WO2015014419A1 - Dispositif d'injection de gaz témoin et procédé de détermination de la sensibilité d'un contrôle d'étanchéité - Google Patents

Dispositif d'injection de gaz témoin et procédé de détermination de la sensibilité d'un contrôle d'étanchéité Download PDF

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Publication number
WO2015014419A1
WO2015014419A1 PCT/EP2014/001401 EP2014001401W WO2015014419A1 WO 2015014419 A1 WO2015014419 A1 WO 2015014419A1 EP 2014001401 W EP2014001401 W EP 2014001401W WO 2015014419 A1 WO2015014419 A1 WO 2015014419A1
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WO
WIPO (PCT)
Prior art keywords
test gas
test
feed pump
injection device
gas supply
Prior art date
Application number
PCT/EP2014/001401
Other languages
German (de)
English (en)
Inventor
Robert Brockmann
Original Assignee
Robert Brockmann
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 Robert Brockmann filed Critical Robert Brockmann
Priority to EP14729588.5A priority Critical patent/EP3028026A1/fr
Publication of WO2015014419A1 publication Critical patent/WO2015014419A1/fr

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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
    • G01M3/207—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 calibration arrangements
    • 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

Definitions

  • the invention relates to a Testgasinjetechnischsvortechnisch and a method for determining the sensitivity of a leak-tightness test, preferably a leak test, in which a test chamber is exposed to a test gas-free inert gas. More particularly, the invention relates to a test gas injection device used to measure the sensitivity of a measuring device according to the partial vacuum method according to the method described in the standard DIN EN ISO 15848-1 of the German Institute for Standardization or in the document DE 10 2006 016 074 can be. The invention further relates to a method for providing a test leak for determining the sensitivity of a leak test.
  • test specimen the object to be checked for tightness
  • test gas-free purging gas such as a helium-free purging gas
  • Vacuum test gas methods according to DIN EN 1779 are known from the prior art for such leak tests, in which permeation leaks, so-called vacuum test leaks, are generally used.
  • the test chamber is evacuated with a leak detector.
  • test gas flows through the test chamber to the leak detector. This determines the test gas concentration in the pumped gas stream and determines from this the leakage rate.
  • vacuum test leaks are described, for example, in the article "Helium leak leak rate stability", W. Jitschin, Vakuum in Anlagen undtechnik (1999) No. 3165-167.
  • Vacuum test leaks applied to the test gas helium test gas flows have between 5.0 E-10 to 1.0 E- 4 mbar * 1 / s.
  • a disadvantage of the described vacuum test leaks is that they are unsuitable for determining the sensitivity of a measuring system in which the test chamber is exposed to a helium-free purging gas.
  • One reason for this is that in a vacuum test leak with a glass membrane, the test gas flow first adjusts itself to a vacuum. Therefore, vacuum test leaks with a Teflon membrane have been proposed.
  • Test gas flows in this way are between 1.0 E-7 and 1.0 E-4 mbar x 1 / s feasible.
  • a disadvantage of the proposed vacuum test leaks is that such vacuum test leaks when used in partial vacuum dekalibr Schliffers very quickly.
  • Other approaches known from the prior art are the use of capillary test leaks in vacuum test gas methods of so-called diaphragm test leaks. Such test leaks permit the detection of the sensitivity of the leakage rates up to 1.0 E-6 mbar * 1 / s in the vacuum test gas method.
  • the risk of a decalibration of these test leaks in a helium-free atmosphere is lower than in the case of vacuum test leaks, since the capillary test leaks as well as the diaphragm test leaks usually have a test gas reservoir with overpressure, these leakages are, however, disadvantageous large test gas volume flows.
  • Another disadvantage of such test leaks is that these test leaks quickly clog up, have a complicated flow characteristic, and the strong dependence of the test gas flow on the
  • test gas flow is dependent on the pressure of the gas storage tank.
  • test device with a test gas reservoir, a pressure reducer and a capillary.
  • pressure in the gas reservoir is monitored with a pressure gauge.
  • the test gas is passed from the reservoir to a pressure reducer which maintains a constant overpressure to the atmosphere to deliver the test gas stream independently of the pressure in the reservoir.
  • This special type of capillary leak test allows only limited determination of the measurement sensitivity of a measuring arrangement, the envelope or chamber is subjected to a partial vacuum.
  • a problem here is, for example, the strong dependence of the test gas flow from the pressure at the outlet of the test leak.
  • Another disadvantage of this type of capillary leak test for determining the sensitivity is its inertness, so that flexible use with this type of capillary leak test is not possible.
