EP1444495A1 - Test gas leakage detector - Google Patents
Test gas leakage detectorInfo
- Publication number
- EP1444495A1 EP1444495A1 EP02787638A EP02787638A EP1444495A1 EP 1444495 A1 EP1444495 A1 EP 1444495A1 EP 02787638 A EP02787638 A EP 02787638A EP 02787638 A EP02787638 A EP 02787638A EP 1444495 A1 EP1444495 A1 EP 1444495A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- inlet
- vacuum pump
- test gas
- valve
- detector
- 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- Withdrawn
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Classifications
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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
- 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
Definitions
- the invention relates to a test gas leak detector with the features of the preamble of claim 1.
- Leak detectors of this type are also referred to as countercurrent leak detectors, since the test gas which reaches the test gas detector via the intermediate entry into the high vacuum pump system (one or more high vacuum pump stage (s), preferably friction pump stages), flows against the conveying direction of the pump system.
- the leak detection is carried out in such a way that the inlet of the device is connected, for example, to a test object which is sprayed with test gas from the outside. In the event of a leak, test gas penetrates the test object and is detected using the test gas detector.
- a test chamber can also be connected to the inlet of the leak detector in which there are one or more test specimens containing test gas.
- test gas enters the test chamber and is detected with the help of the test gas detector.
- the vacuum leak detection described can be qualitative or quantitative be carried out. Helium has proven itself as a test gas.
- a leak detector of the type concerned here is known from US 4,472,962.
- a test chamber is connected to its inlet.
- the test chamber is evacuated via the norvacuum pump, which is required for the operation of the high vacuum pump system designed as a turbomolecular vacuum pump.
- gas to be examined for the presence of a test gas is fed to an intermediate inlet on the turbomolecular pump.
- the present invention has for its object to improve the leak detection device according to the prior art in terms of speed and sensitivity of the leak detection.
- this object is achieved by the characterizing features of the claims.
- boost pump high-vacuum pump
- the detection sensitivity remains high, since it is only determined by the high vacuum pump system and the design of its counterflow stages.
- the evacuation time becomes short, which lent through a rel. high switching pressure on the booster pump is reached.
- the figure shows schematically the components of the leak detector 1, the inlet of which is designated 2.
- Two line sections 3 and 4 connect to the inlet.
- Line section 3 is equipped with a valve 5 and is connected via the line section 6 to the inlet 7 of the fore-vacuum pump 8.
- the line 4 there are a valve 9 and a high vacuum pump 11 (booster pump), the outlet 12 of which is connected to an intermediate inlet 14 on a second high vacuum pump 15 via a continuously open line section 13.
- the outlet 12 of the high vacuum pump 11 is also connected via the line sections 16 - with valve 17 - and 6 to the inlet 7 of the fore vacuum pump 8.
- the high-vacuum pump 15 is the leak detection pump through which the test gas flows, at least in sections, against its conveying direction.
- the test gas detector 22 is connected to its inlet 21 — preferably a mass spectrometer when helium is used as the test gas. Its outlet 23 is connected via the line section 24 to the inlet 7 of the forevacuum pump 8. In the line section 24 there is a throttle 25 and a valve 26, in the direction of flow, which can also be designed as a component (eg valve with a small nominal width).
- Two pressure measuring devices 27 and 28 provide information about the inlet pressure (device 27) and the pressure at the intermediate inlet 14 (device 28).
- the leak detection mode is controlled using the pressure signals supplied.
- a controller and associated lines are not shown.
- valve 26 can be opened after a short time (inlet pressure a few mbar, depending on the properties of the pump 15). If the test specimen has a gross leak, test gas passes through valve 26, throttle 25 and high vacuum pump 15 (in countercurrent) to detector 22 and is registered.
- valve 5 is closed and valves 9 and 17 are closed. be opened.
- This step can be done at the point in time when the inlet pressure has approximately the value that is necessary at the intermediate inlet (14) in order to just maintain the working pressure in the test gas detector (mass spectrometer).
- the pumping speed of the booster pump 11 is small, so it does not cause a harmful pressure increase at the intermediate inlet.
- the pumping speed of the fore-vacuum pump 8 is even greater than the pumping speed of the booster pump 11. If the test object has minor leaks, these are recognized (fine leak detection).
