EP0698737A1 - Verfahren zum Pumpen von Helium bei niedriger Temperatur mit einer Spiralpumpe - Google Patents

Verfahren zum Pumpen von Helium bei niedriger Temperatur mit einer Spiralpumpe Download PDF

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Publication number
EP0698737A1
EP0698737A1 EP95401918A EP95401918A EP0698737A1 EP 0698737 A1 EP0698737 A1 EP 0698737A1 EP 95401918 A EP95401918 A EP 95401918A EP 95401918 A EP95401918 A EP 95401918A EP 0698737 A1 EP0698737 A1 EP 0698737A1
Authority
EP
European Patent Office
Prior art keywords
pump
pumping
fixed part
spiral
helium gas
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.)
Ceased
Application number
EP95401918A
Other languages
English (en)
French (fr)
Inventor
Gérard Claudet
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
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 Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP0698737A1 publication Critical patent/EP0698737A1/de
Ceased 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/04—Heating; Cooling; Heat insulation
    • 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
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
    • F04C18/0223—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving with symmetrical double wraps
    • 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
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids

Definitions

  • the present invention is defined by the application of a positive displacement pump for pumping helium gas at cryogenic temperatures.
  • positive displacement pump is meant a pump mainly constituted by a fixed part and a mobile part which together delimit a delivery volume in which the fluid is attracted and compressed by a reduction in this volume before leaving the pump. It is therefore an almost static compression, unlike that of turbomachines where the pressure comes from a transformation of kinetic energy, communicated to the gas by blades, into pressure energy.
  • Helium is widely used in cryogenics because of its extremely low boiling point, since there is still superfluid helium at 1.8 K. This result is however obtained only at low pressure, l '' order of 15 millibars.
  • the evaporated helium must be removed from the installation and renewed, at a rate which can reach several tens of grams per second. The choice of a satisfactory pumping process is problematic under these conditions.
  • the gas is pumped at low temperature by a positive displacement pump, the essential property of which is to provide a sufficient pumping flow whatever the flow of incident gas.
  • the positive displacement pumps envisaged have the characteristic of being suitable for low temperature service.
  • the mobile parts responsible for the gas delivery are therefore constructed with play with the fixed parts of the pump, and we choose designs where the mobile parts are spirals, to the detriment of piston pumps for example, where high friction is inevitable. .
  • Other arrangements of positive displacement pumps made necessary by the application will be explained below.
  • the pump comprises a single housing 24, divided into a pumping chamber 25 (cold) and a control chamber 26 (hot) connected together by two tubular junctions 27 and 28 of the housing 24 which provide passage to two control shafts 29 and 30.
  • the tubular junctions 27 and 28 and the control shafts 29 and 30 are thermally insulating so as not to tolerate any appreciable passage of heat by conduction between the chambers 25 and 26.
  • An orifice gas inlet 31 opens into the pumping chamber 25 from the periphery of the latter, and two outlet orifices 32 and 33, which it is possible to then connect by pipes, terminate in the axis of the pumping chamber 25.
  • the control shafts 29 and 30 carry a plate 34 on both sides from which spirals 35 and 36 rise. These spirals 35 and 36 are movable in fixed spirals 37 and 38 connected to fixed plates 39 and 40 that the orifices of outlet 32 and 33 pass through the center and which are cooled by coils 41 and 42 if isothermal compression is desired.
  • the spirals 35 to 38 are all similar to each other but the movable spirals 35 and 36 are offset from the fixed spirals 37 and 38 and complete a circular trajectory therein. It follows from this behavior that the fixed and mobile spirals delimit delivery volumes 43 in half-moons (FIG. 2a) which are compressed and moved towards the center. The gas engulfed by the inlet orifice 31 ends up slipping into the delivery volumes 43 passing between the movable plate 34 and the edges of the fixed spirals 37 and 38 and thus progresses between the spirals and the plates to the orifices outlet 32 and 33. A clearance remains purposely between the fixed spirals 37 and 38 and mobile 35 and 36, so that no lubricant is necessary.
  • the members located in the control chamber 26 may be elements designed to operate at normal temperature. Found, associated with each of the control shafts 29 and 30, a motor 44, ball bearings 45 and 46 to support the output shaft 47 of the motor 44, and an eccentric 48 at one end of the output shaft 47, which carries a last ball bearing 49 in which the end of the control shaft 29 or 30 is engaged.
  • the two motors 44 are synchronized by a servo not shown and whose construction is obvious to the specialist.
  • An external enclosure 50 surrounds the housing 24 (except at the location of the control chamber 26, which protrudes therefrom) to delimit a vacuum cavity 51 which surrounds the pumping chamber 25 and thus guarantees good insulation of the machine.
  • the coils 42 and 44 welded to the spirals could be replaced by conduits dug within the grooves, with the same effect.
  • the term “spiral” is used to mean any shape in particular wound on itself and capable of forming, with another, more or less closed volumes which move from one end to another of one of these spirals, fixed, when the other of these spirals travels in a periodic and in particular circular movement.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
EP95401918A 1994-08-23 1995-08-21 Verfahren zum Pumpen von Helium bei niedriger Temperatur mit einer Spiralpumpe Ceased EP0698737A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9410217A FR2723986B1 (fr) 1994-08-23 1994-08-23 Application d'une pompe volumetrique au pompage de l'helium gazeux a des temperatures cryogeniques
FR9410217 1994-08-23

