DE1249290B - Device for checking the blades of a turbine runner for completeness - Google Patents
Device for checking the blades of a turbine runner for completenessInfo
- Publication number
- DE1249290B DE1249290B DE1956R0020157 DER0020157A DE1249290B DE 1249290 B DE1249290 B DE 1249290B DE 1956R0020157 DE1956R0020157 DE 1956R0020157 DE R0020157 A DER0020157 A DE R0020157A DE 1249290 B DE1249290 B DE 1249290B
- Authority
- DE
- Germany
- Prior art keywords
- blades
- completeness
- blade ring
- plates
- electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/04—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for responsive to undesired position of rotor relative to stator or to breaking-off of a part of the rotor, e.g. indicating such position
Description
DEUTSCHESGERMAN
PATENTAMTPATENT OFFICE
Int. Cl.: Int. Cl .:
FOIdFOId
Deutsche Kl.: 14 c-8/06German class: 14 c-8/06
Nummer: 1 249 290Number: 1 249 290
Aktenzeichen: R 201571 a/14 cFile number: R 201571 a / 14 c
Anmeldetag: 8. Dezember 1956Filing date: December 8, 1956
Auslegetag: 7. September 1967Opened on: September 7, 1967
Die Erfindung betrifft eine Einrichtung, um die Schaufeln und, falls vorhanden, die Deckbandsegmente eines Schaufelkranzes eines Turbinenläufers während des Betriebes auf Vollzähligkeit zu. prüfen.The invention relates to a device around the blades and, if present, the shroud segments of a blade ring of a turbine rotor during operation towards completeness. check.
Bisher ist das einzige Mittel, eine Turbine im Betrieb auf etwaige Schaufelbrüche zu überwachen, die Beobachtung der Laufruhe, d. h. Abfühlen und eventuelles Messen der Gehäuseschwingungen, besonders der Lagergehäuseschwingungen. Da aber etwaige Unruhe auch andere Ursachen, z. B. Krümmung des Läufers, haben kann, so zeigt der Laufzustand nicht eindeutig an, ob und wie viele und gegebenenfalls wo, d. h. in welchem Schaufelkranz und an welcher Stelle des Kranzes, Schaufeln fehlen. Eine Vorrichtung, die dies klar anzeigt, ist das Ziel der Erfindung.So far, the only way to monitor a turbine for possible blade fractures is during operation Observation of the running smoothness, d. H. Sensing and possibly measuring the housing vibrations, especially the bearing housing vibrations. But since any unrest also has other causes, e.g. B. Curvature of the runner, the running status does not clearly indicate whether and how many and where appropriate, d. H. in which blade ring and at which point of the ring are missing blades. A device that clearly indicates this is the aim of the invention.
Die Erfindung benutzt dazu eine an sich bekannte elektrisch-kapazitive Meßeinrichtung, welche mittels einer Elektrode, die im Turbinengehäuse dicht radial neben dem Schaufelkranz isoliert angeordnet ist und unter Spannung steht, beim Vorbeigehen jeder Schaufel bzw. jedes Deckbandsegmentes infolge der Modulation des Spannungsfeldes ein Meßsignal erzeugt. Solche Einrichtungen dienen zur Überwachung des Radialspaltes; sie sollen dort nur die von der längsten Schaufel des Kranzes ausgehenden Impulse erfassen, was durch einen angeschlossenen Spitzenspannungsmesser erreicht wird, der die einzelnen Schaufeln bei der vorgesehenen Betriebsweise nicht anzeigt.The invention uses an electrically-capacitive measuring device known per se, which by means of an electrode, which is arranged in the turbine housing tightly and radially insulated next to the blade ring and is under tension when passing each blade or each shroud segment as a result of the Modulation of the voltage field generates a measurement signal. Such devices are used for monitoring the radial gap; there they should only receive the impulses emanating from the longest shovel of the wreath record what is achieved by a connected peak voltmeter, which the individual Does not show blades in the intended mode of operation.
Die Erfindung benutzt deshalb ferner einen Kathodenstrahl-Oszillographen, dessen einem Plattenpaar die Meßsignale und dessen anderem Plattenpaar eine sägezahnförmig und mit der Läuferdrehung synchron sich ändernde Spannung zugeführt werden.The invention therefore also uses a cathode ray oscilloscope, one of which is a pair of plates the measuring signals and its other pair of plates a sawtooth shape and with the rotor rotation synchronously changing voltage are supplied.
