EP0918938B1 - Friction vacuum pump - Google Patents
Friction vacuum pump Download PDFInfo
- Publication number
- EP0918938B1 EP0918938B1 EP97931744A EP97931744A EP0918938B1 EP 0918938 B1 EP0918938 B1 EP 0918938B1 EP 97931744 A EP97931744 A EP 97931744A EP 97931744 A EP97931744 A EP 97931744A EP 0918938 B1 EP0918938 B1 EP 0918938B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stage
- pump
- thread
- blades
- pump stage
- 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
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Classifications
-
- 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
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/005—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of dissimilar working principle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D19/00—Axial-flow pumps
- F04D19/02—Multi-stage pumps
- F04D19/04—Multi-stage pumps specially adapted to the production of a high vacuum, e.g. molecular pumps
- F04D19/042—Turbomolecular vacuum pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D19/00—Axial-flow pumps
- F04D19/02—Multi-stage pumps
- F04D19/04—Multi-stage pumps specially adapted to the production of a high vacuum, e.g. molecular pumps
- F04D19/044—Holweck-type pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D19/00—Axial-flow pumps
- F04D19/02—Multi-stage pumps
- F04D19/04—Multi-stage pumps specially adapted to the production of a high vacuum, e.g. molecular pumps
- F04D19/046—Combinations of two or more different types of pumps
Definitions
- the invention relates to a friction vacuum pump with at least one turbomolecular pump stage and one adjoining the pressure pump stage on the pressure side.
- turbomolecular vacuum pumps can be improved that their turbomolecular pump stages are a threaded pump stage is subordinated.
- the problem of an effective one Use of the thread pump stage is that a Effective pumping speed dependent on pressure as possible on Entry of the thread (suction-side end of the thread) cannot be guaranteed.
- the reason is in that the flow behavior of the funded Gases in the transition area between turbomolecular pump stages and thread pump stages from molecular (at Drükken ⁇ 10-3 mbar) on laminar (from about 10-2 mbar upwards) changes.
- Known designs of the transition area between turbomolecular pump stages and thread pump stages have the disadvantage that it can be demolished Current is coming. These have a significant impact the pumping speed of the pump.
- DE-A-36 27 642 (claim 4) is a friction vacuum pump of the species affected here.
- a thread pump stage closes on.
- the entry of the thread pump stage has one special design not on.
- the thread depth changes not over the length of the thread pump stage.
- the state of the art also includes the content of Documents FR-A-26 629 877 and WO-A-93/23672.
- the subject of the first-mentioned script takes length the wing of the filling stage in the direction of flow.
- at the turbomolecular vacuum pump according to the second document is the suction or pressure side length of the wing Filling level of the corresponding length of the blades upstream and downstream Turbomolecular pump stage adjusted.
- the present invention is based on the object the pumping speed of a friction vacuum pump at the beginning mentioned type by an improvement in the entrance area to increase the thread pump stage.
- the measures according to the invention have the effect that the transition area between the turbomolecular pump stage and the thread pump stage one of the flow form has adapted geometry.
- the in this transition area from molecular to laminar flow is only slightly disturbed.
- the properties of the fill level are the mass flow, the realized compression and adapted to the absolute pressure.
- Figures 1 and 2 show that the invention Pump 1 a turbomolecular pump stage 2, a filling stage 3 and a thread pump stage 4 comprises. Gas production takes place between a rotor 5 (rotor sections 5a and 5b) and a stator 6 instead.
- the axis of rotation of the rotor is denoted by 7.
- Wear rotor 5 and / or stator 6 the structures that produce gas.
- Components of the turbomolecular pump stage 2 are rows of stator blades 11 and rows of rotor blades 12.
- the Filling stage 3 comprises several vanes 13.
- the thread pump stage 4 is characterized by a thread 14.
- a wing 13 does not have to be assigned to each web of the thread 14 his. Depending on the application, less or more wings 13 than thread webs 14 may be present.
- the gap is between the rotor 5 and the stator 6 15, which should be as small as possible and usually is less than a millimeter.
- FIG. 3 shows how the Wing 13 are designed. It is this Execution around wing-shaped end sections of the Thread 14, practically by a sharp increase in Thread depth t are marked. This increase begins at the dashed line 16 and extends over a relatively short length, denoted by h of the rotor 5.
- the thread depth t increases towards the suction side Amount that is about the active length of the blades of the Stator blade row 11 or rotor blade row located on the suction side 12 corresponds to the turbomolecular pump stage 2.
