EP1375921A1 - Pompe à haute pression à faible volume - Google Patents

Pompe à haute pression à faible volume Download PDF

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Publication number
EP1375921A1
EP1375921A1 EP02405509A EP02405509A EP1375921A1 EP 1375921 A1 EP1375921 A1 EP 1375921A1 EP 02405509 A EP02405509 A EP 02405509A EP 02405509 A EP02405509 A EP 02405509A EP 1375921 A1 EP1375921 A1 EP 1375921A1
Authority
EP
European Patent Office
Prior art keywords
piston
pump
sealing
displacement chamber
sealing surfaces
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Withdrawn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
EP02405509A
Other languages
German (de)
English (en)
Inventor
Fritz Gyger
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP02405509A priority Critical patent/EP1375921A1/fr
Priority to EA200401530A priority patent/EA009029B1/ru
Priority to AU2003233907A priority patent/AU2003233907A1/en
Priority to CNB03814123XA priority patent/CN100406734C/zh
Priority to CA2485552A priority patent/CA2485552C/fr
Priority to AT03727124T priority patent/ATE536477T1/de
Priority to PCT/CH2003/000394 priority patent/WO2004001228A2/fr
Priority to DE60326841T priority patent/DE60326841D1/de
Priority to EP03727124A priority patent/EP1514027B1/fr
Publication of EP1375921A1 publication Critical patent/EP1375921A1/fr
Priority to US12/562,020 priority patent/US20100008803A1/en
Withdrawn legal-status Critical Current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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/005—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons
    • F04B11/0075—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons connected in series
    • 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
    • F04B53/144—Adaptation of piston-rods
    • F04B53/147—Mounting or detaching of piston rod
    • 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
    • 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
    • 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
    • F04B53/164—Stoffing boxes
    • 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
    • F04B2201/00—Pump parameters
    • F04B2201/02—Piston parameters
    • F04B2201/0201—Position of the piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2203/00—Non-metallic inorganic materials
    • F05C2203/08—Ceramics; Oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/04—PTFE [PolyTetraFluorEthylene]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/12—Polyetheretherketones, e.g. PEEK