- the test object With increasing pressure decrease at the inlet 2, the pumping speed of the booster pump 11 increases, the test object is evacuated relatively quickly to low pressures. If, for example, the inlet pressure has reached a value of 10 "2 mbar, the highly sensitive leak detection begins by closing the valve 17. A test gas escaping from a test gas that may still be present and very small leaks completely into the intermediate inlet 14 and is measured by the mass spectrometer 22 registered.
- Oil-sealed or dry (oil-free) pumps can be used as the backing pump 8, expediently with a pumping speed> 16 m 3 h (ie, relatively "large” pumps) because of the relatively large volumes of the test specimen or test chamber.
- the throttle 25 causes the sensitivity for the leak detection, determined by K ⁇ .
- the booster turbomolecular pump 11 should be selected such that it already has a significant pumping speed even at high inlet pressure. It applies to the leak detection pump 15 that it has a relatively high compression in the lower region in order to isolate the unstable forevacuum pump.
- An embodiment according to the figure can be implemented particularly advantageously with a speed-controlled turbopump 11 at the inlet 2 of the leak detector 1. While in the solution with an unregulated pump speed the line 16 with the valve 17 is required in order to first discharge the increased gas flow in the so-called “cross-over" (transition to fine leak detection, opening of the valve 9) into the backing pump 8, line 16 and valve 17 can also be saved if the speed of the booster TMP 11 each. is regulated so that the maximum permissible gas flow is not exceeded. This means that the condition that the pumping speed of the pump 11 is not exceeded at the beginning of the "cross-over" is achieved by speed control.
- the booster pump 11 runs at a low "standby" speed as long as the inlet valve 9 is closed. As soon as the inlet pressure has fallen below the casual value for the valve-less intermediate inlet 14 of the counterflow pump, valve 5 is closed and valve 9 is opened. At this moment, the effective pumping speed of the booster pump 11 must be approximately equal to the previous pumping speed. be pump 8 so that there is no pressure increase in the fore vacuum.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
Description
TESTGASLECKSUCHGERATTESTGASLECKSUCHGERAT
Die Erfindung bezieht sich auf ein Testgaslecksuchge- rät mit den Merkmalen des Oberbegriffs des Patentanspruchs 1.The invention relates to a test gas leak detector with the features of the preamble of claim 1.
Lecksuchgeräte dieser Art werden auch als Gegenstrom- lecksuchgeräte bezeichnet, da das über den Zwischeneintritt in das Hochvakuumpumpsystem (eine oder mehrere hintereinander geschaltete Hochvakuumpumpstufe (n) , vorzugsweise Reibungspumpstufen) gelangende Testgas entgegen der Förderrichtung des Pumpsystems zum Testgasdetektor strömt. Die Lecksuche erfolgt in der Weise, dass der Einlaß des Gerätes z.B. mit einem Prüfling verbunden wird, der von außen mit Testgas besprüht wird. Im Falle eines Lecks dringt Testgas in den Prüfling ein und wird mit Hilfe des Testgasdetektors festgestellt. An den Einlaß des Lecksuchgerätes kann auch eine Testkammer angeschlossen werden, in der sich ein oder mehrere Testgas enthaltende Prüflinge befinden. Während der Lecksuche gelangt für den Fall, dass der bzw. ein Prüfling leck ist, Testgas in die Testkammer und wird mit Hilfe des Testgasdetektors nachgewiesen. Die geschilderte Vakuumlecksuche kann qualitativ oder quanti- tativ durchgeführt werden. Als Testgas hat sich Helium bewährt .Leak detectors of this type are also referred to as countercurrent leak detectors, since the test gas which reaches the test gas detector via the intermediate entry into the high vacuum pump system (one or more high vacuum pump stage (s), preferably friction pump stages), flows against the conveying direction of the pump system. The leak detection is carried out in such a way that the inlet of the device is connected, for example, to a test object which is sprayed with test gas from the outside. In the event of a leak, test gas penetrates the test object and is detected using the test gas detector. A test chamber can also be connected to the inlet of the leak detector in which there are one or more test specimens containing test gas. During the leak detection, if the or a test object is leaking, test gas enters the test chamber and is detected with the help of the test gas detector. The vacuum leak detection described can be qualitative or quantitative be carried out. Helium has proven itself as a test gas.
