EP2295813B1 - Rotor de pompe turbo-moléculaire - Google Patents

Rotor de pompe turbo-moléculaire Download PDF

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Publication number
EP2295813B1
EP2295813B1 EP10007376.6A EP10007376A EP2295813B1 EP 2295813 B1 EP2295813 B1 EP 2295813B1 EP 10007376 A EP10007376 A EP 10007376A EP 2295813 B1 EP2295813 B1 EP 2295813B1
Authority
EP
European Patent Office
Prior art keywords
rotor
pump
turbomolecular pump
rings
turbomolecular
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.)
Active
Application number
EP10007376.6A
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German (de)
English (en)
Other versions
EP2295813A3 (fr
EP2295813A2 (fr
Inventor
Helmut Bernhardt
Bernhard Tatzber
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
Original Assignee
Pfeiffer Vacuum GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pfeiffer Vacuum GmbH filed Critical Pfeiffer Vacuum GmbH
Publication of EP2295813A2 publication Critical patent/EP2295813A2/fr
Publication of EP2295813A3 publication Critical patent/EP2295813A3/fr
Application granted granted Critical
Publication of EP2295813B1 publication Critical patent/EP2295813B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/321—Rotors specially for elastic fluids for axial flow pumps for axial flow compressors

Definitions

  • the invention relates to a turbomolecular pump rotor according to the preamble of the first claim.
  • a first common design is to provide disks with a series of turbo blades and to shrivel or clamp them onto a shaft.
  • Such a structure shows the EP 1 559 914 A1 , Especially in turbomolecular pumps with high pumping speed and five-axis active magnetic bearing this leads to large overall lengths.
  • Another common design creates a shorter design by a central shaft is surrounded by the necessary drive and bearing components of a rotor body, the shaft and rotor body are connected to each other frontally.
  • the rotor body may be constructed of a plurality of disks, such as the DE 1728487 shows.
  • the speeds of turbomolecular pumps are in the range of tens of thousands of revolutions per minute.
  • the safety in the case of the burst is increased since the turbomolecular pump rotor according to claim 1 is not a continuous rotor body. This reduces the size of the debris and lengthens the tearing process. As a result, an overload of the connection of the housing of the turbo pump and the recipient to be pumped is prevented.
  • the first rotor part which includes the first pumping structure and the second pumping structure, may be made of flat material, which is available at a higher budget for a given cost. This leads to a further increase in security.
  • This configuration can be further developed by the first rotor part having a recess which extends in the axial direction and lies radially inward, the means extending from the axis of symmetry and rotation in the radial direction, that a cavity is formed.
  • a cavity is formed in this cavity then advantageously other components may be arranged, for example, a labyrinth seal or parts of the storage and the drive. This saves construction length.
  • the third pump structure is formed by at least two support rings with a respective rotor blade ring.
  • this increases safety, since individual disks in the burst behave uncritically; on the other hand, the disk design allows greater freedom in the design of the blades, especially in the high-vacuum range.
  • the blades In the high vacuum range, the blades are set steeply against the direction of movement and extend long in the axial and tangential direction. If several rows of blades for this pressure range are arranged on a common body, the design is restricted by manufacturing methods such as milling and sawing. This does not apply to disks, so that better vacuum data is achieved in this way.
  • turbomolecular pump rotor has a second rotor part with at least two pump structures.
  • a first, unclaimed example of a turbomolecular pump rotor is in a section along the axis of rotation in FIG FIG. 1 shown.
  • the figure shows first part 160 of the housing of the turbomolecular vacuum pump, hereinafter turbopump.
  • This part takes on the motor coil 161, which generates a rotating magnetic field. This cooperates with the motor magnet 162 and sets the turbomolecular pump rotor in rapid rotation.
  • the motor magnet is covered by a sleeve 163 and secured against the negative effects of the applied centrifugal forces secured to the shaft 132 of the turbomolecular pump rotor.
  • the shaft has on one of its end faces, preferably facing the high vacuum side, a recess in which at least one permanent magnet ring 190 is arranged, which forms the rotor-side part of a lubricant-free magnetic bearing for supporting the turbomolecular pump rotor.
