EP2196671B1 - Pompe à vide à piston - Google Patents

Pompe à vide à piston Download PDF

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Publication number
EP2196671B1
EP2196671B1 EP09014531.9A EP09014531A EP2196671B1 EP 2196671 B1 EP2196671 B1 EP 2196671B1 EP 09014531 A EP09014531 A EP 09014531A EP 2196671 B1 EP2196671 B1 EP 2196671B1
Authority
EP
European Patent Office
Prior art keywords
piston
bushing
vacuum pump
seal
liner
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
EP09014531.9A
Other languages
German (de)
English (en)
Other versions
EP2196671A3 (fr
EP2196671A2 (fr
Inventor
Stefan Kallenborn
Ronald Dr. Sachs
Heiko Schäfer
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 EP2196671A2 publication Critical patent/EP2196671A2/fr
Publication of EP2196671A3 publication Critical patent/EP2196671A3/fr
Application granted granted Critical
Publication of EP2196671B1 publication Critical patent/EP2196671B1/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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
    • F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
    • F04B37/14—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • F04B39/064—Cooling by a cooling jacket in the pump casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/126—Cylinder liners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F04B53/143—Sealing provided on the piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/166—Cylinder liners

Definitions

  • the invention relates to a piston vacuum pump according to the preamble of the first claim.
  • Reciprocating vacuum pumps for generating coarse and fine vacuums are known in the prior art.
  • a dry runner i. without lubricants and sealants in the area of the pump chamber
  • They are successful on the market due to their properties, for example their high suction capacity for light gases.
  • the reciprocating piston of such a piston vacuum pump performs a reciprocating motion in a bushing.
  • a gasket contacting this bushing seals the gap between the piston and the bush. This seal is subject to wear, which is increased by the freedom of lubricant.
  • the DE 101 09 514 C1 describes a similar piston vacuum pump.
  • the coolant which is in heat transferring contact with the bushing, absorbs heat from the bushing. This heat is created by the friction of the seal on the liner wall. The removal of heat leads to a cooling of the bushing and the seal. As a result, the service life of the seal is significantly extended. At the same time, the service intervals of the piston vacuum pump are extended.
  • the cooling means comprises a closed circuit, comprising an evaporator and a condenser, in which the evaporator is in contact with the bushing.
  • a closed circuit comprising an evaporator and a condenser, in which the evaporator is in contact with the bushing.
  • this can be structurally particularly simple in that the bushing has a tangential bore in which the evaporator is arranged. This allows easy manufacture of the parts and easy assembly. The evaporator receives a very good thermal contact with the Bushing, so that a good heat dissipation and the life of the seal is significantly increased.
  • the cooling means comprises a heat-conducting body, which has a higher thermal conductivity than a cylinder accommodating the bushing.
  • the cooling means comprises a coolant channel, which is arranged in a cylinder receiving the bush, such that the bushing has its boundary surface facing it limited to the channel. In such a channel flows a heat receiving fluid, such as cooling water. Due to the claimed design, the fluid comes into direct contact with the liner, so that an excellent heat transfer is ensured. This results in a very good life extension.
  • a cylinder 20 With the housing, a cylinder 20 is connected gas-tight, which receives a bush 22.
  • the liner is fitted over a portion of its longitudinal axis with a shrink fit in the bore of the cylinder.
  • a reciprocating piston 24 In the bushing is a reciprocating piston 24 which is connected via a connecting rod 26 with the crank pin. Through this connection, the reciprocating piston performs a periodic movement.
  • the crankshaft drive, crankshaft pulley and crankpin causes reciprocating movement between two turning points.
  • the first turning point 27 is located between the end of the crankcase facing the crank chamber and gas inlet holes 28 which are provided distributed over the circumference of the bushing and establish a gas connection to the inlet channel 30.
  • This inlet channel surrounds the bushing at least in sections in the circumferential direction and in turn is in gas communication with the pump gas inlet 32.
  • the second turning point 33 is located near the end of the bushing facing away from the crank space. It is so dimensioned that the piston contacts the valve cover 34 and lifts off from the end of the bushing. This end of the bushing forms the valve seat on which the valve cover sits in the other phases of Hubkolbenhubes.
