EP2194276B1 - Pompe à vide à deux arbres - Google Patents

Pompe à vide à deux arbres Download PDF

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Publication number
EP2194276B1
EP2194276B1 EP09014529.3A EP09014529A EP2194276B1 EP 2194276 B1 EP2194276 B1 EP 2194276B1 EP 09014529 A EP09014529 A EP 09014529A EP 2194276 B1 EP2194276 B1 EP 2194276B1
Authority
EP
European Patent Office
Prior art keywords
shaft
piston
vacuum pump
pistons
release structure
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
EP09014529.3A
Other languages
German (de)
English (en)
Other versions
EP2194276A3 (fr
EP2194276A2 (fr
Inventor
Frank Hotopp
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 EP2194276A2 publication Critical patent/EP2194276A2/fr
Publication of EP2194276A3 publication Critical patent/EP2194276A3/fr
Application granted granted Critical
Publication of EP2194276B1 publication Critical patent/EP2194276B1/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
    • 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
    • F04C29/005—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C29/0071—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
    • 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

Definitions

  • the invention relates to a vacuum pump according to the first claim.
  • Two-shaft vacuum pumps have become an indispensable part of many industrial applications.
  • Metallurgy, vacuum drying and chemical engineering are examples of these applications.
  • the basic structure of these vacuum pumps is to operate two shafts in opposite directions at the same speed. This is ensured, for example, by a mechanical synchromesh gear. Pistons are provided on these shafts which cooperate, enclose gas volumes and transfer them from the pump inlet to the pump outlet.
  • the DE 3411931 A1 discloses a Roots blower which is used as a compressor or supercharger. Similar items are also by the EP 209788 A2 and JP S59 160084 A known. An arrangement for transmitting a Torque is that WO 97/12158 A1 refer to.
  • the DE 810419 C discloses a positive displacement blower and the US 3558246 A discloses a Roots pump for viscous fluids.
  • the JP S-59-160084 and the EP 1 793 080 A1 each disclose a vacuum pump with the features of the respective preamble of claims 1 and 2.
  • twin-shaft vacuum pumps such as claw, screw or Roots pumps
  • a moment is introduced into the bearings when the pistons come into contact.
  • the core idea of the invention is to provide a release structure between the point of torque introduction, namely the piston surfaces in contact, and the shaft bearings. This interrupts the flow of torque by allowing the piston and shaft to rotate relative to one another. The torques are therefore transferred to the bearings to a significantly reduced extent and consequently to a reduced extent to the housing. This significantly increases the safety when the pistons come into contact.
  • the release structure comprises a clamping ring and a sleeve-like extension.
  • the shaft and piston are made from one piece or are connected to one another in a materially bonded manner (not according to the invention).
  • a deformation zone in at least one of the pistons as a further development of the invention brings about a further increase in safety.
  • kinetic energy is also reduced through plastic deformation, so that the moments transferred to the bearings are also reduced.
  • a section along the axes of a Roots vacuum pump shows Figure 1 .
  • the pump chamber 2 is located in the housing 1 of the vacuum pump.
  • a first shaft 10 and a second shaft 14 pass through it. In the direction of the shaft axes it is through a first end shield 4 and a second end shield 5 limited.
  • a first piston 12 is connected to the first shaft and a second piston 14 is connected to the second shaft.
  • Both shafts are rotatably supported by bearing arrangements in the end shields.
  • the floating bearing 22 of the first shaft and the floating bearing 26 of the second shaft are located in the first end shield.
  • the fixed bearing 24 of the first shaft and the fixed bearing 26 of the second shaft are located in the second end shield.