Aus der US 4 472 962 ist ein Lecksuchgerät der hier betroffenen Art bekannt. An seinen Einlaß ist eine Testkammer angeschlossen. Die Evakuierung der Testkammer erfolgt über die Norvakuumpumpe, die für den Betrieb des als Turbomolekularvakuumpumpe ausgebildeten Hochvakuumpumpsystems erforderlich ist. Während der Lecksuche wird auf das Vorhandensein eines Testgases zu untersuchendes Gas einem Zwischeneintritt an der Turbomolekularpumpe zugeführt .A leak detector of the type concerned here is known from US 4,472,962. A test chamber is connected to its inlet. The test chamber is evacuated via the norvacuum pump, which is required for the operation of the high vacuum pump system designed as a turbomolecular vacuum pump. During the leak detection, gas to be examined for the presence of a test gas is fed to an intermediate inlet on the turbomolecular pump.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, das Lecksuchgerät nach dem Stand der Technik hinsichtlich Schnelligkeit und Empfindlichkeit der Lecksuche zu verbessern.The present invention has for its object to improve the leak detection device according to the prior art in terms of speed and sensitivity of the leak detection.
Erfindungsgemäß wird diese Aufgabe durch die kennzeichnenden Merkmale der Patentansprüche gelöst. Durch den Einsatz der weiteren Hochvakuumpumpe (Boosterpumpe) wird erreicht, dass die an den Einlaß des Lecksuchgerätes angeschlossene Testkammer bzw. der an den Einlaß angeschlossene Prüfling mit kürzerer Ansprechzeit geprüft werden kann, da die Ansprechzeit von der Zeitkonstante τ = V/SHe bestimmt ist. V = Prüfling Volumen, SHe Saugvermögen der Boosterpumpe für He. Trotz des großen Saugvermögens der Boosterpumpe (11) bleibt die Nachweisempfindlichkeit hoch, da sie nur durch das Hochvakuumpumpsystem und die Auslegung ihrer Gegenstromstufen bestimmt ist. Durch den Einsatz einer rel . großen Vorvakuumpumpe wird die Evakuierungszeit kurz, was zusätz- lieh durch einen rel . hohen Umschaltdruck auf die Boosterpumpe erreicht wird.According to the invention, this object is achieved by the characterizing features of the claims. By using the additional high-vacuum pump (booster pump) it is achieved that the test chamber connected to the inlet of the leak detector or the test object connected to the inlet can be tested with a shorter response time, since the response time is determined by the time constant τ = V / S He , V = test specimen volume, S He pumping speed of the booster pump for He. Despite the high pumping speed of the booster pump (11), the detection sensitivity remains high, since it is only determined by the high vacuum pump system and the design of its counterflow stages. By using a rel. large backing pump, the evacuation time becomes short, which lent through a rel. high switching pressure on the booster pump is reached.
Überraschenderweise hat sich gezeigt, dass nicht nur die empfindliche, sondern auch die vorhergehenden Grob- und Feinlecksuchschritte bei offener Verbindung zwischen Austritt der weiteren Hochvakuumpumpe und Zwischeneintritt am Hochvakuumpumpsystem durchgeführt werden können. Diese Verbindung kann deshalb permanent offen gehalten werden. Der Einbau von Ventilen entfällt. Ein kontinμierlicher Messbetrieb von der Grob- bis zur hochempfindlichen Lecksuche, ist möglich.Surprisingly, it has been shown that not only the sensitive, but also the previous coarse and fine leak detection steps can be carried out with the connection between the outlet of the further high-vacuum pump and the intermediate inlet on the high-vacuum pump system. This connection can therefore be kept permanently open. There is no need to install valves. Continuous measurement operation from coarse to highly sensitive leak detection is possible.
Weitere Vorteile und Einzelheiten der Erfindung sollen anhand eines in der Figur dargestellten Ausführungsbei- spieles für ein Lecksuchgerät nach der Erfindung erläutert werden.Further advantages and details of the invention will be explained with reference to an exemplary embodiment for a leak detector according to the invention shown in the figure.
