CN113340204A - Method for measuring turbine hot part based on laser measuring instrument - Google Patents
Method for measuring turbine hot part based on laser measuring instrument Download PDFInfo
- Publication number
- CN113340204A CN113340204A CN202110795626.6A CN202110795626A CN113340204A CN 113340204 A CN113340204 A CN 113340204A CN 202110795626 A CN202110795626 A CN 202110795626A CN 113340204 A CN113340204 A CN 113340204A
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- Prior art keywords
- laser
- laser beam
- measuring instrument
- blade
- measuring
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000005070 sampling Methods 0.000 claims abstract description 7
- 230000003068 static effect Effects 0.000 claims description 7
- CPBQJMYROZQQJC-UHFFFAOYSA-N helium neon Chemical compound [He].[Ne] CPBQJMYROZQQJC-UHFFFAOYSA-N 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention relates to the technical field of turbine hot part measurement, in particular to a method for measuring a turbine hot part based on a laser measuring instrument, which comprises the following steps: s1, respectively sampling points at two ends between the movable blade and the stationary blade, between the shaft neck and the shaft seal, between the bearing bush and the oil baffle by using target balls; s2, emitting a stable laser beam at the target ball position on the driven blade by using a laser measuring instrument, reflecting the laser beam after the laser beam reaches the target ball on the stationary blade, and recording the time t1 for reflection. The laser tracker measurement technology is applied to the maintenance of the steam turbine body, the damage probability of some parts of the cylinder body in the repeated disassembly and assembly process is avoided, the measurement is simple, the data is easy to obtain, the data is very easy to analyze, the defect treatment, the gap adjustment and the like of the parts are pertinently performed, the traditional detection mode is equivalent, the working time is saved, and the maintenance period is shortened.
Description
Technical Field
The invention relates to the technical field of turbine hot part measurement, in particular to a method for measuring a turbine hot part based on a laser measuring instrument.
Background
The steam turbine is the most important equipment for converting thermal energy into kinetic energy in a thermal power plant, high-temperature and high-pressure superheated steam produced by a boiler is guided into a steam chamber of the steam turbine, 28 stages of blades on a rotor are gradually impacted after the steam flow direction is adjusted, the rotor can rotate, and the steam turbine rotor and a generator rotor are also rigidly connected through a coupler to drive a generator to rotate so as to be converted into electric energy.
In the overhaul of the steam turbine body, in order to make the dynamic and static clearance values of each stage reach the standard value, the relative sizes between each movable blade and each static blade, between each journal and a shaft seal, between each journal and a bearing bush, and between each journal and an oil stop need to be measured, and the difference value is calculated, namely the dynamic and static clearance values before overhaul. The measurement of the dynamic clearance and the static clearance is the basic work in the overhaul of the steam turbine body, and is the prerequisite work for ensuring the overhaul quality. The traditional method for measuring the parts comprises the steps of wrapping adhesive tapes, pressing lead wires and directly measuring by using a feeler gauge or an inside micrometer. However, the conventional measurement method has large error and needs to be repeatedly measured, so a method for measuring the hot component of the steam turbine based on a laser measuring instrument is provided for solving the problems.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a method for measuring a hot part of a steam turbine based on a laser measuring instrument.
A method for measuring a hot part of a steam turbine based on a laser measuring instrument comprises the following steps:
s1, respectively sampling points at two ends between the movable blade and the stationary blade, between the shaft neck and the shaft seal, between the bearing bush and the oil baffle by using target balls;
s2, emitting a stable laser beam at the target ball position on the driven blade by using a laser measuring instrument, reflecting the laser beam after the laser beam reaches the target ball on the stationary blade, and recording the time t1 for reflection;
s3, emitting three stable laser beams from the position of the target ball on the shaft neck by using a laser measuring instrument, reflecting the three laser beams after the three laser beams reach the target ball on the shaft seal, the bearing bush and the oil baffle respectively, and recording the time t2, t3 and t4 for reflection;
and S4, calculating the clearance distances between the movable blade and the stationary blade, between the shaft neck and the shaft seal, between the shaft neck and the bearing bush and between the shaft neck and the oil stop according to the D ═ Vx (T/2), recording the clearance distances, repeating the steps from S1 to S4 for 1 to 2 times, and taking the average value as the dynamic and static clearance value.
Preferably, the sampling position is the center of the movable blade, the fixed blade, the shaft neck, the shaft seal, the bearing bush and the oil baffle.
Preferably, in S4, D is a gap distance, V is a speed of the laser beam, and T is a time taken for the laser beam to reflect.
Preferably, the laser beam is a helium neon laser beam.
