CN211855202U - Complete set of calibration device for steam turbine differential expansion instrument - Google Patents
Complete set of calibration device for steam turbine differential expansion instrument Download PDFInfo
- Publication number
- CN211855202U CN211855202U CN202020335426.3U CN202020335426U CN211855202U CN 211855202 U CN211855202 U CN 211855202U CN 202020335426 U CN202020335426 U CN 202020335426U CN 211855202 U CN211855202 U CN 211855202U
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- China
- Prior art keywords
- differential expansion
- steam turbine
- expansion instrument
- guide rail
- connecting rod
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- Expired - Fee Related
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- 239000000523 sample Substances 0.000 claims abstract description 16
- 238000012795 verification Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004164 analytical calibration Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The utility model discloses a complete set of calibration equipment for a steam turbine differential expansion instrument, which comprises a fixed base, wherein a transverse guide rail is arranged on the fixed base, and a micrometer scale spiral pair is also arranged on the bottom edge; a movable sleeve is arranged on the transverse guide rail, a telescopic connecting rod penetrates through the movable sleeve, one end of the telescopic connecting rod is connected with the micrometer scale spiral pair, the other end of the telescopic connecting rod is connected with a mounting frame, and two differential expansion instrument probes are arranged on the mounting frame; the side of the fixed base is also provided with a magnetic attraction locking switch. The utility model discloses realize nimble adjustment current vortex poor instrument probe position of expanding, ensure the measuring accuracy.
Description
Technical Field
The utility model belongs to the technical field of the steam turbine is measured, concretely relates to poor instrument complete set calibration equipment of steam turbine expands.
Background
The steam turbine generally has the swell difference, including high pressure swell difference and low pressure swell difference, measures the steam turbine swell difference through the swell difference instrument, if appear the swell difference when exceeding the design limit value, then need shut down the unit, therefore the swell difference instrument measurement accuracy is especially important. One set of differential expansion instrument generally designs 2 electric eddy current differential expansion instrument probes and symmetrically arranges on the high-low pressure slope of the steam turbine, enlarges the measuring range according to the angle of the slope, and then calculates the actual differential expansion value according to the measured value of the 2 electric eddy current differential expansion instrument probes. Because the material of the measurement target surface of the slope surface of the pneumatic wheel has great influence on the sensitivity of the eddy current sensor, in order to ensure the measurement accuracy, the differential expansion instrument needs to be checked on line according to the material of the actual target surface, but the checking process of the relative expansion of the steam turbine cannot be simulated when the unit is stopped, so that the differential expansion instrument checking device capable of flexibly adjusting the position is urgently needed to be designed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a poor instrument complete set calibration equipment expands of steam turbine realizes nimble adjustment current vortex poor instrument probe position that expands, ensures the measuring accuracy.
The utility model discloses technical scheme as follows:
a complete set of calibration device for a steam turbine differential expansion instrument comprises a fixed base, wherein a transverse guide rail is arranged on the fixed base, and a micrometer scale spiral pair is also arranged on the bottom edge of the fixed base; a movable sleeve is arranged on the transverse guide rail, a telescopic connecting rod penetrates through the movable sleeve, one end of the telescopic connecting rod is connected with the micrometer scale spiral pair, the other end of the telescopic connecting rod is connected with a mounting frame, and two differential expansion instrument probes are arranged on the mounting frame; the side of the fixed base is also provided with a magnetic attraction locking switch.
The transverse guide rail is a dovetail groove guide rail.
The shape angle of the mounting frame is consistent with the surface angle of the slope of the turbine to be measured, when 2 eddy current differential expansion instrument probes are vertically mounted on the mounting frame, the differential expansion value of the slope surface of the turbine can also be vertically measured, and the measured differential expansion value is accurate.
During measurement, the fixing base of the calibration device is fixed on a turbine bearing box through the magnetic suction locking switch, a stable support is provided for the measurement device, the transverse position of the movable sleeve at the transverse dovetail groove guide rail is adjusted, the micrometer scale spiral pair is rotated, the telescopic connecting rod drives the mounting frame and the differential expansion instrument probe on the mounting frame to operate, the gap between the differential expansion instrument probe and the measurement target surface of the slope surface of the pneumatic wheel is adjusted, the adjustment error precision can reach 0.01mm, the calibration device stops when reaching a calibration set point, the calibration device records output data of the differential expansion instrument probe in the whole calibration process displayed in the upper computer, and the subsequent function correction is carried out on the measurement precision of the differential expansion instrument. The calibration device has the advantages of stable work, real simulation of the relative expansion amount of the steam turbine and the like, not only ensures the calibration precision of the instrument, but also can improve the calibration efficiency of the instrument.