Die Figur zeigt schematisch die Bauteile des Lecksuchgerätes 1, dessen Einlass mit 2 bezeichnet ist. An den Einlass schließen sich zwei Leitungsabschnitte 3 und 4 an. Leitungsabschnitt 3 ist mit einem Ventil 5 ausgerüstet und steht über den Leitungsabschnitt 6 mit dem Eintritt 7 der VorVakuumpumpe 8 in Verbindung. In der Leitung 4 befinden sich ein Ventil 9 und eine Hochvakuumpumpe 11 (Boosterpumpe) , deren Austritt 12 über einen ständig offenen Leitungsabschnitt 13 mit einem Zwischeneintritt 14 an einer zweiten Hochvakuumpumpe 15 in Verbindung steht. Der Austritt 12 der Hochvakuumpumpe 11 ist außerdem über die Leitungsabschnitte 16 - mit Ventil 17 - und 6 mit dem Eintritt 7 der Vorvakuumpumpe 8 in Verbindung. Die Hochvakuumpumpe 15 ist die vom Testgas - zumindest abschnittsweise - entgegen ihrer Förderrichtung durchströmte Lecksuchpumpe. An ihren Eintritt 21 ist der Testgasdetektor 22 - bei der Verwendung von Helium als Testgas vorzugsweise ein Massenspektrometer - angeschlossen. Ihr Austritt 23 steht über dem Leitungsabschnitt 24 mit dem Eintritt 7 der Vorvakuumpumpe 8 in Verbindung. Im Leitungsabschnitt 24 befinden sich - in Strömungsrichtung - eine Drossel 25 und ein Ventil 26, die auch als ein Bauteil (z. B. Ventil mit geringer Nennweite) ausgebildet sein können.The figure shows schematically the components of the leak detector 1, the inlet of which is designated 2. Two line sections 3 and 4 connect to the inlet. Line section 3 is equipped with a valve 5 and is connected via the line section 6 to the inlet 7 of the fore-vacuum pump 8. In the line 4 there are a valve 9 and a high vacuum pump 11 (booster pump), the outlet 12 of which is connected to an intermediate inlet 14 on a second high vacuum pump 15 via a continuously open line section 13. The outlet 12 of the high vacuum pump 11 is also connected via the line sections 16 - with valve 17 - and 6 to the inlet 7 of the fore vacuum pump 8. The high-vacuum pump 15 is the leak detection pump through which the test gas flows, at least in sections, against its conveying direction. The test gas detector 22 is connected to its inlet 21 — preferably a mass spectrometer when helium is used as the test gas. Its outlet 23 is connected via the line section 24 to the inlet 7 of the forevacuum pump 8. In the line section 24 there is a throttle 25 and a valve 26, in the direction of flow, which can also be designed as a component (eg valve with a small nominal width).
Zwei Druckmessgeräte 27 und 28 liefern Information über den Einlassdruck (Gerät 27) und den Druck am Zwischeneintritt 14 (Gerät 28) . Mit Hilfe der gelieferten Drucksignale wird der Lecksuchbetrieb gesteuert. Eine Steuerung und zugehörige Leitungen sind nicht dargestellt.Two pressure measuring devices 27 and 28 provide information about the inlet pressure (device 27) and the pressure at the intermediate inlet 14 (device 28). The leak detection mode is controlled using the pressure signals supplied. A controller and associated lines are not shown.
Nach dem Anschluss eines Prüflings an den Einlass 2 erfolgt zunächst die Vorevakuierung des Prüflings. In dieser Phase sind alle Ventile - außer Ventil 5 - geschlossen. Bereits nach kurzer Zeit (Einlassdruck einige mbar, je nach den Eigenschaften der Pumpe 15) kann das Ventil 26 geöffnet werden. Sollte der Prüfling ein grobes Leck aufweisen, gelangt Testgas durch Ventil 26, Drossel 25 und Hochvakuumpumpe 15 (im Gegenstrom) zum Detektor 22 und wird registriert.After connecting a test object to inlet 2, the test object is pre-evacuated. In this phase, all valves - except valve 5 - are closed. The valve 26 can be opened after a short time (inlet pressure a few mbar, depending on the properties of the pump 15). If the test specimen has a gross leak, test gas passes through valve 26, throttle 25 and high vacuum pump 15 (in countercurrent) to detector 22 and is registered.
