[go: up one dir, main page]

WO2012122977A1 - Unité cylindre-piston pour pompe à piston, en particulier pour la chromatographie liquide à haute performance - Google Patents

Unité cylindre-piston pour pompe à piston, en particulier pour la chromatographie liquide à haute performance Download PDF

Info

Publication number
WO2012122977A1
WO2012122977A1 PCT/DE2012/100060 DE2012100060W WO2012122977A1 WO 2012122977 A1 WO2012122977 A1 WO 2012122977A1 DE 2012100060 W DE2012100060 W DE 2012100060W WO 2012122977 A1 WO2012122977 A1 WO 2012122977A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
cylinder
sensor
cylinder unit
unit
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
PCT/DE2012/100060
Other languages
German (de)
English (en)
Inventor
Michael HÄCKEL
Richard Schloderer
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.)
Dionex Softron GmbH
Original Assignee
Dionex Softron GmbH
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 Dionex Softron GmbH filed Critical Dionex Softron GmbH
Publication of WO2012122977A1 publication Critical patent/WO2012122977A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/03—Pressure in the compression chamber

Definitions

  • Piston-cylinder unit for a piston pump in particular
  • the invention relates to a piston-cylinder unit for a piston pump, in particular for high performance liquid chromatography (HPLC) with the features of the preamble of claim 1. Furthermore, the invention relates to a multi-piston pump with at least one such piston-cylinder unit according to claim 8.
  • HPLC high performance liquid chromatography
  • double-piston pumps are used in HPLC, wherein the piston-cylinder units can be connected in series or in parallel with regard to the flow path of the liquid medium to be delivered.
  • the piston-cylinder units can be connected in series or in parallel with regard to the flow path of the liquid medium to be delivered.
  • the first piston-cylinder unit is connected with its inlet to the low pressure side of the medium to be pumped.
  • a check valve is usually provided, which is opened or closed under pressure control.
  • this check valve is opened as a result of the lower cylinder pressure in the cylinder volume, so that the medium to be conveyed is sucked.
  • the medium is compressed in the cylinder volume, whereby initially the check valve at the inlet is closed by the higher pressure in the cylinder volume.
  • the medium is initially compressed by the further forward movement of the piston until the pressure in the cylinder volume of this first piston-cylinder unit has reached the working pressure of the pump.
  • a further check valve provided at the outlet of the first piston-cylinder unit, which is closed during the intake phase and the first phase of the compression phase, is opened, so that the fuel to be pumped liquid medium is conveyed from the outlet of the first piston-cylinder unit to the input of the second piston-cylinder unit connected in series therewith.
  • the movements of the two piston-cylinder units are synchronized so that upon reaching the working pressure in the compression phase of the first piston-cylinder unit, the delivery phase of the second piston-cylinder unit is just before its end.
  • the flow at the outlet of the second piston-cylinder unit which also represents the output of the double piston pump, is determined both by the delivery movement of the piston of the first piston-cylinder unit generated by the delivery movement of the piston of the second piston-cylinder unit and would be greater than the constant flow, which is generated by a corresponding control of the piston of the second piston-cylinder unit during that phase, while the flow at the output of the double piston pump is generated exclusively by the second piston-cylinder unit.
  • the drives or the coupled drive for the two piston-cylinder units are controlled so that the (forward) movement of the two pistons is slowed down so that even during this transition phase constant flow rate is given at the output of the double piston pump.
  • the control of the relevant drives or the relevant common drive can be such that at the output of the double piston pump (or multi-piston pump) results in a constant as possible predetermined flow.
  • the individual drives or the common drive for the piston-cylinder unit being in turn driven in dependence on the sensor signal or signals, that results in a constant flow rate at the output of the double piston pump, especially during the transition phases.
  • a parallel connection of more than two piston-cylinder units for realizing a multi-piston pump is possible, wherein the piston movements of the individual pumps each have a corresponding phase shift.
  • a double-piston pump with two piston-cylinder units connected in series, in which the pressure of the medium in the volume of the first piston-cylinder unit is detected by means of a first pressure sensor and the pressure at the outlet of the second piston-cylinder unit by means of a second pressure sensor is described for example in US Pat. No. 7,850,844 B2.