  • An object of the invention is to provide a Testgasinj etechnischsvor- direction for determining the sensitivity of a leak ⁇ test, which avoids the disadvantages of conventional Testgasinjetechnischsvortechnischen.
  • the test gas injection device is intended to be particularly suitable for use in a leak test in which a test chamber is exposed to a test gas-free inert gas, and for use in a measurement of the sensitivity of a measuring device according to the partial vacuum method.
  • the object of the invention is in particular to provide a test gas injection device which allows a high detection sensitivity, is easy to handle, requires little maintenance and can be adapted to different measuring tasks.
  • a further object is to provide a method for providing a test leak, with which disadvantages of conventional methods can be avoided.
  • a Testgasinj tion device hereinafter also referred to as Testgasinjektor proposed, comprising a feed pump.
  • the feed pump is set up to compress a test gas.
  • the test gas injection device comprises a test gas supply device for introducing the compressed test gas into a test gas supply device Test chamber.
  • the compressed by the pump test gas is passed with positive pressure compared to the ambient pressure to the test gas supply.
  • the means for throttling thus forms a flow resistance for the test gas.
  • the test gas supply means with the means for throttling the test gas is hereinafter also referred to as a test leak, as exits the test gas supply device in the operated state, a predetermined leakage current of the test gas and thus a test leak is formed.
  • test gas used may be air, preferably ordinary ambient air, which generally has a helium concentration of 5.2 ppm.
  • the feed pump for example, have an outwardly directed air intake, which sucks ambient air during operation, which is then compressed in the feed pump.
  • the test gas injection device according to the invention can be used for
  • Determination of the sensitivity of a leak test can be used, preferably for determining the sensitivity of a measuring arrangement according to the partial vacuum method according to the method described in DIN EN ISO 15848-1 or in DE 10 2006 016 747.
  • testgaszussel a feed pump for compressing the test gas with a subsequently arranged Testgaszussel
  • a means for throttling the test gas allows the generation of a steady stream of test gas, which can also be used in the partial vacuum method to the test gas in one with a test - Initiate gas-free inert gas applied test chamber.
  • Another advantage is that decalibration or clogging as known in the art
  • Measuring devices occurs, is reliably avoided.
  • test gas in the sense of this invention can consist of a single gas or a gas mixture. It is a particular advantage of the invention that normal ambient air can be used as the test gas.
  • An advantageous gas mixture is an SF6-air mixture.
  • the test gas supply device comprises a hose, preferably a compressed air hose and / or a flexible hose.
  • the hose can be connected directly to an outlet of the feed pump.
  • the hose can also be connected only indirectly to the feed pump, for example via a further test gas line, e.g. in the form of a pipeline.
  • the test gas supply means is formed of a non-corrosive material.
  • the means for throttling the test gas is formed from a bundle of strands, preferably made of a fine-stranded stranded cable, for. B. of copper.
  • the stranded cable forms a flow resistance for the test gas.
  • the formation of the throttling means with the aid of a bundle of stranded cables represents a particularly effective and at the same time cost-effective possibility for forming a flow resistance.
  • the desired size of the flow resistance is determined by the corresponding length and / or thickness of the bundle of strands or stranded cable can be adjusted.
  • a flow resistance can also be realized according to the invention by other suitable means.
  • a sintered metal can be introduced into the test gas supply.
  • Other examples are a microclip, a capillary and / or a porous material.
  • the test gas injector therefore comprises a multiplicity of different test gas supply devices, which are arranged detachably and / or exchangeably in the test gas device.
  • the test gas injector or the flow resistance can be adapted to different measurement requirements by replacing the test gas supply device.
  • the means for throttling the test gas are introduced into the test gas supply device in such a manner that the test gas flows out into the environment only via this throttling means or via this flow resistance.
  • a particularly simple embodiment provides that, for example, the stranded cable is glued gas-tight with the tube.
  • test gas volume flow depends on the one hand on the pressure of the test gas before the test leak and on the flow resistance of the test leak.
  • the Testgasvolumen- ström can be adjusted to a desired value in the range of 0.1 ml / s to 200 ml / s .
  • a particular advantage of the invention is therefore that by the throttling of the test gas pressure, a constant and adjustable test gas volume flow can be generated.
  • the test gas pressure generated by the pump upstream of the test gas supply device is in the range of 10 mbar to 200 mbar.