Der Übergang zur Feinlecksuche erfolgt dadurch, dass das Ventil 5 geschlossen und die Ventile 9 und 17 ge- öffnet werden. Dieser Schritt kann bereits zu dem Zeitpunkt getan werden, wenn der Einlassdruck etwa den Wert hat, der am Zwischeneintritt (14) nötig ist, um den dem Arbeitsdruck im Testgasdetektor (Massenspektrometer) gerade noch aufrecht zu erhalten. In diesem Zustand ist das Saugvermögen der Boosterpumpe 11 klein, bewirkt also keine schädliche Druckerhöhung am Zwischeneintritt. Außerdem ist in dieser Phase das Saugvermögen der Vorvakuumpumpe 8 noch größer als das Saugvermögen der Boosterpumpe 11. Weist der Prüfling kleinere Lecks auf, werden diese erkannt (Feinlecksuche) .The transition to fine leak detection takes place in that valve 5 is closed and valves 9 and 17 are closed. be opened. This step can be done at the point in time when the inlet pressure has approximately the value that is necessary at the intermediate inlet (14) in order to just maintain the working pressure in the test gas detector (mass spectrometer). In this state, the pumping speed of the booster pump 11 is small, so it does not cause a harmful pressure increase at the intermediate inlet. In addition, in this phase the pumping speed of the fore-vacuum pump 8 is even greater than the pumping speed of the booster pump 11. If the test object has minor leaks, these are recognized (fine leak detection).
Mit zunehmender Druckabnahme am Einlass 2 wird das Saugvermögen der Boosterpumpe 11 größer, der Prüfling wird relativ schnell auf niedrige Drücke evakuiert. Hat der Einlassdruck z.B. einen Wert von 10"2 mbar erreicht, beginnt die hochempfindliche Lecksuche dadurch, dass das Ventil 17 geschlossen wird. Durch ein gegebenenfalls noch vorhandenes, sehr kleines Leck im Prüfling austretendes Testgas tritt vollständig in den Zwischeneintritt 14 ein und wird vom Massenspektrometer 22 registriert.With increasing pressure decrease at the inlet 2, the pumping speed of the booster pump 11 increases, the test object is evacuated relatively quickly to low pressures. If, for example, the inlet pressure has reached a value of 10 "2 mbar, the highly sensitive leak detection begins by closing the valve 17. A test gas escaping from a test gas that may still be present and very small leaks completely into the intermediate inlet 14 and is measured by the mass spectrometer 22 registered.
Als Vorvakuumpumpe 8 können ölgedichtete oder trockene (ölfreie) Pumpen verwendet werden, zweckmäßig mit Saugvermögen > 16 m3h (d.h., relativ "große" Pumpen) wegen der relativ großen Volumina von Prüfling oder Testkammer. Die Drossel 25 bewirkt, dass die Empfindlichkeit für die Lecksuche, bestimmt durch K^ . S p (KTMP = Kompression der Lecksuchpumpe, SWp = Saugvermögen der Vorpumpe) , nicht zu klein wird, obwohl die Vorvakuumpumpe "groß" ist. Die Booster-Turbomolekularpumpe 11 sollte so gewählt werden, dass sie auch bei hohem Einlassdruck bereits ein nennenswertes Saugvermögen hat. Für die Lecksuchpumpe 15 gilt, dass sie im unteren Bereich eine relativ hohe Kompression hat, um die instabile Vorvakuumpumpe zu isolieren. So genannte Compoundpumpen, also Reibungspumpen mit einer saugseitig gelegenen Turbopumpstufe und einer druckseitig gelegenen Molekularpumpstufe, haben diese Eigenschaften.Oil-sealed or dry (oil-free) pumps can be used as the backing pump 8, expediently with a pumping speed> 16 m 3 h (ie, relatively "large" pumps) because of the relatively large volumes of the test specimen or test chamber. The throttle 25 causes the sensitivity for the leak detection, determined by K ^. S p (K TMP = compression of the leak detection pump, S W p = suction capacity of the backing pump) does not become too small, although the backing pump is "large". The booster turbomolecular pump 11 should be selected such that it already has a significant pumping speed even at high inlet pressure. It applies to the leak detection pump 15 that it has a relatively high compression in the lower region in order to isolate the unstable forevacuum pump. So-called compound pumps, i.e. friction pumps with a turbopump stage on the suction side and a molecular pump stage on the pressure side, have these properties.
