EP2458221A2 - Turbomolecular pump - Google Patents

Turbomolecular pump Download PDF

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Publication number
EP2458221A2
EP2458221A2 EP11008601A EP11008601A EP2458221A2 EP 2458221 A2 EP2458221 A2 EP 2458221A2 EP 11008601 A EP11008601 A EP 11008601A EP 11008601 A EP11008601 A EP 11008601A EP 2458221 A2 EP2458221 A2 EP 2458221A2
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EP
European Patent Office
Prior art keywords
support ring
ring portion
turbomolecular pump
rotor
disc
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.)
Granted
Application number
EP11008601A
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German (de)
French (fr)
Other versions
EP2458221B1 (en
EP2458221A3 (en
Inventor
Michael Schweighöfer
Herbert Stammler
Tobias Stoll
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pfeiffer Vacuum GmbH
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Pfeiffer Vacuum GmbH
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Publication date
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Publication of EP2458221A2 publication Critical patent/EP2458221A2/en
Publication of EP2458221A3 publication Critical patent/EP2458221A3/en
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Publication of EP2458221B1 publication Critical patent/EP2458221B1/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00Axial-flow pumps
    • F04D19/02Multi-stage pumps
    • F04D19/04Multi-stage pumps specially adapted to the production of a high vacuum, e.g. molecular pumps
    • F04D19/042Turbomolecular vacuum pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/40Casings; Connections of working fluid
    • F04D29/52Casings; Connections of working fluid for axial pumps
    • F04D29/54Fluid-guiding means, e.g. diffusers
    • F04D29/541Specially adapted for elastic fluid pumps
    • F04D29/542Bladed diffusers

