DE202004018733U1 - pump - Google Patents
pump Download PDFInfo
- Publication number
- DE202004018733U1 DE202004018733U1 DE202004018733U DE202004018733U DE202004018733U1 DE 202004018733 U1 DE202004018733 U1 DE 202004018733U1 DE 202004018733 U DE202004018733 U DE 202004018733U DE 202004018733 U DE202004018733 U DE 202004018733U DE 202004018733 U1 DE202004018733 U1 DE 202004018733U1
- Authority
- DE
- Germany
- Prior art keywords
- flow resistance
- pump according
- medium
- pump
- pressure
- 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.)
- Expired - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/10—Outer members for co-operation with rotary pistons; Casings
- F01C21/104—Stators; Members defining the outer boundaries of the working chamber
- F01C21/108—Stators; Members defining the outer boundaries of the working chamber with an axial surface, e.g. side plates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/082—Details specially related to intermeshing engagement type pumps
- F04C18/086—Carter
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/126—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/123—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially or approximately radially from the rotor body extending tooth-like elements, co-operating with recesses in the other rotor, e.g. one tooth
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2220/00—Application
- F04C2220/10—Vacuum
- F04C2220/12—Dry running
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Examining Or Testing Airtightness (AREA)
- Non-Positive Displacement Air Blowers (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Pumpe mit einem bestrichenen Pumpenvolumen, einer das bestrichene Pumpenvolumen umgebenden abgedichteten Kammer, einer Leitung zum Zuführen eines Mediums in die Kammer, einem in der Leitung angeordneten Strömungswiderstand zum Begrenzen des Strömungsdurchsatzes des Mediums in die Kammer, und Mitteln zum Bestimmen der Druckdifferenz über dem Strömungswiderstand.pump with a swept pump volume, the swept pump volume surrounding sealed chamber, a conduit for supplying a Medium in the chamber, a flow resistance arranged in the line for limiting the flow rate the medium into the chamber, and means for determining the pressure difference across the Flow resistance.
Description
Die Erfindung betrifft eine Pumpe.The The invention relates to a pump.
Es sind Vakuumpumpen bekannt, die in ihren Vakuumkammern ölfrei sind und die daher in sauberen Umgebungen brauchbar sind, wie man sie in der Halbleiterfertigungsindustrie findet. In einer solchen Umgebung könnten, wenn Schmiermittel in der Vakuumkammer vorhanden wären, diese möglicherweise zurück in die Halbleiterprozesskammer wandern und dabei eine Kontaminierung des in der Fertigung befindlichen Produkts verursachen. Solche "trockenen" Vakuumpumpen sind üblicherweise mehrstufige Verdrängerpumpen mit ineinandergreifenden Rotoren in der Vakuumkammer jede Stufe der Pumpe. Die Rotoren können in jeder Kammer den gleichen Profiltyp haben, oder das Profil kann von Kammer zu Kammer wechseln.It Vacuum pumps are known which are oil-free in their vacuum chambers and therefore useful in clean environments, as they are in the semiconductor manufacturing industry. In such an environment could if there were lubricants in the vacuum chamber, these possibly back in the Semiconductor process chamber and thereby a contamination of the cause in the production of product. Such "dry" vacuum pumps are common multi-stage positive displacement pumps with interlocking rotors in the vacuum chamber each stage the pump. The rotors can in each chamber have the same profile type, or the profile can change from chamber to chamber.
Bei Pumpen der Roots-, Schrauben- oder Northey- bzw. Klauenbauart ist jede Kammer typischerweise durch zwei getrennt gefertigte Statorkomponenten der Pumpe gebildet, wobei Rotorkomponenten der Pumpe in dem zwischen den Statorkomponenten gebildeten Hohlraum angeordnet sind. Es ist notwendig, eine Dichtung zwischen den Statorkomponenten vorzusehen, um eine Leckage von gepumpten Prozessgas aus dem Hohlraum zu vermeiden sowie auch den Eintritt von Umgebungsluft in den Hohlraum zu vermeiden. Typischerweise ist eine O-Ringdichtung vorgesehen, um diese Dichtfunktion wahrzunehmen. Solche Dichtungen bestehen typischerweise aus Fluorelastomeren wie beispielsweise Viton.at Roots, screw or Northey or claw type pumps each chamber typically by two separately manufactured stator components formed of the pump, wherein rotor components of the pump in the between The cavity formed stator are arranged. It is necessary to provide a seal between the stator components, to prevent leakage of pumped process gas from the cavity as well as to avoid the entry of ambient air into the cavity. Typically, an O-ring seal is provided to perform this sealing function. Such seals typically consist of fluoroelastomers such as for example, Viton.