- This strong increase in the thread depth t takes place expediently over a length h of the rotor 5, which is smaller than the length of the suction side Blading the turbomolecular pump stage 2, preferably even less than half the length 1 of these blades.
- the thread depth t increases by Factor 4 to 8, preferably about 6 to.
- the angle of attack the wing 13 lies between the angle of attack the neighboring blades of the turbomolecular pump stage 2 and the inclination of the adjacent thread webs 14 (Web angle ⁇ ).
- Figures 4 to 6 show that the thread pump stage 4 has several thread webs 14, e.g. between four and sixteen, preferably eight.
- the bridge angle ⁇ (to the horizontal) is between about 10 ° and 20 °.
- blades 12 are the last ones on the pressure side blade row of the turbomolecular pump stage 2 shown, which - as described in Figures 1 to 3 - Still on the rotor section 5b of the filling stage 3 and Thread stage 4 are attached.
- the number of blades 12 exceeds the number of wings 13 by about a factor 1.5 to 5, preferably 4.
- the Number of wings 13 greater than the number of Threaded webs 14. Between each suction side according to Art a wing-shaped end portion 13 of the Threaded webs 14 have another wing 13.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Non-Positive Displacement Air Blowers (AREA)
Description
Die Erfindung bezieht sich auf eine Reibungsvakuumpumpe mit mindestens einer Turbomolekularpumpenstufe und einer sich daran druckseitig anschließenden Gewindepumpenstufe.The invention relates to a friction vacuum pump with at least one turbomolecular pump stage and one adjoining the pressure pump stage on the pressure side.
Es ist bekannt, daß die Vorvakuumbeständigkeit von Turbomolekularvakuumpumpen dadurch verbessert werden kann, daß ihren Turbomolekularpumpenstufen eine Gewindepumpenstufe nachgeordnet wird. Das Problem einer effektiven Nutzung der Gewindepumpenstufe besteht darin, daß ein möglichst druckungabhängiges effektives Saugvermögen am Eintritt des Gewindes (saugseitiges Ende des Gewindes) nicht sichergestellt werden kann. Der Grund dafür liegt darin, daß sich das Strömungsverhalten der geförderten Gase im Übergangsbereich zwischen Turbomolekularpumpenstufen und Gewindepumpenstufen von molekular (bei Drükken < 10-3 mbar) auf laminar (von etwa 10-2 mbar aufwärts) ändert. Bekannte Gestaltungen des Übergangsbereichs zwischen Turbomolekularpumpenstufen und Gewindepumpenstufen haben den Nachteil, daß es zu Abrissen der Strömung kommt. Diese beeinträchtigen in erheblichem Maße das Saugvermögen der Pumpe.It is known that the backing resistance of turbomolecular vacuum pumps can be improved that their turbomolecular pump stages are a threaded pump stage is subordinated. The problem of an effective one Use of the thread pump stage is that a Effective pumping speed dependent on pressure as possible on Entry of the thread (suction-side end of the thread) cannot be guaranteed. The reason is in that the flow behavior of the funded Gases in the transition area between turbomolecular pump stages and thread pump stages from molecular (at Drükken <10-3 mbar) on laminar (from about 10-2 mbar upwards) changes. Known designs of the transition area between turbomolecular pump stages and thread pump stages have the disadvantage that it can be demolished Current is coming. These have a significant impact the pumping speed of the pump.
Aus der DE-A-36 27 642 (Anspruch 4) ist eine Reibungsvakuumpumpe der hier betroffenen Art bekannt. An die Turbomolekularpumpenstufe schließt sich eine Gewindepumpenstufe an. Der Eintritt der Gewindepumpenstufe weist eine besondere Gestaltung nicht auf. Die Gewindetiefe ändert sich über die Länge der Gewindepumpenstufe nicht.DE-A-36 27 642 (claim 4) is a friction vacuum pump of the species affected here. To the turbomolecular pump stage a thread pump stage closes on. The entry of the thread pump stage has one special design not on. The thread depth changes not over the length of the thread pump stage.