  • the signals of the pressure sensors are used by a control unit to estimate in the manner described above the time of completion of the compression phase in the first piston-cylinder unit.
  • conventional pressure sensors are used with the disadvantages described above.
  • US 2010/0143155 A1 describes a double-piston pump with two serially coupled piston-cylinder units, in which a direct measurement of the pressure at the outlet of the first piston-cylinder unit is dispensed with. Instead, this publication proposes to make an indirect pressure measurement by employing a force or torque sensor which senses values of mechanical forces and / or torques applied to or transmitted from the structure of the piston-cylinder unit or the respective drive means become.
  • US 2010/0143155 A1 proposes to detect those mechanical forces or torques exerted on an element of the drive for the piston of the relevant piston-cylinder unit. To detect these mechanical quantities, it is proposed to use sensors which have strain gauges, piezo elements, acoustic resonators or optical measuring devices.
  • the invention is therefore based on this prior art, the object to provide a piston-cylinder unit for a piston pump, in particular for the high performance liquid chromatography, which has a sensor device which is simple and inexpensive to produce and which generates a signal which corresponds as closely as possible to the pressure in the volume of the piston-cylinder unit. Furthermore, the invention has for its object to provide a piston pump with at least one such piston-cylinder unit.
  • the invention solves this problem with the features of claims 1 and 8, respectively.
  • the invention is based on the recognition that, compared to the aforementioned prior art, an improvement in the accuracy in the correlation between the detected physical quantity and the pressure actually prevailing in the cylinder volume is achieved if corresponding physical variables of a sensor element or a sensor region of the cylinder housing are detected , Wherein the sensor element or the sensor region are selected such that they are acted upon indirectly by the pressure of the liquid medium in the cylinder volume via the sealing element penetrated by the piston. This avoids that mechanical losses, in particular friction losses interfere with the accuracy.
  • the sensor element is designed as a socket part, which extends through the piston of the piston-cylinder unit.
  • the cylinder housing itself may also have a sensor area, which is formed like a bush and which is penetrated by the piston.
  • a support element can be provided between the sensor element formed as a socket part or the sleeve-like sensor region and a sealing element which also protrudes from the piston and seals the cylinder volume against the piston and the cylinder housing, wherein the socket part or the sleeve-like sensor area preferably adjoins an indirectly facing the cylinder volume end face, ie is acted upon by the pressure of the liquid medium via the sealing element and the support element.
  • the sensor device is designed such that it detects a mechanical deformation of the sensor element or of the sensor region as a result of forces exerted thereon by the pressure in the cylinder volume.
  • the sensor device may have as an actual sensor at least one strain gauge, which is arranged on the sensor element or the sensor area.
  • strain gauges for example, connected as a measuring bridge, can be used to detect mechanical deformations.
  • the sensor element or the sensor region may also consist of a piezoelectric material, wherein the sensor device is designed to detect the voltage which is generated by the mechanical deformation of the sensor element or of the sensor region.
  • the sensor element or the sensor region can consist of a magnetostrictive material, wherein the sensor device is designed to detect the magnetization of the sensor element or of the sensor region, which is generated by the mechanical deformation of the sensor element or of the sensor region.
  • the actual sensor can be designed in any desired manner, for example also as an optical sensor, which is designed to detect mechanical stresses and / or deformations of the sensor element or of the sensor region.
  • At least the first piston-cylinder unit is provided with such a sensor. provided sor arthritis.
  • a pump control device can then use the signal of the sensor device of the at least one piston-cylinder unit to control the drive device for the piston-cylinder units depending on the signal of the at least one sensor device so that at the output port of the double piston pump in the transition phase between the Delivery phases during which the medium is conveyed exclusively by one of the two piston-cylinder units, the flow rate of the medium is substantially constant or has a deviation from a predetermined value for the flow rate, which is less than a maximum predetermined deviation.
  • the drive device can in each case have two separate partial drive devices for each one of the piston-cylinder units or be designed as a common drive device, for example in the usual way as a coupled cam gear.