Definitions

  • the invention relates to a turbomolecular pump according to the preamble of claim 1.
  • turbomolecular pumps have been used in vacuum technology to produce high vacuum and ultrahigh vacuum.
  • the vacuum generation is based in them on a rotor with a plurality along the rotor axis staggered blade rings, between which stator side standing blade rings are arranged.
  • stator blade rings are known in the art.
  • so-called sheet metal stator disks are considered. These are typically made of thin sheet metal by first exposing the blades of the blade ring by punching or cutting and then turning them out of the disk plane in a subsequent forming step. These Blechstatortypn are inexpensive and are particularly popular in the field of Vorvakuums in which the blades are exposed only by a few degrees from the disk plane.
  • each stator-side blade ring is arranged around the shaft of the rotor and usually between two rotor-side blade rings, the assemblability of forming the Blechstatorsay one stage of several, usually two, part discs to form.
  • the small thickness of the sheet becomes a disadvantage: where the part discs abut each other, the thin sheets can slide over each other.
  • the blades of the blade ring are then positioned incorrectly and deviate among others in the direction of the rotor axis from its desired position.
  • the gap between the rotor-side and stator-side blade ring is used up. In special operating conditions, for example at high gas loads can lead to a contact between the rotor-side and stator-side components. In the worst case, the failure of the pump is the result.
  • a stator disk has at least one first part disk with a first support ring portion and a second part disk with a second support ring portion.
  • An abutment surface on the first support ring portion which is tilted against the disk plane and abuts against the second support ring portion, prevents the mutual overlapping of the support ring sections.
  • the idea is to allow the line-like support ring section of a sheet metal stator disk, which is linear in relation to the axial stator disk extension, to abut against a surface.
  • the second dividing disk can have an axial offset relative to the first dividing disk, without the supporting ring section being able to slip past the surface.
  • the abutment surface has portions above and below the disk plane, so that the direction of an axial offset of the second part disk is not a problem and an overlap is prevented.
  • Another development provides to provide the support ring of the second part of the disc with a bead, which abuts at least partially against the abutment surface of the first part of the disc.
  • the bead is in the juxtaposition of the Support ring sections effective axial thickness of the support ring portions increased beyond the thickness of the sheet, whereby the slipping of the support ring sections is suppressed.
  • Another development which takes up the last basic idea, provides to provide abutment surfaces on the first and second support ring portion, between which a flat contact is formed in the assembled state.
  • the additional advantage is that both part discs can be designed as a common part, so that the production is cheaper.
  • a further embodiment provides to tilt a portion of the abutting edge of the second support ring portion against the disk plane, which in turn increases the thickness of the support ring portion effective in abutting the part disks. This structure is very easy to produce.
  • Attaching the abutment surface on the outer support ring opens up the possibility of allowing a lug carrying the abutting surface to interact with a stator component in order to fix the part disc in the radial direction. This means the additional advantage of accurate positioning and fixing of the part discs, which facilitates assembly and makes the stator more robust against mechanical influences, such as mechanical loads from outside or pressure surges due to high gas loads.
  • Fig. 1 It has a flange 4 which is releasably secured to the flange of a chamber to be evacuated. Through the suction port 6 gas is sucked into the pump and discharged through the outlet 8. In the housing 2 rotor 10 and stator 20 are angordnet, by the interaction of the conveying effect is achieved.
  • the rotor comprises a shaft 12 on which a fore vacuum side rotor disk 14, a central rotor disk 16 and a high vacuum side rotor disk 18 are provided, each of the rotor disks having a blade ring consisting of a plurality of blades.
  • the shaft becomes high vacuum side supported rotatably by a permanent magnet bearing 40 and the fore-vacuum side by a rolling bearing 42.
  • a drive 44 translates the rotor into rapid rotation of tens of thousands of revolutions per minute.
  • the stator includes a forward vacuum-side stator disk 24, a middle stator disk 26, and a high-vacuum-side stator disk 28. These are axially spaced apart from each other by spacer rings 30, 32, and 34 with respect to the shaft and are alternately arranged with the rotor disks.
  • the stator discs also have blade rings.
  • the number of rotor and stator disks depends on the desired vacuum parameters, such as suction capacity and pressure ratio between intake opening and outlet.
  • the rotor may be constructed instead of discs also known in the art bell design, also both bearings can be arranged on the vacuum side.
  • Fig. 2 are shown in a plan view, a first part of disk 50 and a second part of disk 52 of the stator 24.
  • the outer support ring 60 to which the blades 80 of the blade ring are fixed, has an outer, first support ring portion 56, which is part of the first part disc, and an outer, second support ring portion 58, which is part of the second part disc.
  • the stator disc has an inner support ring 70 which comprises an inner, first support ring portion 72 and an inner, second support ring portion 74.
  • Each disc has therefore an outer and an inner Supporting ring portion, between each of which a part of the blade ring is arranged.
  • the part discs are shown spaced from each other.
  • the support ring sections of the part discs abut each other. This is done by touching the outer, inner or outer and inner support ring sections.
  • the outer, first support ring portion has a tab 62 against which the outer, second support ring portion 58 abuts.
  • a tab 82 can be provided on the inner, first support ring portion against which the second inner support ring portion abuts.
  • At least one of the part discs has a sufficient number of tabs on one of the support ring portions 56 and 72, so that the overlap is prevented.
  • a tab may be provided in addition to the tab 62 at the other end of the outer, first support ring portion.
  • the part discs are advantageously designed as a common part, that is, both part discs are the same shape and made with an identical process. Therefore, the second dividing disc has tabs 62 'and 82' so that the dividing discs can not slip over each other.
  • the butt portion of the first and second support ring portions 56 and 58 of the outer support ring is in Fig. 3 shown in a side view.
  • the blades 80 of the blade ring are rotated out of the disk plane 54, wherein the angle depends on the vacuum technical requirements. As a rule, the angle decreases from the high-vacuum side to the fore-vacuum side.
  • the provided on the outer, first support ring portion 56 tab 62 has a hook-like bending shape.
  • the abutment surface 64 against which the outer, second support ring section 58 abuts, has a first section 66 below and a second section 68 above the window plane.
  • the second support ring portion 58 can therefore be deflected out of the disk plane in both axial directions, without being able to slide over the first support ring portion 56 and overlap therewith.
  • a modification of this embodiment is in the 4 and 5 shown.
  • Fig. 4 is a partial section along the shaft axis through the vacuum pump of Fig. 1 shown.
  • the shaft 12 carries rotor disks 14 and 16. Between the rotor disks, the stator disk 26 is arranged, whose outer support ring between the spacer rings 30 and 32 is clamped. Surrounding the spacers secures the housing 2, the positioning of the components and gas tightness of the vacuum pump.
  • the spacer ring 32 has a radial stop 90, which limits the radial displacement clearance of the tab 98, which is provided on the outer support ring of the stator 26.
  • First support ring portion 56 of the first part disc and second support ring portion 58 of the second part disc have tabs 98 and 98 ', which are exposed from the disk plane.
  • the angle between the tab and the disc plane is freely selectable.
  • An angle near or equal to 90 ° is advantageous.
  • Shock surface 94 and counter-abutment surface 96 of the tabs touch each other in the assembled state and are preferably with little play in the recess 92 of the spacer ring 32. This not only overlapping the support ring sections and thus the part discs is prevented.
  • it is achieved that both partial discs in the radial direction by the radial stop 90 and the recess 92 aligned and the spacers 30 and 32 are fixed.
  • FIG. 6 With a side sight in Fig. 6 and a section along II-II 'in FIG Fig. 7 a training with a bead is presented.
  • the first support ring portion 56 has an abutment surface 104 against which the second support ring portion 58 abuts. This has a running to the end of the support ring portion bead 106. Through this, the end of the second support ring portion forms a two-dimensional structure that contacts the abutment surface 104. On the one hand, the overlapping is very effectively prevented by this design, on the other hand, the bead gives the support ring section stiffness. This is advantageous especially for an inner support ring section, wherein the axial extent of the bead and the abutting surface should be smaller than the axial extent of the blades 80 turned out of the disk plane.
  • the first support ring portion has an exposed from the disk plane abutment surface 104 against which the second support ring portion 58 abuts. This has a portion 108 of the abutting edge, which is tilted against the disc plane. This creates a two-dimensional structure that can not penetrate the abutment surface 104. This structure is very easy to manufacture and stiffens the support ring section.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Positive Displacement Air Blowers (AREA)

Abstract

The pump has a rotor, and a sheet rotor disk comprising a supporting ring and two partial disks, where the partial disks are provided with respective supporting ring sections (56, 58). The rotor has a shaft, and the rotor disk is arranged on the shaft. One of the ring sections has an abutting surface (64) that is tilted against a disk plane (54), where another ring section is pushed against the abutting surface. The abutting surface is arranged at a latch (62) that works together with a stator component for fixing one of the partial disks in a radial plane.