  • a gear chamber 3 On the side of the first end shield facing away from the pump chamber, a gear chamber 3 is provided, into which the ends of the first and second shaft protrude.
  • a first centrifugal disk 30 is immersed in a lubricant supply and distributes the lubricant in the gear compartment.
  • a second centrifugal disk 32 is arranged at its end, which is also immersed in a lubricant supply and causes the lubricant to be distributed in the space.
  • the end of the first shaft penetrating the intermediate space ends in the motor housing 6.
  • internal magnets 44 are attached to the shaft end.
  • the shaft end with the inner magnets is surrounded by a containment can 40 which is attached to the housing in an airtight manner by means of a containment can flange.
  • a magnet carrier 48 carries external magnets 46 which cooperate with the internal magnets in a force and rotation-transmitting manner.
  • the magnet carrier is on a motor shaft 50, which is mounted in an engine mount 52.
  • the motor magnets 54 which are also arranged on the motor shaft, interact with coils 56 in order to convert electrical energy into mechanical rotation.
  • the shaft 14 is arranged in a central bore of the piston 16 in the sectional view.
  • the shaft has a groove 61 which faces a groove 62 on the piston.
  • a bolt 60 is inserted into the two grooves 61 and 62 and forms a form fit.
  • This bolt is designed so that it can withstand the forces that occur when accelerating from a standstill and braking into a standstill.
  • the pin deforms and subsequently allows the piston and shaft to rotate relative to one another.
  • the bolt shears off completely at high forces.
  • the piston 76 has a sleeve-like extension 70. Its inside is pressed onto the shaft 74 by means of a clamping ring 71 that is closed in its circumferential direction. The resulting frictional connection is canceled when high forces are introduced into the piston. The limit of the clamping forces is such that the position of the piston and shaft remains unchanged when accelerating from standstill and braking to standstill. Only forces introduced into the piston, which do not occur when the pump is used as intended, will break the connection.
  • FIG. 5 Another way is in Figure 5 shown.
  • Shaft 94 and piston 96 are designed in one piece.
  • the piston has a large cavity inside.
  • the shaft is surrounded by a ring of bores 95 which is formed in a thin wall piece of the piston wall.
  • Thin wall piece and holes form a weakened point and thus the release structure.
  • the strength of the material, the thickness of the thin wall piece and the size and number of the bores are selected according to the criteria described above. Exceptional forces are absorbed by deformation so that they are not introduced into the fixed and floating bearings.
  • the material of the thin wall piece can be selected so that the stated conditions for the release structure are satisfied.
  • the choice of material and holes can be used alone or in combination with one another.
  • FIG. 6 shows the example of a deformation zone 107. This is provided near the surface of the piston 106 arranged on the shaft 104. It comprises at least one or a plurality of bores 108. When the pistons come into contact, the bores are compressed and the material located between the bores is deformed. Here, kinetic energy is reduced.
  • the number and size of the bores is such that the deformation of the surface due to centrifugal forces is so small that the gaps between the pistons and between the piston and housing are not torn open. They are also sized so that when they touch the piston a plastic deformation of the deformation zone is achieved.
  • material can be used in the deformation zone with which a plastic deformation is achieved according to the aspects mentioned with regard to the bores.
  • This deformation absorbs part of the energy released upon contact, so that the moments and forces transmitted to the shaft and its bearing are reduced.
  • the bores can be closed at the front in a further development.
  • the deformation zone is particularly effective with vacuum pumps whose pistons do not follow the toothing law, for example Roots vacuum pumps.

Landscapes

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

Claims (3)