  • the test gas supply means is adapted for coupling with a cannula, a hollow ⁇ needle or a hypodermic needle.
  • the test gas supply means has a standard attachment of a Luer lock connection system or a Luer-system or a conical geNorm ⁇ th system.
  • the feed pump can also be coupled to the test gas supply device via such a standardized attachment.
  • test gas supply device may comprise a cannula, a hollow needle or an injection needle which is designed as part of the test gas supply device or is detachably attached to the test gas supply device, so that the test gas flows out of the test gas injection device via the cannula, hollow needle or injection needle.
  • the test gas can be precisely introduced into a test chamber.
  • the test gas injection device comprises a control device and a display unit, which is set up to regulate a pressure of the test gas when entering the test gas supply to a predetermined value or a predetermined course.
  • the control device and display unit is advantageously set up to test gas pressure before the test gas. supply device to determine.
  • the pump is designed as a speed-controlled or multi-stage pump, so that it can be controlled by the control unit accordingly to provide a predetermined pressure of the test gas upon entry into the test gas supply.
  • the delivery pump can be regulated with a frequency converter.
  • a valve may be provided between the feed pump and the test gas supply means. Furthermore, a valve upstream of a suction nozzle of the pump can be provided. With these valves can also be done by appropriate control of the valve position adjustment of the test gas flow to z. B. to reduce the test gas pressure or increase. Furthermore, there is also the possibility of having a regulated
  • Overflow valve to regulate the pressure before the test leak.
  • an overflow valve is opened, so that test gas flows to the environment.
  • the test gas is returned from the overflow valve between pump and test gas supply device via a bypass line to a suction port of the pump.
  • the test gas can also be recycled via the bypass line to a test gas container.
  • an air mixture for example an SF6-air mixture, is used as the test gas, since this mixture is then not demixed.
  • the test gas is provided in a pressurized test gas container, which is arranged upstream of the feed pump.
  • a pressure reducer between the pressurized test gas container and the feed pump is further arranged. This variant allows a particularly accurate adjustment of the pressure before the test leak.
  • a particular advantage of the invention is that with the Testgasinjetechnischsvortechnischen described above, the pressure before the test leak can be controlled in a controlled manner to minimize the test gas flow so far that a test gas stream with a leakage rate of about 1.0 E-09 mbar x 1 / s can be realized.
  • test gas injection device is particularly advantageous for injecting a steady test gas stream into a test chamber which is exposed to a test gas-free inert gas, in particular a helium-free inert gas with a purity of 10 ppt.
  • a method for determining the sensitivity of a leak test in which a test gas stream is introduced with a test gas injection device, as described above, into a test chamber, which is exposed to a test gas-free inert gas.
  • a pressure of the test gas stream when entering the test gas supply device is at least 10 mbar higher than the pressure within the test chamber.
  • a test gas air, a gas or a gas mixture can be used.
  • the test chamber is in this case preferably charged with a helium-free inert gas with a purity of 10 ppt.
  • FIG. 1 shows a test gas injector according to an exemplary embodiment
  • FIG. 2 shows a test gas injector according to an exemplary embodiment
  • FIG. 3 shows a test gas injector with frequency converter according to an exemplary embodiment
  • FIG. 4 shows a test gas injector with overflow valve according to an embodiment
  • FIG. 5 shows a test gas injector with bypass according to an exemplary embodiment
  • FIG. 1 shows a test gas injector with bypass and through-flow test gas container according to an exemplary embodiment
  • FIG. 7 shows a test gas injector with a throttle device in front of the feed pump according to an exemplary embodiment
  • FIG. 8 test gas injector with a test gas container with
  • FIG. 1 shows an exemplary embodiment of a test gas injector according to the invention.
  • the test gas injector 1 comprises a delivery pump 10 with. an intake manifold 11, via which the feed pump 10 sucks in test gas.
  • the compressed by the feed pump 10 test gas, z. B. ambient air, exits on the opposite side of the intake manifold 11 from the feed pump 10 and is a test gas line 14, which is connected via an adapter element 12 with the feed pump 10, passed to the test gas supply 13, in the present embodiment as a flexible Hose, eg a 6 mm compressed air hose made of polyethylene, is executed.
  • the hose contains a bundle of ultrafine stranded high-grade strands, eg. B.
  • test gas flows of up to 1.0 E-09 mbar x 1 / s can be realized.
  • a capillary, orifice, or other type of choke may be used instead of a copper stranded cable.