Description

Die Erfindung betrifft eine Turbomolekularpumpe nach dem Oberbegriff des Anspruchs 1.The invention relates to a turbomolecular pump according to the preamble of claim 1.

Seit Jahrzehnten werden Turbomolekularpumpen in der Vakuumtechnik zur Erzeugung von Hochvakuum und Ultrahochvakuum eingesetzt. Die Vakuumerzeugung beruht in ihnen auf einem Rotor mit mehreren entlang der Rotorachse zueinander versetzten Schaufelkränzen, zwischen denen statorseitig stehende Schaufelkränze angeordnet sind.For decades, turbomolecular pumps have been used in vacuum technology to produce high vacuum and ultrahigh vacuum. The vacuum generation is based in them on a rotor with a plurality along the rotor axis staggered blade rings, between which stator side standing blade rings are arranged.

Verschiedene Gestaltungsformen der statorseitigen Schaufelkränze sind im Stand der Technik bekannt. Nachfolgend werden so genannte Blechstatorscheiben betrachtet. Diese werden typischerweise aus Feinblech hergestellt, indem zunächst durch Stanzen oder Schneiden die Schaufeln des Schaufelkranzes freigelegt und in einem nachfolgenden Umformschritt aus der Scheibenebene herausgedreht werden. Diese Blechstatorscheiben sind kostengünstig und sind insbesondere für den Bereich des Vorvakuums beliebt, in welchem die Schaufeln nur um wenige Grad aus der Scheibenebene herausgestellt sind.Various designs of the stator blade rings are known in the art. In the following, so-called sheet metal stator disks are considered. These are typically made of thin sheet metal by first exposing the blades of the blade ring by punching or cutting and then turning them out of the disk plane in a subsequent forming step. These Blechstatorscheiben are inexpensive and are particularly popular in the field of Vorvakuums in which the blades are exposed only by a few degrees from the disk plane.

Da jeder statorseitige Schaufelkranz um die Welle des Rotors herum und in der Regel zwischen zwei rotorseitigen Schaufelkränzen angeordnet ist, erfordert die Montierbarkeit, die Blechstatorscheibe einer Stufe aus mehreren, in der Regel zwei, Teilscheiben zu bilden. Dadurch wird die geringe Dicke des Bleches zu einem Nachteil: dort, wo die Teilscheiben aneinanderstoßen, können die dünnen Bleche übereinanderrutschen. Die Schaufeln des Schaufelkranzes sind dann falsch positioniert und weichen unter anderem in Richtung der Rotorachse von ihrer Solllage ab. In der Folge wird der Spalt zwischen rotorseitigem und statorseitigem Schaufelkranz aufgebraucht. In besonderen Betriebsbedingungen, beispielsweise bei hohen Gaslasten kann dies zu einem Kontakt zwischen rotorseitigen und statorseitigen Bauteilen führen. Im schlimmsten Fall ist das Versagen der Pumpe die Folge.Since each stator-side blade ring is arranged around the shaft of the rotor and usually between two rotor-side blade rings, the assemblability of forming the Blechstatorscheibe one stage of several, usually two, part discs to form. As a result, the small thickness of the sheet becomes a disadvantage: where the part discs abut each other, the thin sheets can slide over each other. The blades of the blade ring are then positioned incorrectly and deviate among others in the direction of the rotor axis from its desired position. As a result, the gap between the rotor-side and stator-side blade ring is used up. In special operating conditions, for example at high gas loads can lead to a contact between the rotor-side and stator-side components. In the worst case, the failure of the pump is the result.

Es ist daher Aufgabe der Erfindung eine Turbomolekularpumpe vorzustellen, in welcher das Überlappen der Teilscheiben verhindert ist.It is therefore an object of the invention to present a turbomolecular pump, in which the overlapping of the part discs is prevented.

Diese Aufgabe wird gelöst durch eine Turbomolekularpumpe mit den Merkmalen des ersten Anspruchs. Die abhängigen Ansprüche 2 bis 8 geben vorteilhafte Weiterbildungen an, deren Merkmale untereinander kombinierbar sind.This object is achieved by a turbomolecular pump having the features of the first claim. The dependent claims 2 to 8 indicate advantageous developments, whose characteristics can be combined with each other.

Eine Statorscheibe weist wenigstens eine erste Teilscheibe mit einem ersten Tragringabschnitt und eine zweite Teilscheibe mit einem zweiten Tragringabschnitt auf. Eine Stoßfläche am ersten Tragringabschnitt, die gegen die Scheibenebene verkippt ist und gegen die der zweite Tragringabschnitt stößt, verhindert das gegenseitige Überlappen der Tragringabschnitte. Der Gedanke ist, den im Verhältnis zur axialen Statorscheibenausdehnung linienartigen Tragringabschnitt einer Blechstatorscheibe gegen eine Fläche stoßen zu lassen. Durch diese Fläche kann die zweite Teilscheibe einen axialen Versatz gegenüber der ersten Teilscheibe aufweisen, ohne dass der Tragringabschnitt an der Fläche vorbeirutschen kann.A stator disk has at least one first part disk with a first support ring portion and a second part disk with a second support ring portion. An abutment surface on the first support ring portion, which is tilted against the disk plane and abuts against the second support ring portion, prevents the mutual overlapping of the support ring sections. The idea is to allow the line-like support ring section of a sheet metal stator disk, which is linear in relation to the axial stator disk extension, to abut against a surface. As a result of this surface, the second dividing disk can have an axial offset relative to the first dividing disk, without the supporting ring section being able to slip past the surface.

