CN104897038A - Steam turbine differential expansion measuring instrument - Google Patents
Steam turbine differential expansion measuring instrument Download PDFInfo
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- CN104897038A CN104897038A CN201410077406.XA CN201410077406A CN104897038A CN 104897038 A CN104897038 A CN 104897038A CN 201410077406 A CN201410077406 A CN 201410077406A CN 104897038 A CN104897038 A CN 104897038A
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- steam turbine
- sensor
- instrument
- differential expansion
- lvdt
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Abstract
The invention belongs to measurement technical field and specifically relates to a steam turbine differential expansion measuring instrument. The steam turbine differential expansion measuring instrument is improved in precision of differential expansion measurement, temperature drift characteristic, and adaptive capacity to environment in order to satisfy a requirement of long-term reloading, shorten inline time of the instrument control steam turbine, ensure accurate and reliable measurement of steam turbine displacement instruments, and guarantee stable operation of a unit. The steam turbine differential expansion measuring instrument comprises a protective housing (1), a LVDT sensor (2), an [omega]-shaped magnet (3), a wear-resistant head (4), an eddy current compensating sensor (5), a linear bearing (6), a pull bar (7), a linear socket (8), an instrument rod (9), an steam turbine cam (10), a fixing screw (11), an installing support (12), a compensating sensor prepositioned device (13), and a LVDT sensor prepositioned device (14).
Description
Technical field
The invention belongs to field of measuring technique, be specifically related to a kind of steam turbine differential expansion measurement instrument.
Background technology
The general every platform steam turbine of nuclear power station has 4 pieces of low pressure (LP) cylinder swollen difference measurements instrument, 1 piece of swollen measurement instrument of axle, 2 pieces of swollen measurement instruments of cylinder.According to the plan of maintenance program and the importance of instrument, each overhaul of steam turbine differential expansion measurement instrument is all carried out verification and is demarcated.
The existing swollen poor instrument of nuclear power station is differential electromagnetic formula measuring principle, its range is large, low 2.5% error precision of precision, and the bad rising indicating value along with temperature of temperature drift characteristic reduces, instrument check takies conventional island main line time measuring accuracy that is long, instrument affects larger by assemblage gap.Because Russia supplies the measurement cam of swollen poor instrument to be arranged on low cylinder side bearing case outer end, low cylinder shaft-packing leakage causes instrument surface temperature to reach about 100 DEG C, and exist in measurement environment in oil smoke bearing housing to emerge to be accumulated in instrument and form greasy filth, under this particular surroundings, domestic and international market being difficult to search out with former Russia for instrument range maximum range is that swollen poor instrument that 50mm matches is for substituting.
Summary of the invention
Technical matters to be solved by this invention is, not enough for prior art, there is provided a kind of precision of swollen difference measurements, the temperature drift characteristic improving instrument, reinforcement instrument of improving to the adaptive faculty of environment, to meeting the requirement that long period reloads, realize shortening the instrument control steam turbine main line time, guarantee that the measurement of steam turbine displacement instrument accurately, reliably, ensures a kind of steam turbine differential expansion measurement instrument of stable operation of unit.
The technical solution adopted in the present invention is:
A kind of steam turbine differential expansion measurement instrument, comprise protecting sheathing, LVDT sensor, Ω shape magnet, wear-resisting head, current vortex compensation sensor, linear bearing, pull bar, straight line socket, instrument bar, steam turbine cam, gib screw, mounting bracket, compensation sensor fore-lying device and LVDT leading sensor device, wherein said protecting sheathing is hollow rectangular parallelepiped, protecting sheathing side is provided with straight line socket, straight line socket is provided with LVDT sensor, LVDT sensor one end is provided with instrument bar, connect " L " shape pull bar with mark post one end, the pull bar other end is connected with Ω shape magnet; Described protective housing is provided with linear bearing, and Ω shape magnet is located on linear bearing, and Ω shape magnet is provided with wear-resisting head and current vortex compensation sensor; Described mounting bracket is " L " shape support, is arranged on protecting sheathing lower end by screw; Described compensation sensor fore-lying device is connected with current vortex compensation sensor by cable, and described LVDT leading sensor device is connected with straight line socket.
