EP2194275B1 - Pompe à vide à lobes - Google Patents

Pompe à vide à lobes Download PDF

Info

Publication number
EP2194275B1
EP2194275B1 EP09014528.5A EP09014528A EP2194275B1 EP 2194275 B1 EP2194275 B1 EP 2194275B1 EP 09014528 A EP09014528 A EP 09014528A EP 2194275 B1 EP2194275 B1 EP 2194275B1
Authority
EP
European Patent Office
Prior art keywords
piston
shaft
vacuum pump
axis
roots vacuum
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.)
Not-in-force
Application number
EP09014528.5A
Other languages
German (de)
English (en)
Other versions
EP2194275A3 (fr
EP2194275A2 (fr
Inventor
Frank Hotopp
Siamak Dr. Rafii
Ronald Dr. Sachs
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 EP2194275A2 publication Critical patent/EP2194275A2/fr
Publication of EP2194275A3 publication Critical patent/EP2194275A3/fr
Application granted granted Critical
Publication of EP2194275B1 publication Critical patent/EP2194275B1/fr
Not-in-force 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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/126—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/28—Safety arrangements; Monitoring
    • 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
    • F04C2240/00—Components
    • F04C2240/20—Rotors
    • 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
    • F04C2240/00—Components
    • F04C2240/60—Shafts