Eine Ausführung nach der Figur kann besonders vorteilhaft mit einer drehzahlgeregelten Turbopumpe 11 am Einlaß 2 des Lecksuchers 1 realisiert werden. Während bei der Lösung mit ungeregelter Pumpendrehzahl die Leitung 16 mit dem Ventil 17 erforderlich ist, um den anfallenden erhöhten Gasstrom beim sogenannten "cross-over" (Ü- bergang zur Feinlecksuche, Öffnung des Ventils 9) zunächst in die Vorpumpe 8 abzuleiten, können Leitung 16 und Ventil 17 auch noch eingespart werden, wenn die Drehzahl der Booster-TMP 11 jeweils. so geregelt wird, dass der maximal zulässige Gasstrom nicht überschritten wird. Das heißt, dass die Bedingung, das Saugvermögen der Pumpe 11 zu Beginn des "cross-overs" nicht zu überschreiten, durch Drehzahlregelung erreicht wird.An embodiment according to the figure can be implemented particularly advantageously with a speed-controlled turbopump 11 at the inlet 2 of the leak detector 1. While in the solution with an unregulated pump speed the line 16 with the valve 17 is required in order to first discharge the increased gas flow in the so-called "cross-over" (transition to fine leak detection, opening of the valve 9) into the backing pump 8, line 16 and valve 17 can also be saved if the speed of the booster TMP 11 each. is regulated so that the maximum permissible gas flow is not exceeded. This means that the condition that the pumping speed of the pump 11 is not exceeded at the beginning of the "cross-over" is achieved by speed control.
Diese Möglichkeit besteht nur bei einer Boosterpumpe 11, die dem Einlaß 2 eines Gegenstromnachweissystems vorgeschaltet ist. Das Saugvermögen am Lecksucheinlaß 2 ist in diesem Fall (im Gegensatz zum Hauptstromlecksucher oder einfachen Gegenstromleeksucher) nicht mit dem empfindlichkeitsbestimmenden Saugvermögen der Hochvaku- um- oder VorVakuumpumpe gekoppelt. Der Leck-Gasstrom muß bei jedem Saugvermögen (jeder Drehzahl) komplett durch die Pumpe 11 fließen.This possibility only exists in the case of a booster pump 11 which is connected upstream of the inlet 2 of a counterflow detection system. In this case (in contrast to the main flow leak detector or simple counterflow leak detector), the pumping speed at the leak detection inlet 2 is not the same as the sensitivity-determining pumping speed of the high vacuum pump or pre-vacuum pump coupled. The leak gas flow must flow completely through the pump 11 at every pumping speed (every speed).
Typischerweise läuft die Boosterpumpe 11 mit einer niedrigen "Standby" -Drehzahl, solange das Einlaßventil 9 geschlossen ist. Sobald der Einlaßdruck den für den ventillosen Zwischeneinlaß 14 der Gegenstrompumpe zur lässigen Wert unterschritten hat, wird Ventil 5 geschlossen und Ventil 9 geöffnet. In diesem Moment muß das effektive Saugvermögen der Boosterpumpe 11 ungefähr gleich dem bis dahin vorhandenen Saugvermögen der Vor- . pumpe 8 sein, so dass kein Druckanstieg im Vorvakuum auftritt. Typically, the booster pump 11 runs at a low "standby" speed as long as the inlet valve 9 is closed. As soon as the inlet pressure has fallen below the casual value for the valve-less intermediate inlet 14 of the counterflow pump, valve 5 is closed and valve 9 is opened. At this moment, the effective pumping speed of the booster pump 11 must be approximately equal to the previous pumping speed. be pump 8 so that there is no pressure increase in the fore vacuum.