Trockene Vakuumpumpen werden häufig in Anwendungen eingesetzt, wo sie beträchtliche Mengen korrosiver Medien, insbesondere Halogengase und Lösungsmittel, pumpen müssen. Solche Materialien greifen O-Ringdichtungen an, mit dem Ergebnis, daß diese Dichtungen übermäßig weich oder sehr brüchig werden, was die Integrität der Dichtung zwischen den Statorkomponenten übel beeinträchtigen kann.dry Vacuum pumps become common used in applications where they produce significant amounts of corrosive Media, in particular halogen gases and solvents must pump. Such Materials attack O-ring seals, with the result that these Seals overly soft or very brittle be what integrity The seal between the stator components can affect bad.
Die Intensität des Angriffs auf die Dichtung hängt von einer Reihe von Variablen ab, einschließlich beispielsweise der Art des gepumpten Mediums, dem Material, aus welchem die O-Ringdichtung gebildet ist, und die Temperatur der Pumpe. Im Hinblick darauf ist es sehr schwierig, das richtige Intervall zum Ersatz der Dichtungen und daher zur Aufrechterhaltung der Pumpenintegrität vorauszusagen. Eine externe Inspektion der Dichtungen ist selten praktikabel.The intensity the attack on the seal hangs from a number of variables, including, for example, the species of the pumped medium, the material from which the o-ring seal is formed, and the temperature of the pump. In view of this is It is very difficult to find the right interval to replace the seals and therefore predict the maintenance of pump integrity. External inspection of the seals is rarely practicable.
Diese Probleme sind besonders akut, wenn reaktive Gase wie beispielsweise Fluor aus Halbleiterprozessanlagen gepumpt werden, wo die Gaszusammensetzungen sich durch Reaktionen in der Anlage ändern. Hier erlaubt selbst eine präzise Kenntnis hinsichtlich der zur Prozesskammer zugeführten Gasströme nur eine sehr schwache Voraussage der Menge oder Art des reaktiven Gases, das in die Pumpe eintritt, und daher der voraussichtlichen Standzeit der Dichtung. Die empfohlene Wartung umfasst oftmals häufige Leckprüfungen der Dichtung, jedoch ist dies teuer, unzweckmäßig auszuführen und wird deshalb manchmal einfach weggelassen.These Problems are particularly acute when reactive gases such as Fluorine is pumped out of semiconductor process equipment where the gas compositions to change by reactions in the plant. Here allowed itself a precise one Knowledge of the supplied to the process chamber gas flows only one very weak prediction of the amount or type of reactive gas, entering the pump, and therefore the expected service life of Poetry. The recommended maintenance often includes frequent leak tests of the Seal, however, this is expensive, impractical to perform and therefore sometimes just omitted.
Im Prinzip könnten andere Fühlerarten eingesetzt werden, um die Messung des integrierten Aussetzungsgrads der Dichtungen und folglich des Zustands der Dichtungen zu versuchen. Beispielsweise könnte eine spektroskopische oder chemische Technik angewendet werden, um die Gaszusammensetzung zu messen. Jedoch würden solche Techniken komplexe Eichverfahren erfordern und wären daher kostspielig in der Umsetzung.in the Principle could other types of sensors used to measure the integrated exposure level to try the seals and thus the condition of the seals. For example, could a spectroscopic or chemical technique can be applied to measure the gas composition. However, such techniques would be complex Require and would require calibration procedures therefore costly in the implementation.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, diese und weitere Probleme zu lösen.Of the present invention is based on the object, these and others To solve problems.
Die vorliegende Erfindung umfasst eine Pumpe mit einem gestrichenen Pumpenvolumen, einer abgedichteten Kammer, die das bestrittene Volumen umschließt, einer Leitung zum Zuführen von Medium in die Kammer, die einen Strömungswiderstand zur Begrenzung des Strömungsdurchsatzes des Mediums in die Kammer enthält, und Mittel zur Bestimmung einer Druckdifferenz über dem Strömungswiderstand.The The present invention includes a pump with a painted one Pump volume, a sealed chamber containing the denested volume encloses a conduit for feeding from medium into the chamber, which limits flow resistance the flow rate contains the medium in the chamber, and means for determining a pressure difference across the flow resistance.