Definitions

  • the invention relates to a Roots vacuum pump according to the preamble of the first claim.
  • Roots vacuum pumps are an indispensable part of many industrial applications. Examples of such applications include metallurgy, vacuum drying and chemical engineering.
  • Roots vacuum pumps provide to operate two waves in opposite directions at the same speed. This is ensured for example by a mechanical synchromesh.
  • pistons On these shafts are provided pistons which cooperate, trapping gas volumes and transferring them from the pump inlet to the pump outlet.
  • a well-known in the art construction principle proposes to make the piston of a metal material and to make it easier through drilled cavities. Through a central bore a steel shaft is inserted through and fixed, for example by gluing the components.
  • the GB 891 524 A describes a similar Roots pump in which channels are arranged in a piston.
  • An object of the invention is to provide a Roots vacuum pump with a cost-producible and stable piston.
  • a cavity is provided according to the invention. This reduces the weight of the piston while maintaining stability. A lower weight reduces the costs, at the same time it allows an increase in the shaft speed, since the mass distribution is cheaper. A lower weight also increases the smoothness of the Roots vacuum pump. It is therefore possible to increase the suction capacity over the prior art.
  • Roots pump is significantly simplified, since the shaft journal and piston are parts of a one-piece casting according to the invention. Furthermore, the interior of the piston is hollow and the cavity is designed to be comprehensive. This enhances the above-mentioned advantageous effects.
  • the stability of this arrangement is inventively increased by a longitudinal web between the shaft journal.
  • the weight is further reduced, in which two shaft journals are arranged on the piston, between which there is a cavity.
  • the piston wall can be made thin and with low material costs, if more webs are used for stiffening.
  • FIG. 1 A section along the axes of a Roots vacuum pump shows FIG. 1 ,
  • the pump chamber 2 In the housing 1 of the vacuum pump is the pump chamber 2. This is penetrated by a first shaft 10 and a second shaft 14. In the direction of the shaft axes, it is limited by a first end shield 4 and a second end shield 5.
  • a first piston 12 with the first shaft and second piston 16 are connected to the second shaft.
  • Both shafts are supported by bearing arrangements rotatably in the end shields.
  • the first bearing plate In the first bearing plate are the floating bearing 22 of the first shaft and the movable bearing 26 of the second shaft.
  • the second bearing plate In the second bearing plate are the fixed bearing 24 of the first shaft and the bearing 28 of the second shaft.
  • a gear chamber 3 On the side facing away from the pump chamber side of the first bearing plate, a gear chamber 3 is provided, in which protrude the ends of the first and second shaft. On the shaft ends sit a first and a second synchronous wheel 18 and 20, which transmit the rotation of the first waves to the second shaft, so that they rotate at the same speed but in opposite directions.
  • a first centrifugal disc 30 dips into a lubricant reservoir and distributes the lubricant in the gear compartment.
  • a gap 8 On the side facing away from the pump chamber side of the second bearing plate is a gap 8. This is penetrated by the first wave, while the second wave ends in him. At its end is a second centrifugal disk 32 arranged, which also immersed in a lubricant supply and causes a distribution of the lubricant in the intermediate space.
  • the intermediate space passing through the end of the first shaft terminates in the motor housing 6.
  • the shaft end with the inner magnet is surrounded by a split pot 40 which is mounted airtight by means of a split-top flange on the housing.
  • a magnetic carrier 48 carries outer magnets 46, which cooperate with the inner magnet force and rotation transmitting.
  • the magnet carrier is arranged on a motor shaft 50, which is mounted in an engine mount 52.
  • the motor magnets 54 also arranged on the motor shaft cooperate with coils 56 to convert electrical energy into mechanical rotation. Coils and motor magnets form the drive of the Roots pump.
  • FIG. 1 The pistons of FIG. 1 are shown there schematically and not cut. Both pistons, apart from the length of the motor-side shaft end, can be constructed identically. Therefore, the characteristics that result from the FIGS. 2 to 5 result, apply to both pistons.
  • the piston is designed as a hollow body. It has a piston wall 60 which surrounds the hollow interior.
  • Transverse webs 64 are oriented substantially perpendicular to the axis of rotation and arranged on the inner wall of the piston. They stiffen the rotor against occurring centrifugal forces. It is thus avoided that the piston wall bulges out at its point parallel to the axis 100 from the axis outwards and thereby consumes the narrow gaps between the piston with each other and the housing. Tighter gaps can be selected by the stiffening, which improves the vacuum technical performance of the Roots vacuum pump and a tarnishing of the piston, that is, a mutual contact or contact of the Housing, prevented.
  • Along the axis are located at the piston end integral with this executed shaft journals 62 and 63, which are provided to cooperate with the shaft bearings described above, synchronous wheels, the drive and the centrifugal discs.
  • the piston Inside the piston is located between the shaft journal and along the axis of the core portion 58. In this core region according to the invention, the cavity 80 is provided. Only edge webs 70 on the shaft journal and a longitudinal web 66 extending parallel to the axis on the inside of the piston wall are arranged in this region. The longitudinal bar stiffens the piston wall, so that here centrifugal forces can not develop a negative effect. An additional stiffening results from the central web 68. All webs 64, 66 and 68 make it possible to make the piston wall 60 as thin as possible and thus easy.
  • an outer opening 72 is provided in an axis perpendicular to the axis portion of the piston wall. Since the interior 82 of the piston constitutes an undivided cavity, the outer opening allows the piston with the shaft journals to be manufactured as a casting. This is a very cost effective design. Filling material, which keeps the interior of the piston free of material during casting, is removed through the outer opening. This opening is closed in the assembled Roots vacuum pump by a plug or the like. It is advantageous to provide a plurality of outer openings, preferably four, since this simplifies and clarifies the mounting of the casting core.
  • the piston has an approximately eight-shaped cross-section.
  • the piston wall 60 encloses the hollow interior of the piston.
  • To this hollow and undivided interior space 82 belongs the cavity 80 in the core area 58 of the piston.
  • the eight are provided on the inside of the piston wall, the stiffening longitudinal webs 66, the effect of which has been described above.
  • FIG. 4 A section along the axis and along the line II-II 'is in FIG. 4 shown. Between the shaft journals 62 and 63 is located in the interior of the piston, the cavity 80 which extends along the axis. Extending parallel to the axis 60 on the inside of the piston wall longitudinal webs 66. The central web 68 extends transversely to the axis and connects the longitudinal webs. As a result, the piston is stiffened to a high degree against the centrifugal forces. Likewise, the edge webs 70 cause a stiffening with this effect. Depending on the length of the piston, a plurality of central webs may be provided, wherein the interior of the piston preferably remains undivided, so that it can be produced as a one-piece cast part.
  • FIG. 5 A section along the line III-III 'at the level of the shaft journal 63 shows FIG. 5 ,
  • the outer opening 72 is provided, which connects the interior of the piston such that filling material of the casting process can be removed thereby.
  • a release structure 74 is provided in the piston wall.
  • Several radial webs 76 alternate in the circumferential direction with end openings 78. The front openings are closed with a soft material. In the case of a contact of the piston, for example, in a damage of the synchronizer wheels or by a occurred foreign body, the radial webs are deformed. Even the complete tearing of the radial webs is possible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Claims (4)

