clearance measuring system is built.
See that Fig. 5, current vortex sensor 2 are installed on static steam turbine casing 9, make the shrouded blade 1 of the whole circle of its face,
Current vortex sensor 2 is connected by sensor connecting line with signal conditioning module 3, and signal conditioning module 3 passes through connecting line and letter
Number acquisition module 4 is connected, and signal acquisition module 4 is connected by connecting line with computer 5.
Shrouded blade tip clearance measuring system and calibration system difference be accuracy in order to guarantee data acquisition and
Integrality, measuring system use the installation method of multisensor measurement, it is therefore desirable to which multiple signal conditioning modules 3 are placed on letter
Number conditioning integrated host 10 in, multiple signal acquisition modules 4 are placed in signal acquisition integrated host 11.The work of integrated host
With to guarantee the normal work of each module for each module centrally connected power supply；Make each module integration standard, realizes at multimode synchronization
Reason, improves the accuracy of measurement of module.
(4) measurement of shrouded blade tip clearance is realized.
See Fig. 6, the actual gap of shrouded blade 1 and current vortex sensor 2 is d0, steam turbine starting work, shrouded blade 1
Start to rotate, revolving speed gradually increases.It is every primary by current vortex sensor 2 at the coupling of shrouded blade 1, an impedance can be generated
Change Delta Z.
The real-time change signal of impedance Z is transferred in signal conditioning module 3 and handles by sensor connecting line, is converted into
The real-time change signal of voltage V by unfavorable factors such as cancelling noises as shown in Figure 4, then will be conditioned by connecting line
Voltage V real-time change signal be input in signal acquisition module 4.
Voltage V real-time change signal is transferred in computer 5 later, carries out data processing.Have at data in computer 5
It manages software and the voltage variety Δ V of each real-time voltage signal is calculated by Signal Pretreatment first, then marked by early period
Determine the monotropic function relationship f that device obtains to substitute into voltage variety Δ V, the corresponding band hat of voltage variety Δ V can be obtained
Blade-tip clearance d, to realize shrouded blade tip clearance value d in steam turbine0Voltage value Δ V- data processing obtains blade tip
The complete set calculation process of gap d.
The present invention is not limited to embodiments described above.Above the description of specific embodiment is intended to describe and say
Bright technical solution of the present invention, the above mentioned embodiment is only schematical, is not restrictive.This is not being departed from
In the case of invention objective and scope of the claimed protection, those skilled in the art may be used also under the inspiration of the present invention
The specific transformation of many forms is made, within these are all belonged to the scope of protection of the present invention.
Claims (4)
1. the tip clearance based on shrouded blade coupling feature demarcates measuring system, including steam turbine and shrouded blade, feature
It is, further includes current vortex sensor, signal conditioning module, signal condition integrated host, signal acquisition module, signal acquisition collection
At host and computer；The current vortex sensor is connected by sensor signal lines with signal conditioning module, and the signal is adopted
Collection module is connected by connecting line with signal conditioning module, and the signal acquisition module is connected by connecting line with computer, institute
It states signal conditioning module to be placed in signal condition integrated host, the signal acquisition module is placed in signal acquisition integrated host
In；The shrouded blade is installed in the three-dimensional mobile station, passes through the movement of three-dimensional mobile station described in motor control；For surveying
The current vortex sensor is installed on the static casing of steam turbine when amount, and the current vortex sensor is fixed on when for demarcating
Above shrouded blade.
2. the tip clearance based on shrouded blade coupling feature demarcates measuring system according to claim 1, which is characterized in that
At least two modules are placed in the signal condition integrated host and signal acquisition integrated host respectively to realize multi-channel synchronous
Measurement.