Compared with the prior art, the invention has the beneficial effects that:
the laser tracker measurement technology is applied to the maintenance of the steam turbine body, the damage probability of some parts of the cylinder body in the repeated disassembly and assembly process is avoided, the measurement is simple, the data is easy to obtain, the data is very easy to analyze, the defect treatment, the gap adjustment and the like of the parts are pertinently performed, the traditional detection mode is equivalent, the working time is saved, and the maintenance period is shortened.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
A method for measuring a hot part of a steam turbine based on a laser measuring instrument comprises the following steps:
s1, respectively sampling two ends between the movable blade and the fixed blade, between the shaft neck and the shaft seal, between the bearing bush and between the shaft blocks by using the target balls, wherein the sampling positions are the centers of the movable blade, the fixed blade, the shaft neck, the shaft seal, the bearing bush and the oil blocks;
s2, emitting a stable helium neon laser beam at the target ball position on the driven blade by using a laser measuring instrument, reflecting the laser beam after the laser beam reaches the target ball on the stationary blade, and recording the time t1 for reflection;
s3, emitting three stable helium neon laser beams from the position of the target ball on the shaft neck by using a laser measuring instrument, reflecting the three laser beams after the three laser beams reach the target ball on the shaft seal, the bearing bush and the oil baffle respectively, and recording the time t2, t3 and t4 for reflection;
and S4, calculating the gap distances between the movable blade and the stationary blade, between the shaft neck and the shaft seal, between the shaft neck and the bearing bush, and between the shaft neck and the oil baffle according to D ═ Vx (T/2), wherein D is the gap distance, V is the speed of the laser beam, and T is the time taken by the laser beam to reflect, recording, repeating the steps S1-S4 for 1-2 times, and taking the average value as the dynamic and static gap value.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. A method for measuring a hot part of a steam turbine based on a laser measuring instrument is characterized by comprising the following steps:
s1, respectively sampling points at two ends between the movable blade and the stationary blade, between the shaft neck and the shaft seal, between the bearing bush and the oil baffle by using target balls;
s2, emitting a stable laser beam at the target ball position on the driven blade by using a laser measuring instrument, reflecting the laser beam after the laser beam reaches the target ball on the stationary blade, and recording the time t1 for reflection;
s3, emitting three stable laser beams from the position of the target ball on the shaft neck by using a laser measuring instrument, reflecting the three laser beams after the three laser beams reach the target ball on the shaft seal, the bearing bush and the oil baffle respectively, and recording the time t2, t3 and t4 for reflection;
and S4, calculating the clearance distances between the movable blade and the stationary blade, between the shaft neck and the shaft seal, between the shaft neck and the bearing bush and between the shaft neck and the oil stop according to the D ═ Vx (T/2), recording the clearance distances, repeating the steps from S1 to S4 for 1 to 2 times, and taking the average value as the dynamic and static clearance value.
2. The method for measuring the hot parts of the steam turbine based on the laser measuring instrument as claimed in claim 1, wherein the sampling position is the center of a movable blade, a stationary blade, a shaft neck, a shaft seal, a bearing bush and an oil baffle.
3. The method for measuring the hot parts of the steam turbine based on the laser measuring instrument as claimed in claim 1, wherein D in S4 is the gap distance, V is the speed of the laser beam, and T is the time taken for the laser beam to reflect.
4. The method for measuring the hot parts of the steam turbine based on the laser measuring instrument as claimed in claim 1, wherein the laser beam is a helium neon laser beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110795626.6A CN113340204A (en) | 2021-07-14 | 2021-07-14 | Method for measuring turbine hot part based on laser measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110795626.6A CN113340204A (en) | 2021-07-14 | 2021-07-14 | Method for measuring turbine hot part based on laser measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113340204A true CN113340204A (en) | 2021-09-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110795626.6A Pending CN113340204A (en) | 2021-07-14 | 2021-07-14 | Method for measuring turbine hot part based on laser measuring instrument |
Country Status (1)
| Country | Link |
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| CN (1) | CN113340204A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0486308A (en) * | 1990-07-31 | 1992-03-18 | Toshiba Corp | Steam-cooling gas turbine combined plant |
| CN102944170A (en) * | 2012-08-30 | 2013-02-27 | 哈尔滨汽轮机厂有限责任公司 | Method for carrying out alignment on stator part sleeves of steam turbine by utilizing laser tracker |
| CN203856517U (en) * | 2014-01-26 | 2014-10-01 | 国家电网公司 | Steam turbine internal cylinder capable of measuring dynamic and static clearance |
| CN105526878A (en) * | 2016-01-16 | 2016-04-27 | 东北电力大学 | Real-time dynamic measurement method for measuring radial clearance between steam turbine rotor and stator |
| CN105783753A (en) * | 2016-03-10 | 2016-07-20 | 哈尔滨汽轮机厂有限责任公司 | Method for measuring steam turbine rotor deflection by using laser tracker |
-
2021
- 2021-07-14 CN CN202110795626.6A patent/CN113340204A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0486308A (en) * | 1990-07-31 | 1992-03-18 | Toshiba Corp | Steam-cooling gas turbine combined plant |
| CN102944170A (en) * | 2012-08-30 | 2013-02-27 | 哈尔滨汽轮机厂有限责任公司 | Method for carrying out alignment on stator part sleeves of steam turbine by utilizing laser tracker |
| CN203856517U (en) * | 2014-01-26 | 2014-10-01 | 国家电网公司 | Steam turbine internal cylinder capable of measuring dynamic and static clearance |
| CN105526878A (en) * | 2016-01-16 | 2016-04-27 | 东北电力大学 | Real-time dynamic measurement method for measuring radial clearance between steam turbine rotor and stator |
| CN105783753A (en) * | 2016-03-10 | 2016-07-20 | 哈尔滨汽轮机厂有限责任公司 | Method for measuring steam turbine rotor deflection by using laser tracker |
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| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20210903 |