Zum Stand der Technik gehört auch noch der Inhalt der Dokumente FR-A-26 629 877 und WO-A-93/23672. Beim Gegenstand der zuerst genannten Schrift nimmt die Länge der Flügel der Füllstufe in Strömungsrichtung ab. Bei der Turbomolekularvakuumpumpe nach dem zweiten Dokument ist die saug- bzw. druckseitige Länge der Flügel der Füllstufe der entsprechenden Länge der Schaufeln einer vor- und einer nachgeschalteten Turbomolekularpumpenstufe angepasst.The state of the art also includes the content of Documents FR-A-26 629 877 and WO-A-93/23672. At the The subject of the first-mentioned script takes length the wing of the filling stage in the direction of flow. at the turbomolecular vacuum pump according to the second document is the suction or pressure side length of the wing Filling level of the corresponding length of the blades upstream and downstream Turbomolecular pump stage adjusted.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, das Saugvermögen einer Reibungsvakuumpumpe der eingangs genannten Art durch eine Verbesserung im Eintrittsbereich der Gewindepumpenstufe zu erhöhen.The present invention is based on the object the pumping speed of a friction vacuum pump at the beginning mentioned type by an improvement in the entrance area to increase the thread pump stage.
Erfindungsgemäß wird diese Aufgabe durch die kennzeichnenden Merkmale der Patentansprüche gelöst.According to the invention, this object is achieved by the characterizing Features of the claims solved.
Die Maßnahmen nach der Erfindung haben die Wirkung, daß der Übergangsbereich zwischen der Turbomolekularpumpenstufe und der Gewindepumpenstufe eine der Strömungsform angepasste Geometrie hat. Die in diesem Übergangsbereich von molekular auf laminar übergehende Stömung wird nur unwesentlich gestört. Zu einem Abriss der Strömung kommt es nicht. Die Eigenschaften der Füllstufe sind dem Massenfluß, der realisierten Verdichtung und dem Absolutdruck angepaßt.The measures according to the invention have the effect that the transition area between the turbomolecular pump stage and the thread pump stage one of the flow form has adapted geometry. The in this transition area from molecular to laminar flow is only slightly disturbed. To a demolition of the There is no current. The properties of the fill level are the mass flow, the realized compression and adapted to the absolute pressure.
Bei einer vorteilhaften Ausführungsform sind mehrere oder alle Flügel der Füllstufe flügelartig gestaltete Endabschnitte der Stege der Gewindestufe. Die Herstellung von Füllstufe und Gewindestufe ist dadurch vereinfacht. In an advantageous embodiment, there are several or designed all wings of the filling level wing-like End sections of the webs of the threaded step. The production filling level and thread level is simplified.
Weitere Vorteile und Einzelheiten der Erfindung sollen anhand von in den Figuren 1 bis 6 dargestellten Ausführungsbeispielen erläutert werden. Es zeigen:
Figuren 1 und 2 Teilschnitte durch eine Pumpe nach der Erfindung mit insgesamt vier Gestaltungsvarianten von Gewindepumpenstufe und Füllstufe.Figur 3 vergrößert die Variante nachFigur 1, rechts, bei der ein Gewindesteg der Gewindepumpenstufe in einen Flügel der Füllstufe übergeht.- Figuren 4 bis 6 Teilansichten des Übergangsbereichs zwischen Turbomolekularpumpenstufe und Gewindepumpenstufe von erfindungsgemäß gestalteten Rotoren.
- Figures 1 and 2 partial sections through a pump according to the invention with a total of four design variants of thread pump stage and filling stage.
- FIG. 3 enlarges the variant according to FIG. 1, right, in which a thread bridge of the thread pump stage merges into a wing of the filling stage.
- FIGS. 4 to 6 partial views of the transition area between the turbomolecular pump stage and the threaded pump stage of rotors designed according to the invention.
Die Figuren 1 und 2 zeigen, daß die erfindungsgemäße
Pumpe 1 eine Turbomolekularpumpenstufe 2, eine Füllstufe
3 und eine Gewindepumpenstufe 4 umfaßt. Die Gasförderung
findet zwischen einem Rotor 5 (Rotorabschnitte 5a und
5b) und einem Stator 6 statt. Die Drehachse des Rotors
ist mit 7 bezeichnet. Rotor 5 und /oder Stator 6 tragen
die die Gasförderung bewirkenden Strukturen.Figures 1 and 2 show that the invention
Pump 1 a
Bestandteile der Turbomolekularpumpenstufe 2 sind Statorschaufelreihen
11 und Rotorschaufelreihen 12. Die
Füllsstufe 3 umfaßt mehrere Flügel 13. Die Gewindepumpenstufe
4 ist durch ein Gewinde 14 gekennzeichnet.Components of the
Die Figuren 1 und 2 lassen insgesamt vier Varianten in Bezug auf die Gestaltung von Füllstufe 3 und Gewindepumpenstufe 4 erkennen:
- Fig. 1, links:
Flügel 13 und Gewinde 14
Bestandteil des Stators 6.- Fig. 1, rechts:
Flügel 13 und Gewinde 14
Bestandteil desRotors 5.- Fig. 2, links:
Flügel 13 Bestandteil des Stators 6,
Gewinde 14 Bestandteil desRotors 5.- Fig. 2, rechts:
Flügel 13 Bestandteil desRotors 5,
Gewinde 14 Bestandteil des Stators 6.