  • a multi-piston pump in which two or more piston-cylinder units are connected in parallel with one sensor device, points in the fluidic path before the output port of each piston-cylinder unit or in the fluidic path between the output port of each piston-cylinder unit and in each case an associated port of a T-joining unit in each case a valve, which may be formed in the usual way as a check valve.
  • the output port of the T-merging unit forms the output port of the multi-piston pump.
  • a pump control also uses in this case the signals of the sensor devices to the drive means for the piston-cylinder units depending on the signals of the sensor devices to control so that at the output port of the multiple piston pump even in the transition phase between the delivery phases, during which the medium exclusively from a the piston-cylinder units is conveyed, the flow rate of the medium is substantially constant or has a deviation from a predetermined value for the flow rate, which is smaller than a predetermined maximum deviation.
  • the two or more piston-cylinder units of such double or multiple piston pumps are formed in a common housing.
  • the pump control device can detect the value of the signal of the at least one sensor device at the end of each compression phase or at the end of predetermined compression phases of the relevant piston-cylinder unit as a reference value and select. During the following compression phase or during several subsequent compression phases, compare with the respective currently detected values of the relevant signal and, when the reference value or a value derived therefrom, control the drive device such that the flow rate of the medium at the output port of the multiple piston pump is substantially constant even in the transition phase is or has a permissible deviation.
  • Figure 1 is a schematic representation of a double piston pump with two series-connected piston-cylinder units.
  • Figure 2 is a schematic representation of a double piston pump with two parallel piston-cylinder units.
  • Fig. 3 is a schematic representation of a piston-cylinder unit according to the invention with a sensor device for detecting the pressure in the cylinder volume.
  • FIG. 1 schematically shows a double-piston pump 1 with a first piston-cylinder unit 3 and a second piston-cylinder unit 5 connected in series therewith.
  • the input port 7 of the double-piston pump 1 simultaneously forms the input port of the first piston-cylinder unit 3. This is connected to a reservoir 9 for a liquid medium to be conveyed.
  • An output port 1 1 of the first piston-cylinder unit 3 is connected to an input port 13 of the second piston-cylinder unit 5.
  • An output port 15 of the second piston-cylinder unit 5 simultaneously forms the output port of the double-piston pump 1.
  • a check valve 17, 19 is provided in each case.
  • the check valve 17 opens automatically when the piston 3a of the piston-cylinder unit 3 is moved back, ie, the cylinder volume is increased.
  • the check valve 19 is designed so that it is in this funding phase, the connection between the output port 1 1 of the first piston-cylinder unit 3 and the input port 13 of the piston-cylinder unit 5 blocks. During this phase, the piston-cylinder unit 5 can initially take over generating the flow of the medium to be delivered at the output port 15 alone.
  • a compression phase can begin.
  • the medium in the cylinder volume of the piston-cylinder unit 3 is initially compressed during this compression phase until the pressure in the cylinder volume corresponds to the pressure on the outlet side or the pressure in the cylinder volume of the piston-cylinder unit 5.
  • the check valve 19 is opened, so that during a transitional phase the flow generated at the output port 15 first due to a forward movement of both the piston 3a and the piston 5a by both piston Cylinder units 3, 5 is generated.
  • a pump control device 21 has to drive devices 23, 25 for the piston-cylinder units 3, 5 with respect to their drive speed so that at the output port 15 still results in the desired constant flow. For this purpose, a reduction of the drive speed is required.
  • the drive means 23, 25 shown as a separate drive means for the piston-cylinder units 3 and 5, respectively.
  • a single drive device can be provided, which has two outputs for each one of the pistons 3a, 5a. The output speeds can then be mechanically coupled, for example. If, as shown in FIG. 1, two separate drive devices 23, 25 are used, they can be individually controlled by the pump control device 21. As a result, a higher flexibility is achieved.
  • the pump controller 21 must drive the actuators 23, 25 so that the drive speed (at least for the drive means 25) is increased again to ensure the desired constant flow at the output port 15.
  • the piston movement of the piston 3a is reversed again and a re-compression phase begins. The above procedure is repeated cyclically.
  • FIG. 2 shows a double-piston pump 40 which has two piston-cylinder units 30, 50 connected in parallel.
  • An input port 60 of the double piston pump 40 is in turn connected to a reservoir 9 for the liquid medium to be delivered.