Definitions

  • the present invention relates to pumps according to Preamble of claim 1. Furthermore, the Invention on adjustment methods and uses of such Pump.
  • a common design has two positive displacement pump units which are arranged in series.
  • the first unit is that Feed pump, the liquid under low pressure, e.g. B. Ambient pressure, sucked in and under operating pressure to the second Unit, the storage pump, promotes.
  • the storage pump works essentially in opposition to the first unit. It ensures a fluid flow during the first Unit sucks, and absorbs the excess when the first unit the working medium under operating pressure ejects. This allows a steady flow with less Pulsation can be achieved.
  • the pistons are made of hard material, in particular ceramic, which in stone bearings, i.e. bearings made of ruby, sapphire, synthetic Corundum or ceramic.
  • the sealing takes place via piston seals that are open to the working volume. There so that the pressurized working medium has access to Has the outside of the sealing lip, it with the Working pressure pressed against the piston surface and ensures thus even for the sealing effect corresponding to the pressure.
  • the parts that come into contact with the working medium are Made of high quality material, metal and Precious stones, executed to the required pressure resistance and to ensure chemical inertness. Common is z. B. the use of titanium.
  • the pistons are driven via camshafts on the rear end of the pistons act in conjunction with resilient return elements.
  • the pumps are also subject to aging, which is their maintenance makes necessary. Because of the high demands, especially when Assembly is usually required to do this by a specialist.
  • Suitable pumps are e.g. B. known from DE-A-43 08 467.
  • the pumps are characterized by the fact that they stand out disc-shaped function blocks is built up in a Clamping device can be clamped together. Because the transitions running from block to block, external ones are omitted Connection lines between the units.
  • Another task is to understand the influence of the Check and / or reduce dead volume.
  • a main aspect of the invention is therefore that Make dead volume adjustable and otherwise generally too reduce.
  • One measure for this is a construction of the Displacement chamber and / or the piston, the adjustment on minimum dead volume allowed or to a dead volume that optimal behavior of the pump at the desired operating pressure results.
  • the total length is suggested of the piston adjustable in that it in the actual piston and a piston rod is divided.
  • the connection between the piston and piston rod is in the length is variable so that an adjustment at a minimal distance from the piston to the displacement chamber floor is possible.
  • the distance can even be adjusted to zero when to avoid damage to the chamber floor is made by an insert that is under Operating pressure is sufficiently incompressible, but at Stop of the piston yields so far that no damage occurs.
  • Another approach is one To provide an opposing piston, the front end of which is essentially represents the chamber floor. So that the chamber floor can be moved.
  • the classic piston seal has a spiral spring that lies in the piston seal and runs around the sealing lip. Especially the interior the spiral spring results in a large dead volume.
  • a side open Spring element specified. Through the opening a Packing elements are inserted into the spring element, so that the Most of the cavity within the spring element is filled out.
  • the flat shape of the spring element allows the inner wall of the displacement chamber in the Area of the seal with a small cross section perform and thus keep the dead volume small.
  • Dead volume By reducing or adjusting the Dead volume is also the effect of manufacturing tolerances counteracted.
  • a cartridge can be in the essentially be a line piece (connecting sleeve) or z.
  • B. contain a check valve ("valve cartridge").
  • the area pairs involved as one Combination of crowning (convex, spherical surface) and hollow cone surface. With an offset of Medium inlet and connecting part are easy tilted seat of the connecting cartridge.
  • the parties Area pairs can not only be between the named Parts, but also between the part and a sealing body (a capsule).
  • a capsule Preferably located the cambered surface on the capsule.
  • Figg. 1 and 2 show a sectional view of a Head 1 of an HPLC pump designed according to the invention.
  • the Parts not shown are designed according to the state of the art.
  • the Piston arrangements for feed pump device 3 (feed pump) and storage pump device 4 (storage pump) which the Replace known one-piece pistons, each consist of a piston 7, 8 and a piston rod 11, 12.
  • Die Piston rods are in high quality linear guides in the Drive housing guided, especially in linear ball bearings (not shown). Such camps are in themselves Known specialist.
  • a sleeve 15, 16 on a hard material rod 19, 20 e.g. made of ceramic
  • the sleeves 15, 16 are at the rear end closed.
  • a steel ball 25 is first to be defined precisely (z. B. hardened steel) in the holes 26 and then the respective hard material rod 19, 20 in the collar pressed.
  • the balls 25 result in a defined one Support on the one hand in the center of the hard material rods and on the other other ring-shaped on the through the usual drill tips conical bottom of the holes 26.
  • the sleeves 15, 16 are seated in receiving bores 28 in the Ends of the piston rods 11, 12.
  • a Receiving hole 30 in the bottom of the receiving holes 28 is in the In the case of the piston 8 of the storage pump 4, a spring 32 used, the free end at the bottom 22, 23 of the sleeves 15, 16 is present.
  • Outside is around the piston rods 11, 12 one collar 36 each.
  • In each collar 36 is located in a thread 39 an adjusting screw 38, the end of a bore 40 in the piston rod 11, 12 on the sleeve 15, 16 is attachable.
  • the pistons 7, 8 can be locked in the respective piston rod.
  • Die Chamber 47 consists of high strength and chemically inert Material, e.g. B. Titan.
  • Outlet 112 of the feed pump 3 is a conventional one flexible pipe 114 with a small internal volume with the Inlet 115 of the storage pump 4 connected.
  • line 114 is close to the screw connections known per se Connections attached.
  • a first embodiment 48 is one on the delivery piston Piston seal according to the invention shown in Fig. 3rd is shown enlarged. It essentially consists of a sealing body 50 of substantially L-shaped Cross section, wherein one leg 52 is a sleeve-shaped Forms sealing lip through which the hard material rod 19, 20th a piston 7, 8 can be inserted. Around the sealing lip a spring 54 runs around such that the Wind spiral turns even around the sealing lip. As in Fig. 1, the inner wall 56 can thus be around the seal 48 are relatively narrow compared to the Training around the conventional piston seal 44, whereby the dead volume is significantly reduced.
  • the displacement chamber 47 of the feed pump 3 is open at the bottom executed and closed with a counter-piston 58, the front end the (movable) floor of the displacement chamber forms.
  • the counter-piston 58 is also made of titanium.
  • the Counter-piston passes through a sealing sleeve 60, which by a Clamping sleeve 62 in an extension 64 of Displacement chamber bore 57 is held.