- Fig. 1, left:
- Wing 13 and
thread 14
Part of thestator 6. - Fig. 1, right:
- Wing 13 and
thread 14
Part of therotor 5. - Fig. 2, left:
- Wing 13 part of the
stator 6,
Thread 14 part of therotor 5. - Fig. 2, right:
- Wing 13 part of the
rotor 5,
Thread 14 part of thestator 6.
Nicht jedem Steg des Gewindes 14 muß ein Flügel 13 zugeordnet
sein. Je nach Anwendungsfall können weniger oder
mehr Flügel 13 als Gewindestege 14 vorhanden sein.
Zwischen Rotor 5 und Stator 6 befindet sich der Spalt
15, der möglichst klein sein soll und üblicherweise
kleiner als ein Milimeter ist.A
Insbesondere Figur 3 (vergrößerte Darstellung der Ausführungsform
nach Fig. 1, rechts) läßt erkennen, wie die
Flügel 13 gestaltet sind. Es handelt sich bei dieser
Ausführung um flügelartig gestaltete Endabschnitte des
Gewindes 14, die praktisch durch eine starke Zunahme der
Gewindetiefe t gekennzeichnet sind. Diese Zunahme beginnt
in Höhe der gestrichelten Linie 16 und erstreckt
sich über einen relativ kurzen, mit h bezeichneten Längenabschnitt
des Rotors 5.In particular Figure 3 (enlarged view of the
Die Gewindetiefe t nimmt in Richtung Saugseite auf einen
Betrag zu, der etwa der aktiven Länge der Schaufeln der
saugseitig gelegenen Statorschaufelreihe 11 bzw. Rotorschaufelreihe
12 der Turbomolekularpumpenstufe 2 entspricht.
Diese starke Zunahme der Gewindetiefe t erfolgt
zweckmäßig über einen Längenabschnitt h des Rotors 5,
der kleiner ist als die Länge der saugseitig gelegenen
Schaufeln der Turbomolekularpumpstufe 2, vorzugsweise
sogar kleiner als die Hälfte der Länge 1 dieser Schaufeln.
In diesem Bereich nimmt die Gewindetiefe t um den
Faktor 4 bis 8, vorzugsweise etwa 6 zu. In Richtung
Druckseite nimmt die Gewindetiefe t weiterhin ab, allerdings
- wie bisher üblich - relativ langsam. Der Anstellwinkel
der Flügel 13 liegt zwischen dem Anstellwinkel
der benachbarten Schaufeln der Turbomolekularpumpenstufe
2 und der Neigung der benachbarten Gewindestege 14
(Stegwinkel α). The thread depth t increases towards the suction side
Amount that is about the active length of the blades of the
Bei der Ausführungsform, bei der die Flügel 13 rotieren
(Figuren 1 und 2, rechts), befindet sich im montierten
Zustand unmittelbar oberhalb der Flügel 13 eine Statorschaufelreihe
11. Die darüber befindliche Rotorschaufelreihe
12 der Turbemolekularpumpenstufe 2 kann noch am
Rotor 5b der Füll- und der Gewindepumpenstufe 3, 4 befestigt
sein, was insbesondere aus den Figuren 4 bis 6
ersichtlich ist.In the embodiment in which the
Bei den Ausführungsformen, bei denen die Flügel 13 ruhen
(Figuren 1 und 2, links), liegt eine Rotorschaufelreihe
mit ihren Schaufeln 12 unmittelbar über den ruhenden
Flügeln 13. Auch bei dieser Ausführung ist die Schaufelreihe
12 noch am Rotor 5b der Füll- und der Gewindepumpenstufe
3, 4 befestigt.In the embodiments in which the
Die Figuren 4 bis 6 lassen erkennen, daß die Gewindepumpenstufe
4 mehrere Gewindestege 14 aufweist, z.B. zwischen
vier und sechzehn, vorzugsweise acht. Der Stegwinkel
α (zur Horizontalen) liegt zwischen etwa 10° und
20°. Außerdem sind Schaufeln 12 der letzten, druckseitig
gelegenen Schaufelreihe der Turbomolekularpumpenstufe 2
dargestellt, die - wie zu den Figuren 1 bis 3 beschrieben
- noch am Rotorabschnitt 5b der Füllstufe 3 und der
Gewindestufe 4 befestigt sind. Die Anzahl der Schaufeln
12 übersteigt die Anzahl der Flügel 13 um etwa den Faktor
1,5 bis 5, vorzugsweise 4.Figures 4 to 6 show that the thread pump stage
4 has
Bei den Ausführungen nach den Figuren 5 und 6 ist die