  • the input port 60 is connected to a branching unit 62, which connects the fluid flow via a respective output 62a, 62b, each with an input port 32, 52 of the piston-cylinder units 30, 50.
  • Output ports 34, 54 of the piston-cylinder units 30, 50 are each connected to an input 64a, 64b of an assembly unit 64, the output of which simultaneously represents the output port 66 of the double-piston pump 40.
  • a pump control device 68 controls drive means 70, 72 for the piston-cylinder units 30, 50 so that at the output port 66 of the desired constant flow of the medium to be conveyed alternately only one the two piston-cylinder units 30, 50 is generated. Accordingly, the drive means 70, 72 are driven so that their cyclic movements have a predetermined phase shift, for example, 180 °. For example, if the flow at the outlet port 66 is generated exclusively by the piston-cylinder unit 30 during a certain delivery phase, then the cylinder volume of the piston-cylinder unit 50 can be initially filled by moving the respective piston back with the liquid medium (intake phase) ).
  • both piston-cylinder units 30, 50 each have two check valves 36, 38 and 56, 58, whose functioning is that of the non-return valves 17, 19 of the piston-cylinder unit 3 of the double piston pump 1 according to FIG. 1 corresponds.
  • check valve 36, 56 of the respective piston-cylinder unit is opened and the corresponding check valve 38, 58 is closed.
  • first both check valves 36, 38 and 56, 58 are closed.
  • the pump control device 68 must also ensure that the forward movement of the pistons of the two piston-cylinder units 30, 50 is reduced so that even during the transition phase a constant flow is generated at the exit port 66. It is thus necessary to reduce the drive speed of the pistons accordingly.
  • This transitional phase is terminated by the pump control device 68 controlling the relevant drive device 70, 72 of that piston-cylinder unit 30, 50, which exclusively generated the flow at the output port 66 before the transitional phase, into a backward movement.
  • the check valve in question closes at the output port 34, 54 of the respective piston-cylinder unit 30, 50 and opens the associated non-return valve 32, 52 at the inlet of the respective piston-cylinder unit 30, 50.
  • a new intake phase for the respective piston-cylinder unit 30, 50 begins.
  • the respective other piston-cylinder unit 30, 50 assumes during this intake phase and the subsequent compression phase of the other piston-cylinder unit, the exclusive generation of the flow at the output port 66. This sequence of operations is in turn cyclically repeated.
  • these times can be determined by detecting values of a physical quantity that represents a measure of the pressure in the relevant cylinder volume.
  • the resulting disadvantages, such as the introduction of an additional dead volume or the use of pressure sensors, which each come into contact with the liquid medium, should be avoided according to the invention.
  • FIG. 3 shows a schematic representation of a piston-cylinder unit 100 which has a sensor device 110 for detecting a physical quantity which has a measure of the pressure of the liquid medium in the cylinder volume 102.
  • the piston-cylinder unit 100 has a cylinder housing 104, in which a recess 106 is provided, in which a piston 108 is guided displaceably.
  • the recess 106 may be cylindrical, for example.
  • the recess 106 of the piston-cylinder unit 100 widens stepwise, wherein in this area an annular sealing element 1 12 is provided, which is penetrated by the piston 108.
  • the sealing element 12 seals a front part of the recess 106 (which in the embodiment in FIG. 3 is essentially formed by the cylindrical part with a smaller cross-section). from a rear part of the recess 106 from. Also with respect to the outer periphery of the piston 108, a sealing effect is achieved.
  • the sealing element may for example consist of a sufficiently flexible and inert plastic material, for example of PE, PTFE or PEEK.
  • a support member 1 14 is disposed on the rear side of the sealing member 1 12. This supports the annular sealing element 1 12 on the entire surface of the rear end face of the sealing element 1 12.
  • the support member 1 14 is also annular and is penetrated by the piston 108.
  • the support member 1 14 is made with sufficiently small tolerances, so that there is virtually no or at most a very small annular gap both with respect to this sweeping piston 108 and against the inner wall of the widening portion of the recess 106.
  • the rear end face of the support element 1 14 is acted upon in the embodiment shown in Fig. 3 by a sensor element 1 16, which is designed as a socket part.
  • the sensor element 1 16 is also penetrated by the piston 108 and fixed by means of a mounting plate 1 18 of the cylinder housing 104 in the recess 106.
  • the sensor element 16 has in its rear region a flange 16a, which rests on the surface of the part of the cylinder housing 104 in which the recess 106 is provided.
  • the sensor element 1 16 is held sufficiently accurate in the recess 106.
  • the sensor 120 may be formed, for example, as a strain gauge, optical sensor or the like.