The invention has the beneficial effects as follows:
1. improve meter performance, accuracy of instrument brings up to 1.25% by former Russia for instrument 2.5%.Effectively reduce the impact of temperature variation on measuring error;
2. optimize metering system, the change in location of steam turbine flange affects instrument bar to move in monitoring coil by magnet, the dead band produced by friction force is compensated by eddy current probe, wear-resisting head and cam clearance are 1.2mm, secure the dead zone range that friction force produces, successfully eliminate instrument assemblage gap, blind area to the impact of measuring error;
3. " Ω shape magnet+linear bearing+eddy current probe compensation+high-precision sensor+antifriction head " integral type measurement mechanism, domesticly uses first, realizes wide range, the high-acruracy survey to steam turbine differential expansion under bad working environments in a non-contact manner.
Accompanying drawing explanation
Fig. 1 is steam turbine differential expansion measurement instrument schematic diagram;
Fig. 2 is steam turbine differential expansion measurement instrument vertical view.
In figure: 1-protecting sheathing; 2-LVDT sensor; 3-Ω shape magnet; 4-wear-resisting head; 5-current vortex compensation sensor; 6-linear bearing; 7-pull bar; 8-connector socket; 9-instrument bar; 10-steam turbine cam; 11-gib screw; 12-mounting bracket; 13-compensation sensor fore-lying device; 14-LVDT leading sensor device.
Embodiment
Below in conjunction with drawings and Examples, one provided by the invention is introduced:
A kind of steam turbine differential expansion measurement instrument, comprise protecting sheathing 1, LVDT sensor 2, Ω shape magnet 3, wear-resisting head 4, current vortex compensation sensor 5, linear bearing 6, pull bar 7, straight line socket 8, instrument bar 9, steam turbine cam 10, gib screw 11, mounting bracket 12, compensation sensor fore-lying device 13 and LVDT leading sensor device 14, wherein said protecting sheathing 1 is hollow rectangular parallelepiped, protecting sheathing 1 side is provided with straight line socket 8, straight line socket 8 is provided with LVDT sensor 2, LVDT sensor 2 one end is provided with instrument bar 9, " L " shape pull bar 7 is connected with mark post 9 one end, pull bar 7 other end is connected with Ω shape magnet 3, described protective housing 1 is provided with linear bearing 6, Ω shape magnet 3 and is located on linear bearing 6, and Ω shape magnet is provided with wear-resisting head 4 and current vortex compensation sensor 5, described mounting bracket 12 is " L " shape support, is arranged on protecting sheathing 1 lower end by screw 11, described compensation sensor fore-lying device 13 is connected with current vortex compensation sensor 5 by cable, and described LVDT leading sensor device 14 is connected with straight line socket 8.
Steam turbine cam is for measuring steam turbine differential expansion.Current vortex compensation sensor measures the distance (range 0 ~ 4mm) of cam and probe, and revises LVDT measured value.Instrument protection shell protection LVDT reduces outside rugged surroundings to instrumental effects, and as the support of LVDT, linear bearing and pull bar.Instrument is installed to site of deployment by mounting bracket.Measuring-signal is guided to fore-lying device by connection plug.Ω shape magnet and steam turbine cam produce magnetic force, change with cam position change.Wear-resisting head control survey dead band, prevents displacement transfer device blind area from becoming large, control gap 1.2mm.Linear bearing improves displacement sensitivity, and guarantees that Ω shape magnet can only along same rectilinear movement.Compensation sensor fore-lying device gathers current vortex compensation sensor measuring-signal, and is converted into 4 ~ 20mA current signal.Pull bar, by the displacement of Ω shape magnet, passes to instrument bar.LVDT leading sensor device: gather LVDT measuring-signal, and be converted into 4 ~ 20mA current signal.
