EP1309843A1 - Verfahren und vorrichtung zur dichtheitsprüfung eines gasgenerators - Google Patents
Verfahren und vorrichtung zur dichtheitsprüfung eines gasgeneratorsInfo
- Publication number
- EP1309843A1 EP1309843A1 EP01969533A EP01969533A EP1309843A1 EP 1309843 A1 EP1309843 A1 EP 1309843A1 EP 01969533 A EP01969533 A EP 01969533A EP 01969533 A EP01969533 A EP 01969533A EP 1309843 A1 EP1309843 A1 EP 1309843A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas generator
- helium
- filled
- gas
- test chamber
- 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- Withdrawn
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
- G01M3/22—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 for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/226—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 for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
- G01M3/229—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 for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators removably mounted in a test cell
Definitions
- the invention relates to a method for leak testing a gas generator, in particular for airbags, in which the gas generator with a pressurized gas mixture, i.a. Helium is filled, the gas generator filled with the gas mixture is introduced into a test chamber, the test chamber is evacuated, helium escaping from a possibly existing leak is determined with the aid of a sensor and the signal supplied by the sensor is used to determine the tightness / leakage of the gas generator becomes.
- the invention also relates to a device suitable for carrying out this method.
- the leak test following the vaccination or bombing takes place within a test chamber, which is evacuated to a certain pressure after the test specimen has been introduced. If there is a leak, part of the helium present in the test object in low concentration penetrates outside into the test chamber and is detected using the sensor, usually a mass spectrometer.
- Gas generators especially for airbags, have to meet high safety requirements. This applies in particular to their service life. Before being used, they are checked for leaks, which typically must not exceed IGT 8 mbar / s. For this purpose, a relatively small amount of helium (eg 5%) is added to the compressed gas (usually C0 2 ) with which the gas generators are filled. This is followed by the integral leak detection described. In order to reach detection limits of this magnitude, it is necessary to evacuate the test chamber to relatively low pressures after introducing a gas generator. To achieve this goal, vacuum pumps with sufficiently low final pressures must be used. In addition, manufacturers of gas generators are demanding short cycle times. This can only be achieved if the vacuum pumps used also have a high pumping speed. It was therefore previously necessary to use relatively expensive pumping stations in leak detectors for gas generators that meet the requirements for low final pressures and high pumping speeds.
- the object of the present invention is to make the highly sensitive leak detection on gas generators, in particular for airbags, more economical.
- the helium content in the gas mixture of a gas generator according to the invention is between 80 and almost 100%, preferably between 90 and almost 100%. It is particularly advantageous if the gas generator is filled exclusively with helium.
- test chamber is used to carry out the leak detection, which has at least one flexible wall.
- test chambers of this type the test chamber dead volume - test chamber volume after evacuation and during helium detection - is minimized.
- the required pumping speed can be significantly reduced and further cost advantages can be achieved.
- test chambers with flexible walls as are known, for example, from DE-A-196 42 099, could not be used for leak detection on gas generators, since the required detection limit could not be achieved.
- the figure shows a gas generator 1 containing at least 50% helium, which was introduced into a film test chamber 2, as is known from DE-A-196 42 099.
- the film test chamber 2 comprises a frame construction (frames 3 and 4) in which films 5 and 6 are clamped.
- the foils 5, 6 are equipped in the area of the test specimen 1 with means (for example pore foil sections 7, 8) which ensure a coherent space 11 between the foils 5, 6 on the one hand and the test specimen 1 on the other.
- the space between the foils 5, 6 is evacuated.
- the foils 5, 6 rest against the test object 1 and form a test space 12 which comprises the intermediate space 11 formed by the means 7, 8 and the volume of the test object 1.
- the test room is evacuated via a central connection 13, which e.g. can be designed as a hose connection 14 and is connected to the line 18.
- the means 7, 8 forming the intermediate space do not extend into the edge area of the foils 5, 6, so that the outer sealing of the test space is achieved in that the foils 5, 6 immediately contact one another after an evacuation begins in the edge area. Further evacuation and the leak test are carried out via connection 13.
- test chamber 12 A pressure is generated in the test chamber 12 which is sufficiently low to allow test gas located within the test object 1 to escape, in the event of a leak.