Bevorzugte Merkmale der Erfindung werden nun lediglich beispielshalber unter Bezugnahme auf die anliegenden Zeichnungen beschrieben, in denen zeigt:preferred Features of the invention will now be given by way of example only With reference to the accompanying drawings, in which:
Eine
erste O-Ringdichtung
Wie
in
Der
Strömungswiderstand
Das
Einwegventil
Die
Druckwandler
Die
Gaszufuhr zur Leitung
Im
Betrieb wird druckbeaufschlagtes Gas (typischerweise mit etwa 6
Psi) entlang der Leitung
Die oben beschriebene Einrichtung kann daher eine zuverlässige Anzeige eines kritischen Zustands innerhalb einer Pumpe liefern. Eine solche Anzeige kann die Verlängerung von Wartungsintervallen und die Reduzierung von Betriebskosten ohne innere Untersuchung der Pumpe ermöglichen. Da die Vorhersagbarkeit einer Verschlechterung dieser kritischen Komponenten, nämlich der Dichtungen, dadurch stark verbessert werden kann, ist die Wahrscheinlichkeit möglicherweise gefährlicher Lecks verringert.The The device described above can therefore provide a reliable indication of a critical condition within a pump. Such an ad can the extension of maintenance intervals and the reduction of operating costs without internal Allow examination of the pump. Because the predictability of a deterioration of this critical Components, namely The gaskets, which can be greatly improved, is the probability possibly dangerous Leakage reduced.
Die Erfindung kann also dahingehend zusammengefasst werden, daß eine Leitung eine Gasströmung in eine abgeschlossene Kammer zuführt, die das gestrichene Volumen einer Pumpe umschließt. Die Leitung enthält einen Strömungswiderstand zur Begrenzung des Strömungsdurchsatzes des Gases in die abgeschlossene Kammer. Ausgangssignale von Druckwandlern auf beiden Seiten des Strömungswiderstands dienen zum Nachweis einer Leckage von Gas aus der abgedichteten Kammer in das bestrichene Pumpenvolumen, was den Zustand der das bestrichene Pumpenvolumen umgebenden Dichtung anzeigt.The Thus, the invention can be summarized to the effect that a line a gas flow in a closed chamber that supplies the painted volume encloses a pump. The line contains a flow resistance for limiting the flow rate of the Gas in the closed chamber. Output signals from pressure transducers on both sides of the flow resistance serve to detect leakage of gas from the sealed Chamber in the swept pump volume, reflecting the state of the indicates coated pump volume surrounding gasket.
Claims (12)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB03279643 | 2003-12-03 | ||
GB0327964A GB2408801A (en) | 2003-12-03 | 2003-12-03 | Detection of seal leak using differential pressure measurement |
Publications (1)
Publication Number | Publication Date |
---|---|
DE202004018733U1 true DE202004018733U1 (en) | 2005-04-14 |
Family
ID=29764459
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE202004018733U Expired - Lifetime DE202004018733U1 (en) | 2003-12-03 | 2004-12-03 | pump |
Country Status (7)
Country | Link |
---|---|
US (1) | US20050123414A1 (en) |
JP (1) | JP3109161U (en) |
CN (1) | CN2844879Y (en) |
DE (1) | DE202004018733U1 (en) |
FR (1) | FR2863322B3 (en) |
GB (1) | GB2408801A (en) |
TW (1) | TWM278782U (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008021971A1 (en) * | 2008-05-02 | 2009-11-05 | Oerlikon Leybold Vacuum Gmbh | Vacuum pump and method for cleaning vacuum pumps |
WO2013127464A1 (en) * | 2012-03-02 | 2013-09-06 | Maag Pump Systems Ag | Sealing arrangement, a conveying device having a sealing arrangement and a method for operating the sealing arrangement |