  • a cannula 18 is mounted on the tube, which facilitates the handling of the test gas injection device in order to introduce the test gas into a test chamber 100.
  • the adapter element 17 for fastening the cannula 18 on the tube 15 is designed as a standardized conical adapter system, for example as a Luer-lock system.
  • the adapter element 12 between the feed pump 10 and the line 14 may be formed as a standardized adapter element.
  • the test chamber 100 is charged with a helium-free purging gas.
  • a test specimen (not shown) for leak testing can then be introduced into the test chamber 100.
  • the test gas injector 1 in Figure 1 further comprises a control device and a display unit 20 which is connected via a control signal line 21 to a pressure sensor 22 which measures the pressure in the tube 15.
  • the corresponding knowledge of the pressure upstream of the test gas supply device 13 makes it possible to determine the test gas volume flow injected into the cover 100 via a corresponding p-V value table which correlates the measured pressure p with the injected test gas volume flow V and can be stored in the control unit 20.
  • test gas injector 2 shown in FIG. 2 comprises a control valve 23 in front of the pressure sensor 22 and the test gas supply device 13.
  • the control valve 23 allows the pressure in the hose 15 to be adapted to the test task.
  • FIG. 3 shows a further exemplary embodiment of a test gas injector 3, in which the feed pump 10 is regulated by a frequency converter 36 in order to regulate the overpressure within the test leak 13 or before the test leak 13.
  • the control unit and display unit 20 is connected via control lines both to the frequency converter 36 and to the pressure sensor 22.
  • an overflow valve 24 is provided at the outlet of the feed pump 10.
  • the control unit 20 controls the overflow valve 24 via an actuator 25 in order to open or close the overflow valve, so that test gas flows out into the environment via a line 37.
  • the pressure in front of the test gas supply device 13 can be adjusted in a simple manner.
  • FIG. 5 shows an exemplary embodiment of the test gas injector 5, in which the test gas discharged via the overflow valve 24 is not conducted into the ambient air, but via a bypass line 26 back to the intake port 11 of the feed pump 10.
  • This variant also makes it possible to regulate the pressure before the test leak to a desired value.
  • the test gas is provided by a gas container 30, which is connected via a flange 28 to the intake 11 of the feed pump 10.
  • the overflow valve 24 with the derived test ⁇ gas are conducted via a bypass line 27 and back to the Testgasbefeld- ter 30, which is connected via a flange 29 with the bypass line 27 is.
  • This variant has the advantage that in a test gas mixture, such as a SF6-air mixture, the mixture is not separated.
  • Figure 7 shows another embodiment 7, in which a throttle element 31 is arranged in front of the intake 11 of the feed pump 10.
  • the throttle element 31 for example a valve, is actuated to regulate the pressure of the control unit and display unit 20 via an actuator 32.
  • FIG. 8 shows a further variant 8, in which a test gas source 34 with overpressure and a subsequently arranged pressure reducer 35 is used.
  • a pressure generating unit 33 for. As a pump, generates the pressure in the test gas container 34.
  • the pressure reducer 35 allows the adjustment of the pressure in front of the test gas supply 13, so that the pressure before the test leak of the test gas supply can be adjusted.
  • the embodiments shown show that in addition to the possibility with a speed-controlled pump, it is also possible, a controlled, preferably slow increase or decrease of the pressure before the test leak by opening or closing the actuators, such as the valves of the bypass variant to enable. Another alternative is to clock the actuator, closing or opening the valve in steps before the bypass.
  • the pressure before the test leak is at least 10 mbar greater than the pressure within the test chamber 100. This ensures that the pressure before the test leak 13 is so great that the influence of the pressure within the test chamber 100 has no influence has the test gas flow into the test chamber 100.
  • the leakage rate can also be adjusted by changing the test gas concentration. This can for example, by replacing the test gas source done.
  • Another option is to fill the source with a test gas mixture.
  • the container is mixed with air and with the test gas in a pre-calculated ratio.
  • test leak can also be replaced by another test leak - with known flow resistance - and thus the test gas flow can be adapted to the requirements of the measurement task.
  • tube 15 can be replaced by another tube with different length and thus different flow resistance.
  • the flushing of the test gas injector can be done by increasing the pressure before the test leak. Increasing the pressure before the test leak causes the test gas flow to increase above the test leak.
  • bypass valve is opened for purging, so that gas flows back through the bypass and the source to the feed pump.
  • This rinse is of particular importance for gases that segregate easily, such as. B. an SF6-air mixture.

