EP1756540A1 - Detecteur de fuites a sonde renifleuse - Google Patents

Detecteur de fuites a sonde renifleuse

Info

Publication number
EP1756540A1
EP1756540A1 EP05715976A EP05715976A EP1756540A1 EP 1756540 A1 EP1756540 A1 EP 1756540A1 EP 05715976 A EP05715976 A EP 05715976A EP 05715976 A EP05715976 A EP 05715976A EP 1756540 A1 EP1756540 A1 EP 1756540A1
Authority
EP
European Patent Office
Prior art keywords
sniffer
section
leak detector
hose
cross
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.)
Withdrawn
Application number
EP05715976A
Other languages
German (de)
English (en)
Inventor
Daniel Wetzig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Inficon GmbH Deutschland
Original Assignee
Inficon GmbH Deutschland
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Inficon GmbH Deutschland filed Critical Inficon GmbH Deutschland
Publication of EP1756540A1 publication Critical patent/EP1756540A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G01M3/202—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 using mass spectrometer detection systems
    • G01M3/205—Accessories or associated equipment; Pump constructions

Definitions

  • the invention relates to a leak detector with a sniffer probe, which is connected to a vacuum chamber via a sniffer tube designed as a throttling capillary line.
  • DE-OS 24 41 124 describes a leak detection device with a sniffer hose, in which the hose has a relatively large diameter.
  • a throttling point is provided directly in front of the mass spectrometer between a vacuum chamber and a mass spectrometer. Because the throttling point is arranged directly in front of the mass spectrometer, the gas to be examined can be conveyed faster with the aid of the vacuum pump from the inlet of the probe to directly in front of the throttling point, that is to the mass spectrometer. This reduces the response time, which depends on the length of the probe tube.
  • the pneumatic resistance is distributed over the entire length of the sniffer hose.
  • the pressure in the capillary decreases linearly from the inlet opening in a good approximation to the value at the outlet opening.
  • the dead time can be calculated from the quotient gas quantity (volume x average pressure) by flow. The contribution in the areas of the capillary with high pressure contributes more to the dead time than the areas with low pressure.
  • the invention has for its object to provide a leak detector with a capillary sniffer hose, which has short dead times and thus short response times.
  • the leak detector according to the present invention is defined by claim 1.
  • the sniffer hose has an inner cross-sectional area which varies in the longitudinal direction, the cross-sectional area increasing in the direction of flow of the sucked-in gas.
  • the invention provides that the greatest flow resistance of the sniffer hose is in the vicinity of the inlet opening. As a result, there is a sharp drop in pressure in the vicinity of the inlet opening. However, it must it should be noted that the flow does not become blocked and the laminar flow in the capillary does not become turbulent. These conditions can be achieved with a capillary with an increasing cross section in the flow direction.
  • the flow cross-section of the capillaries can have any course.
  • a capillary with a continuously increasing cross-section requires a higher manufacturing effort than a capillary with a step-wise enlarged cross-section.
  • a stepped capillary is therefore preferable. This also causes a significant reduction in dead time.
  • the choice of length and cross sections of the sections can be optimized. The optimization problem is influenced by the pressure at the inlet opening and at the outlet and depends on the desired total length of the line.
  • the diameter of the narrowest cross section of the sniffer hose is not greater than 700 ⁇ m. This ensures a sufficiently short dead time for this line section.
  • each section allows at least approximately the same flow to pass, the flow q pV resulting as follows:
  • the sniffer hose should let a large flow (gas volume per unit of time) pass through and have a short dead time (running time of the molecules from the inlet to the outlet).
  • FIG. 1 shows a schematic illustration of the leak detector
  • Figure 2 is a schematic representation of the cross-sectional changes of the sniffer hose
  • Figure 3 shows the pressure curve over the hose length.
  • FIG. 1 shows a leak detector which has a sniffing probe 10, which is designed, for example, like a pistol and has an inlet opening at the inlet end 11.
  • the sniffer probe 10 is connected to a sniffer hose 12, which is designed as a throttling capillary line.
  • the capillary leads to the inlet end 11 of the gun.
  • the outlet end of the sniffer hose 12 is connected to a vacuum chamber 13, which is evacuated by a high vacuum pump 14.
  • the vacuum chamber 13 is connected to a mass spectrometer 15, with which the sample gas to be detected, for example helium, is determined. Atmospheric pressure prevails at the inlet 11 of the sniffer probe 10.
  • the effect of the vacuum chamber 13 reduces the pressure in the course of the sniffer hose to, for example, 60 mbar.
  • FIG. 2 shows the cross-sectional profile of the inner cross-section of the sniffer hose over the hose length.
  • the representation is not to scale.
  • the sniffer hose is divided into individual sections 12a, 12b and 12c.
  • the first section 12a facing the inlet has a small cross section
  • the next section 12b has a larger cross section
  • the third section 12c has an even larger cross section. In this way, the greatest pressure drop occurs at section 12a.
  • the flow q pV and the dead time ⁇ tot of a capillary can be calculated as follows. It is assumed that the flow is laminar: q pV (l) ⁇ Hagen - Poiseuille - formula)
  • p x and p 2 are the pressures at the ends of the capillary, d is the diameter, I the length of the capillary and ⁇ is the dynamic viscosity of the gas in question, usually air.
  • the 5 m long line is composed of, for example, three sections with the following dimensions:
  • the dead time can be reduced by at least 30% by using three assembled sections.
  • FIG. 3 shows the course of the pressure P over the length I of the hose. This can be seen in the first hose section 12a, in which the greatest pressure drop occurs, while the pressure drop is lower in the subsequent hose sections.