EP2801725A3 (en) * | 2013-05-10 | 2015-01-14 | Pfeiffer Vacuum Gmbh | Device with at least one channel for guiding a gaseous or liquid working medium |
EP2871363A1 (en) | 2013-11-06 | 2015-05-13 | Dover Pump Solutions Group (Europe) GmbH | Sealing assembly, a conveyor with a sealing assembly, and a method for operating said sealing assembly |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI438342B (en) * | 2006-07-28 | 2014-05-21 | Lot Vacuum Co Ltd | Complex dry vacuum pump having root and screw rotors |
GB2442738B (en) * | 2006-10-09 | 2011-08-03 | Boc Group Plc | A sealing system |
GB0712779D0 (en) * | 2007-07-02 | 2007-08-08 | Edwards Ltd | Seal |
CA2830015A1 (en) * | 2011-03-15 | 2012-09-20 | Carclo Technical Plastics Limited | Capillary fluid flow control |
WO2012142402A1 (en) * | 2011-04-14 | 2012-10-18 | Cincinnati Test Systems, Inc. | Leak testing device and method |
CN102606465B (en) * | 2012-03-06 | 2015-01-07 | 昆山佳铭自动化科技有限公司 | Device for detecting comprehensive performances of electronic vacuum pumps |
CN102865219B (en) * | 2012-10-09 | 2014-11-12 | 浙江宇宙智能设备有限公司 | Direct-drive high-pressure pumping seal internal-leakage online monitoring method |
CN103422899B (en) * | 2013-08-09 | 2015-06-03 | 华南理工大学 | Process and device for generating power by pressure energy of small natural gas pipeline network |
JP6418838B2 (en) | 2014-07-31 | 2018-11-07 | エドワーズ株式会社 | Dry pump and exhaust gas treatment method |
FR3107575B1 (en) * | 2020-02-20 | 2022-03-25 | Pfeiffer Vacuum Technology AG | Dry vacuum pump |
CN114593059A (en) * | 2020-12-07 | 2022-06-07 | 中国科学院沈阳科学仪器股份有限公司 | Stator component of dry vacuum pump |
Family Cites Families (18)
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US3818752A (en) * | 1971-04-28 | 1974-06-25 | N Lindeberg | Method and apparatus for testing tightness |
GB2143596B (en) * | 1983-07-19 | 1986-07-02 | Telspec Ltd | Improvements in and relating to the sealing of electrical cable joints equipment housings or the like |
FR2638788B1 (en) * | 1988-11-07 | 1994-01-28 | Alcatel Cit | MULTI-STAGE ROOTS TYPE VACUUM PUMP |
FR2666440B1 (en) * | 1990-08-28 | 1992-12-11 | Framatome Sa | METHOD FOR CONTROLLING THE PLACEMENT OF A TRANSPORTABLE ELEMENT AND THE SEALING OF THE CONNECTION WITH A FIXED STRUCTURE AND USE OF THIS METHOD. |
JP3236939B2 (en) * | 1993-05-06 | 2001-12-10 | ストラクチュラル モニタリング システムズ リミテッド | Monitor device |
GB9403184D0 (en) * | 1994-02-18 | 1994-04-06 | Boc Group Plc | Methods and apparatus for leak testing |
EP0786655B1 (en) * | 1997-05-07 | 2002-07-24 | Martin Lehmann | Procedure for leak testing of closed containers, test chamber, device and installation therefor |
US6092370A (en) * | 1997-09-16 | 2000-07-25 | Flow International Corporation | Apparatus and method for diagnosing the status of specific components in high-pressure fluid pumps |
JPH11230352A (en) * | 1998-02-10 | 1999-08-27 | Nec Corp | Sealed container and testing method thereof |
US6123526A (en) * | 1998-09-18 | 2000-09-26 | Industrial Technology Research Institute | Multistage pump and method for assembling the pump |
US6301319B1 (en) * | 1998-09-30 | 2001-10-09 | Westinghouse Electric Company Llc | Method of sealing a reactor pressure vessel |
AUPQ726600A0 (en) * | 2000-05-03 | 2000-05-25 | Structural Monitoring Systems Ltd | System and method for continuous monitoring of the structural integrity of a component or structure |
AUPQ823500A0 (en) * | 2000-06-19 | 2000-07-13 | Structural Monitoring Systems Ltd | Apparatus for condition monitoring the integrity of fasteners and fastened joints |
AUPR001800A0 (en) * | 2000-09-08 | 2000-10-05 | Structural Monitoring Systems Ltd | Method and apparatus for monitoring the integrity of structures |