  • the turbopump has a pump stator which comprises stator disks 112, 116, 120 and 124 provided with blades as stator-side pumping structures, which are axially spaced apart from one another by means of spacer rings 113, 117, 121 and 125.
  • the pump stator also includes a Holweckstator 128 as a further stator-side pumping structure.
  • the turbomolecular pump rotor includes rotor blade rings 111, 115, 119 and 123 and a rotor sleeve 127 as rotor-side pumping structures.
  • the rotor blade rings are each formed by blades extending radially outward on the rotor and for each of the rotor blade rings in one of the planes 150, 151, 152 and 153 lie.
  • the mounting plane of the rotor sleeve forms the plane 154.
  • the planes 150, 151, 152, 153 and 154 are spaced apart in the axial direction.
  • the pumping structures 111 and 112 cooperate and form a first pumping stage 110, which is arranged on the suction side and works in the high-vacuum range.
  • the pumping structures 115 and 116, 119 and 120, as well as 123 and 124 form further pumping stages 114, 118 and 122 for the middle pressure range.
  • Rotor sleeve 127 and Holweckstator 128 together form a Holweckcut.
  • the shaft carries the first rotor component 101, which comprises the blades of the rotor blade rings 119 and 123, advantageously the blades are integral components of the first rotor component.
  • the first rotor component also carries the rotor sleeve 127, which comprises a carbon fiber composite material.
  • the first rotor part has a recess 130. This extends in the axial and radial directions such that a cavity is formed. In these project parts of the housing 160 and the motor coil 161, so that a short length of the turbo pump is achieved.
  • a further advantage results from the fact that the rotor blade rings are adapted to the pressure range which lies between the pressure range for the Holweckpumpgrin and the high vacuum pumping stage.
  • the blade angles are flat, that is, the blade is only slightly inclined to the rotor blade ring plane. Together with the lower radial depth of the blade than in the high vacuum range, this allows cost-effective production by sawing channels into a cylindrical starting body.
  • the shaft carries on the high vacuum side facing the first rotor component, a first support ring 108 and a second support ring 109.
  • the first support ring carries the designed as a rotor blade ring pump structure of the first pumping stage 110, which is designed for the high vacuum pressure range. In the pressure range of these two pump stages, the blade angles are steeper, that is, the blade is more inclined than the pump stages 118 and 122 against the rotor blade ring plane. Therefore, manufacturing as a disc having a support ring and rotor blade ring is inexpensive and less restricted by the method of manufacture.
  • the limitation with multi-row design is that the machining tool must take into account the blades of the other rows when machining the blades of one row.
  • the design with a first rotor component and first and second support ring brings great benefits for the burst behavior with it. This is partly due to the fact that the size of the largest fragment in this construction compared to the completely one-piece bell is significantly reduced. On the other hand, higher-value, in particular firmer, starting materials for the rotor components can be used with the same starting price.
  • the timing of the burst is favorably influenced, since a forming crack in a component meets the limits of the next component. This results in a temporal extension, which leads to a reduction of the forces occurring at the same stored energy.
  • the burst behavior can be further improved by arranging a reinforcing ring between the first and second support ring and the second support ring and the first rotor component.
  • Holes 172 for balancing weights 173 between the rotor blade rings 119 and 123 are advantageously arranged. Together with bores 170 and balancing weights 171 in the end face of the shaft, the rotor can be balanced with easily accessible weights.
  • the first rotor part can have more than two rotor blade rings, and the number of bearing rings can be increased or reduced compared to the figure.
  • An inventive embodiment of a turbomolecular pump rotor is in a section along the axis of rotation in FIG. 2 shown.
  • This example relates to a turbomolecular pump equipped with active magnetic bearings.
  • a safety bearing 295 surrounding the shaft 232, a safety bearing 295, a radial bearing coil 291, a radial sensor 293 and the motor coil 261 are arranged.