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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DE10156205 | 2001-11-15 | ||
DE10156205A DE10156205A1 (en) | 2001-11-15 | 2001-11-15 | Test gas leak detector |
PCT/EP2002/012601 WO2003042651A1 (en) | 2001-11-15 | 2002-11-12 | Test gas leakage detector |
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EP1444495A1 true EP1444495A1 (en) | 2004-08-11 |
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EP02787638A Withdrawn EP1444495A1 (en) | 2001-11-15 | 2002-11-12 | Test gas leakage detector |
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US (1) | US7082813B2 (en) |
EP (1) | EP1444495A1 (en) |
JP (1) | JP4164030B2 (en) |
DE (1) | DE10156205A1 (en) |
WO (1) | WO2003042651A1 (en) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10156205A1 (en) * | 2001-11-15 | 2003-06-05 | Inficon Gmbh | Test gas leak detector |
DE10302987A1 (en) * | 2003-01-25 | 2004-08-05 | Inficon Gmbh | Leak detector with an inlet |
EP1668253B1 (en) * | 2003-09-26 | 2008-05-07 | Edwards Limited | Detection of contaminants within fluid pumped by a vacuum pump |
US20070240493A1 (en) * | 2006-04-18 | 2007-10-18 | Shane Conlan | Sprayer-sniffer probe |
DE102006034735A1 (en) * | 2006-07-27 | 2008-01-31 | Inficon Gmbh | Leak Detector |
US7500381B2 (en) * | 2006-08-31 | 2009-03-10 | Varian, Inc. | Systems and methods for trace gas leak detection of large leaks at relatively high test pressures |
DE102007057944A1 (en) * | 2007-12-01 | 2009-06-04 | Inficon Gmbh | Method and device for leak testing |
US8230722B1 (en) | 2010-03-16 | 2012-07-31 | Sandia Corporation | Residual gas analysis device |
DE102011107334B4 (en) | 2011-07-14 | 2023-03-16 | Leybold Gmbh | Leak detection device and method for checking objects for leaks using a leak detection device |
DE102013218506A1 (en) * | 2013-09-16 | 2015-03-19 | Inficon Gmbh | Sniffer leak detector with multi-stage diaphragm pump |
DE102014223841A1 (en) * | 2014-11-21 | 2016-05-25 | Inficon Gmbh | Apparatus and method for countercurrent leak detection |
DE102016210701A1 (en) * | 2016-06-15 | 2017-12-21 | Inficon Gmbh | Mass spectrometric leak detector with turbomolecular pump and booster pump on common shaft |
CN107327324B (en) * | 2017-07-25 | 2023-03-14 | 航天推进技术研究院 | A leak detection method for an ORC generator set equipped with a leak detection device |
FR3070489B1 (en) * | 2017-08-29 | 2020-10-23 | Pfeiffer Vacuum | LEAK DETECTOR AND LEAK DETECTION PROCESS FOR THE TIGHTNESS CHECK OF OBJECTS TO BE TESTED |
FR3072774B1 (en) * | 2017-10-19 | 2019-11-15 | Pfeiffer Vacuum | LEAK DETECTOR FOR CONTROLLING THE SEALING OF AN OBJECT TO BE TESTED |
KR102016944B1 (en) * | 2018-04-24 | 2019-09-03 | 한국에너지기술연구원 | Apparatus and method for gas leakage measurement in a high pressure reactor |
GB2606392B (en) * | 2021-05-07 | 2024-02-14 | Edwards Ltd | A fluid routing for a vacuum pumping system |
Family Cites Families (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1648648C3 (en) * | 1967-04-12 | 1980-01-24 | Arthur Pfeiffer-Hochvakuumtechnik Gmbh, 6330 Wetzlar | Arrangement for leak detection according to the mass spectrometer principle |
US3690151A (en) * | 1968-07-25 | 1972-09-12 | Norton Co | Leak detector |
US4472962A (en) * | 1981-08-03 | 1984-09-25 | Balzers Aktiengesellschaft | Low pressure leak detector |
DE3144503C2 (en) * | 1981-11-09 | 1985-03-21 | Cit-Alcatel GmbH, 6980 Wertheim | Mass spectrometer leak detector |
DE3247975A1 (en) * | 1982-12-24 | 1984-06-28 | Balzers Hochvakuum Gmbh, 6200 Wiesbaden | Method and device for detecting leaks in walls |