  1. Pompe à vide de Roots, comportant un arbre (10, 14), un piston (12, 16) relié à celui-ci, un entraînement (54, 56) mettant en rotation l'arbre et un palier d'arbre (22, 24, 26, 28),
    dans laquelle
    une pièce coulée d'un seul tenant comprend le piston (12, 16) et deux tourillons d'arbre (62, 63) agencés aux extrémités du piston (12, 16),
    caractérisée en ce que
    au moins une cavité (80) est prévue dans le piston (12, 16) et au moins une barrette longitudinale (66) est agencée entre les tourillons d'arbre (62, 63).
  2. Pompe à vide de Roots selon l'une des revendications précédentes,
    caractérisée en ce que
    le piston comprend un volume intérieur creux non divisé (82) qui comprend la cavité (80).
  3. Pompe à vide de Roots selon la revendication 2,
    caractérisée en ce que
    des barrettes (64, 66, 68) sont prévues dans le volume intérieur (82).
  4. Pompe à vide de Roots selon l'une des revendications précédentes,
    caractérisée en ce que
    entre le palier d'arbre (22, 24, 26, 28) et le piston (12, 16), elle comprend une structure de libération (74) dans laquelle plusieurs barrettes radiales (76) alternent avec des ouvertures frontales (78) en direction périphérique de l'arbre (10, 14).
EP09014528.5A 2008-12-04 2009-11-20 Pompe à vide à lobes Not-in-force EP2194275B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008060540A DE102008060540A1 (de) 2008-12-04 2008-12-04 Wälzkolbenvakuumpumpe

Publications (3)

Publication Number Publication Date
EP2194275A2 EP2194275A2 (fr) 2010-06-09
EP2194275A3 EP2194275A3 (fr) 2014-09-03
EP2194275B1 true EP2194275B1 (fr) 2018-08-22

Family

ID=41796160

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09014528.5A Not-in-force EP2194275B1 (fr) 2008-12-04 2009-11-20 Pompe à vide à lobes

Country Status (2)

Country Link
EP (1) EP2194275B1 (fr)
DE (1) DE102008060540A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2490517B (en) 2011-05-04 2017-12-13 Edwards Ltd Rotor for pump
DE102014104161A1 (de) * 2014-03-26 2015-10-01 Pfeiffer Vacuum Gmbh Wälzkolbenvakuumpumpe
DE102014107536A1 (de) 2014-05-28 2015-12-03 Pfeiffer Vacuum Gmbh Vakuumpumpe
EP3064775B1 (fr) 2015-03-02 2022-01-26 Pfeiffer Vacuum GmbH Pompe à vide et procédé de détection d'un contact entre au moins un rotor et un stator d'une pompe à vide
GB2571792B (en) * 2018-03-09 2020-12-16 Edwards Ltd A vacuum pump with a pressure relief valve
US11815095B2 (en) * 2019-01-10 2023-11-14 Elival Co., Ltd Power saving vacuuming pump system based on complete-bearing-sealing and dry-large-pressure-difference root vacuuming root pumps

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2048249A (en) * 1933-08-22 1936-07-21 Adolf Schnurle Rotary piston machine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE882746C (de) * 1941-04-11 1953-07-13 Auto Union A G Roots-Geblaese mit aus Leichtmetall bestehenden, mit Stahlwellen versehenen Laeufern
GB809445A (en) * 1954-02-27 1959-02-25 Heraeus Gmbh W C Improvements in or relating to rotary high vacuum pumps
GB891524A (en) * 1957-04-08 1962-03-14 Expl Du Generatuer A Piston Li Improved pumps, motors and driving units of the rotor type
US3302868A (en) * 1964-04-02 1967-02-07 Leybolds Nachfolger E Fluid handling apparatus for use as vacuum pump
JP3836160B2 (ja) * 1998-02-13 2006-10-18 株式会社荏原製作所 真空ポンプ用ロータ及びその製造方法
GB0228641D0 (en) * 2002-12-06 2003-01-15 Adams Ricardo Ltd Improvements in or relating to rotors for rotary machines

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2048249A (en) * 1933-08-22 1936-07-21 Adolf Schnurle Rotary piston machine

Also Published As

Publication number Publication date
EP2194275A3 (fr) 2014-09-03
DE102008060540A1 (de) 2010-06-10
EP2194275A2 (fr) 2010-06-09

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