EP0406873A2 - Pompe à vide avec sécurité contre aération de récipient à l'arrêt - Google Patents

Pompe à vide avec sécurité contre aération de récipient à l'arrêt Download PDF

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Publication number
EP0406873A2
EP0406873A2 EP90112881A EP90112881A EP0406873A2 EP 0406873 A2 EP0406873 A2 EP 0406873A2 EP 90112881 A EP90112881 A EP 90112881A EP 90112881 A EP90112881 A EP 90112881A EP 0406873 A2 EP0406873 A2 EP 0406873A2
Authority
EP
European Patent Office
Prior art keywords
pump
oil
gas
backing
auxiliary
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.)
Withdrawn
Application number
EP90112881A
Other languages
German (de)
English (en)
Other versions
EP0406873A3 (en
Inventor
Rudolf Dr. Lachenmann
Gerhard Rüster
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.)
Vacuubrand GmbH and Co KG
Original Assignee
Vacuubrand GmbH and Co KG
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 Vacuubrand GmbH and Co KG filed Critical Vacuubrand GmbH and Co KG
Publication of EP0406873A2 publication Critical patent/EP0406873A2/fr
Publication of EP0406873A3 publication Critical patent/EP0406873A3/de
Withdrawn legal-status Critical Current

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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
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/02—Liquid sealing for high-vacuum pumps or for compressors

Definitions

  • the invention is based, an oil-sealed backing pump, z. B. equip a rotary vane pump with the simplest means so that no gas or oil flows back into the evacuated apparatus when the pump is switched off or when the pump stops unintentionally.
  • each oil-sealed backing pump produces a loud noise when its final pressure is reached, which is caused by the incompressibility of the oil in the pump head chamber, which is completely degassed in this operating state (oil blow).
  • a very small amount of gas (air) is constantly flowing into the scooping chamber, for example through a nozzle.
  • the vacuum pump is very sensitive to this amount of gas: if it is somewhat too large, if the desired final vacuum is not reached, if it is somewhat too small, the oil hammer will not be eliminated.
  • this gas supply In order to seal the vacuum pump at a standstill, this gas supply must also be shut off in addition to the oil supply, which significantly reduces the simplicity of the atmosphere-side solution.
  • the oil level in the storage room must be at a certain level, because otherwise the distance between the oil intake opening and the oil level, and thus the gas content in the intake oil, will fluctuate, because the gas bubbles entered naturally collect just below the oil level, while the oil remains almost gas-free further below the surface.
  • An exact dosage of the gas quantity with fluctuating oil level is with this Measure therefore not possible, i.e. a pump equipped in this way cannot have a large, usable oil supply. However, this is increasingly required today.
  • Another known solution uses an auxiliary pump for the oil supply of the backing pump, which simultaneously sucks in gas and oil via a suction opening.
  • the proportion of gas depends very much on the oil viscosity and thus on the operating temperature of the backing pump and fluctuates with it within wide limits. Such a solution is therefore also unsatisfactory.
  • An auxiliary pump 2 is arranged on the shaft of the vacuum pump 1, which is preferably designed as a rotary vane pump with at least three vanes 3.
  • the auxiliary pump has two suction openings, one for gas 4 (air), which ends above the highest oil level in the oil reservoir, and one for oil 5, which ends below the lowest oil level.
  • the auxiliary pump has an ejection opening (6) which opens into the pumping chamber of the vacuum pump, a spring-loaded valve 7 being arranged between the auxiliary pump and the pumping chamber, which valve opens only at a pressure difference of more than 1 bar.
  • the pumping chamber of the auxiliary pump is designed and the position of the two suction openings is selected so that the auxiliary pump first draws in a small amount of air and then fills its pumping chamber with oil.
  • oil and gas are mixed intensively and pressed together via the spring-loaded valve 7 into the pump chamber of the vacuum pump.
  • the spring-loaded valve 7 closes and seals the vacuum pump at this point.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
EP19900112881 1989-07-07 1990-07-05 Vacuum pump with security against aeration of recipient at stoppage Withdrawn EP0406873A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3922417 1989-07-07
DE19893922417 DE3922417A1 (de) 1989-07-07 1989-07-07 Vakuumpumpe mit sicherung gegen belueftung des rezipienten bei stillstand

Publications (2)

Publication Number Publication Date
EP0406873A2 true EP0406873A2 (fr) 1991-01-09
EP0406873A3 EP0406873A3 (en) 1991-11-27

Family

ID=6384524

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900112881 Withdrawn EP0406873A3 (en) 1989-07-07 1990-07-05 Vacuum pump with security against aeration of recipient at stoppage

Country Status (2)

Country Link
EP (1) EP0406873A3 (fr)
DE (1) DE3922417A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997004236A1 (fr) * 1995-07-19 1997-02-06 Leybold Vakuum Gmbh Pompe a vide a palettes rendue etanche a l'huile, avec alimentation en huile

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4325281A1 (de) * 1993-07-28 1995-02-02 Leybold Ag Vakuumpumpe mit einer Gasballasteinrichtung
US5458679A (en) * 1993-12-10 1995-10-17 Minerals Technologies, Inc. Treatment of inorganic filler material for paper with polysaccharides
DE19526321A1 (de) * 1995-07-19 1997-01-23 Leybold Ag Ölgedichtete Drehschiebervakuumpumpe mit Ölpumpe

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1190134B (de) * 1957-02-07 1965-04-01 Edwards High Vacuum Ltd Drehkolben-Vakuumpumpe mit oelueberlagertem Auspuffventil
DE1703592A1 (de) * 1968-06-14 1971-11-18 Leybold Heraeus Gmbh & Co Kg Vakuum-Drehschieberpumpe
DD228008A1 (de) * 1984-10-02 1985-10-02 Medizin Labortechnik Veb K Einstellvorrichtung fuer eine oelpumpe zur druckoelschmierung von rotierenden vakuumpumpen
DD256540A1 (de) * 1986-12-30 1988-05-11 Medizin Labortechnik Veb K Druckoelschmierung fuer drehschieber-vakuumpumpen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997004236A1 (fr) * 1995-07-19 1997-02-06 Leybold Vakuum Gmbh Pompe a vide a palettes rendue etanche a l'huile, avec alimentation en huile
US6019585A (en) * 1995-07-19 2000-02-01 Leybold Vakuum Gmbh Oil-sealed vane-type rotary vacuum pump with oil feed
CN1079505C (zh) * 1995-07-19 2002-02-20 莱博尔德真空技术有限责任公司 带供油系统的油密性旋转滑片式真空泵

Also Published As

Publication number Publication date
DE3922417A1 (de) 1991-01-17
EP0406873A3 (en) 1991-11-27
DE3922417C2 (fr) 1991-08-29

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