  • a screw connection of both the sleeve 62 in the Extension 64 and also the counter-piston 58 in the sleeve 62 to be provided by turning the counter piston Shift and thus a change in the volume of the To be able to effect displacement chamber.
  • Fig. 11 shows a known seal 64, which instead of Sealing sleeve 60 can be used and a small dead volume having. Because the counter piston 58 does not operate and is only rarely moved, these are Seal made significantly lower requirements.
  • the Seal 64 has a sealing body 65 with a Sealing lip 66 on the counter piston 58 (not shown) is pressed.
  • the proof is first of all embedded O-ring 67 applied and during operation of Internal pressure of the pump on the O-ring 67 and on the Sealing lip acts, reinforced.
  • As material for the Sealing bodies come pressure-resistant and under the Operating conditions using chemically inert materials, such as PTFE in particular.
  • FIG. 70 Another embodiment is 70 in the storage pump a piston seal according to the invention.
  • a Figure shows an enlargement of the piston seal 70 used 4 and the special spring element Fig. 5.
  • the sealing element 72nd the piston seal has a C-shaped cross section like also the spring element 74.
  • At the end of the inner Sealing lip 73 is a thickening or crowning 75 educated.
  • the spring element 74 is on the inner surface 76 and on the bend 77 several times through slots 79 separated. Depending on the desired stiffness, divide the Slits also the outer surface 81, the rigidity with the width of the remaining webs 82 decreases.
  • the curvature 77 describes an angle that is slightly less than 180 °, so that the inner surface slopes slightly inwards. This means that when the spring element 74 is inserted into the sealing element 72 is inserted, a bias of the sealing lip 73 is achieved.
  • the spring element 74 is in the sealing element 72 arranged with parallel cross sections and in an annular filler 83 inserted.
  • the packing consists of a material that chemically inert to the working medium and below that Working pressure is essentially incompressible.
  • the Packing is dimensioned so that the interior of the Filled largely spring element, d. H. at least that Half, preferably at least 90% and more preferred at least 99%. Basically, it becomes as voluminous as possible chosen without, however, the spring action of To affect the spring element below the required size.
  • the seal By filling the empty volume, the seal becomes generated dead volume significantly reduced and at the same time an installation dimension as for a conventional piston seal maintained.
  • the storage pump also has a precaution Adjustment of the dead volume on the adjustment device between piston 8 and piston rod 16 and an insert 87 in the displacement chamber 89.
  • the material of the Insert 87 is chosen so that contact between the Hard material rod 20 and the insert 87 is possible without that damage occurs.
  • a material chosen that inert to the working medium and under Operating pressure is practically incompressible, but from Hard material is still slightly deformable. It is also to take into account that the size of the front ends of the Hard material rods 19, 20 are rounded to them without damaging the seals and the guides in the To be able to introduce displacement chambers.
  • the material of the Insert 87 can do something about this rounding nestle, which further reduces the dead volume becomes.
  • the displacement chambers 47, 89 are in bores in one Pump block 91 inserted.
  • For the correct alignment with the laterally arranged access holes 92 have the Displacement chambers 47, 89 a groove 93 into which a pin 94 engages.
  • An extension ring follows the displacement chambers 47, 89 95, which in the block extension 96 by a threaded ring 97 is fixed.
  • Block extension 96 is at block 91 screwed.
  • All parts exposed to the working medium consist of a material that is inert to the working medium. As far as they are also exposed to the operating pressure the pressure even without noticeable compression or deformation withstand.
  • housing parts such as displacement chambers, Cartridges, connections, but also for metallic ones Sealing membranes, titanium has become a metal in particular proven.
  • the hard material for the pistons is regarding Pressure resistance is usually not a problem. At most attention should be paid to the chemical inertness, but this in the Rule is also readily given.
  • Elastomer preferably the plastic PTFE (Polytetrafluoroethylene), usable, especially one with Graphite fiber reinforced PTFE, which is an increased Wear resistance, pressure and temperature resistance having.
  • PEEK is also particularly useful for seals (Polyether ether ketone) can be used.
  • feed pump and Storage pump can also be run identically.
  • both can be the same Piston seals according to the invention of one or the other Be equipped.
  • the feed pump can be in a further preferred embodiment instead of a counter-piston, a closed displacement chamber have with an insert 87, so as that described Storage pump to be formed, and vice versa Storage pump like the feed pump described. So that can the dead volume of the feed pump to almost zero be set what is under practically all Operating conditions is optimal. By moving the Counter piston in the storage pump, it is then possible to To minimize pulsation, i.e. the pump to the working pressure and the compressibility properties of the working medium adjust.
  • the storage pump works under constant pressure and therefore has to meet lower requirements lower requirements for her also on measures in the Displacement chamber for reducing or adjusting the Dead volume can be dispensed with.
  • the Quality particularly low demands are made,
  • the dead volume can then be determined by pulling the counter-piston back on desired size can be increased.
  • Fig. 12 and 13 is another preferred one Embodiment of connections for connecting a Capillary line shown without additional function.
  • Line 114 consists of titanium and is welded to an end piece 130.
  • the connector 100 is a screw sleeve trained, which is displaceable on the capillary.
  • the implementation for line 114 through the Connector 100 is flared at inner end 132 to offer 134 space for the weld seam.
  • the sealing surface 136 of end piece 130 is configured as described above To enable a perfect seal even when offset.
  • the execution with sealing capsule or Version with a sealing membrane see above.
  • To the Attaching the cable is like the screw sleeve itself known screwed into the pump housing.
  • connection 100 consists of PEEK or Steel.
  • FIG. 13 shows a connecting line 114 at its ends the above connection arrangements are attached.
  • the welding of the second of the end pieces 130 must two screw collars 100 on line 114 be postponed. Bending line 114 into the necessary form, e.g. B. U-shaped, can be done afterwards.
  • Each of the measures leads to an increase in quality the pump, but can also be used for maintenance to simplify, d. H. especially the skills of the To make maintenance personnel less demanding. In particular, it is possible that the maintenance on site can be carried out by the user without loss of quality to accept.
  • connections can also be flanged instead of screwed or otherwise attached to the pump body. Prefers however, they are removable for maintenance and repair work not to complicate.
EP02405509A 2002-06-19 2002-06-19 Pompe à haute pression à faible volume Withdrawn EP1375921A1 (fr)

