EP0744546A1 - Dispositif de pompage pour fluide cryogéniques - Google Patents

Dispositif de pompage pour fluide cryogéniques Download PDF

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Publication number
EP0744546A1
EP0744546A1 EP96810311A EP96810311A EP0744546A1 EP 0744546 A1 EP0744546 A1 EP 0744546A1 EP 96810311 A EP96810311 A EP 96810311A EP 96810311 A EP96810311 A EP 96810311A EP 0744546 A1 EP0744546 A1 EP 0744546A1
Authority
EP
European Patent Office
Prior art keywords
piston
pressure
compressor
pump device
pump
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.)
Granted
Application number
EP96810311A
Other languages
German (de)
English (en)
Other versions
EP0744546B1 (fr
Inventor
Jean Tornare
Philippe Drouvot
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.)
Fives Cryomec AG
Original Assignee
Cryomec AG
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 Cryomec AG filed Critical Cryomec AG
Publication of EP0744546A1 publication Critical patent/EP0744546A1/fr
Application granted granted Critical
Publication of EP0744546B1 publication Critical patent/EP0744546B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/06—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure
    • F04B15/08—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure the liquids having low boiling points

Definitions

  • the present invention relates to a pumping device for cryogenic fluids according to the preamble of patent claim 1.
  • a pump operating on the same principle is known from CH-A-663'065, but is of simpler construction and can be manufactured more cost-effectively.
  • This pumping device which is shown in FIG. 1, likewise has a high-pressure part and a pre-compressor part, which are, however, separated by a partition.
  • the pre-compressor part is accommodated in a heat-insulated fluid or intermediate container 5.
  • the high-pressure part and the pre-compressor part comprise two separate piston pumps 1, 2, which are arranged in tandem and which have a common piston rod 8 which passes through the partition wall 3 in a sliding and sealed manner (32).
  • the pre-compressor part has a cylinder 10 which is open on the suction side.
  • the pre-compression piston 11 has passage openings 17, which are closed by a valve plate 12 during the charging stroke or pre-compression, while they are open in the pressure stroke.
  • the dividing wall 3 is penetrated by suction openings 33 which connect the pre-compression chamber 16 to the high-pressure chamber 26.
  • suction openings 33 are closed by a valve plate 34 arranged in the high-pressure part and opened in the loading stroke.
  • the pump device according to the invention has essentially the same structure as the pump device known from CH-A-663'065 and works on the same principle.
  • the high-pressure and low-pressure parts are more separated from one another and are only connected to one another by suction openings or suction channels.
  • the two separate piston rods eliminate the seal in the transition from the low-pressure to the high-pressure area, so that the properties of such a seal no longer have to be taken into account when working at higher pressures. Since the piston rods are driven synchronously, the pump device can still function properly.
  • the movements of the piston rods are mechanically synchronized.
  • the piston rod of the precompressor part is arranged entirely within a fluid container, it being connected to the high-pressure piston rod by means of a connecting rod, which likewise runs in the fluid container. The connection is also completely in the low pressure range, so that the seals do not have to be so demanding.
  • the low-pressure piston rod protrudes from the fluid container and the mechanical connection takes place outside the fluid container by means of drive rods offset parallel to the piston axes.
  • the low-pressure piston rod is in turn provided with a low-pressure seal in the fluid container / environment transition. This structure has special advantages: the low pressure seal is easily accessible.
  • FIG. 1 a pumping device for cryogenic fluids according to the prior art is shown in simplified form, by means of which the working principle of the pump can be seen, which is also described in detail in CH-A-663'065.
  • FIG. 2 shows a preferred embodiment of the pump device improved according to the invention.
  • the pump device likewise comprises a pre-compressor part and a high-pressure part, the high-pressure part comprising a high-pressure piston pump 2 and the pre-compressor part a low-pressure piston pump 1, also referred to below as a pre-compressor pump.
  • the piston pumps are at least partially surrounded by a fluid container 5, which itself is in turn by means of an insulation jacket 6 is thermally insulated from the environment.
  • an insulation jacket 6 is thermally insulated from the environment.
  • a double wall surrounding the fluid container 5, in which vacuum prevails serves as the insulation jacket 6.
  • the fluid container 5 has a feed opening 50 through which the fluid enters the container.
  • a closable expansion opening 51 is provided, which leads from the container to the outside and which is used to discharge any gas bubbles that may arise.
  • the low-pressure piston pump 1 has a fixed cylinder 10 which is located entirely within the fluid container 5.