Der Gedanke lässt sich vorteilhaft weiterbilden, indem die Stoßfläche Abschnitte ober- und unterhalb der Scheibenebene aufweist, so dass die Richtung eines axialen Versatzes der zweiten Teilscheibe kein Problem darstellt und eine Überlappung verhindert bleibt.The idea can advantageously be further developed in that the abutment surface has portions above and below the disk plane, so that the direction of an axial offset of the second part disk is not a problem and an overlap is prevented.

Eine andere Weiterbildung sieht vor, den Tragring der zweiten Teilscheibe mit einer Sicke zu versehen, die wenigstens abschnittsweise gegen die Stoßfläche der ersten Teilscheibe stößt. Durch die Sicke wird die im Aneinanderstoßen der Tragringabschnitte wirksame axiale Dicke der Tragringabschnitte über die Stärke des Bleches hinaus erhöht, wodurch das Übereinanderrutschen der Tragringabschnitte unterbunden wird.Another development provides to provide the support ring of the second part of the disc with a bead, which abuts at least partially against the abutment surface of the first part of the disc. By the bead is in the juxtaposition of the Support ring sections effective axial thickness of the support ring portions increased beyond the thickness of the sheet, whereby the slipping of the support ring sections is suppressed.

Eine andere Weiterbildung, die den letzten Grundgedanken aufgreift, sieht vor, Stoßflächen an erstem und zweitem Tragringabschnitt vorzusehen, zwischen denen im montierten Zustand ein flächiger Kontakt entsteht. Der zusätzlich Vorteil besteht darin, dass beide Teilscheiben als Gleichteil gestalten werden können, so dass die Herstellung kostengünstiger wird.Another development, which takes up the last basic idea, provides to provide abutment surfaces on the first and second support ring portion, between which a flat contact is formed in the assembled state. The additional advantage is that both part discs can be designed as a common part, so that the production is cheaper.

Eine Weiterbildung sieht vor, einen Abschnitt der Stoßkante des zweiten Tragringabschnitts gegen die Scheibenebene zu verkippen, wodurch wiederum die im Aneinanderstoßen der Teilscheiben wirksame Dicke des Tragringabschnitts erhöht wird. Diese Struktur ist sehr leicht herstellbar.A further embodiment provides to tilt a portion of the abutting edge of the second support ring portion against the disk plane, which in turn increases the thickness of the support ring portion effective in abutting the part disks. This structure is very easy to produce.

Anordnen des Tragrings außerhalb des Schaufelkranzes, so dass er letzteren umgibt, bringt als Weiterbildung den zusätzlichen Vorteil, dass an dieser Stelle größere Gestaltungsfreiheiten genutzt werden können, während innerhalb des Schaufelkranzes vorgesehener Tragring zu Gunsten enger Axialspalte zwischen Statorscheibe und Rotorscheiben möglichst flach gestaltet bleiben kann, beispielsweise mit der Dicke des verwendeten Feinblechs.Arranging the support ring outside of the blade ring, so that it surrounds the latter, brings as training the additional advantage that greater freedom of design can be used at this point, while provided within the blade ring support ring in favor of narrow axial gaps between the stator and rotor disks can remain as flat as possible, for example, with the thickness of the thin sheet used.

Anbringen der Stoßfläche am äußeren Tragring eröffnet die Möglichkeit, eine die Stoßfläche tragende Lasche mit einem Statorbauteil zusammenwirken zu lassen, um die Teilscheibe in radialer Richtung festzulegen. Dies bedeutet den zusätzlichen Vorteil einer genauen Positionierung und Fixierung der Teilscheiben, was die Montage erleichtert und den Stator robuster gegen mechanische Einflüsse macht, beispielsweise mechanischen Belastungen von außen oder Druckstößen durch hohe Gaslasten.Attaching the abutment surface on the outer support ring opens up the possibility of allowing a lug carrying the abutting surface to interact with a stator component in order to fix the part disc in the radial direction. This means the additional advantage of accurate positioning and fixing of the part discs, which facilitates assembly and makes the stator more robust against mechanical influences, such as mechanical loads from outside or pressure surges due to high gas loads.

An Hand von Ausführungsbeispielen und deren Weiterbildungen soll die Erfindung näher erläutert und die Darstellung ihrer Vorteile vertieft werden.With reference to embodiments and their developments, the invention will be explained in more detail and the representation of its benefits to be deepened.