  • the motor coil cooperates with the motor magnet 262 located on the shaft and secured by a sleeve 263, so that when the motor coil is energized, the shaft is set in rapid rotation.
  • the radial sensor cooperates with the shaft-side Radialsensortarget 294 and allows a magnetic bearing control electronics, not shown, the determination of the radial deflection of the rotor and thus the control of the radial bearing coil.
  • the turbomolecular pump of this example facing the fore-vacuum, has a Holweck stator 228 in which run helical channels which cooperate with the sleeve 227 arranged on the rotor and together form a Holweck stage 226.
  • stator disks 212, 216, 220 and 224 provided with blade rings which are axially spaced by spacer rings 213, 217, 221 and 225 arranged between them.
  • the pump structures designed as rotor blade rings 211, 215, 219 and 223 dip.
  • Dormant and rotor-side pump structures interact in pairs.
  • the rotor blade ring 211 forms with the stator 212 together the first, the chamber and working in a high vacuum pumping stage 210.
  • the rotor blade rings are each arranged in planes 250, 251, 252 and 253 axially spaced apart from each other, the mounting area of the rotor sleeve forms the plane 254.
  • the rotor-side pumping structures in the form of the rotor blade rings 219 and 223 are arranged on the first rotor part 201 and form with this a one-piece body.
  • the rotor sleeve 227 is connected to the first rotor part.
  • the first rotor part has a recess 230 in its center. This axially and radially extending from the center cavity takes the catch bearing at least partially, so that advantageously the overall length of the turbo pump is reduced.
  • the cavity can be increased so that the housing part 260, which includes radial bearing, radial sensor and motor coil, is located over part of its axial extent therein. This leads to a further reduction in the length of the turbopump extending in the direction of the rotor axis of symmetry.
  • the first rotor part is connected to a securing means, in the example of a screw 280, with the end face of the shaft 232.
  • the shaft has a recess with which a pin 289 of the first rotor part is engaged, whereby the radial positioning is simplified.
  • the first rotor part has a support portion 201a. This extends axially from the first rotor part in the direction of high vacuum, ie in the direction away from the shaft. On this support portion, a support ring 208 are arranged, with which the rotor blade ring 211 is connected. Another support ring 209 and the rotor blade ring 215 are also connected together.
  • the support rings with rotor blade ring are inexpensive to produce, for example, by sawing from solid material. For this purpose, inexpensive high-strength material is available.
  • the separation between the first rotor part and support rings increases the burst safety, in which the tearing of the component at this separation is delayed. In addition, the maximum size of the fragments is reduced.
  • a reinforcing ring 281 is provided, which is arranged so that it touches both support rings 208 and 209 on the surface and counteracts widening of the support rings in the radial direction by centrifugal forces.
  • a balancing bores 270 can be used in the balancing weights 271.
  • a very good balancing of the rotor is achieved with easy accessibility of balancing bores.
  • the first rotor part can have more than two rotor blade rings, and the number of bearing rings can be increased or reduced compared to the figure.
  • turbomolecular pump rotor is in a section along the axis of rotation in FIG FIG. 3 shown.
  • An alternative construction of the turbomolecular pump rotor without the other components of the turbopump is shown.
  • the turbomolecular pump rotor comprises a shaft 332, to the front side of which a first rotor part 301 is connected.
  • the shaft has a recess with which a pin 389 of the first rotor part is engaged, whereby the radial centering is effected.
  • the shaft is located with a portion of its length in a cavity 330 which extends from the axis of rotation of the first rotor part over part of the radius and in the axial direction. This cavity receives a portion of the other components of the turbo pump, for example parts of bearing and drive, whereby the overall length of the turbo pump is reduced.
  • the first rotor part has three rotor blade rings 319, 323 and 329 arranged in three planes 352, 353 and 354.
  • a second rotor part 302. On the side facing away from the shaft of the first rotor part is a second rotor part 302. This is centered by centering means 382 relative to the first rotor part.