Publications (1)

Publication Number Publication Date
EP0698737A1 true EP0698737A1 (de) 1996-02-28

Family

ID=9466443

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95401918A Ceased EP0698737A1 (de) 1994-08-23 1995-08-21 Verfahren zum Pumpen von Helium bei niedriger Temperatur mit einer Spiralpumpe

Country Status (4)

Country Link
US (1) US5628194A (de)
EP (1) EP0698737A1 (de)
JP (1) JPH0874772A (de)
FR (1) FR2723986B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4999157B2 (ja) * 2006-12-28 2012-08-15 アネスト岩田株式会社 磁気カップリングを介して駆動源に結合した流体機械

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4328684A (en) * 1978-04-10 1982-05-11 Hughes Aircraft Company Screw compressor-expander cryogenic system with magnetic coupling
WO1986001262A1 (en) * 1984-08-16 1986-02-27 Sundstrand Corporation Unloading of scroll compressors
EP0174092A1 (de) * 1984-07-31 1986-03-12 Sanden Corporation Flüssigkeitsverdichter des Exzenterspiraltyps
US4693736A (en) * 1986-09-12 1987-09-15 Helix Technology Corporation Oil cooled hermetic compressor used for helium service
US4831828A (en) * 1987-05-27 1989-05-23 Helix Technology Corporation Cryogenic refrigerator having a convection system to cool a hermetic compressor
US5242285A (en) * 1989-12-12 1993-09-07 Acd, Inc. Cryogenic vane pump

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4082484A (en) * 1977-01-24 1978-04-04 Arthur D. Little, Inc. Scroll-type apparatus with fixed throw crank drive mechanism
US4490099A (en) * 1980-10-03 1984-12-25 Sanden Corporation Scroll type fluid displacement apparatus with thickened center wrap portions
US4382754A (en) * 1980-11-20 1983-05-10 Ingersoll-Rand Company Scroll-type, positive fluid displacement apparatus with diverse clearances between scroll elements
FR2564955B1 (fr) * 1984-05-28 1987-03-20 Inst Francais Du Petrole Procede de production de chaleur et/ou de froid au moyen d'une machine a compression fonctionnant avec un fluide mixte de travail
JPS6171608A (ja) * 1984-09-17 1986-04-12 Toshiba Corp 超電導装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4328684A (en) * 1978-04-10 1982-05-11 Hughes Aircraft Company Screw compressor-expander cryogenic system with magnetic coupling
EP0174092A1 (de) * 1984-07-31 1986-03-12 Sanden Corporation Flüssigkeitsverdichter des Exzenterspiraltyps
WO1986001262A1 (en) * 1984-08-16 1986-02-27 Sundstrand Corporation Unloading of scroll compressors
US4693736A (en) * 1986-09-12 1987-09-15 Helix Technology Corporation Oil cooled hermetic compressor used for helium service
US4831828A (en) * 1987-05-27 1989-05-23 Helix Technology Corporation Cryogenic refrigerator having a convection system to cool a hermetic compressor
US5242285A (en) * 1989-12-12 1993-09-07 Acd, Inc. Cryogenic vane pump

Also Published As

Publication number Publication date
FR2723986A1 (fr) 1996-03-01
JPH0874772A (ja) 1996-03-19
FR2723986B1 (fr) 1996-09-20
US5628194A (en) 1997-05-13

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