Priority Applications (10)

Application Number Priority Date Filing Date Title
EP02405509A EP1375921A1 (fr) 2002-06-19 2002-06-19 Pompe à haute pression à faible volume
AT03727124T ATE536477T1 (de) 2002-06-19 2003-06-18 Hochdruck-kleinvolumen-verdrängerpumpe
AU2003233907A AU2003233907A1 (en) 2002-06-19 2003-06-18 High-pressure small volume pump
CNB03814123XA CN100406734C (zh) 2002-06-19 2003-06-18 泵
CA2485552A CA2485552C (fr) 2002-06-19 2003-06-18 Pompe haute pression a faible volume
EA200401530A EA009029B1 (ru) 2002-06-19 2003-06-18 Насос высокого давления небольшого объема
PCT/CH2003/000394 WO2004001228A2 (fr) 2002-06-19 2003-06-18 Pompe haute pression a faible volume
DE60326841T DE60326841D1 (de) 2002-06-19 2003-06-18 Hochdruck-kleinvolumen-verdrängerpumpe
EP03727124A EP1514027B1 (fr) 2002-06-19 2003-06-18 Pompe haute pression a faible volume
US12/562,020 US20100008803A1 (en) 2002-06-19 2009-09-17 High-pressure small volume pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02405509A EP1375921A1 (fr) 2002-06-19 2002-06-19 Pompe à haute pression à faible volume

Publications (1)

Publication Number Publication Date
EP1375921A1 true EP1375921A1 (fr) 2004-01-02

Family

ID=29716992

Family Applications (2)

Application Number Title Priority Date Filing Date
EP02405509A Withdrawn EP1375921A1 (fr) 2002-06-19 2002-06-19 Pompe à haute pression à faible volume
EP03727124A Expired - Lifetime EP1514027B1 (fr) 2002-06-19 2003-06-18 Pompe haute pression a faible volume