  • the sensor element 1 16 or a suitable portion may consist of a piezoelectric material or a magnetorestrictive material.
  • the sensor element 1 16 and the support member 1 14 made of a sufficiently solid / hard material which is able to absorb compressive forces or stresses and maintain this level, which of an optionally extremely high pressure in the cylinder volume 102 are exerted on the sealing element 1 12.
  • the sensor device 110 also includes a sensor unit 122 which is designed such that it can be connected by an electrical or mechanical connection or in another suitable manner depending on the design of the sensor 120 the sensor 120 generates a signal which corresponds to the pressure of the medium in the cylinder volume 102 or at least sufficiently correlated with it. In this case, both relative or absolute pressure values can be determined, depending on the requirements of the further processing of the signal in a pump control device 124 connected to the sensor unit 122.
  • the pump control device 124 generates the sensor device 110 or the sensor unit 122 depending on the signal supplied to it Signal, with which a drive device 126 is driven, which is coupled to the piston 108.
  • a separate sensor element 1 16 which can be arranged in the housing 104 of the piston-cylinder unit 100, offers the advantage that results in a simple assembly and the sensor element in the case of a defect of the sensor 120 can be easily replaced.
  • the cylinder housing 104 in such a way that on the sealing element and possibly a support element forces that in consequence of in the cylinder volume 102 existing pressure on an integrally connected to the housing sensor area are exercised. The sensor may then be connected at a suitable position to the sensor area of the cylinder housing.
  • the front region of the sensor element 16 can still protrude into the part of the recess 106, in which the support element 14 is also arranged.
  • this part of the sensor element 1 16 no longer has to be manufactured with such high accuracy as the support element 1 14, since the front end face of the sensor element 1 16 only has to fix the support element 1 14 in its position.
  • the cross section of the sensor element 1 16 can also be significantly smaller than the cross section of the portion of the recess 106, in which the support member 1 14 and the sealing element 1 12 are held.
  • the support member 1 14 protrude with its rear end side of the respective portion of the recess 106 out into a further portion of the recess 106, which again has a much larger cross-section.
  • the front region of the sensor element 16 (and also its front end side) acting on the rear end side of the support element 14 can also have a significantly larger cross-section than the support element 14 (or its rear end side).
  • piston-cylinder units 100 may be combined according to known embodiments for multi-piston pumps. You can also be provided in a common cylinder housing.
  • a check valve which opens automatically when the pressure of the medium in the cylinder volume 102 is greater than or equal to the pressure of the medium on the high pressure side, that is at the output port 130, is.
  • the further check valve 134 which is arranged in front of the input port 136 of the piston-cylinder unit 100, closed. This opens automatically when the pressure of the medium in the cylinder volume 102 is less than the pressure of the medium on the high pressure side, in which case the check valve 132 is of course closed.
  • piston-cylinder units 100 can be connected as shown in FIG. 3, as is the case in Fig. 2 for the realization of a multi-piston pump with parallel piston-cylinder units.
  • the signal or signals of the sensor units of the further piston-cylinder units 100 can then also be fed to the pump control device 124, as indicated in FIG. 3, which then also supplies the signal (s) for controlling the drives for the other piston and cylinder units. Cylinder units 100 generated.
  • the plurality of drives for the plurality of piston-cylinder units 100 may also be designed as a single drive with a plurality of, for example mechanically coupled, drives for the respective pistons.
  • piston-cylinder unit 100 shown in FIG. 3 must be coupled to a further piston-cylinder unit, which however does not have to have check valves.
  • This additional piston-cylinder unit does not have to have a sensor unit.
  • a sensor unit according to the embodiment in Fig. 3, said sensor unit generates a signal which corresponds to the pressure of the medium on the high pressure side.
  • This signal can also be supplied to the pump control device, wherein the pump control device can compare the values of the signal which corresponds to the pressure on the high-pressure side with the values of the signal of the medium in the cylinder volume of the working piston-cylinder unit (this is the piston Cylinder unit, which is connected with its input port to the reservoir of the medium to be delivered). The times for reducing the drive speed for the pistons can then be determined from this comparison of the sensor signals.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Reciprocating Pumps (AREA)

