DE102006015817A1 - Leakage of e.g. hydrogen nitrogen mixture, detection method, involves absorbing hydrogen nitrogen mixture with environmental air, and continuously measuring concentration of hydrogen in absorbed gas mixture - Google Patents

Leakage of e.g. hydrogen nitrogen mixture, detection method, involves absorbing hydrogen nitrogen mixture with environmental air, and continuously measuring concentration of hydrogen in absorbed gas mixture Download PDF

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Publication number
DE102006015817A1
DE102006015817A1 DE200610015817 DE102006015817A DE102006015817A1 DE 102006015817 A1 DE102006015817 A1 DE 102006015817A1 DE 200610015817 DE200610015817 DE 200610015817 DE 102006015817 A DE102006015817 A DE 102006015817A DE 102006015817 A1 DE102006015817 A1 DE 102006015817A1
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Prior art keywords
hydrogen
mixture
nitrogen mixture
hydrogen nitrogen
leakage
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DE200610015817
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German (de)
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Peter Speemann
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Individual
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

The method involves absorbing hydrogen nitrogen mixture or hydrogen nitrogen air mixture, escaping from a test specimen in a leaky position, with a certain quantity of environmental air. Concentration of hydrogen in the absorbed gas mixture, with which a measuring probe is in permanent contact, is continuously measured.

Description

Anwendungsgebietfield of use

Die Erfindung betrifft ein Verfahren entsprechend dem Oberbegriff des Anspruchs IThe The invention relates to a method according to the preamble of Claim I

Stand der TechnikState of the art

  • Schnüffeltechniksniffing technology
  • Prüfung mit einem passiven Sensor.exam with a passive sensor.

  • Integralmessung, Partialmessung, InversmessungIntegral measurement, partial measurement, inverse measurement
  • Entnahme einer Probe aus dem Gasgemisch (Akkumulierend)Taking a sample from the gas mixture (Accumulating)

Nachteile des Standes der TechnikDisadvantages of the state of the technique

Die Schnüffelsonde, als passives Element, wird in das Gasgemisch gehalten und ermittelt nur die lokale und momentane Konzentration an Wasserstoff in unmittelbarer Nähe der Sonde (Sensor), nicht aber die gesamte Menge an Wasserstoff, die an der zu messenden/prüfenden Stelle austritt. Somit ist eine genaue Bestimmung der austretenden Wasserstoffmenge an der zu prüfenden Stelle nicht möglich.The Sniffer probe, as a passive element, is held in the gas mixture and determined only the local and instantaneous concentration of hydrogen in the immediate Near the Probe (sensor), but not the entire amount of hydrogen, the at the person to be measured / tested Job exit. Thus, an accurate determination of the exiting Amount of hydrogen at the test to be tested Place not possible.

Bei der Integralmessung wird der Prüfling bzw. die geschlossenen Prüfkammer mit Prüfgas gefüllt und der aus einer undichten Stelle entweichende Wasserstoff in der geschlossenen Prüfkammer bzw. in dem Prüfling aufgefangen. Nach einer bestimmten Zeit wird, wenn die Konzentration an Wasserstoff in der geschlossenen Prüfkammer bzw. dem Prüfling entsprechend hoch ist, aus der Prüfkammer bzw. des Prüflings eine Probe entnommen und die Konzentration des Wasserstoffes in der Probe bestimmt. Der Nachteil dieser Methode ist, dass eine Bestimmung der Konzentration sehr stark von der Zeit abhängt. Weiterhin spielt hier die Verteilung der Wasserstoffkonzentration in der Prüfkammer, die wiederum von der Geometrie des Prüflings bzw. der Prüfkammer abhängig, eine entscheidende Rolle. Es muss sichergestellt werden, dass die Konzentration in der Prüfkammer gleichmäßig ist. Ein weiterer Nachteil ist, dass sich die Konzentration in der Prüfkammer/Prüfling ständig verändert (ansteigt).at the integral measurement is the candidate or the closed test chamber with test gas filled and the leaking from a leak hydrogen in the closed test chamber or in the examinee collected. After a certain time, when the concentration corresponding to hydrogen in the closed test chamber or the test specimen is high, from the test chamber or the test object taken a sample and the concentration of hydrogen in the sample determined. The disadvantage of this method is that a determination of Concentration depends very much on the time. Continue to play here the distribution of the hydrogen concentration in the test chamber, which in turn depends on the geometry of the test piece or the test chamber, a decisive role. It must be ensured that the concentration in the test chamber is even. Another disadvantage is that the concentration in the test chamber / specimen constantly changes (increases).

Aufgabe der ErfindungTask of invention

Erzeugen eines Wasserstoff-Luftgemisches mit einer praktisch gleich bleibenden Konzentration. Erfassung und Einbeziehung in die Messung des fast gesamten austretenden Wasserstoffes. Erzeugung eines zeitunabhängigen und gleich bleibenden Messsignals.Produce a hydrogen-air mixture with a virtually constant Concentration. Capture and inclusion in the measurement of almost total leaking hydrogen. Generation of a time independent and constant measuring signal.