Es zeigen:

Fig. 1:
Schematischer Schnitt durch eine Turbomolekularpumpe;
Fig. 2:
Draufblick auf zwei Teilscheiben einer Statorscheibe gemäß erstem Ausführungsbeispiel;
Fig. 3:
Seitlicher Blick auf den Stoßbereich der Teilscheiben;
Fig. 4:
Teilschnitt durch Rotor und Stator der Turbomolekularpumpe gemäß zweitem Ausführungsbeispiel;
Fig. 5:
Entlang der Linie I-I' teilgeschnittene und explodierte Ansicht von Teilscheiben und Distanzringen;
Fig. 6:
Blick auf den Berührungsbereich der Teilscheiben gemäß einem dritten Ausführungsbeispiel;
Fig. 7:
Schnitt durch die Anordnung nach Fig 6 entlang der Linie II-II';
Fig. 8:
Blick auf den Berührungsbereich der Teilscheiben gemäß einem vierten Ausführungsbeispiel;
Fig. 9:
Schnitt durch die Anordnung nach Fig. 8 entlang der Linie III-III'.
Show it:
Fig. 1:
Schematic section through a turbomolecular pump;
Fig. 2:
A view of two part discs of a stator according to the first embodiment;
3:
Side view of the impact area of the part discs;
4:
Partial section through the rotor and stator of the turbomolecular pump according to the second embodiment;
Fig. 5:
Partially cut and exploded view of partial disks and spacers along line II ';
Fig. 6:
View of the contact area of the part discs according to a third embodiment;
Fig. 7:
Section through the arrangement after Fig. 6 along the line II-II ';
Fig. 8:
View of the contact area of the part discs according to a fourth embodiment;
Fig. 9:
Section through the arrangement after Fig. 8 along the line III-III '.

Es zeigt Fig. 1 einen Schnitt durch eine Turbomolekularpumpe 1. Sie besitzt einen Flansch 4, der lösbar an dem Flansch einer zu evakuierenden Kammer befestigt ist. Durch die Ansaugöffnung 6 wird Gas in die Pumpe eingesaugt und durch den Auslass 8 ausgestoßen. Im Gehäuse 2 sind Rotor 10 und Stator 20 angordnet, durch deren Zusammenwirken die Förderwirkung erreicht wird.It shows Fig. 1 It has a flange 4 which is releasably secured to the flange of a chamber to be evacuated. Through the suction port 6 gas is sucked into the pump and discharged through the outlet 8. In the housing 2 rotor 10 and stator 20 are angordnet, by the interaction of the conveying effect is achieved.

Der Rotor umfasst eine Welle 12, auf der eine vorvakuumseitige Rotorscheibe 14, eine mittlere Rotorscheibe 16 und eine hochvakuumseitige Rotorscheibe 18 vorgesehen sind, wobei jede der Rotorscheiben einen aus einer Mehrzahl von Schaufeln bestehenden Schaufelkranz besitzt. Die Welle wird hochvakuumseitig durch ein Permanentmagnetlager 40 und vorvakuumseitig durch ein Wälzlager 42 drehbar unterstützt. Ein Antrieb 44 versetzt den Rotor in schnelle Drehung von einigen Zehntausend Umdrehungen in der Minute.The rotor comprises a shaft 12 on which a fore vacuum side rotor disk 14, a central rotor disk 16 and a high vacuum side rotor disk 18 are provided, each of the rotor disks having a blade ring consisting of a plurality of blades. The shaft becomes high vacuum side supported rotatably by a permanent magnet bearing 40 and the fore-vacuum side by a rolling bearing 42. A drive 44 translates the rotor into rapid rotation of tens of thousands of revolutions per minute.

Der Stator umfasst eine vorvakuumseitige Statorscheibe 24, eine mittlere Statorscheibe 26 und eine hochvakuumseitige Statorscheibe 28. Diese sind durch Distanzringe 30, 32 und 34 in Bezug auf die Welle axial von einander beabstandet und mit den Rotorscheiben alternierend angeordnet. Die Statorscheiben besitzen ebenfalls Schaufelkränze.The stator includes a forward vacuum-side stator disk 24, a middle stator disk 26, and a high-vacuum-side stator disk 28. These are axially spaced apart from each other by spacer rings 30, 32, and 34 with respect to the shaft and are alternately arranged with the rotor disks. The stator discs also have blade rings.

Die Anzahl von Rotor- und Statorscheiben hängt von den gewünschten vakuumtechnischen Parametern wie Saugvermögen und Druckverhältnis zwischen Ansaugöffnung und Auslass ab. Der Rotor kann anstelle von Scheiben auch in im Stand der Technik bekannter Glockenbauweise gebaut sein, zudem können beide Lager vorvakuumseitig angeordnet sein.The number of rotor and stator disks depends on the desired vacuum parameters, such as suction capacity and pressure ratio between intake opening and outlet. The rotor may be constructed instead of discs also known in the art bell design, also both bearings can be arranged on the vacuum side.

Die nachfolgend anhand der Fig. 2 bis 10 beschriebenen Ausführungsbeispiele können auf eine, mehrere oder jede der aus Feinblech hergestellten Statorscheiben der Turbomolekularpumpe angewendet werden.The following are based on the Fig. 2 to 10 described embodiments may be applied to one, several or each of the stator made of sheet steel turbomolecular pump.

In Fig. 2 sind in einem Draufblick eine erste Teilscheibe 50 und eine zweite Teilscheibe 52 der Statorscheibe 24 dargestellt. Der äußere Tragring 60, an welchem die Schaufeln 80 des Schaufelkranzes befestigt sind, besitzt einen äußeren, ersten Tragringabschnitt 56, welcher Teil der ersten Teilscheibe ist, und einen äußeren, zweiten Tragringabschnitt 58, welcher Teil der zweiten Teilscheibe ist. Außerdem weist die Statorscheibe einen inneren Tragring 70 auf, welcher einen inneren, ersten Tragringabschnitt 72 und einen inneren, zweiten Tragringabschnitt 74 umfasst. Jede Teilscheibe besitzt daher einen äußeren und einen inneren Tragringabschnitt, zwischen denen jeweils ein Teil des Schaufelkranzes angeordnet ist.In Fig. 2 are shown in a plan view, a first part of disk 50 and a second part of disk 52 of the stator 24. The outer support ring 60, to which the blades 80 of the blade ring are fixed, has an outer, first support ring portion 56, which is part of the first part disc, and an outer, second support ring portion 58, which is part of the second part disc. In addition, the stator disc has an inner support ring 70 which comprises an inner, first support ring portion 72 and an inner, second support ring portion 74. Each disc has therefore an outer and an inner Supporting ring portion, between each of which a part of the blade ring is arranged.

