DE102010027233A1 - Method for detecting cavitations in control edge of e.g. valve, involves detecting cavitations in cavitation-endangered region by sensor e.g. photodiode, where illumination of hydraulic fluid is detected by sensor - Google Patents
Method for detecting cavitations in control edge of e.g. valve, involves detecting cavitations in cavitation-endangered region by sensor e.g. photodiode, where illumination of hydraulic fluid is detected by sensor Download PDFInfo
- Publication number
- DE102010027233A1 DE102010027233A1 DE201010027233 DE102010027233A DE102010027233A1 DE 102010027233 A1 DE102010027233 A1 DE 102010027233A1 DE 201010027233 DE201010027233 DE 201010027233 DE 102010027233 A DE102010027233 A DE 102010027233A DE 102010027233 A1 DE102010027233 A1 DE 102010027233A1
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- DE
- Germany
- Prior art keywords
- sensor
- cavitations
- cavitation
- detecting
- illumination
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- 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.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/70—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light mechanically excited, e.g. triboluminescence
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Erfassung von Kavitation und ein hydraulisches Vorrichtung, zum Beispiel ein Ventil oder eine Pumpe, bei dem eine Auftretende Kavitation erfasst wird.The invention relates to a method for detecting cavitation and a hydraulic device, for example a valve or a pump, in which an occurring cavitation is detected.
Kavitation ist die Bildung und Auflösung von Hohlräumen in einer Flüssigkeit durch Schwankungen des statischen Drucks. In hydraulischen Geräten tritt Kavitation insbesondere an Stellen mit hoher Strömungsgeschwindigkeit der hydraulischen Flüssigkeit, insbesondere an Steuerkanten auf, mit denen Durchflussquerschnitte verändert werden. Dies kann dies zu Beschädigungen durch sogenannte Kavitationserosion führen. Deshalb ist es wünschenswart, frühzeitig beginnende Kavitation zu erkennen um dann Gegenmaßnahmen ergreifen und Schäden vermeiden zu können.Cavitation is the formation and dissolution of cavities in a liquid due to variations in static pressure. In hydraulic devices, cavitation occurs, in particular, at points where the hydraulic fluid has a high flow velocity, in particular at control edges, with which flow cross sections are changed. This can lead to damage caused by so-called cavitation erosion. Therefore, it is desirable to be able to detect early onset of cavitation in order to take countermeasures and avoid damage.
Aus der
Der Erfindung liegt die Aufgabe zugrunde, Kavitation insbesondere in hydraulischen Anlagen frühzeitig zu erkennen und dafür einen sehr preisgünstigen Sensor bereitzustellen.The invention has for its object to detect cavitation early in particular in hydraulic systems and to provide a very inexpensive sensor.
Diese Aufgabe wird durch ein Verfahren gelöst, bei dem zur Erfassung von Kavitation ein lichtempfindlicher Sensor verwendet wird.This object is achieved by a method in which a photosensitive sensor is used to detect cavitation.
Der lichtempfindliche Sensor ist bevorzugt eine einfache Fotodiode.The photosensitive sensor is preferably a simple photodiode.
Die Aufgabe wird auch durch eine hydraulische Vorrichtung, insbesondere ein Ventil oder eine Pumpe gelöst, bei der stromab eines und nahe an einem kavitationsgefährdeten Bereich ein lichtempfindlicher Sensor, insbesondere eine Fotodiode angeordnet ist.The object is also achieved by a hydraulic device, in particular a valve or a pump, in which a light-sensitive sensor, in particular a photodiode, is arranged downstream of and near a cavitation-prone area.
Bei Untersuchungen zur Geräuschentwicklung von Hydraulikventilen ist bei Auftreten von stärkerer Kavitation ein Leuchten des Öles aufgefallen. Dieses Phänomen ist bekannt, wenn auch nicht abschließend geklärt. Man kann jedoch davon ausgehen, dass das Leuchten des Öls immer mit starker Kavitation einhergeht. Kern der Erfindung ist es nun, dass das Leuchten und somit starke Kavitation mit einem lichtempfindlichen Sensor erfasst wird. Der lichtempfindliche Sensor kann eine einfache Fotodiode sein. Diese ist in der Nähe einer Drosselstelle mit hoher Strömungsgeschwindigkeit der hydraulischen Flüssigkeit bzw. dem zu vermutenden Ort der Kavitation in der ablaufenden Strömung, also stromab des kavitationsgefährdeten Bereichs so angebracht, dass sie das Licht auf sie fällt. Sie kann sich dabei durchaus in oder am Rande des Flusses befinden, so dass sie von der Flüssigkeit benetzt wird. Denkbar ist jedoch auch eine Anordnung hinter Glas.In investigations into the noise development of hydraulic valves, a flash of oil has been noticed when severe cavitation occurs. This phenomenon is known, although not conclusively clarified. However, it can be assumed that the glow of the oil is always associated with strong cavitation. The core of the invention is now that the illumination and thus strong cavitation with a photosensitive sensor is detected. The photosensitive sensor may be a simple photodiode. This is in the vicinity of a throttle point with high flow velocity of the hydraulic fluid or the presumed location of cavitation in the outflowing flow, ie downstream of the cavitation-prone area mounted so that it falls on them. It may well be in or at the edge of the river, so that it is wetted by the liquid. However, an arrangement behind glass is also conceivable.
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 19634816 A1 [0003] DE 19634816 A1 [0003]
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010027233 DE102010027233A1 (en) | 2010-07-15 | 2010-07-15 | Method for detecting cavitations in control edge of e.g. valve, involves detecting cavitations in cavitation-endangered region by sensor e.g. photodiode, where illumination of hydraulic fluid is detected by sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010027233 DE102010027233A1 (en) | 2010-07-15 | 2010-07-15 | Method for detecting cavitations in control edge of e.g. valve, involves detecting cavitations in cavitation-endangered region by sensor e.g. photodiode, where illumination of hydraulic fluid is detected by sensor |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102010027233A1 true DE102010027233A1 (en) | 2012-01-19 |
Family
ID=45402811
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE201010027233 Withdrawn DE102010027233A1 (en) | 2010-07-15 | 2010-07-15 | Method for detecting cavitations in control edge of e.g. valve, involves detecting cavitations in cavitation-endangered region by sensor e.g. photodiode, where illumination of hydraulic fluid is detected by sensor |
Country Status (1)
Country | Link |
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DE (1) | DE102010027233A1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19634816A1 (en) | 1995-08-31 | 1997-03-06 | Caterpillar Inc | Capacitive multipurpose sensor, esp. for detecting several parameters of hydraulic system |
-
2010
- 2010-07-15 DE DE201010027233 patent/DE102010027233A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19634816A1 (en) | 1995-08-31 | 1997-03-06 | Caterpillar Inc | Capacitive multipurpose sensor, esp. for detecting several parameters of hydraulic system |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
R005 | Application deemed withdrawn due to failure to request examination |