EP2760584A1 - Procédé et dispositif pour doser un fluide de travail - Google Patents

Procédé et dispositif pour doser un fluide de travail

Info

Publication number
EP2760584A1
EP2760584A1 EP12769642.5A EP12769642A EP2760584A1 EP 2760584 A1 EP2760584 A1 EP 2760584A1 EP 12769642 A EP12769642 A EP 12769642A EP 2760584 A1 EP2760584 A1 EP 2760584A1
Authority
EP
European Patent Office
Prior art keywords
fluid
pumping
working fluid
pumping chamber
pressure
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Withdrawn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
EP12769642.5A
Other languages
German (de)
English (en)
Inventor
Harald Gentischer
Daniel Biro
Jan Specht
Florian Clement
Maximilian Pospischil
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.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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 Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Publication of EP2760584A1 publication Critical patent/EP2760584A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/02—Burettes; Pipettes
    • B01L3/0241—Drop counters; Drop formers
    • B01L3/0268—Drop counters; Drop formers using pulse dispensing or spraying, eg. inkjet type, piezo actuated ejection of droplets from capillaries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/02—Burettes; Pipettes
    • B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
    • G01F11/02—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement
    • G01F11/08—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the diaphragm or bellows type
    • G01F11/086—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the diaphragm or bellows type using an auxiliary pressure to cooperate with the diaphragm or bellows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2300/00—Additional constructional details
    • B01L2300/12—Specific details about materials
    • B01L2300/123—Flexible; Elastomeric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2400/00—Moving or stopping fluids
    • B01L2400/06—Valves, specific forms thereof
    • B01L2400/0633—Valves, specific forms thereof with moving parts
    • B01L2400/0638—Valves, specific forms thereof with moving parts membrane valves, flap valves