Anzahl der Flügel 13 größer als die Anzahl der
Gewindestege 14. Zwischen jedem saugseitig nach Art
eines Flügels gestaltetem Endabschnitt 13 der
Gewindestege 14 befindet sich ein weiterer Flügel 13.In the embodiments according to FIGS. 5 and 6, the
Number of
Claims (11)
- Friction vacuum pump with at least one turbomolecular pump stage (2) and a threaded pump stage (4) adjoining the latter on the pressure side, characterised in that there is located, between the turbomolecular pump stage (2) and the threaded pump stage (4), a filling stage (3) with vanes (13) whose length corresponds, on the suction side, to the active length of those blades of the turbomolecular pump stage (2) which are located on the pressure side, and on the pressure side, to the depth of that region of the thread (14) of the threaded stage (4) which is on the suction side.
- Pump according to claim 1, characterised in that ends of the thread webs (14) which are on the suction side are vane-like in shape and form the vanes (13) of the filling stage (3).
- Pump according to claim 1 or 2, characterised in that the angle of incidence of the vanes (13) has a value which lies between the angle of incidence of those blades of the turbomolecular pump stage (2) which are located on the suction side and the web angle α of that thread (14) of the threaded pump stage (4) which is located on the pressure side.
- Pump according to claim 1, 2 or 3, characterised in that the threaded pump stage (4) has a number of thread webs (14) whose web angle (α) lies between 10° and 20°.
- Pump according to claim 4, characterised in that there are four to sixteen, and preferably eight, thread webs (14).
- Pump according to one of claims 1 to 5, characterised in that the number of vanes (13) in the filling stage (3) is greater than the number of thread webs (14) in the threaded pump stage (4).
- Pump according to one of claims 1 to 6, characterised in that the number of blades in the rows of blades (11, 12) adjacent to the vanes (13) is greater, by a factor of 1.5 to five, and preferably four, than the number of vanes (13).
- Pump according to one of the preceding claims, characterised in that the vanes (13), or the increase in the thread depth (t), extend(s) over a portion (h) of the length of the rotor (5) which is smaller than the length of the blades of the turbomolecular pump stage (2).
- Pump according to claim 8, characterised in that the portion (h) of the length is about half as great as the length of the blades.
- Pump according to one of the preceding claims, characterised in that the rotor (5b) of the threaded pump stage (2) and of the filling stage (3) is a separately manufactured component.
- Pump according to claim 10, characterised in that the rotor (5b) carries, on the suction side, a row of blades (12) belonging to the turbomolecular pump stage (2).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19632874 | 1996-08-16 | ||
DE19632874A DE19632874A1 (en) | 1996-08-16 | 1996-08-16 | Friction vacuum pump |
PCT/EP1997/003477 WO1998007989A1 (en) | 1996-08-16 | 1997-07-02 | Friction vacuum pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0918938A1 EP0918938A1 (en) | 1999-06-02 |
EP0918938B1 true EP0918938B1 (en) | 2002-02-06 |
Family
ID=7802684
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97931744A Expired - Lifetime EP0918938B1 (en) | 1996-08-16 | 1997-07-02 | Friction vacuum pump |
Country Status (5)
Country | Link |
---|---|
US (1) | US6168374B1 (en) |
EP (1) | EP0918938B1 (en) |
JP (1) | JP3957761B2 (en) |
DE (2) | DE19632874A1 (en) |