3. the tip clearance measurement method based on shrouded blade coupling feature is surveyed based on the calibration of tip clearance described in claim 1
Amount system, which is characterized in that
According to real work situation, be installed on the impedance Z of the current vortex sensor probe coil on the static casing of steam turbine by
Gap d and shrouded blade size factor K collective effect, it is believed that the other influences factor is in changeless state；Then impedance Z and
Gap d, shrouded blade size factor K relationship be represented by
Z=f (d, K) (1)
Simultaneously as when rotated, at the coupling of shrouded blade and shrouded blade can alternately across the probe of current vortex sensor,
According to the practical shrouded blade that probe is experienced, shrouded blade size factor K is enabled to be expressed as (K at shrouded blade1+K2), in band
K is expressed as at shroud blade coupling1, then impedance Z when by shrouded blade1It is represented by
Z1=f (d, K1+K2)=f (d, K1)+f(d,K2) (2)
When by shrouded blade coupling, impedance Z2It is represented by
Z2=f (d, K1) (3)
Therefore when steam turbine work, every to pass through at a shrouded blade and its coupling, impedance variation amount Δ Z is represented by
Δ Z=Z1-Z2=f (d, K2) (4)
Simultaneously as size factor K1And K2It is fixed and invariable, therefore the coupling feature based on shrouded blade, by impedance variations
Δ Z conversion is measured for the monotropic function relationship with gap d, i.e., is expressed as formula (4)
Δ Z=f (d) (5)
The tip clearance d of shrouded blade is characterized by current vortex sensor probe coil impedance variation amount Δ Z；
Voltage when the gap of probe and shrouded blade is d, and is located at shrouded blade is V1, it is located at shrouded blade coupling
When voltage be V2, voltage variety Δ V is expressed as at this time
Δ V=V1-V2 (6)
It is the monotropic function of voltage variety Δ V and gap d by impedance variation amount Δ Z and the monotropic function transformation of gap d
Relationship, i.e.,
Δ V=f (d) (7)
Gap d inverse function can be obtained by formula (7)
D=f (Δ V) (8)
Shrouded blade tip clearance d can be measured by voltage variety Δ V by the monotropic function relationship of formula (8)；Specific packet
Include following steps:
(1) shrouded blade tip clearance measurement method based on the above principles carries out calibration early period, to obtain different tip clearances
The corresponding voltage variety Δ V of d, is fitted to polynomial equation, obtains monotropic function relationship d=f (Δ V), for surveying at the scene
It is compared when amount and finally obtains gap data；
(2) aperture on the static casing of steam turbine, current vortex sensor is installed in aperture, the probe of current vortex sensor
End face is parallel with shrouded blade end face；
(3) current vortex sensor is connect by sensor connecting line with signal conditioning module, signal conditioning module passes through connection
Line is connected with signal acquisition module, and signal acquisition module is connected by connecting line with computer；
(4) steam turbine starts work, and shrouded blade starts to rotate, with gradually increasing for revolving speed, shrouded blade and shrouded blade
It is every by primary probe at coupling, i.e., it can generate an impedance change, AZ；
(5) the impedance Z live signal that current vortex sensor is popped one's head in is input to signal condition by current vortex sensor connecting line
It is handled in module, is converted into voltage V live signal and rejects to be input in signal acquisition module after unfavorable factor and deposited
Storage, is input in computer later, voltage variety Δ V is obtained by calculation in voltage V live signal by Signal Pretreatment,
The monotropic function relationship f of the voltage variety Δ V and tip clearance d that are obtained again by calibration equation will be at voltage variety Δ V
Tip clearance d is managed into, the measurement of shrouded blade tip clearance is completed.
4. according to claim 3 based on the tip clearance measurement method of shrouded blade coupling feature, which is characterized in that step
(1) method demarcated in is as follows:
(101) current vortex sensor is fixed on above shrouded blade, overregulated ensure the probe tip face of current vortex sensor with
Shrouded blade end face is parallel, and current vortex sensor is connected by sensor connecting line with signal conditioning module, signal conditioning module
It is connected by connecting line with signal acquisition module, signal acquisition module is connected by connecting line with computer, to guarantee signal
Effectively transmission；
(102) by electric motor control three-dimensional displacement platform, make three-D displacement platform in x-axis direction uniform motion, pass through signal condition mould
Block, signal acquisition module and computer real-time monitoring output voltage waveforms curve, comprising passing through band on output voltage waveforms curve
Voltage V at shroud blade1With pass through the voltage V at shrouded blade coupling2, voltage variety Δ V is obtained by calculation；
(103) gap for changing current vortex sensor and shrouded blade, repeats (102) step, obtains shrouded blade difference blade tip
The corresponding voltage variety Δ V in gap, is fitted to polynomial equation by least square method, obtains voltage variety Δ V and leaf
The monotropic function relationship f of intercuspal space d.
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