Die Zeichnung zeigt inThe drawing shows in
F i g. 1 eine Turbine mit einer Meßelektrode und der zur Umwandlung der Feldstärkeänderung in elektrische Impulse dienenden Schaltung, F i g. 2 die Meßelektrode,F i g. 1 a turbine with a measuring electrode and the conversion of the field strength change in circuit used for electrical impulses, FIG. 2 the measuring electrode,
F i g. 3 das vom Oszillographen gelieferte Bild bei Fehlen einer Schaufel.F i g. 3 the image provided by the oscilloscope in the absence of a shovel.
Darin bedeuten 1 die Meßelektrode, 2 das Turbinengehäuse, 3 einen Laufschaufelkranz, 4 eine
Gleichspannungsquelle, 5 einen hochohmigen Widerstand, 6 einen Meßkondensator, 8 den plattenförmig
endenden Leiter und 9 den Isolator der Elektrode, 10 eine zweiteilige Schraubbuchse, mittels derer die
Elektrode im Turbinengehäuse befestigt wird, und 12 die Anschlußklemmen für die Leitungen zum
Einrichtung zur Prüfung der Schaufeln eines
Turbinenläufers auf Vollzähligkeit1 denotes the measuring electrode, 2 the turbine housing, 3 a rotor blade ring, 4 a DC voltage source, 5 a high-ohmic resistor, 6 a measuring capacitor, 8 the plate-shaped conductor and 9 the electrode insulator, 10 a two-part screw socket, by means of which the electrode in the turbine housing is attached, and 12 the terminals for the lines for the device for testing the blades of a
Turbine rotor for completeness
Anmelder:Applicant:
Dr. Reutlinger & Söhne
Institut für Schwingungstechnik,
Darmstadt, Riedstr. 6Dr. Reutlinger & Sons
Institute for Vibration Technology,
Darmstadt, Riedstr. 6th
Als Erfinder benannt:
Wolf-Dieter Reutlinger, DarmstadtNamed as inventor:
Wolf-Dieter Reutlinger, Darmstadt
Oszillographen. Ie nachdem, ob sich vor der Elektrode eine Schaufel befindet oder nicht, ändert sich die Feldstärke und somit die Spannung an der Elektrode. Eine durch Schaufelbruch verursachte Lücke des Schaufelkranzes erscheint im Oszillogramm gleichfalls als Lücke, nämlich als dunkle Stelle im sonst hellen Band. Und aus der Lage dieser Stelle im Oszillogramm läßt sich auch diejenige Stelle des Schaufelkranzumfangs, an der die Schaufel bzw. das Deckbandsegment herausgebrochen ist, lokalisieren; hierzu ist die Abszisse des Oszillogramms von O bis 360° unterteilt.Oscilloscope. Depending on whether there is a shovel in front of the electrode or not, it changes the field strength and thus the voltage at the electrode. A gap caused by a broken blade of the blade ring also appears in the oscillogram as a gap, namely as a dark point in the otherwise bright band. And from the position of this point in the oscillogram, the point of the Locate the circumference of the blade ring at which the blade or the shroud segment has broken out; for this purpose, the abscissa of the oscillogram is subdivided from 0 to 360 °.
Mittels der zur gleichzeitigen Anzeige mehrerer Vorgänge auf einem Bildschirm bekannten Elektronenschalter lassen sich im Oszillogramm zwei und mehr Schaufelkränze gleichzeitig überwachen.By means of the electron switches known for the simultaneous display of several processes on a screen two or more blade rings can be monitored simultaneously in the oscillogram.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1956R0020157 DE1249290B (en) | 1956-12-08 | 1956-12-08 | Device for checking the blades of a turbine runner for completeness |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1956R0020157 DE1249290B (en) | 1956-12-08 | 1956-12-08 | Device for checking the blades of a turbine runner for completeness |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1249290B true DE1249290B (en) | 1967-09-07 |
Family
ID=603434
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1956R0020157 Pending DE1249290B (en) | 1956-12-08 | 1956-12-08 | Device for checking the blades of a turbine runner for completeness |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1249290B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4644261A (en) * | 1985-02-28 | 1987-02-17 | Carter Donald L | Method of determining cylindricity and squareness |
US4806848A (en) * | 1987-03-11 | 1989-02-21 | The United States Of America As Represented By The Secretary Of The Air Force | Compressor blade clearance measurement system |
-
1956
- 1956-12-08 DE DE1956R0020157 patent/DE1249290B/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4644261A (en) * | 1985-02-28 | 1987-02-17 | Carter Donald L | Method of determining cylindricity and squareness |
US4806848A (en) * | 1987-03-11 | 1989-02-21 | The United States Of America As Represented By The Secretary Of The Air Force | Compressor blade clearance measurement system |
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