US4499752A (en) * | 1983-06-22 | 1985-02-19 | Varian Associates, Inc. | Counterflow leak detector with cold trap |
FR2604522B1 (en) * | 1986-09-26 | 1989-06-16 | Cit Alcatel | PLOTTERY GAS LEAK DETECTION SYSTEM AND METHOD OF USE |
EP0283543B1 (en) * | 1987-03-27 | 1991-12-11 | Leybold Aktiengesellschaft | Leak-detecting apparatus and its operating method |
US4845360A (en) * | 1987-12-10 | 1989-07-04 | Varian Associates, Inc. | Counterflow leak detector with high and low sensitivity operating modes |
DE3865012D1 (en) * | 1988-06-01 | 1991-10-24 | Leybold Ag | PUMP SYSTEM FOR A LEAK DETECTOR. |
DE3828588C1 (en) * | 1988-08-23 | 1989-12-07 | Alcatel Hochvakuumtechnik Gmbh, 6980 Wertheim, De | |
US5049168A (en) * | 1988-09-12 | 1991-09-17 | Philip Danielson | Helium leak detection method and system |
US4893497A (en) * | 1988-09-12 | 1990-01-16 | Philip Danielson | Leak detection system |
DE3831258C1 (en) * | 1988-09-14 | 1989-10-12 | Alcatel Hochvakuumtechnik Gmbh, 6980 Wertheim, De | |
US5010761A (en) * | 1990-03-01 | 1991-04-30 | Superior Industries International, Inc. | Automated leak detection apparatus and method therefor |
FR2666410B1 (en) | 1990-09-05 | 1993-10-08 | Alcatel Cit | HIGH FLOW LEAK DETECTOR WITH THREE MOLECULAR FILTERS. |
FR2681688B1 (en) * | 1991-09-24 | 1993-11-19 | Alcatel Cit | GAS LEAK DETECTION INSTALLATION USING THE SNiffle technique. |
FR2681689B1 (en) * | 1991-09-25 | 1993-11-12 | Alcatel Cit | GAS LEAK DETECTOR. |
DE4140366A1 (en) * | 1991-12-07 | 1993-06-09 | Leybold Ag, 6450 Hanau, De | LEAK DETECTOR FOR VACUUM SYSTEMS AND METHOD FOR CARRYING OUT THE LEAK DETECTOR ON VACUUM SYSTEMS |
DE4228313A1 (en) * | 1992-08-26 | 1994-03-03 | Leybold Ag | Counterflow leak detector with high vacuum pump |
DE4408877A1 (en) * | 1994-03-16 | 1995-09-21 | Leybold Ag | Test gas leak detector |
JP2655315B2 (en) * | 1994-06-29 | 1997-09-17 | 日本真空技術株式会社 | Leak detection device using compound molecular pump |
DE4442174A1 (en) * | 1994-11-26 | 1996-05-30 | Leybold Ag | Leak detector with vacuum pumps and operating procedures |
FR2728072B1 (en) * | 1994-12-07 | 1997-01-10 | Cit Alcatel | LEAK DETECTOR |
DE4445829A1 (en) * | 1994-12-22 | 1996-06-27 | Leybold Ag | Countercurrent sniffing leak detector |
ES2192568T3 (en) * | 1994-12-23 | 2003-10-16 | Unaxis Balzers Ag | PROCEDURE FOR THE GAS ANALYSIS AND GAS ANALYZER. |
DE19504278A1 (en) * | 1995-02-09 | 1996-08-14 | Leybold Ag | Test gas leak detector |
DE19522466A1 (en) * | 1995-06-21 | 1997-01-02 | Leybold Ag | Leak detector with backing pump |
DE19638506A1 (en) * | 1996-09-20 | 1998-03-26 | Leybold Vakuum Gmbh | Procedure for examining a plurality of similar test objects for leaks and leak detectors suitable for carrying out this procedure |
DE19735250A1 (en) * | 1997-08-14 | 1999-02-18 | Leybold Vakuum Gmbh | Method to operate helium leak detector |
DE10156205A1 (en) * | 2001-11-15 | 2003-06-05 | Inficon Gmbh | Test gas leak detector |
-
2001
- 2001-11-15 DE DE10156205A patent/DE10156205A1/en not_active Withdrawn
-
2002
- 2002-11-12 US US10/496,718 patent/US7082813B2/en not_active Expired - Fee Related
- 2002-11-12 WO PCT/EP2002/012601 patent/WO2003042651A1/en active Application Filing
- 2002-11-12 EP EP02787638A patent/EP1444495A1/en not_active Withdrawn
- 2002-11-12 JP JP2003544435A patent/JP4164030B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO03042651A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2003042651A1 (en) | 2003-05-22 |
DE10156205A1 (en) | 2003-06-05 |
JP4164030B2 (en) | 2008-10-08 |
US20050066708A1 (en) | 2005-03-31 |
JP2006515666A (en) | 2006-06-01 |
US7082813B2 (en) | 2006-08-01 |
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