  • the centering means is designed as a recess in the first rotor part, with which the second rotor part is engaged.
  • the second rotor part has a, the first rotor part facing away, high-vacuum-side recess 383, in which a screw 380 is arranged, which serves the secure connection of shaft, first and second rotor part.
  • the second rotor part comprises the rotor blade rings 311 and 315, which are arranged in the planes 350 and 351.
  • This construction also leads to a favorable behavior in the case of a burst due to the size of the resulting fragments.
  • An advantage of this arrangement is the small number of components, so that few parts are to be added.
  • the starting material is cheaper than in the case of a full bell, that is, a single body, which includes all rotor blade rings.
  • the number of rotor blade rings, which is arranged on each of the rotor parts, is greater than or equal to two, depending on the vacuum engineering design of the turbo pump.
  • turbomolecular pump rotor Yet another unclaimed example of a turbomolecular pump rotor is in a section along the axis of rotation in FIG FIG. 4 shown.
  • An alternative construction of the turbomolecular pump rotor without the other components of the turbopump is shown.
  • this turbomolecular pump rotor has a second rotor part 402 with an extension 402a.
  • the support rings 408 and 409 are arranged, which are positioned for example by shrinking or clamping.
  • the rotor blade ring 415 of the plane 451 is formed integrally with the support ring 409.
  • the rotor blade ring 411 located in the plane 450 is designed in one piece with the support ring 408.
  • the extension 402a surrounds the high-vacuum-side recess 483, in which a screw 480 is arranged.
  • the first rotor part has, on its side facing the shaft, a recess 430 which creates space for stator-side components, for example bearings and motor. This recess reduces the overall length of the turbo pump.
  • the construction of two parts and support rings improves the behavior in case of a burst very clearly.
  • Centering means are advantageously present as in the third example, which ensure a safe centering of the first and second rotor part to each other.
  • the design according to this example allows by designing with support rings great freedom in the choice of blade geometry of the rotor blade rings 411 and 415. In addition, a good centering of the support rings is achieved, so that the balancing behavior is improved.
  • Shaft and first rotor part Centered by a pin 489 to each other, which is in engagement with an end-side recess of the shaft.
  • the first rotor part can have more than two rotor blade rings, and the number of supporting rings can be increased or reduced in comparison with the figure.
  • turbomolecular pump rotor is in a section along the axis of rotation in FIG FIG. 5 shown.
  • An alternative construction of the turbomolecular pump rotor without the other components of the turbopump is shown.
  • the turbomolecular pump rotor shown in partial section has rotor blade rings 511, 515 and 519 disposed in the axially spaced planes 550, 551 and 552 and forming part of the first rotor part 501.
  • Each rotor blade ring as in the previous examples, has blades which extend radially and are turned against the direction of movement.
  • the first rotor part is connected by means of the screw 580 with an end face of the shaft 532. Shaft and first rotor part are centered by a pin 589 to each other, which is in engagement with an end-side recess of the shaft. With the fore vacuum-side end face 586 of the first rotor part, a second rotor part 502 is connected.
  • the centering of the first and second rotor part is achieved by means of a projection 597, which is in engagement with a recess of the first rotor part and located on the end face of the second rotor part.
  • a reinforcing ring 581 He is in a Recess arranged so that it advantageously has no effect on the gap between the rotor and stator.
  • the second rotor part comprises the pump structures arranged in the axially spaced-apart planes 553 and 554 in the form of a rotor blade ring 553 and a sleeve sleeve 584.
  • the first rotor part has a recess 530 which, together with the central through hole 588 of the second rotor part, forms a large cavity for receiving Bearing and engine components of the turbo pump results.
  • the turbomolecular pump rotor of this example combines a pronounced advantage of shortening the length with a very safe burst behavior, because even with this rotor, only small fragments are produced in the event of a burst.
  • the number of rotor blade rings on the second rotor part can be higher and can be dispensed with as needed on the Holweckhülse. This depends on the desired vacuum data.