Abstract

L'invention concerne une unité cylindre-piston pour une pompe à piston, en particulier pour la chromatographie liquide à haute performance, comprenant au moins une unité cylindre-piston (100) destinée à transporter un milieu liquide d'un volume de cylindre (102) à un orifice de sortie (130) par déplacement d'un piston (108), le piston (108) faisant saillie par un élément d'étanchéité (112) entourant axialement ce dernier dans le volume de cylindre (102). Ladite unité comprend également un dispositif d'entraînement (126) destiné à entraîner le piston (108) de la ou des unités cylindre-piston (100) et comprend également un dispositif de détection (110) destiné à détecter des valeurs relatives ou absolues pour la pression du milieu liquide dans le volume de cylindre (102). Selon l'invention, le dispositif de détection (110) comprend un élément de détection (116) ou une zone de détection du boîtier de cylindre (104), l'élément de détection (116) ou la zone de détection étant indirectement ou directement soumis(e) à l'effet de la pression du milieu liquide dans le volume de cylindre (102). Le dispositif de détection (110) détecte des valeurs absolues ou relatives d'une grandeur physique de l'élément de détection (116) ou de la zone détection représentant une mesure pour la pression du milieu liquide dans le volume de cylindre (102), et produit en fonction des valeurs détectées un signal qui représente une mesure pour la pression agissant dans le milieu liquide dans le volume de cylindre (102). L'invention concerne en outre une pompe à pistons multiples dotée d'au moins une unité cylindre-piston (100) de ce type.
PCT/DE2012/100060 2011-03-17 2012-03-09 Unité cylindre-piston pour pompe à piston, en particulier pour la chromatographie liquide à haute performance Ceased WO2012122977A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011001378.4 2011-03-17
DE201110001378 DE102011001378A1 (de) 2011-03-17 2011-03-17 Kolben-Zylinder-Einheit für eine Kolbenpumpe, insbesondere für die Hochleistungsflüssigkeitschromatographie

Publications (1)

Publication Number Publication Date
WO2012122977A1 true WO2012122977A1 (fr) 2012-09-20

Family

ID=46196970

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2012/100060 Ceased WO2012122977A1 (fr) 2011-03-17 2012-03-09 Unité cylindre-piston pour pompe à piston, en particulier pour la chromatographie liquide à haute performance

Country Status (2)

Country Link
DE (1) DE102011001378A1 (fr)
WO (1) WO2012122977A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017103845A1 (fr) 2015-12-16 2017-06-22 Agilent Technologies, Inc. Pompe à fluide munie d'un piston et d'un élément de support lui servant d'appui à des fins d'étanchéité
WO2019164918A1 (fr) * 2018-02-26 2019-08-29 Valco Instruments Company, L.P. Pompe pour chromatographie en phase liquide avec capteur de pression

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1394648A (en) * 1972-05-17 1975-05-21 Toyo Soda Mfg Co Ltd Liquid chromatography apparatus
EP1918585A2 (fr) * 2006-10-28 2008-05-07 Pfeiffer Vacuum Gmbh Pompe à vide
WO2008127471A1 (fr) * 2007-04-17 2008-10-23 Leman William W Procédés et appareil pour un piston de pompe à fluide ou à boue
US20100143155A1 (en) 2008-04-02 2010-06-10 Preiswerk Thomas Piston Pump Having A Force Sensor And A Method For Controlling Said Pump
US7850844B2 (en) 2007-08-28 2010-12-14 Hitachi High-Technologies Corporation Liquid delivery device, liquid chromatograph, and method for operation of liquid delivery device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3943224A1 (de) * 1989-12-23 1991-07-04 Wissenschaftliche Geraetebau D Verfahren und vorrichtung zur messung und regelung des ausgangsflusses von schubkolbenpumpen
JP3491948B2 (ja) * 1993-03-05 2004-02-03 ウォーターズ・インベストメンツ・リミテッド 溶剤ポンプ送り装置
DE102007055747A1 (de) * 2007-12-10 2008-07-31 Agilent Technologies Inc., Santa Clara HPLC-Pumpe mit Kraftmesskörper zwischen Antriebskörper und Pumpenkopf zum Messen der Klemmkraft
DE102008037393B4 (de) * 2008-09-25 2015-01-22 Friedrich-Alexander-Universität Erlangen-Nürnberg Verfahren zur Früherkennung von Ventilschäden in oszillierenden Verdrängerpumpen und oszillierende Verdrängerpumpen mit integrierter Sensorik zur Verwendung in diesen Verfahren