  • the valve cover is provided with a layer 36 which causes a damping of the contact of the valve cover and the piston and a seal.
  • the valve cover is biased by a valve spring 38 in the direction of bushing.
  • a seal 48 is arranged between sleeve wall and reciprocating piston. This seals the gap between bushing and piston and thus the suction chamber against the crank chamber. This seal is subject to wear due to friction on the inner liner wall.
  • a heat conducting body 50 is in heat transferring contact with the bushing.
  • the material of this has a higher thermal conductivity than the material of the bushing receiving cylinder.
  • an aluminum alloy is used for the cylinder.
  • As a material for the heat-conducting copper is suitable. Other materials with even higher thermal conductivity than copper can be used advantageously.
  • the heat-conducting body forms a heat connection between the bushing and the space outside the cylinder. It can be cooled by convection of the ambient air or by thermal contact with an external cooling circuit, not shown.
  • the claimed embodiment of the piston vacuum pump is in Fig.2 shown in a section perpendicular to the piston axis through the cylinder. Compared to the first embodiment, the area of the cylinder is changed.
  • the cylinder 220 surrounds the bush 222.
  • a through hole 224 is provided, which connects the surface of the cylinder with the bushing.
  • a bore 226 is provided in the bushing.
  • Bore and through hole partially receive a heat pipe 230.
  • the heat pipe has an evaporator 232 at the end of the evaporator and a condenser 234 at the end of the condenser.
  • the heat pipe contains a fluid which changes from a liquid to a gaseous state in the evaporator. It absorbs heat from the liner. In the inner part 236 of the heat pipe, the vaporized fluid is supplied to the condenser end.
  • the inner part may be a cavity
  • a porous structure is used for the outer part 238, which causes the conveyance of the fluid with capillary forces.
  • the Konsendatorende is located outside the cylinder and is in contact with a heat sink 240 in such a way that it absorbs the heat from the condenser end and radiates to the environment. If a convection cooling of the heat sink is not sufficient, the temperature of the leaf bushing to the desired extent to lower, the condenser end or the heat sink is forcibly cooled. This is possible with a fan or by connecting with coolants, for example with the heat exchanger of a cooling water circuit.
  • FIG. 3 An unclaimed embodiment is in Fig. 3 shown. Compared to the other embodiments, the area of the cylinder is changed. Engine, crank mechanism and housing correspond to the previous embodiments. In this figure, the cylinder arrangement is shown in a section along the cylinder axis. The piston 324 moves within the bushing 322 received by the cylinder 320 between the first turning point 327 and the second turning point 333.
  • the inlet bore 328 through which gas passes from the inlet channel 330 connected to the vessel to be evacuated or another pumping stage into the suction chamber 340.
  • the inlet channel forms an annular space surrounding the bushing.
  • the piston lifts the valve cover 334 provided with the valve layer 336 against the spring force of the valve spring 338 from the valve seat, so that the compressed gas is expelled from the pump chamber.
  • the valve arrangement is arranged in the cylinder cover 346. Between the piston and liner seals the seal 348, so that no gas can escape the pump chamber via the gap between the piston and sleeve.
  • the bushing has a bushing coating 323 on the side in contact with the seal.
  • an annular coolant passage 350 surrounds the bushing.
  • the piston speed is greatest, as far as a crank mechanism according to the first embodiment is used.
  • the coolant channel circulates a fluid which receives heat from the liner, for example, cooling water, which has a temperature equal to or below the room temperature. So that the heat transfer takes place in the best possible way, the fluid comes directly into contact with the outer wall of the liner.
  • the coolant thus comprises a coolant channel 350, which is arranged in such a cylinder receiving the bushing, that the bushing limits the boundary surface of the channel facing it.
  • a seal 352 is arranged between coolant channel 350 and inlet channel 330. Another seal 360 seals the gap between the bushing and the cylinder and thus the coolant channel against the outlet chamber 342.
  • the fluid is fed via a coolant inlet 354 into the coolant channel and then discharged to the coolant outlet 356.
  • Coolant inlet and outlet are part of a cooling water installation in a simple design.
  • the coolant is separated from the coolant inlet and the coolant outlet and transfers the heat to the latter via a heat exchanger. Between heat exchanger and coolant then a circulation pump is additionally provided.