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

Claims (5)

  1. Rotor de pompe turbomoléculaire comprenant une première (219) et une seconde structure de pompage (223), chaque structure de pompage étant apte et prévue pour former un étage de pompage avec une structure de pompage (220, 224) côté stator,
    dans lequel
    une première partie de rotor (201) comprend la première structure de pompage (219) et la seconde structure de pompage (223), et le rotor de pompage turbomoléculaire comprend une troisième structure de pompage (211, 215),
    la première structure de pompage (219) et la seconde structure de pompage (223) sont agencées sous forme de couronnes d'aubes de rotor sur la première partie de rotor (201),
    caractérisé en ce que
    la première structure de pompage (219) et la seconde structure de pompage (223) forment un corps d'un seul tenant avec la première partie de rotor (201), et en ce que
    la première partie de rotor (201) présente une portion de support (201a) sur laquelle sont disposés au moins deux anneaux porteurs (208, 209) ayant chacun une couronne d'aubes de rotor (219, 223) qui constituent la troisième structure de pompage (211, 215).
  2. Rotor de pompe turbomoléculaire selon la revendication 1,
    caractérisé en ce que
    la première partie de rotor (201) présente un évidement (230) qui se situe radialement à l'intérieur et qui s'étend en direction axiale.
  3. Rotor de pompe turbomoléculaire selon la revendication 1 ou 2,
    caractérisé en ce que
    un anneau de renforcement (281) est prévu entre les anneaux porteurs (208, 209).
  4. Pompe turbomoléculaire comportant un rotor de pompe turbomoléculaire selon l'une des revendications 1 à 3.
  5. Pompe turbomoléculaire selon la revendication 4,
    caractérisée en ce que
    elle comprend un palier magnétique actif radial (291, 292, 293, 294) et un palier magnétique actif axial.
EP10007376.6A 2009-08-01 2010-07-16 Rotor de pompe turbo-moléculaire Active EP2295813B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009035812A DE102009035812A1 (de) 2009-08-01 2009-08-01 Turbomolekularpumpenrotor

Publications (3)

Publication Number Publication Date
EP2295813A2 EP2295813A2 (fr) 2011-03-16
EP2295813A3 EP2295813A3 (fr) 2015-08-19
EP2295813B1 true EP2295813B1 (fr) 2019-09-18

Family

ID=43036975

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10007376.6A Active EP2295813B1 (fr) 2009-08-01 2010-07-16 Rotor de pompe turbo-moléculaire

Country Status (3)

Country Link
EP (1) EP2295813B1 (fr)
JP (1) JP2011033027A (fr)
DE (1) DE102009035812A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014100622A1 (de) * 2014-01-21 2015-07-23 Pfeiffer Vacuum Gmbh Verfahren zur Herstellung einer Rotoranordnung für eine Vakuumpumpe und Rotoranordnung für eine Vakuumpumpe

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3239328C2 (de) * 1982-10-23 1993-12-23 Pfeiffer Vakuumtechnik Magnetisch gelagerte Turbomolekularpumpe mit Schwingungsdämpfung
JPH0259294U (fr) * 1988-10-25 1990-04-27
DE10008691B4 (de) * 2000-02-24 2017-10-26 Pfeiffer Vacuum Gmbh Gasreibungspumpe
JP3792112B2 (ja) * 2000-09-06 2006-07-05 株式会社荏原製作所 真空ポンプ
JP3784250B2 (ja) * 2000-11-06 2006-06-07 株式会社荏原製作所 真空ポンプ
JP2002168249A (ja) * 2000-11-29 2002-06-14 Shimadzu Corp 回転機械
GB0229355D0 (en) * 2002-12-17 2003-01-22 Boc Group Plc Vacuum pumping arrangement
EP1517042A1 (fr) 2003-09-17 2005-03-23 Mecos Traxler AG Pallier magnétique pour une pompe à vide
GB0322889D0 (en) * 2003-09-30 2003-10-29 Boc Group Plc Vacuum pump
DE502004003752D1 (de) 2004-01-29 2007-06-21 Pfeiffer Vacuum Gmbh Gasreibungspumpe
DE202005019644U1 (de) * 2005-12-16 2007-04-26 Leybold Vacuum Gmbh Turbomolekularpumpe
DE102007048703A1 (de) * 2007-10-11 2009-04-16 Oerlikon Leybold Vacuum Gmbh Mehrstufiger Turbomolekularpumpen-Pumpenrotor
JP5087418B2 (ja) * 2008-02-05 2012-12-05 株式会社荏原製作所 ターボ真空ポンプ
DE102008056352A1 (de) * 2008-11-07 2010-05-12 Oerlikon Leybold Vacuum Gmbh Vakuumpumpenrotor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
DE102009035812A1 (de) 2011-02-03
EP2295813A3 (fr) 2015-08-19
JP2011033027A (ja) 2011-02-17
EP2295813A2 (fr) 2011-03-16

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