  • the cylinder 10 has essentially the shape of a tube open on the suction side, which is partially penetrated by a pre-compressor piston rod 13 and in which a pre-compressor piston 11 connected to the pre-compressor piston rod 13 is held displaceably.
  • the pre-compression piston 11 has at least one passage opening 17 which connects the fluid container 5 to the pre-compression chamber 16. This opening is closed by means of a valve plate 12 during the pre-compression or loading stroke.
  • this valve plate 12 is arranged inside the precompression chamber on the side of the piston facing away from the passage opening. In Figure 2, the valve plate 12 is shown in the open position.
  • the end of the pre-compressor piston rod 13 extends out of the fluid container 5 in a sealed manner (FIG. 14).
  • the end near the piston is located within the pre-compression chamber 16.
  • the seals 14 are located in an elongated attachment 52 on the fluid container 5 so that they are easily accessible.
  • the attachment 52 comprises an adjustable sleeve 52 ', by means of which the seals 14 can be adjusted by being pressed together to different degrees by the sleeve 52'.
  • the high-pressure piston pump 2 likewise has a cylinder 20, through which a high-pressure piston rod 23 passes and in which a high-pressure piston 24 connected to the high-pressure piston rod 23 is held displaceably.
  • the high pressure piston 21 is provided with sealing rings 21 '. These sealing rings seal the high pressure area from the remaining cylinder 20. In the area remote from the piston, a return spring 25 and an additional low-pressure seal 24 are arranged in the cylinder 20.
  • the high-pressure area of the high-pressure piston pump is located within the fluid container 5 and is therefore also surrounded by the insulation jacket 6.
  • At the end of the sealing rings 21 ′ remote from the piston there can be at least one bore 28 in the cylinder 20, which leads the fluid back into the fluid container 5 in the event of leakages.
  • a pressure line 4 leads away from the high pressure chamber 26, the outlet opening of the high pressure chamber being provided with a check valve 41.
  • the cylinder 20 of the high pressure pump 2 is closed at its piston end except for at least one suction opening 27.
  • the suction opening 27 is closed in the pressure stroke by a valve body 22 and open in the loading stroke.
  • the valve body 22 is arranged outside the cylinder and has at least one intake duct 30 and one expansion duct 31.
  • the at least one suction channel 30 connects the pre-compression chamber 16 to the high-pressure chamber 26.
  • the rising gas bubbles collect in the expansion channel 31 and are directed into the fluid container, so that liquid fluid can be conveyed almost exclusively.
  • the two piston rods 13, 23 of the pre-compressor pump 1 and the high pressure pump 2 are driven synchronously in tandem.
  • the drive can be synchronized in various ways, mechanically or electronically.
  • Mechanical synchronization means are used in these exemplary embodiments.
  • These drive rods 70 are connected to the ends remote from the piston of both the pre-compression piston rod 13 and the high-pressure piston rod 23 by means of transverse rods 71 arranged at least approximately at right angles thereto.
  • These mechanical synchronization means can also be mounted on existing pumping devices and are easily adjustable.
  • the crossbars can also form a different angle with the drive rods.
  • FIG. 3 shows a second preferred exemplary embodiment of the pump device according to the invention, of essentially the same structure as that in FIG. 2.
  • the pre-compression piston rod 13 is here axially offset from the high-pressure piston rod 23. It is located completely within the fluid container 5 and does not protrude this out.
  • the pre-compression piston rod 13 is in turn sealed against the fluid container (14 ').
  • the piston rod 13 now passes through the low pressure cylinder 10 on two sides.
  • the valve plate 12 is on the other side of the piston 11 than in the example in FIG. 2 and is fixedly connected to the piston rod, but the piston 11 is movable.
  • the solutions for the pre-compressor pump shown in FIGS. 1 and 2 are interchangeable.
  • the end of the pre-compression piston rod 13 remote from the piston is in turn connected to the high-pressure piston rod 23 by means of mechanical synchronization means, which, however, run entirely within the fluid container.
  • These means here comprise a connecting rod 72 which runs at least approximately in the vertical plane to the piston axes, is connected on the one hand to the pre-compression piston rod 13 and on the other hand penetrates the high-pressure piston rod 23 in the area behind the sealing rings 21 ', that is to say in the low-pressure area.
  • the cylinder 20 of the high-pressure piston pump 2 has a recess 29 along its axis, which enables the connecting rod 72 to run with the piston rods 13, 23. It is possible to connect several pre-compressor pumps to the same high pressure pump.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Compressor (AREA)
EP19960810311 1995-05-26 1996-05-15 Dispositif de pompage pour fluide cryogéniques Expired - Lifetime EP0744546B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1564/95 1995-05-26
CH156495 1995-05-26