Landscapes

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

Claims (4)

  1. Pompe à vide à piston (1) comportant une douille (22 ; 222 ; 322 ; 422), un piston alternatif (24 ; 224 ; 324 ; 424) agencé mobile dans la douille, un joint d'étanchéité (48) agencé sur le piston alternatif pour étancher l'espace entre le piston alternatif et la douille, et un entraînement qui provoque un mouvement périodique du piston alternatif,
    caractérisée en ce que
    un moyen de refroidissement (230) est en contact de transfert thermique avec la douille, en ce que le moyen de refroidissement (230) comprend un circuit fermé comprenant un évaporateur (232) et un condenseur (234), et en ce que l'évaporateur (232) est en contact avec la douille (22 ; 222 ; 322 ; 422).
  2. Pompe à vide à piston (1) selon la revendication 1,
    caractérisée en ce que
    le moyen de refroidissement (230) comprend un corps de refroidissement (240) qui est en contact avec une extrémité du condenseur (234).
  3. Pompe à vide à piston (1) selon la revendication 1 ou 2,
    caractérisée en ce que
    la douille présente un perçage tangentiel (226) dans lequel est agencé l'évaporateur (232).
  4. Pompe à vide à piston (1) selon l'une des revendications précédentes, caractérisée en ce que
    le moyen de refroidissement (230) est agencé à mi-chemin entre un premier point d'inversion (27 ; 327) et un second point d'inversion (33 ; 333) du mouvement périodique.
EP09014531.9A 2008-12-11 2009-11-20 Pompe à vide à piston Active EP2196671B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008061897A DE102008061897A1 (de) 2008-12-11 2008-12-11 Kolbenvakuumpumpe

Publications (3)

Publication Number Publication Date
EP2196671A2 EP2196671A2 (fr) 2010-06-16
EP2196671A3 EP2196671A3 (fr) 2016-07-06
EP2196671B1 true EP2196671B1 (fr) 2018-01-24

Family

ID=41401624

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09014531.9A Active EP2196671B1 (fr) 2008-12-11 2009-11-20 Pompe à vide à piston

Country Status (2)

Country Link
EP (1) EP2196671B1 (fr)
DE (1) DE102008061897A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014201473A1 (de) 2014-01-28 2015-07-30 Neuman & Esser Gmbh & Co. Kg Kolbenstange für kolbenkompressoren und kolbenkompressor
EP3067560B1 (fr) 2015-03-12 2020-11-18 Pfeiffer Vacuum GmbH Pompe à vide dotée d'au moins un étage
DE102022106046A1 (de) 2022-03-16 2023-09-21 Knf Neuberger Gmbh Pumpe mit einer Druckkammer und einem Kühlsystem
DE102022125508A1 (de) 2022-10-04 2024-04-04 Technische Universität Dresden, Körperschaft des öffentlichen Rechts Dichtsystem für eine Vorrichtung zum Verdichten eines Fluids und Vorrichtung zum Verdichten eines Fluids mit dem Dichtsystem

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR332224A (fr) * 1903-05-19 1903-10-19 Henry Bland Perfectionnements dans les compresseurs
GB293605A (en) * 1927-09-28 1928-07-12 Sidney Zaleski Hall Improvements in air compressors and vacuum pumps
DE577185C (de) * 1931-02-07 1933-05-30 Rudolf Pawlikowski Dipl Ing Zylinderbauart fuer Brennkraftmaschinen
DE1190959B (de) * 1961-02-17 1965-04-15 Linde Eismasch Ag Kaeltemittelkolbenverdichter mit gekuehlter Zylinderwandung
JPS5857092A (ja) * 1981-10-01 1983-04-05 Honda Motor Co Ltd エアポンプ装置
US5921755A (en) * 1997-04-21 1999-07-13 Dry Vacuum Technologies, Inc. Dry vacuum pump
DE19847159C2 (de) * 1998-10-13 2001-12-06 Hans Unger Kompressor zur Erzeugung ölfreier Druckluft
DE10109514C1 (de) * 2001-02-28 2002-07-11 Knorr Bremse Systeme Trockenlaufender Kolbenverdichter (Kurbeltriebschmierung)
DE102004061224B4 (de) * 2004-12-20 2010-09-09 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Kolben-Zylinder-Anordnung, insbesondere für einen Taumelscheibenverdichter
DE102006012532A1 (de) 2006-03-18 2007-09-20 Pfeiffer Vacuum Gmbh Dichtungsanordnung für eine Hubkolbenvakuumpumpe

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
EP2196671A3 (fr) 2016-07-06
EP2196671A2 (fr) 2010-06-16
DE102008061897A1 (de) 2010-06-17

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