The problem that an expansion difference instrument of a conventional steam turbine cannot be subjected to online complete calibration and the calibration precision cannot be guaranteed is solved. In the past, when a set of differential expansion instrument is verified, a single support needs to be verified and adjusted in position respectively, the time is about 1 hour, and when the verification device is used for verifying a set of differential expansion instrument, the time is only about 20 minutes. Meanwhile, the calibration device has the advantages of stable work, small return error and the like, and the maximum error precision of the calibration device can reach 0.01mm, so that the calibration precision is greatly improved compared with a common stroke instrument calibration device with the error precision of 0.1 mm. The improvement of the calibration precision is more beneficial to the working personnel to know and master the long-term characteristic change trend of the instrument.
Drawings
FIG. 1 is a schematic structural diagram of the present invention
The device comprises a fixed base 1, a transverse guide rail 2, a micrometer scale spiral pair 3, a movable sleeve 4, a telescopic connecting rod 5, a mounting rack 6, an expansion difference instrument probe 7 and a magnetic attraction locking switch 8.
Detailed Description
As shown in fig. 1, a complete set of calibration equipment for a steam turbine differential expansion instrument comprises a fixed base 1, wherein a transverse guide rail 2 is arranged on the fixed base 1, and a micrometer scale screw pair 3 is also arranged on the bottom edge; a movable sleeve 4 is arranged on the transverse guide rail 2, a telescopic connecting rod 5 penetrates through the movable sleeve 4, one end of the telescopic connecting rod 5 is connected with the micrometer scale screw pair 3, the other end of the telescopic connecting rod is connected with a mounting frame 6, and two differential expansion instrument probes 7 are arranged on the mounting frame 6; the side of the fixed base is also provided with a magnetic attraction locking switch 8.
The transverse guide rail 2 is a dovetail groove guide rail, and the shape angle of the mounting rack 6 is consistent with the slope surface angle of the turbine to be tested.
During measurement, the fixed base 1 of the checking device is fixed on a turbine bearing box through the magnetic attraction locking switch 8, a stable support is provided for the measuring device, the transverse position of the movable sleeve 4 on the transverse guide rail 2 is adjusted, the micrometer scale spiral pair 3 is rotated, the telescopic connecting rod 5 drives the mounting frame 6 and the differential expansion instrument probe 7 on the mounting frame to operate, the gap between the differential expansion instrument probe 7 and the measuring target surface of the slope surface of the pneumatic wheel is adjusted, the adjustment error precision can reach 0.01mm, the operation is stopped after the calibration set point is reached, the output data of the differential expansion instrument probe in the whole calibration process displayed in the upper computer is recorded by a calibrator, and the subsequent function correction is carried out on the measurement precision of the differential expansion instrument.
The above, only be the partial preferred embodiment of the present invention, not to the limitation of the present invention in any form, any not break away from the technical solution content of the present invention, according to the present invention, any simple modification, equivalent change and modification of the technical substance to the above embodiments all still belong to the technical solution scope of the present invention.
Claims (3)
1. A complete set of calibration equipment for a steam turbine differential expansion instrument is characterized by comprising a fixed base (1), wherein a transverse guide rail (2) is arranged on the fixed base (1), and a micrometer scale spiral pair (3) is also arranged on the bottom edge; a movable sleeve (4) is arranged on the transverse guide rail (2), a telescopic connecting rod (5) penetrates through the movable sleeve (4), one end of the telescopic connecting rod (5) is connected with the micrometer scale spiral pair (3), the other end of the telescopic connecting rod is connected with a mounting frame (6), and two differential expansion instrument probes (7) are arranged on the mounting frame (6); the side of the fixed base is also provided with a magnetic attraction locking switch (8).
2. The steam turbine differential expansion instrument set verification device according to claim 1, wherein the transverse guide rail (2) is a dovetail groove guide rail.
3. The steam turbine differential expansion instrument set verification device according to claim 1, wherein the shape angle of the mounting frame (6) is consistent with the slope surface angle of the steam turbine to be tested.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020335426.3U CN211855202U (en) | 2020-03-17 | 2020-03-17 | Complete set of calibration device for steam turbine differential expansion instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020335426.3U CN211855202U (en) | 2020-03-17 | 2020-03-17 | Complete set of calibration device for steam turbine differential expansion instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211855202U true CN211855202U (en) | 2020-11-03 |
Family
ID=73135228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020335426.3U Expired - Fee Related CN211855202U (en) | 2020-03-17 | 2020-03-17 | Complete set of calibration device for steam turbine differential expansion instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211855202U (en) |
-
2020
- 2020-03-17 CN CN202020335426.3U patent/CN211855202U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201103 |
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| CF01 | Termination of patent right due to non-payment of annual fee |