In der Darstellung sind die Teilscheiben voneinander beabstandet gezeichnet. Im montierten Zustand stoßen die Tragringabschnitte der Teilscheiben aneinander. Dies geschieht durch Berührung der äußeren, der inneren oder äußerer und innerer Tragringabschnitte.In the illustration, the part discs are shown spaced from each other. In the mounted state, the support ring sections of the part discs abut each other. This is done by touching the outer, inner or outer and inner support ring sections.

Der äußere, erste Tragringabschnitt weist eine Lasche 62 auf, gegen die der äußere, zweite Tragringabschnitt 58 stößt. Zusätzlich kann am inneren, ersten Tragringabschnitt eine Lasche 82 vorgesehen sein, gegen die der zweite innere Tragringabschnitt stößt.The outer, first support ring portion has a tab 62 against which the outer, second support ring portion 58 abuts. In addition, a tab 82 can be provided on the inner, first support ring portion against which the second inner support ring portion abuts.

Wenigstens eine der Teilscheibe besitzt eine hinreichende Anzahl Laschen an einem der Tragringabschnitte 56 und 72, so dass das Überlappen verhindert wird. Beispielsweise kann neben der Lasche 62 am anderen Ende des äußeren, ersten Tragringabschnittes ebenfalls eine Lasche vorgesehen sein. Im Beispiel sind die Teilscheiben jedoch vorteilhaft als Gleichteil gestaltet, das heißt, beide Teilscheiben sind gleichgestaltet und mit einem identischen Verfahren hergestellt. Daher weist die zweite Teilscheibe Laschen 62' und 82' auf, so dass die Teilscheiben nicht übereinander rutschen können.At least one of the part discs has a sufficient number of tabs on one of the support ring portions 56 and 72, so that the overlap is prevented. For example, in addition to the tab 62 at the other end of the outer, first support ring portion also a tab may be provided. In the example, however, the part discs are advantageously designed as a common part, that is, both part discs are the same shape and made with an identical process. Therefore, the second dividing disc has tabs 62 'and 82' so that the dividing discs can not slip over each other.

Der Stoßbereich von erstem und zweitem Tragringabschnitt 56 und 58 des äußeren Tragringes ist in Fig. 3 in einem seitlichen Blick dargestellt. Die Schaufeln 80 des Schaufelkranzes sind aus der Scheibenebene 54 herausgedreht, wobei der Winkel von den vakuumtechnischen Anforderungen abhängt. In der Regel nimmt der Winkel von Hochvakuumseite zu Vorvakuumseite ab.The butt portion of the first and second support ring portions 56 and 58 of the outer support ring is in Fig. 3 shown in a side view. The blades 80 of the blade ring are rotated out of the disk plane 54, wherein the angle depends on the vacuum technical requirements. As a rule, the angle decreases from the high-vacuum side to the fore-vacuum side.

Die am äußeren, ersten Tragringabschnitt 56 vorgesehene Lasche 62 weist eine hakenartige Biegeform auf. Dies führt dazu, dass die Stoßfläche 64, gegen die der äußere, zweite Tragringabschnitt 58 stößt, einen ersten Abschnitt 66 unterhalb und einen zweiten Abschnitt 68 oberhalb der Scheibenebene besitzt. Der zweite Tragringabschnitt 58 kann daher in beiden axialen Richtungen aus der Scheibenebene ausgelenkt werden, ohne dass er über den ersten Tragringabschnitt 56 rutschen und mit diesem Überlappen kann.The provided on the outer, first support ring portion 56 tab 62 has a hook-like bending shape. As a result, the abutment surface 64, against which the outer, second support ring section 58 abuts, has a first section 66 below and a second section 68 above the window plane. The second support ring portion 58 can therefore be deflected out of the disk plane in both axial directions, without being able to slide over the first support ring portion 56 and overlap therewith.

Eine Abwandlung dieses Ausführungsbeispiels ist in den Fig. 4 und 5 gezeigt.A modification of this embodiment is in the 4 and 5 shown.

In Fig. 4 ist ein Teilschnitt entlang der Wellenachse durch die Vakuumpumpe von Fig. 1 dargestellt. Die Welle 12 trägt Rotorscheiben 14 und 16. Zwischen den Rotorscheiben ist die Statorscheibe 26 angeordnet, deren äußerer Tragring zwischen Distanzringen 30 und 32 eingeklemmt ist. Die Distanzringe umgebend sichert das Gehäuse 2 die Positionierung der Bauteile und Gasdichtheit der Vakuumpumpe. Der Distanzring 32 weist einen Radialanschlag 90 auf, welcher den radialen Verschiebespielraum der Lasche 98 begrenzt, welche am äußeren Tragring der Statorscheibe 26 vorgesehen ist.In Fig. 4 is a partial section along the shaft axis through the vacuum pump of Fig. 1 shown. The shaft 12 carries rotor disks 14 and 16. Between the rotor disks, the stator disk 26 is arranged, whose outer support ring between the spacer rings 30 and 32 is clamped. Surrounding the spacers secures the housing 2, the positioning of the components and gas tightness of the vacuum pump. The spacer ring 32 has a radial stop 90, which limits the radial displacement clearance of the tab 98, which is provided on the outer support ring of the stator 26.