Abstract

L'invention concerne un détecteur de fuites à sonde renifleuse. Selon l'invention, il est prévu que le flexible renifleur (12) se présentant sous forme de conduite capillaire à étranglement, qui mène de la sonde renifleuse (10) à une chambre à vide (13), présente une surface intérieure de section transversale variant dans le sens longitudinal. La surface de section transversale augmente dans le sens d'écoulement du gaz aspiré, c.-à-d. de l'admission (11) à la chambre à vide, ce qui réduit le temps mort, c.-à-d. le temps de parcours du gaz à travers le flexible renifleur (12).
EP05715976A 2004-06-18 2005-03-11 Detecteur de fuites a sonde renifleuse Withdrawn EP1756540A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004029637A DE102004029637A1 (de) 2004-06-18 2004-06-18 Lecksuchgerät mit Schnüffelsonde
PCT/EP2005/002614 WO2005124309A1 (fr) 2004-06-18 2005-03-11 Detecteur de fuites a sonde renifleuse

Publications (1)

Publication Number Publication Date
EP1756540A1 true EP1756540A1 (fr) 2007-02-28

Family

ID=34962043

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05715976A Withdrawn EP1756540A1 (fr) 2004-06-18 2005-03-11 Detecteur de fuites a sonde renifleuse

Country Status (6)

Country Link
US (1) US20080006080A1 (fr)
EP (1) EP1756540A1 (fr)
JP (1) JP4377433B2 (fr)
CN (1) CN1969176A (fr)
DE (1) DE102004029637A1 (fr)
WO (1) WO2005124309A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109791087A (zh) * 2016-09-19 2019-05-21 英福康有限责任公司 用细长的气体引导元件填充探头附件

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202005011372U1 (de) * 2005-07-20 2006-11-30 Inficon Gmbh Schnüffellecksuchgerät
DE102008011686A1 (de) * 2008-02-28 2009-09-03 Inficon Gmbh Heliumsensor
WO2011132365A1 (fr) * 2010-04-22 2011-10-27 株式会社アルバック Procédé de détection de fuite et dispositif de traitement sous vide
DE102013218506A1 (de) * 2013-09-16 2015-03-19 Inficon Gmbh Schnüffellecksucher mit mehrstufiger Membranpumpe
DE102013021313A1 (de) 2013-12-17 2015-06-18 Robert Brockmann Schnüffelsonde mit einer Fremdgasbarriere
CN106500916A (zh) * 2016-12-02 2017-03-15 广州供电局有限公司 Sf6带电检漏仪
FR3069639B1 (fr) * 2017-07-26 2019-08-30 Pfeiffer Vacuum Sonde de reniflage, detecteur de fuites et procede de detection de fuites
EP3567356B1 (fr) * 2018-05-07 2021-02-24 Inficon GmbH Détecteur de fuites par reniflage avec vanne de commutation et chambre tampon
CN110071031B (zh) * 2019-05-05 2020-05-05 东北大学 一种蛇形线式质谱仪连续性变压取样装置及方法
CN110672281A (zh) * 2019-09-26 2020-01-10 大族激光科技产业集团股份有限公司 一种气体泄露检测探针及气密性检测装置
FR3106765B1 (fr) * 2020-02-04 2022-12-30 Eveon Buse de pulvérisation de liquide sous forme de brouillard
CN112362720B (zh) * 2020-10-29 2022-12-27 河南中烟工业有限责任公司 箱装烟叶霉变检测方法

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Publication number Priority date Publication date Assignee Title
DE1246278B (de) * 1961-01-12 1967-08-03 Kernforschung Gmbh Ges Fuer Verfahren und Vorrichtung zur Auffindung von Leckstellen in mit Fluessigkeit gefuellten Anlagen und Rohrleitungen
US3999065A (en) * 1974-06-05 1976-12-21 Varian Associates Leak detection system with wire probe
DE2441124B2 (de) 1974-08-28 1979-07-19 Leybold-Heraeus Gmbh, 5000 Koeln Lecksucheinrichtung
DE2826605A1 (de) * 1978-06-19 1980-01-03 Leybold Heraeus Gmbh & Co Kg Schnueffelspitze fuer lecksucheinrichtungen
US4477986A (en) * 1981-05-08 1984-10-23 Bl Technology Limited Method of, and apparatus for, detecting leaks
US4583394A (en) * 1984-08-07 1986-04-22 Japan Atomic Energy Research Institute Device and method for leak location
JPS63163133A (ja) * 1986-12-24 1988-07-06 Tokin Corp 真空漏れ検査方法
FR2681688B1 (fr) * 1991-09-24 1993-11-19 Alcatel Cit Installation de detection de fuites de gaz utilisant la technique de reniflage.
DE4445829A1 (de) * 1994-12-22 1996-06-27 Leybold Ag Gegenstrom-Schnüffellecksucher
JPH11153507A (ja) * 1997-11-20 1999-06-08 Shimadzu Corp リークデテクタ
JP3698108B2 (ja) * 2002-02-20 2005-09-21 株式会社デンソー 気密漏れ検査方法及び装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005124309A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109791087A (zh) * 2016-09-19 2019-05-21 英福康有限责任公司 用细长的气体引导元件填充探头附件

Also Published As

Publication number Publication date
DE102004029637A1 (de) 2006-01-05
JP4377433B2 (ja) 2009-12-02
JP2008502885A (ja) 2008-01-31
US20080006080A1 (en) 2008-01-10
CN1969176A (zh) 2007-05-23
WO2005124309A1 (fr) 2005-12-29

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