WO (1) | WO1998007989A1 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE29717079U1 (en) | 1997-09-24 | 1997-11-06 | Leybold Vakuum GmbH, 50968 Köln | Compound pump |
JP3788558B2 (en) | 1999-03-23 | 2006-06-21 | 株式会社荏原製作所 | Turbo molecular pump |
JP2001248587A (en) * | 1999-12-28 | 2001-09-14 | Kashiyama Kogyo Kk | Composite vacuum pump |
US6514035B2 (en) * | 2000-01-07 | 2003-02-04 | Kashiyama Kougyou Industry Co., Ltd. | Multiple-type pump |
DE10046766A1 (en) | 2000-09-21 | 2002-04-11 | Leybold Vakuum Gmbh | Compound-friction vacuum pump |
DE10111525A1 (en) * | 2001-03-09 | 2002-09-12 | Leybold Vakuum Gmbh | Screw vacuum pump with rotor inlet and rotor outlet |
GB0229355D0 (en) | 2002-12-17 | 2003-01-22 | Boc Group Plc | Vacuum pumping arrangement |
US6957801B2 (en) * | 2003-09-30 | 2005-10-25 | Honeywell International, Inc. | Valve having an integrated actuator assembly |
US20090081022A1 (en) * | 2007-09-21 | 2009-03-26 | Honeywell International Inc. | Radially Staged Microscale Turbomolecular Pump |
DE202011002809U1 (en) * | 2011-02-17 | 2012-06-12 | Oerlikon Leybold Vacuum Gmbh | Stator element and high vacuum pump |
KR101883026B1 (en) * | 2011-06-17 | 2018-07-27 | 에드워즈 가부시키가이샤 | Vacuum pump and rotor therefor |
JP6692635B2 (en) * | 2015-12-09 | 2020-05-13 | エドワーズ株式会社 | Connectable thread groove spacer and vacuum pump |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2224009A5 (en) * | 1973-03-30 | 1974-10-25 | Cit Alcatel | |
NL8303927A (en) * | 1983-11-16 | 1985-06-17 | Ultra Centrifuge Nederland Nv | HIGH VACUUM MOLECULAR PUMP. |
US4732529A (en) * | 1984-02-29 | 1988-03-22 | Shimadzu Corporation | Turbomolecular pump |
DE3410905A1 (en) * | 1984-03-24 | 1985-10-03 | Leybold-Heraeus GmbH, 5000 Köln | DEVICE FOR CONVEYING GASES IN SUBATMOSPHAERIC PRESSURES |
JPS6172896A (en) * | 1984-09-17 | 1986-04-14 | Japan Atom Energy Res Inst | High speed rotary pump |
DE3627642C3 (en) * | 1985-08-14 | 1996-03-21 | Rikagaku Kenkyusho | Vacuum pump with thread channel |
FR2611818B1 (en) * | 1987-02-26 | 1991-04-19 | Cit Alcatel | ROTARY MOLECULAR VACUUM PUMP OF THE GAEDE CHANNEL TYPE |
GB2232205B (en) | 1987-12-25 | 1991-11-13 | Sholokhov Valery B | Molecular vacuum pump |
US5217346A (en) * | 1988-07-13 | 1993-06-08 | Osaka Vacuum, Ltd. | Vacuum pump |
EP0408792B1 (en) * | 1989-07-20 | 1993-09-29 | Leybold Aktiengesellschaft | Drag vacuum pump with at least one helical stage at the discharge end |
US5238362A (en) * | 1990-03-09 | 1993-08-24 | Varian Associates, Inc. | Turbomolecular pump |
DE4216237A1 (en) * | 1992-05-16 | 1993-11-18 | Leybold Ag | Gas friction vacuum pump |
DE4314418A1 (en) * | 1993-05-03 | 1994-11-10 | Leybold Ag | Friction vacuum pump with differently designed pump sections |
-
1996
- 1996-08-16 DE DE19632874A patent/DE19632874A1/en not_active Withdrawn
-
1997
- 1997-07-02 JP JP51030298A patent/JP3957761B2/en not_active Expired - Fee Related
- 1997-07-02 EP EP97931744A patent/EP0918938B1/en not_active Expired - Lifetime
- 1997-07-02 DE DE59706325T patent/DE59706325D1/en not_active Expired - Lifetime
- 1997-07-02 WO PCT/EP1997/003477 patent/WO1998007989A1/en active IP Right Grant
- 1997-07-02 US US09/242,004 patent/US6168374B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JP3957761B2 (en) | 2007-08-15 |
WO1998007989A1 (en) | 1998-02-26 |
DE19632874A1 (en) | 1998-02-19 |
DE59706325D1 (en) | 2002-03-21 |
EP0918938A1 (en) | 1999-06-02 |
JP2000516321A (en) | 2000-12-05 |
US6168374B1 (en) | 2001-01-02 |
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