Der Ausschnitt I-I' aus Fig. 4 ist in Fig. 5 zum besseren Verständnis explodiert dargestellt. Erster Tragringabschnitt 56 der ersten Teilscheibe und zweiter Tragringabschnitt 58 der zweiten Teilscheibe besitzen Laschen 98 und 98', die aus der Scheibenebene herausgestellt sind. Der Winkel zwischen Lasche und Scheibenebene ist dabei frei wählbar. Vorteilhaft ist ein Winkel nahe oder gleich 90°. Stoßfläche 94 und Gegenstoßfläche 96 der Laschen berühren einander im montierten Zustand und befinden sich vorzugsweise mit geringem Spiel in der Ausnehmung 92 des Distanzringes 32. Hierdurch wird nicht nur ein Überlappen der Tragringabschnitte und damit der Teilscheiben verhindert. Zusätzlich wird erreicht, dass beide Teilscheiben in radialer Richtung durch den Radialanschlag 90 und die Ausnehmung 92 ausgerichtet und die Distanzringe 30 und 32 fixiert werden.The section II 'off Fig. 4 is in Fig. 5 exploded for clarity. First support ring portion 56 of the first part disc and second support ring portion 58 of the second part disc have tabs 98 and 98 ', which are exposed from the disk plane. The angle between the tab and the disc plane is freely selectable. An angle near or equal to 90 ° is advantageous. Shock surface 94 and counter-abutment surface 96 of the tabs touch each other in the assembled state and are preferably with little play in the recess 92 of the spacer ring 32. This not only overlapping the support ring sections and thus the part discs is prevented. In addition, it is achieved that both partial discs in the radial direction by the radial stop 90 and the recess 92 aligned and the spacers 30 and 32 are fixed.

Aus den Fig. 6 bis 9 gehen weitere Gestaltungsmöglichkeiten hervor.From the Fig. 6 to 9 go further design possibilities.

Mit einem seitlichen Anblick in Fig. 6 und einem Schnitt entlang II-II' in Fig. 7 wird eine Weiterbildung mit einer Sicke vorgestellt.With a side sight in Fig. 6 and a section along II-II 'in FIG Fig. 7 a training with a bead is presented.

Der erste Tragringabschnitt 56 besitzt eine Stoßfläche 104, gegen die der zweite Tragringabschnitt 58 stößt. Dieser weist eine bis zum Ende des Tragringabschnitts laufende Sicke 106 auf. Durch diese bildet das Ende des zweiten Tragringabschnitts eine zweidimensionale Struktur, die die Stoßfläche 104 berührt. Zum einen wird durch diese Gestaltung das Überlappen sehr effektiv verhindert, zum anderen verleiht die Sicke dem Tragringabschnitt Steifigkeit. Gerade für einen inneren Tragringabschnitt ist dies von Vorteil, wobei die axiale Ausdehnung von Sicke und der Stoßfläche kleiner sein sollte als die axiale Ausdehnung der aus der Scheibenebene herausgedrehten Schaufeln 80.The first support ring portion 56 has an abutment surface 104 against which the second support ring portion 58 abuts. This has a running to the end of the support ring portion bead 106. Through this, the end of the second support ring portion forms a two-dimensional structure that contacts the abutment surface 104. On the one hand, the overlapping is very effectively prevented by this design, on the other hand, the bead gives the support ring section stiffness. This is advantageous especially for an inner support ring section, wherein the axial extent of the bead and the abutting surface should be smaller than the axial extent of the blades 80 turned out of the disk plane.

Eine leicht zu fertigende und ebenfalls Steifigkeit in den Tragringabschnitt bringenden Abwandlung ist im seitlichen Anblick in Fig. 8 und im Schnitt entlang III-III' in Fig. 9 gezeigt.An easy to manufacture and also rigidity in the support ring section bringing modification is in the side view in Fig. 8 and in section along III-III 'in Fig. 9 shown.

Der erste Tragringabschnitt weist eine aus der Scheibenebene herausgestellte Stoßfläche 104 auf, gegen die der zweite Tragringabschnitt 58 stößt. Dieser besitzt einen Abschnitt 108 der Stoßkante, der gegen die Scheibenebene verkippt ist. Hierdurch entsteht eine zweidimensionale Struktur, die die Stoßfläche 104 nicht durchdringen kann. Diese Struktur ist sehr leicht herstellbar und versteift den Tragringabschnitt.The first support ring portion has an exposed from the disk plane abutment surface 104 against which the second support ring portion 58 abuts. This has a portion 108 of the abutting edge, which is tilted against the disc plane. This creates a two-dimensional structure that can not penetrate the abutment surface 104. This structure is very easy to manufacture and stiffens the support ring section.