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1394648A (en) * 1972-05-17 1975-05-21 Toyo Soda Mfg Co Ltd Liquid chromatography apparatus
EP1918585A2 (fr) * 2006-10-28 2008-05-07 Pfeiffer Vacuum Gmbh Pompe à vide
WO2008127471A1 (fr) * 2007-04-17 2008-10-23 Leman William W Procédés et appareil pour un piston de pompe à fluide ou à boue
US7850844B2 (en) 2007-08-28 2010-12-14 Hitachi High-Technologies Corporation Liquid delivery device, liquid chromatograph, and method for operation of liquid delivery device
US20100143155A1 (en) 2008-04-02 2010-06-10 Preiswerk Thomas Piston Pump Having A Force Sensor And A Method For Controlling Said Pump

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017103845A1 (fr) 2015-12-16 2017-06-22 Agilent Technologies, Inc. Pompe à fluide munie d'un piston et d'un élément de support lui servant d'appui à des fins d'étanchéité
WO2019164918A1 (fr) * 2018-02-26 2019-08-29 Valco Instruments Company, L.P. Pompe pour chromatographie en phase liquide avec capteur de pression
US11002262B2 (en) 2018-02-26 2021-05-11 Valco Instruments Company, L.P. Pump for liquid chromatography with pressure sensor

Also Published As

Publication number Publication date
DE102011001378A1 (de) 2012-09-20

Similar Documents

Publication Publication Date Title
DE102012105323B4 (de) Steuervorrichtung zur Steuerung einer Kolbenpumpeneinheit für die Flüssigkeitschromatographie, insbesondere die Hochleistungsflüssigkeitschromatographie
EP2935860B1 (fr) Pompe à carburant à piston pour moteur à combustion interne
DE112011102529B4 (de) Pumpe für Flüssigchromatographen und Flüssigchromatograph
EP2235519B1 (fr) Dispositif de distribution d'échantillon pour chromatographie en phase liquide, en particulier pour chromatographie en phase liquide à haute performance
DE102011052848B4 (de) Vorrichtung zur Steuerung einer Kolbenpumpeneinheit für die Flüssigkeitschromatographie
DE2612609A1 (de) Pumpensystem
DE102009013853A1 (de) Fehlertolerantes Chemikalien-Einspritzsystem für Öl- und Gasbohrlöcher
EP2278150A1 (fr) Dispositif pour l'atténuation des pulsations de pression dans un système de fluide, en particulier dans un système de carburant d'un moteur à combustion interne
EP2913526A1 (fr) Procédé de transport de fluide hydraulique et unité de pompe/moteur électrohydraulique associée
DE102010036204A1 (de) Schließeinheit
DE112013003747T5 (de) Flüssigkeitschromatographiegerät und Flüssigkeitsabgabegerät
EP2636901B1 (fr) Dispositif à haute pression pour fluides liquides
DE102021202041A1 (de) Stangendichtsystem und Zylinderkopf für einen Hydraulikzylinder
EP2895744B1 (fr) Pompe syringe pour un dosage sans pulsations et un mélange précis dans le domaine hplc, uhplc, micro- et nano-hplc
WO2012122977A1 (fr) Unité cylindre-piston pour pompe à piston, en particulier pour la chromatographie liquide à haute performance
EP1388404B1 (fr) Ensemble hydraulique pour une machine de moulage par injection
DE102011004378B4 (de) Verfahren zur Funktionskontrolle eines Speichereinspritzsystems
EP2446910A1 (fr) Pompe et procédé de transport d'un fluide et corps creux pour une pompe
EP3441612B1 (fr) Unité de pompe, dispositif de stockage équipé d'une telle unité de pompe et procédé de fonctionnement dudit dispositif de stockage
EP3904679B1 (fr) Procédé de fonctionnement d'une pompe à piston à double action, pompe à piston à double action ainsi que système d'application permettant d'appliquer un milieu fluide à un substrat
DE19746490A1 (de) Kraftstoffeinspritzanlage für eine Brennkraftmaschine
DE102008014340B4 (de) Fassfolgepumpe
DE102016109457A1 (de) Dosiereinrichtung mit Drucksensor
EP3460447B1 (fr) Dispositif d'essai de tension de fracture
DE102008048450B4 (de) Saugventil für einen Zylinder der Kraftstoff-Hochdruckpumpe eines Common-Rail-Einspritzsystems

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12724560

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 1120120012771

Country of ref document: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12724560

Country of ref document: EP

Kind code of ref document: A1