Claims (1)
1. a steam turbine differential expansion measurement instrument, it is characterized in that: comprise protecting sheathing (1), LVDT sensor (2), Ω shape magnet (3), wear-resisting head (4), current vortex compensation sensor (5), linear bearing (6), pull bar (7), straight line socket (8), instrument bar (9), steam turbine cam (10), gib screw (11), mounting bracket (12), compensation sensor fore-lying device (13) and LVDT leading sensor device (14), wherein said protecting sheathing (1) is hollow rectangular parallelepiped, protecting sheathing (1) side is provided with straight line socket (8), straight line socket (8) is provided with LVDT sensor (2), LVDT sensor (2) one end is provided with instrument bar (9), " L " shape pull bar (7) is connected with mark post (9) one end, pull bar (7) other end is connected with Ω shape magnet (3), described protective housing (1) is provided with linear bearing (6), and Ω shape magnet (3) is located on linear bearing (6), and Ω shape magnet is provided with wear-resisting head (4) and current vortex compensation sensor (5), described mounting bracket (12) is " L " shape support, is arranged on protecting sheathing (1) lower end by screw (11), described compensation sensor fore-lying device (13) is connected with current vortex compensation sensor (5) by cable, and described LVDT leading sensor device (14) is connected with straight line socket (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410077406.XA CN104897038B (en) | 2014-03-04 | 2014-03-04 | A kind of steam turbine differential expansion measuring instrumentss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410077406.XA CN104897038B (en) | 2014-03-04 | 2014-03-04 | A kind of steam turbine differential expansion measuring instrumentss |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104897038A true CN104897038A (en) | 2015-09-09 |
| CN104897038B CN104897038B (en) | 2017-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410077406.XA Active CN104897038B (en) | 2014-03-04 | 2014-03-04 | A kind of steam turbine differential expansion measuring instrumentss |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106052538A (en) * | 2016-06-23 | 2016-10-26 | 国家电网公司 | On-line state diagnosis device and method for water turbine unit shafting power system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61116007A (en) * | 1984-11-12 | 1986-06-03 | Toshiba Corp | Differential expansion monitor in turbine |
| CN201589683U (en) * | 2009-12-14 | 2010-09-22 | 贵州电力试验研究院 | Differential expansion monitoring device of turbine lower-pressure cylinder |
| DE102012109714A1 (en) * | 2011-10-12 | 2013-05-08 | General Electric Company | Internal / external shell differential strain measurement |
| CN203177799U (en) * | 2013-04-08 | 2013-09-04 | 成都赛腾自动化工程有限公司 | Differential expansion monitoring device of air cylinder and rotor of steam turbine |
| CN203798307U (en) * | 2014-03-04 | 2014-08-27 | 江苏核电有限公司 | Steam turbine expanding difference measuring instrument |
-
2014
- 2014-03-04 CN CN201410077406.XA patent/CN104897038B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61116007A (en) * | 1984-11-12 | 1986-06-03 | Toshiba Corp | Differential expansion monitor in turbine |
| CN201589683U (en) * | 2009-12-14 | 2010-09-22 | 贵州电力试验研究院 | Differential expansion monitoring device of turbine lower-pressure cylinder |
| DE102012109714A1 (en) * | 2011-10-12 | 2013-05-08 | General Electric Company | Internal / external shell differential strain measurement |
| CN203177799U (en) * | 2013-04-08 | 2013-09-04 | 成都赛腾自动化工程有限公司 | Differential expansion monitoring device of air cylinder and rotor of steam turbine |
| CN203798307U (en) * | 2014-03-04 | 2014-08-27 | 江苏核电有限公司 | Steam turbine expanding difference measuring instrument |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106052538A (en) * | 2016-06-23 | 2016-10-26 | 国家电网公司 | On-line state diagnosis device and method for water turbine unit shafting power system |
| CN106052538B (en) * | 2016-06-23 | 2018-08-03 | 国家电网公司 | A kind of water turbine set shafting dynamical system state on-line diagnosing apparatus and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104897038B (en) | 2017-12-22 |
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