EP1130263A2 - Pompe à vide à engrenages helicoidaux - Google Patents

Pompe à vide à engrenages helicoidaux Download PDF

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Publication number
EP1130263A2
EP1130263A2 EP01301502A EP01301502A EP1130263A2 EP 1130263 A2 EP1130263 A2 EP 1130263A2 EP 01301502 A EP01301502 A EP 01301502A EP 01301502 A EP01301502 A EP 01301502A EP 1130263 A2 EP1130263 A2 EP 1130263A2
Authority
EP
European Patent Office
Prior art keywords
pump
vacuum pump
rotors
rotor
threads
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Withdrawn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
EP01301502A
Other languages
German (de)
English (en)
Other versions
EP1130263A3 (fr
Inventor
Michael Henry North
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.)
BOC Group Ltd
Original Assignee
BOC Group Ltd
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 BOC Group Ltd filed Critical BOC Group Ltd
Publication of EP1130263A2 publication Critical patent/EP1130263A2/fr
Publication of EP1130263A3 publication Critical patent/EP1130263A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • F04C18/082—Details specially related to intermeshing engagement type pumps
    • F04C18/084—Toothed wheels
    • 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
    • F04C18/14—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 toothed rotary pistons
    • F04C18/16—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 toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type

Definitions

  • a vacuum pump comprises a pump body 1 which together with a top plate 2 and a bottom plate 4 defines a pumping chamber 20.
  • the top plate 2 has formed therein an inlet 3 to the pumping chamber 20 and the bottom plate 4 has formed therein an outlet 5 from the pumping chamber to atmosphere.
  • the pumping chamber 20 is in the form of a 'figure of eight', the substantially circular cross-sectional portions of which taper gradually in the direction from the inlet 3 towards the outlet 4.
  • the overall shape of the pumping chamber 20 and the rotors, 7, 8 and in particular the external thread diameter of the rotors 7, 8 are all carefully calculated to ensure close tolerances between the outer thread surfaces and the pumping chamber 20 and to ensure close tolerances also in the vicinity of the centreline of the pump where the threads of the rotors 7, 8 intermesh. All tolerances must ensure no direct contact between the rotors and between each rotor and the pump body (stator) but effecting as small a leakage path between the parts as possible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Non-Positive Displacement Air Blowers (AREA)
EP01301502A 2000-02-23 2001-02-20 Pompe à vide à engrenages helicoidaux Withdrawn EP1130263A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0004263 2000-02-23
GBGB0004263.0A GB0004263D0 (en) 2000-02-23 2000-02-23 Improvements in vacuum pumps

Publications (2)

Publication Number Publication Date
EP1130263A2 true EP1130263A2 (fr) 2001-09-05
EP1130263A3 EP1130263A3 (fr) 2002-07-24

Family

ID=9886243

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01301502A Withdrawn EP1130263A3 (fr) 2000-02-23 2001-02-20 Pompe à vide à engrenages helicoidaux

Country Status (4)

Country Link
US (1) US20010041145A1 (fr)
EP (1) EP1130263A3 (fr)
JP (1) JP2001304156A (fr)
GB (1) GB0004263D0 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7828535B2 (en) 2005-03-10 2010-11-09 Alan Notis Pressure sealed tapered screw pump/motor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB419338A (en) * 1933-01-03 1934-11-09 British Thomson Houston Co Ltd Improvements in and relating to screw pumps or compressors
DE594691C (de) * 1933-01-04 1934-03-21 Aeg Schraubenverdichter, bestehend aus rechts- und linksgaengigen, miteinander in Eingriff stehenden, durch Zahnraeder gekuppelten Schrauben
GB552562A (en) * 1941-09-01 1943-04-14 Stothert & Pitt Ltd Improvements to screw displacement pumps
DE29720541U1 (de) * 1997-11-19 1999-03-18 SIHI Industry Consult GmbH, 25524 Itzehoe Schraubenspindel-Gaspumpe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7828535B2 (en) 2005-03-10 2010-11-09 Alan Notis Pressure sealed tapered screw pump/motor

Also Published As

Publication number Publication date
GB0004263D0 (en) 2000-04-12
JP2001304156A (ja) 2001-10-31
EP1130263A3 (fr) 2002-07-24
US20010041145A1 (en) 2001-11-15

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