FR2813104B1 (en) * | 2000-08-21 | 2002-11-29 | Cit Alcatel | SEAL FOR VACUUM PUMP |
US7241115B2 (en) * | 2002-03-01 | 2007-07-10 | Waters Investments Limited | Methods and apparatus for determining the presence or absence of a fluid leak |
US6817228B2 (en) * | 2002-04-01 | 2004-11-16 | Schlumberger Technology Corporation | Method and apparatus for detecting seal failure |
GB0310615D0 (en) * | 2003-05-08 | 2003-06-11 | Boc Group Plc | Improvements in seal assemblies |
-
2003
- 2003-12-03 GB GB0327964A patent/GB2408801A/en not_active Withdrawn
-
2004
- 2004-11-26 FR FR0412552A patent/FR2863322B3/en not_active Expired - Lifetime
- 2004-12-02 JP JP2004007099U patent/JP3109161U/en not_active Expired - Lifetime
- 2004-12-03 US US11/004,259 patent/US20050123414A1/en not_active Abandoned
- 2004-12-03 TW TW093219592U patent/TWM278782U/en not_active IP Right Cessation
- 2004-12-03 DE DE202004018733U patent/DE202004018733U1/en not_active Expired - Lifetime
- 2004-12-03 CN CNU2004201174498U patent/CN2844879Y/en not_active Expired - Lifetime
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008021971A1 (en) * | 2008-05-02 | 2009-11-05 | Oerlikon Leybold Vacuum Gmbh | Vacuum pump and method for cleaning vacuum pumps |
WO2013127464A1 (en) * | 2012-03-02 | 2013-09-06 | Maag Pump Systems Ag | Sealing arrangement, a conveying device having a sealing arrangement and a method for operating the sealing arrangement |
CN104246131A (en) * | 2012-03-02 | 2014-12-24 | 多佛泵解决方案集团(欧洲)有限公司 | Sealing arrangement, a conveying device having a sealing arrangement and a method for operating the sealing arrangement |
CN104246131B (en) * | 2012-03-02 | 2018-07-10 | 多佛泵解决方案集团(欧洲)有限公司 | The operating method of sealing structure, the conveying device with sealing structure and sealing structure |
US10036385B2 (en) | 2012-03-02 | 2018-07-31 | Dover Pump Solutions Group (Europe) Gmbh | Sealing arrangement, a conveying device having a sealing arrangement and a method for operating the sealing arrangement |
EP2801725A3 (en) * | 2013-05-10 | 2015-01-14 | Pfeiffer Vacuum Gmbh | Device with at least one channel for guiding a gaseous or liquid working medium |
EP2871363A1 (en) | 2013-11-06 | 2015-05-13 | Dover Pump Solutions Group (Europe) GmbH | Sealing assembly, a conveyor with a sealing assembly, and a method for operating said sealing assembly |
Also Published As
Publication number | Publication date |
---|---|
US20050123414A1 (en) | 2005-06-09 |
JP3109161U (en) | 2005-05-12 |
FR2863322B3 (en) | 2005-12-02 |
GB0327964D0 (en) | 2004-01-07 |
TWM278782U (en) | 2005-10-21 |
GB2408801A (en) | 2005-06-08 |
FR2863322A3 (en) | 2005-06-10 |
CN2844879Y (en) | 2006-12-06 |
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Legal Events
Date | Code | Title | Description |
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R207 | Utility model specification |
Effective date: 20050519 |
|
R081 | Change of applicant/patentee |
Owner name: EDWARDS LTD., GB Free format text: FORMER OWNER: THE BOC GROUP PLC., WINDLESHAM, GB Effective date: 20080102 |
|
R150 | Utility model maintained after payment of first maintenance fee after three years |
Effective date: 20080220 |
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R151 | Utility model maintained after payment of second maintenance fee after six years |
Effective date: 20110118 |
|
R152 | Utility model maintained after payment of third maintenance fee after eight years |
Effective date: 20130131 |
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R071 | Expiry of right | ||
R071 | Expiry of right | ||
R082 | Change of representative |
Representative=s name: FLEUCHAUS & GALLO PARTNERSCHAFT MBB PATENTANWA, DE |