  1. Pompe à vide comprenant un premier arbre (10), un premier piston (12) relié à celui-ci, un deuxième arbre (14), un deuxième piston (16) relié à celui-ci, un entraînement (54, 56) qui met en rotation au moins un arbre, et au moins un palier (22, 24, 26, 28) pour supporter en rotation un arbre,
    une structure de libération étant prévue entre le piston et l'arbre, qui est réalisée de telle sorte que lors de l'apparition de forces anormales caractéristiques pour un contact physique des pistons entre eux ou avec un boîtier de la pompe, une rotation du piston et de l'arbre l'un par rapport à l'autre est permise,
    caractérisée en ce que
    la structure de libération comprend une bague de serrage (71) et un prolongement (70) en forme de douille.
  2. Pompe à vide selon la revendication 1,
    caractérisée en ce que
    au moins un piston (12, 16 ; 76 ; 86 ; 96 ; 106) présente une zone de déformation (107).
  3. Pompe à vide selon la revendication 1 ou 2,
    caractérisée en ce que
    la structure de libération comprend une connexion entre l'arbre (10, 14 ; 74 ; 84) et le piston (12, 16 ; 76 ; 86) conçue de telle sorte que la connexion est libérée lors d'un contact physique des pistons.
EP09014529.3A 2008-12-04 2009-11-20 Pompe à vide à deux arbres Active EP2194276B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008060539A DE102008060539A1 (de) 2008-12-04 2008-12-04 Zweiwellige Vakuumpumpe

Publications (3)

Publication Number Publication Date
EP2194276A2 EP2194276A2 (fr) 2010-06-09
EP2194276A3 EP2194276A3 (fr) 2014-08-27
EP2194276B1 true EP2194276B1 (fr) 2020-09-09

Family

ID=41796156

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09014529.3A Active EP2194276B1 (fr) 2008-12-04 2009-11-20 Pompe à vide à deux arbres

Country Status (2)

Country Link
EP (1) EP2194276B1 (fr)
DE (1) DE102008060539A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4662826A (en) * 1984-04-20 1987-05-05 Tokico Ltd. Vacuum pump system including serially connected rotary and reciprocating vacuum pumps
DE19807923A1 (de) * 1997-03-03 1998-11-12 Luk Fahrzeug Hydraulik Kompressor für eine Klimaanlage eines Kraftfahrzeugs
US6068452A (en) * 1997-03-21 2000-05-30 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Torque limiting mechanism
EP1719929A1 (fr) * 2004-02-10 2006-11-08 Valeo Thermal Systems Japan Corporation Dispositif de transmission de couple d un compresseur
EP1793080A1 (fr) * 2005-12-02 2007-06-06 Pfeiffer Vacuum Gmbh Méthode d'utilisation d'une pompe de vide

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE810419C (de) * 1949-01-01 1951-08-09 Otto Becker Drehkolbengeblaese
FR96392E (fr) * 1968-11-07 1972-06-16 Eisenwerke Kaiserslautern G M Pompe a pistons rotatifs pour produits visqueux.
JPS59160084A (ja) * 1983-03-02 1984-09-10 Nippon Denso Co Ltd 回転式流体圧送装置
JPS6075793A (ja) * 1983-09-30 1985-04-30 Aisin Seiki Co Ltd ル−ツ型ブロア
JPH0623753Y2 (ja) * 1985-07-26 1994-06-22 トヨタ自動車株式会社 ル−ツ式ポンプ
WO1997012158A1 (fr) * 1995-09-28 1997-04-03 Muellenberg Ralph Systeme permettant de transmettre un moment de rotation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4662826A (en) * 1984-04-20 1987-05-05 Tokico Ltd. Vacuum pump system including serially connected rotary and reciprocating vacuum pumps
DE19807923A1 (de) * 1997-03-03 1998-11-12 Luk Fahrzeug Hydraulik Kompressor für eine Klimaanlage eines Kraftfahrzeugs
US6068452A (en) * 1997-03-21 2000-05-30 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Torque limiting mechanism
EP1719929A1 (fr) * 2004-02-10 2006-11-08 Valeo Thermal Systems Japan Corporation Dispositif de transmission de couple d un compresseur
EP1793080A1 (fr) * 2005-12-02 2007-06-06 Pfeiffer Vacuum Gmbh Méthode d'utilisation d'une pompe de vide

Also Published As

Publication number Publication date
EP2194276A3 (fr) 2014-08-27
EP2194276A2 (fr) 2010-06-09
DE102008060539A1 (de) 2010-06-10

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