- the test gas is detected in a manner known per se with a test gas sensitive detector connected to the intermediate space 11 / test space 12. This and all other devices that serve to operate the film test chamber 2 are known and are therefore not shown.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2000140074 DE10040074A1 (de) | 2000-08-16 | 2000-08-16 | Verfahren und Vorrichtung zur Dichtheitsprüfung eines Gasgenerators |
DE10040074 | 2000-08-16 | ||
PCT/EP2001/008706 WO2002014824A1 (de) | 2000-08-16 | 2001-07-27 | Verfahren und vorrichtung zur dichtheitsprüfung eines gasgenerators |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1309843A1 true EP1309843A1 (de) | 2003-05-14 |
Family
ID=7652651
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01969533A Withdrawn EP1309843A1 (de) | 2000-08-16 | 2001-07-27 | Verfahren und vorrichtung zur dichtheitsprüfung eines gasgenerators |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1309843A1 (de) |
JP (1) | JP2004506891A (de) |
CN (1) | CN1447912A (de) |
AU (1) | AU2001289764A1 (de) |
DE (1) | DE10040074A1 (de) |
WO (1) | WO2002014824A1 (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101408466B (zh) * | 2008-11-08 | 2010-06-02 | 宁夏电力科技教育工程院 | 管壳式换热器的泄漏检测方法及检测装置 |
DE102011086486B4 (de) * | 2011-11-16 | 2023-01-19 | Inficon Gmbh | Vorrichtung und Verfahren zur schnellen Lecksuche an formsteifen/schlaffen Verpackungen ohne Zusatz von Prüfgas |
DE102012200063A1 (de) | 2012-01-03 | 2013-07-04 | Inficon Gmbh | Verfahren zur Lecksuche an einem nicht formstarren Prüfling |
DE102014205032A1 (de) * | 2014-03-18 | 2015-09-24 | Inficon Gmbh | Dichteanstiegsmessung in Folienkammer |
DE102014224799A1 (de) * | 2014-12-03 | 2016-06-09 | Inficon Gmbh | Dichtheitsprüfung mit Trägergas in Folienkammer |
CN105987796A (zh) * | 2015-02-12 | 2016-10-05 | 广州市和晋自动化控制技术有限公司 | 一种气体浓度探测方法及装置 |
CN105004495B (zh) * | 2015-07-02 | 2017-07-18 | 高田(长兴)汽车安全装置有限公司 | 气体发生器出气口铝箔贴附密封性检测装置及其检测方法 |
AT519682A1 (de) | 2017-02-24 | 2018-09-15 | Mits Gmbh | Verfahren zum Überprüfen einer Dichtheit eines flexiblen Behälters |
EP3690419B1 (de) * | 2019-02-01 | 2021-11-03 | Sartorius Stedim Fmt Sas | System und verfahren zur erfassung eines möglichen integritätsverlustes einer flexiblen tasche für biopharmazeutische produkte |
EP3757538B1 (de) * | 2019-06-26 | 2023-06-14 | Sartorius Stedim Fmt Sas | System und verfahren zur erfassung eines möglichen integritätsverlustes einer flexiblen tasche für biopharmazeutische produkte |
CN110207903B (zh) * | 2019-07-03 | 2020-06-02 | 清华大学 | 一种可控温高压气体下密封性能测试实验装置 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5375456A (en) * | 1993-11-18 | 1994-12-27 | Trw Vehicle Safety Systems Inc. | Leak testing apparatus and method |
US5913537A (en) * | 1995-06-09 | 1999-06-22 | Trw Vehicle Safety Systems Inc. | Hybrid inflator including non-metallic nitrogen containing ignitable material |
DE19642099A1 (de) * | 1996-10-12 | 1998-04-16 | Leybold Vakuum Gmbh | Prüfung der Dichtheit von Verpackungen |
-
2000
- 2000-08-16 DE DE2000140074 patent/DE10040074A1/de not_active Withdrawn
-
2001
- 2001-07-27 EP EP01969533A patent/EP1309843A1/de not_active Withdrawn
- 2001-07-27 WO PCT/EP2001/008706 patent/WO2002014824A1/de active Application Filing
- 2001-07-27 CN CN 01814198 patent/CN1447912A/zh active Pending
- 2001-07-27 AU AU2001289764A patent/AU2001289764A1/en not_active Abandoned
- 2001-07-27 JP JP2002519907A patent/JP2004506891A/ja not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO0214824A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2002014824A1 (de) | 2002-02-21 |
CN1447912A (zh) | 2003-10-08 |
AU2001289764A1 (en) | 2002-02-25 |
JP2004506891A (ja) | 2004-03-04 |
DE10040074A1 (de) | 2002-02-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20030128 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO SI |
|
RBV | Designated contracting states (corrected) |
Designated state(s): CH DE FR GB IT LI |
|
17Q | First examination report despatched |
Effective date: 20081127 |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20101001 |