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

Abstract

L'invention concerne un dispositif d'injection de gaz témoin et un procédé de détermination de la sensibilité d'un contrôle d'étanchéité, de préférence d'un contrôle d'étanchéité qui consiste à exposer une chambre de contrôle à un gaz de protection exempt de gaz témoin. Le dispositif d'injection de gaz témoin comprend une pompe d'alimentation (10) qui est conçue pour comprimer un gaz témoin, et un dispositif d'amenée de gaz témoin (13) servant à introduire le gaz témoin comprimé dans une chambre de contrôle (100), le dispositif d'amenée de gaz témoin (13) comprenant un moyen (16) d'étranglement du gaz témoin.
PCT/EP2014/001401 2013-07-31 2014-05-23 Dispositif d'injection de gaz témoin et procédé de détermination de la sensibilité d'un contrôle d'étanchéité WO2015014419A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14729588.5A EP3028026A1 (fr) 2013-07-31 2014-05-23 Dispositif d'injection de gaz témoin et procédé de détermination de la sensibilité d'un contrôle d'étanchéité

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013012795.5 2013-07-31
DE201310012795 DE102013012795A1 (de) 2013-07-31 2013-07-31 Testgasinjektionsvorrichtung und Verfahren zur Bestimmung der Empfindlichkeit einer Dichtheitsprüfung

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WO2015014419A1 true WO2015014419A1 (fr) 2015-02-05

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PCT/EP2014/001401 WO2015014419A1 (fr) 2013-07-31 2014-05-23 Dispositif d'injection de gaz témoin et procédé de détermination de la sensibilité d'un contrôle d'étanchéité

Country Status (3)

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EP (1) EP3028026A1 (fr)
DE (1) DE102013012795A1 (fr)
WO (1) WO2015014419A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013017888A1 (de) 2013-10-28 2015-04-30 Robert Brockmann Verfahren zur Verheilung der Passivschicht eines Bauteils von Aluminium zur Wiedererlangung der Gasdichtheit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3800586A (en) * 1972-04-24 1974-04-02 Uson Corp Leak testing apparatus
US6314794B1 (en) * 1998-11-26 2001-11-13 Alcatel Method and apparatus for detecting leaks in heat exchangers for motor vehicles
DE102006016747A1 (de) 2006-04-10 2007-10-18 MAX-PLANCK-Gesellschaft zur Förderung der Wissenschaften e.V. Verfahren und Vorrichtung zur Leckprüfung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3800586A (en) * 1972-04-24 1974-04-02 Uson Corp Leak testing apparatus
US6314794B1 (en) * 1998-11-26 2001-11-13 Alcatel Method and apparatus for detecting leaks in heat exchangers for motor vehicles
DE102006016747A1 (de) 2006-04-10 2007-10-18 MAX-PLANCK-Gesellschaft zur Förderung der Wissenschaften e.V. Verfahren und Vorrichtung zur Leckprüfung

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
W. JITSCHIN: "Prüflecks für Schnüffel-Lecksucher - Reference leaks for sniffer leak detectors", VAKUUM IN FORSCHUNG UND PRAXIS, vol. 15, no. 4, 1 August 2003 (2003-08-01), pages 188 - 193, XP055144131, ISSN: 0947-076X, DOI: 10.1002/vipr.200300185 *
W. JITSCHIN: "Prüflecks für Schnüffel-Lecksucher", VAKUUM IN FORSCHUNG UND PRAXIS, 2003, pages 188 - 193
W. JITSCHIN: "Stabilität der Leckrate von Helium-Testlecks", VAKUUM IN FORSCHUNG UND PRAXIS, 1999, pages 3165 - 167

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EP3028026A1 (fr) 2016-06-08

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