An den unterschiedlichen Enden der Tragringabschnitte können verschiedene der gezeigten Maßnahmen eingesetzt werden, so dass an einer Teilscheibe eines oder mehrere der vorgestellten Beispiele kombiniert werden. Auch ist die Kombination einzelner Merkmale der Beispiele möglich, beispielsweise die Kombination einer hakenartig geformten Lasche an einem Tragringabschnitt mit einer Sicke auf dem berührenden zweiten Tragringabschnitt.At the different ends of the support ring sections, various of the measures shown can be used, so that one or more of the presented examples are combined on a part disc. Also, the combination of individual features of the examples is possible, for example, the combination of a hook-like shaped tab on a support ring portion with a bead on the contacting second support ring portion.

Claims (8)

Turbomolekularpumpe (1) mit einem Rotor (10) und einer Blechstatorscheibe (24, 26, 28), welche einen Schaufelkranz, einen Tragring (60, 70), eine erste Teilscheibe (50) mit einem ersten Tragringabschnitt (56, 72) und eine zweite Teilscheibe (52) mit einem zweiten Tragringabschnitt (58, 74) umfasst und eine Scheibenebene (54) festlegt,
dadurch gekennzeichnet, dass der erste Tragringabschnitt eine gegen die Scheibenebene verkippte Stoßfläche (64; 94; 96; 104) aufweist, gegen die der zweite Tragringabschnitt stößt.
Turbomolecular pump (1) having a rotor (10) and a Blechstatorscheibe (24, 26, 28), which a blade ring, a support ring (60, 70), a first part disc (50) having a first support ring portion (56, 72) and a second dividing disc (52) having a second support ring portion (58, 74) and defining a disc plane (54),
characterized in that the first support ring portion has a tilted against the disc plane abutting surface (64; 94; 96; 104), against which the second support ring portion abuts.
Turbomolekularpumpe nach Anspruch 1, dadurch gekennzeichnet, dass die Stoßfläche (64) einen ersten und einen zweiten Abschnitt aufweist und der erste Abschnitt (66) auf einer Seite der Scheibenebene liegt und der zweite Abschnitt (68) auf der der ersten Seite gegenüberliegende Seite der Scheibenebene (54) liegt.Turbomolecular pump according to claim 1, characterized in that the abutment surface (64) has a first and a second portion and the first portion (66) on one side of the disc plane and the second portion (68) on the first side opposite side of the disc plane (54) lies. Turbomolekularpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der zweite Tragringabschnitt (58) eine Sicke (106) aufweist, welche bis zu einem Ende des zweiten Tragringabschnitts ausgebildet ist und so gegen die Stoßfläche (64) stößt.Turbomolecular pump according to claim 1 or 2, characterized in that the second support ring portion (58) has a bead (106) which is formed to one end of the second support ring portion and so abuts against the abutment surface (64). Turbomolekularpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der zweite Tragringabschnitt (58) eine Gegenstoßfläche (96) aufweist, welche die Stoßfläche (64) berührt.Turbomolecular pump according to claim 1 or 2, characterized in that the second support ring portion (58) has a counter-abutment surface (96) which contacts the abutment surface (64). Turbomolekularpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der zweite Tragringabschnitt (58) eine Stoßkante aufweist, welche einen gegen die Scheibenebene verkippten Abschnitt (108), welcher mit der Stoßfläche (104) zusammenwirkt.Turbomolecular pump according to claim 1 or 2, characterized in that the second support ring portion (58) has a abutting edge, which has a tilted against the disc plane portion (108), which with the Collision surface (104) cooperates. Turbomolekularpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Tragring (56, 58) den Schaufelkranz umgibt.Turbomolecular pump according to one of the preceding claims, characterized in that the support ring (56, 58) surrounds the blade ring. Turbomolekularpumpe nach Anspruch 6, dadurch gekennzeichnet, dass die Stoßfläche (94; 96) an einer Lasche angeordnet ist, welche mit einem Statorbauteil (32) zusammenwirkt, um die Teilscheibe in einer radialen Richtung festzulegen.Turbomolecular pump according to claim 6, characterized in that the abutment surface (94; 96) is arranged on a tab which cooperates with a stator component (32) to fix the part disc in a radial direction. Turbomolekularpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Stoßfläche (64; 94, 96; 104) einen nahezu rechten Winkel mit der Scheibenebene bildet.Turbomolecular pump according to one of the preceding claims, characterized in that the abutment surface (64; 94, 96; 104) forms an almost right angle with the disc plane.
EP11008601.4A 2010-11-26 2011-10-27 Turbomolecular pump Active EP2458221B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2894348A1 (en) * 2014-01-09 2015-07-15 Pfeiffer Vacuum Gmbh Stator disc

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Publication number Priority date Publication date Assignee Title
DE102013114576A1 (en) * 2013-12-19 2015-06-25 Pfeiffer Vacuum Gmbh stator

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Publication number Priority date Publication date Assignee Title
JP3013083B2 (en) * 1998-06-23 2000-02-28 セイコー精機株式会社 Turbo molecular pump
JP4527966B2 (en) * 2003-05-01 2010-08-18 株式会社大阪真空機器製作所 Molecular pump

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Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2894348A1 (en) * 2014-01-09 2015-07-15 Pfeiffer Vacuum Gmbh Stator disc

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EP2458221A3 (en) 2016-03-02
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