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP03727124A Expired - Lifetime EP1514027B1 (fr) 2002-06-19 2003-06-18 Pompe haute pression a faible volume

Country Status (8)

Country Link
EP (2) EP1375921A1 (fr)
CN (1) CN100406734C (fr)
AT (1) ATE536477T1 (fr)
AU (1) AU2003233907A1 (fr)
CA (1) CA2485552C (fr)
DE (1) DE60326841D1 (fr)
EA (1) EA009029B1 (fr)
WO (1) WO2004001228A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011056094B4 (de) 2011-12-06 2014-05-28 Dionex Softron Gmbh Schaltventil, insbesondere für das Schalten eines unter hohem Druck stehenden Fluids

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2346964A (en) * 1940-08-26 1944-04-18 Omega Machine Company Positive displacement pump
US2733664A (en) * 1956-02-07 saalfrank
US2841092A (en) * 1955-08-09 1958-07-01 Milton Roy Co High-pressure pump
US3981620A (en) * 1972-03-06 1976-09-21 Waters Associates, Inc. Pumping apparatus
US4045343A (en) * 1975-11-10 1977-08-30 Varian Associates, Inc. High pressure liquid chromatography system
US4592558A (en) * 1984-10-17 1986-06-03 Hydril Company Spring ring and hat ring seal
US4706970A (en) * 1984-11-14 1987-11-17 Polydyne Industries, Inc. Flexible ring seal with insert in circumferentially extending channel
DE4308467A1 (de) 1992-10-28 1994-05-05 Herbert Dr Funke Hochdruckpumpe zur Flüssigkeits-Feindosierung
EP0677659A2 (fr) * 1994-04-13 1995-10-18 Cryomec AG Dispositif d'entraînement d'une pompe à piston pour des fluides à très basse température
US5799953A (en) * 1995-05-25 1998-09-01 American Variseal Capped spring-energized seal
EP0898077A1 (fr) * 1997-08-20 1999-02-24 Hydrair Limited Pompe pour fluides sensibles au cisaillement

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2733664A (en) * 1956-02-07 saalfrank
US2346964A (en) * 1940-08-26 1944-04-18 Omega Machine Company Positive displacement pump
US2841092A (en) * 1955-08-09 1958-07-01 Milton Roy Co High-pressure pump
US3981620A (en) * 1972-03-06 1976-09-21 Waters Associates, Inc. Pumping apparatus
US4045343A (en) * 1975-11-10 1977-08-30 Varian Associates, Inc. High pressure liquid chromatography system
US4592558A (en) * 1984-10-17 1986-06-03 Hydril Company Spring ring and hat ring seal
US4706970A (en) * 1984-11-14 1987-11-17 Polydyne Industries, Inc. Flexible ring seal with insert in circumferentially extending channel
DE4308467A1 (de) 1992-10-28 1994-05-05 Herbert Dr Funke Hochdruckpumpe zur Flüssigkeits-Feindosierung
EP0677659A2 (fr) * 1994-04-13 1995-10-18 Cryomec AG Dispositif d'entraînement d'une pompe à piston pour des fluides à très basse température
US5799953A (en) * 1995-05-25 1998-09-01 American Variseal Capped spring-energized seal
EP0898077A1 (fr) * 1997-08-20 1999-02-24 Hydrair Limited Pompe pour fluides sensibles au cisaillement

Also Published As

Publication number Publication date
AU2003233907A8 (en) 2004-01-06
EA009029B1 (ru) 2007-10-26
WO2004001228A3 (fr) 2004-03-04
AU2003233907A1 (en) 2004-01-06
DE60326841D1 (de) 2009-05-07
WO2004001228A2 (fr) 2003-12-31
CA2485552A1 (fr) 2003-12-31
EP1514027A2 (fr) 2005-03-16
EP1514027B1 (fr) 2011-12-07
EA200401530A1 (ru) 2006-10-27
CN1662745A (zh) 2005-08-31
ATE536477T1 (de) 2011-12-15
CA2485552C (fr) 2011-08-23
CN100406734C (zh) 2008-07-30

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