Reproduzierbare Ermittlung von sehr kleinen Undichtheiten in für den Anwender ausreichend kurzen Zeiten.reproducible Determination of very small leaks in sufficient for the user short times.

Problemlose Anwendung in getakteten Produktionslinien.trouble Application in timed production lines.

Das Verfahren eignet sich für die Einhaltung der immer schärfer werdenden Umweltschutzvorschriften.The Method is suitable for compliance with the ever sharper becoming environmental protection regulations.

Lösung der AufgabeSolution of task

Das aus einem Prüfling an einer undichten Stelle austretende Wasserstoff-Stickstoff-Gemisch oder Wasserstoff-Stickstoff-Luft-Gemisch wird mit einer bestimmten Menge (Umgebungs-)luft angesaugt und die Konzentration des Wasserstoffes in dem erzeugten (angesaugten) Gasgemisch-Luftstrom, mit dem die (Mess)-Sonde ständigen Kontakt hat, laufend bestimmt (gemessen).The from a test object leaking hydrogen-nitrogen mixture or Hydrogen-nitrogen-air mixture comes with a certain amount (Ambient) air sucked in and the concentration of hydrogen in the generated (aspirated) gas mixture air stream with which the (Measuring) probe Contact has definite, ongoing (measured).

Ausführungsbeispielembodiment

Prüfung von kleinen Undichtheiten an Kraftstoffsystemen von Verbrennungsmotoren am Einzelteil sowie am teilweise oder komplett montierten Motor.Examination of small leaks in fuel systems of internal combustion engines on the item as well as on partially or completely assembled engine.

Claims (1)

Ein Verfahren zur Ermittlung/Erfassung von Undichtheiten an Prüflingen, das dadurch gekennzeichnet ist, dass das aus einem Prüfling an einer undichten Stelle austretende Wasserstoff-Stickstoff-Gemisch oder Wasserstoff-Stickstoff-Luft-Gemisch mit einer bestimmten Menge (Umgebungs-)luft angesaugt und die Konzentration des Wasserstoffes in dem erzeugten (angesaugten) Gasgemisch-Luftstrom, mit dem die (Mess)-Sonde ständigen Kontakt hat, laufend bestimmt (gemessen) wird.A method for detecting / detecting leaks in specimens, which is characterized in that the leaking from a test specimen at a leak hydrogen-nitrogen mixture or hydrogen-nitrogen-air mixture with a certain amount of (ambient) air sucked and the concentration of hydrogen in the generated (aspirated) gas mixture air flow, with which the (measuring) probe is in constant contact, is continuously determined (measured).
DE200610015817 2006-04-03 2006-04-03 Leakage of e.g. hydrogen nitrogen mixture, detection method, involves absorbing hydrogen nitrogen mixture with environmental air, and continuously measuring concentration of hydrogen in absorbed gas mixture Withdrawn DE102006015817A1 (en)

Priority Applications (1)

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DE200610015817 DE102006015817A1 (en) 2006-04-03 2006-04-03 Leakage of e.g. hydrogen nitrogen mixture, detection method, involves absorbing hydrogen nitrogen mixture with environmental air, and continuously measuring concentration of hydrogen in absorbed gas mixture

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DE200610015817 DE102006015817A1 (en) 2006-04-03 2006-04-03 Leakage of e.g. hydrogen nitrogen mixture, detection method, involves absorbing hydrogen nitrogen mixture with environmental air, and continuously measuring concentration of hydrogen in absorbed gas mixture

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110095237A (en) * 2019-05-24 2019-08-06 百尔制冷(无锡)有限公司 A kind of leak hunting method of refrigeration system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3837228A (en) * 1973-04-09 1974-09-24 Vacuum Inst Corp Tracer gas-permeable probe for leak detectors
DE10304996A1 (en) * 2002-02-25 2003-09-04 Luk Automobiltech Gmbh & Co Kg Seal testing of pumps or pressurized containers for liquids or gases, e.g. diesel circulation pumps, whereby a cover is applied to the test piece and test gas supplied to it, with sensors connected to the cover to detect test gas
WO2006032591A1 (en) * 2004-09-22 2006-03-30 Inficon Gmbh Leak testing method and leak testing device comprising a partial pressure sensor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3837228A (en) * 1973-04-09 1974-09-24 Vacuum Inst Corp Tracer gas-permeable probe for leak detectors
DE10304996A1 (en) * 2002-02-25 2003-09-04 Luk Automobiltech Gmbh & Co Kg Seal testing of pumps or pressurized containers for liquids or gases, e.g. diesel circulation pumps, whereby a cover is applied to the test piece and test gas supplied to it, with sensors connected to the cover to detect test gas
WO2006032591A1 (en) * 2004-09-22 2006-03-30 Inficon Gmbh Leak testing method and leak testing device comprising a partial pressure sensor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110095237A (en) * 2019-05-24 2019-08-06 百尔制冷(无锡)有限公司 A kind of leak hunting method of refrigeration system
CN110095237B (en) * 2019-05-24 2020-10-23 百尔制冷(无锡)有限公司 Leakage detection method of refrigerating system

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