Publications (2)

Publication Number Publication Date
EP0744546A1 true EP0744546A1 (fr) 1996-11-27
EP0744546B1 EP0744546B1 (fr) 1998-12-23

Family

ID=4213380

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960810311 Expired - Lifetime EP0744546B1 (fr) 1995-05-26 1996-05-15 Dispositif de pompage pour fluide cryogéniques

Country Status (2)

Country Link
EP (1) EP0744546B1 (fr)
DE (1) DE59601034D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004007958A1 (fr) * 2002-07-12 2004-01-22 Cryomec Ag Pompe haute pression pour substances liquides cryogeniques
EP2461033A1 (fr) * 2010-12-01 2012-06-06 Linde Aktiengesellschaft Compresseur à piston à plusieurs niveaux de compression

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE742150C (de) * 1941-12-04 1943-11-23 Draegerwerk Heinr U Bernh Drae Kompressor oder Umfuellpumpe fuer Sauerstoff
US2630757A (en) * 1948-03-26 1953-03-10 Independent Engineering Compan Combined type series pump for flashable liquids
EP0087131A1 (fr) * 1982-02-22 1983-08-31 Air Products And Chemicals, Inc. Pompe à hélium à haute pression pour gaz liquide ou supercritique
CH663065A5 (de) * 1984-07-20 1987-11-13 Cryomec Ag Pumpvorrichtung fuer cryogene fluide.
DE4142053C1 (fr) * 1991-12-19 1993-06-17 Linde Ag, 6200 Wiesbaden, De

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE742150C (de) * 1941-12-04 1943-11-23 Draegerwerk Heinr U Bernh Drae Kompressor oder Umfuellpumpe fuer Sauerstoff
US2630757A (en) * 1948-03-26 1953-03-10 Independent Engineering Compan Combined type series pump for flashable liquids
EP0087131A1 (fr) * 1982-02-22 1983-08-31 Air Products And Chemicals, Inc. Pompe à hélium à haute pression pour gaz liquide ou supercritique
CH663065A5 (de) * 1984-07-20 1987-11-13 Cryomec Ag Pumpvorrichtung fuer cryogene fluide.
DE4142053C1 (fr) * 1991-12-19 1993-06-17 Linde Ag, 6200 Wiesbaden, De

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004007958A1 (fr) * 2002-07-12 2004-01-22 Cryomec Ag Pompe haute pression pour substances liquides cryogeniques
EP2461033A1 (fr) * 2010-12-01 2012-06-06 Linde Aktiengesellschaft Compresseur à piston à plusieurs niveaux de compression

Also Published As

Publication number Publication date
DE59601034D1 (de) 1999-02-04
EP0744546B1 (fr) 1998-12-23

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