Definitions

  • the invention relates to a device and a method for dosing a bayfiuids.
  • fluids are delivered during dosing with the aid of pumps, such as diaphragm pumps, gear pumps, gerotor pumps, peristaltic pumps, peristaltic pumps or piston pumps.
  • pumps such as diaphragm pumps, gear pumps, gerotor pumps, peristaltic pumps, peristaltic pumps or piston pumps.
  • the fluid to be metered is provided in a plastic cartridge and is pressed directly, for example by compressed air from the cartridge or by a mechanically driven piston exerts a force on the fluid in the cartridge.
  • fluidic conveying devices which operate according to the extruder or screw conveyor principle are also known.
  • the challenge with dosing is not only to deliver and dispense a fluid, but also to control the delivered and dispensed amount with the accuracy needed for the particular application. If the application permits it, then gravimetric measuring methods are used to measure the quantity delivered. In this case, the mass of the dispensed fluid is determined at the issuing point during the dosing with a weighing device. In this case, only small demands are placed on the conveying accuracy of the fluidic conveying device, since the measuring accuracy is limited only by the accuracy of the weighing device.
  • volumetric metric method In favorable cases, flow meters can be used. In other cases, even the knowledge about the displacement volume of the fluidic conveying device is sufficient in dependence on the relative driving position of the displacing parts of the fluid conveying device in order to determine the conveyed quantity of the fluid. For example, in systems where the fluid is pushed directly out of a cartridge, the delivered amount of media may be determined by multiplying the piston area by the offset of the piston position. In contrast, when the fluid in these devices is displaced with the aid of compressed air, 10 usually time / pressure controlled control systems are used. In this case, one forms the integral of the pressure curve in the cartridge over time in conjunction with a mathematical model of the flow behavior of the respective fluid in the cartridge and in all connection and connection elements to the exit point.
  • the mechanical clearance is necessary in order to prevent parts of the dosing pump from becoming jammed by the particles embedded in the fluid or to prevent the stored particles from being deformed by moving parts of the fluidic conveying device.
  • the game results in that the achievable pressure is limited, thus only fluids can promote up to a bestimmst) th viscosity. As much as this increases the slippage of the fluidic delivery device, one loses the ability to determine the amount delivered via the displacement volume of the device.
  • the abrasive property of the stored particles leads to the progressive wear of all parts of the fluidic conveying device, which come into contact with the flowing medium. An undesirable consequence is in addition the wear of the device also the fact that the medium is contaminated by the particles removed by parts of the device.
  • Another form of complication are fluids with aggressive chemical or harmful properties. If such substances are promoted, only materials resistant to the respective substances can be used for the parts of the fluidic delivery device and for supply and discharge lines. This may result in restrictions on the achievable operating parameters. In addition, the expense of cleaning the device can be a high level and, as well as the provision of such fluids, pose a hazard to operators.
  • thixotropic fluids For filled, thixotropic fluids, it is particularly difficult to predict the flow properties because they exhibit non-Newtonian behavior, ie, the flow properties change in particular depending on the pressure and on the respective flow velocity at each individual point of the conveying path. External influences, such as temperature and air pressure, must also be taken into account from a specific dosing accuracy value. Even with the slightest changes to the system or the external conditions, for example when a different nozzle is used, the mathematical model has to be adapted in a complex manner. Particularly unfavorable is the fact that separate, extremely complex Theological investigations must be carried out for each fluid used to determine the parameters necessary for operation for calculating the flow behavior.
  • the difficult-to-calculate expansion behavior of the cartridge as a function of the pressure in the cartridge and of the ambient pressure must also be included in the calculation. Even if this is successful, the elongation of the cartridge in each Einzeldosiervorgang leads to a time lag between the time of pressure build-up and reaching the yield point of the fluid and thus to a delay of the fluid output, whereby the number of Einzeldosiervor réelle per unit time is severely limited. Slightly better accuracy values can be achieved if the fluid-displacing force is not introduced by means of compressed air but with a mechanically driven piston. Limiting factors in this variant, however, continue to be the expansion behavior of the cartridge and the positioning accuracy of the piston.
  • a device for dosing liquids comprising an optical fluid measuring device is disclosed in DE 10 2008 016 513 A1.
  • a device for dosing small amounts of liquid with dispensing from a Suction volume is disclosed in DE 197 42 005 A1, a volumetric working
  • the present invention has for its object to provide a method and apparatus for metering a working fluid to output working fluids with a wide range of material parameters, in particular viscosities, with improved dosing accuracy.
  • the method according to the invention and the device according to the invention are intended to improve the metering of pasty working fluids and / or working fluids provided with solid particles with regard to the metering accuracy.
  • the inventive method is preferably designed for implementation by means of the device according to the invention and / or a preferred embodiment thereof.
  • the device according to the invention is preferably designed for carrying out the method according to the invention and / or a preferred embodiment thereof.
  • the invention is based on the Applicant's finding that, although pumps are known for high-precision metering, such high-precision metering pumps achieve the desired high accuracy only with liquids of particular parameters, in particular liquids in a certain viscosity range. When using such pumps for working fluids with different physical parameters, in particular different viscosities, thus fluctuates the dosing accuracy. In addition, highly viscous working fluids, such as pastes, are often not suitable for use with high accuracy dosing pumps.
  • a first aspect of the invention therefore consists in the inventive method and the invention Device to promote a defined volume of an incompressible pumping fluid by means of a metering pump, which pumping fluid in turn leads by displacement to a synchronous output of the working fluid:
  • the inventive method for metering a working fluid comprises the following method steps:
  • a working fluid is provided within a pressure-stable and dimensionally stable pumping chamber.
  • Pressure-stable here and below means that the pumping chamber is on the one hand dimensionally stable with respect to the intrinsic pressure occurring in the pumping chamber during use and, on the other hand, dimensionally stable with respect to the ambient pressure acting on the pumping chamber.
  • dimensionally stable means in this case and in the following that no or at least essentially none or a negligible deformation of the components through which fluid flows in the region of the required metering accuracy takes place due to the action of pressure.
  • step A an incompressible feeding takes place
  • the pump chamber is subdivided into a pump fluid region and a working fluid region, in a first variant I a flexible membrane forming the interface is arranged in the pumping chamber or in a second variant I I the pumping fluid directly adjoins the working fluid at the interface.
  • the working fluid is dispensed from at least one working fluid opening of the pumping chamber, in that the working fluid in the pumping chamber is displaced by supplying the pumping fluid.
  • the inventive method thus differs in at least two essential aspects of the prior art method for dosing an incompressible working fluid, on the one hand a decoupling between metering pump and working fluid takes place such that by means of the metering pump only an incompressible pumping fluid is promoted and on the other hand in terms of the operation of a dosing a complete mechanical coupling is achieved between the pumping fluid and Häfiuid by a flexible membrane (variant I) is disposed at an interface in the pumping chamber or the pumping fluid directly adjacent to the Häfiuid ⁇ variant II), this results in particular the advantages that pumping fluid and metering pump with respect to a maximum possible Metering accuracy can be optimized.
  • the physical properties of the pumping fluid can be chosen such that the greatest possible metering accuracy is achieved by means of the metering pump used.
  • the dosing accuracy is substantially due to the dosing accuracy, by which the metering pump promotes the pumping fluid, due, so that the dosing accuracy achieved is largely independent of the Häfiuid used.
  • the interface between working fluid and pumping fluid is either formed by a flexible membrane or the pumping fluid immediately adjoins the working fluid. As a result, a significantly larger range of working fluids can be metered with higher accuracy, compared to previously known dosing methods.
  • the invention is based in particular on the recognition of the Applicant that the highest possible dosing accuracy values can be achieved if the dosing quantity does not have to be measured either directly or indirectly, but in which the desired volume to be dispensed can be deliberately and reliably pre-determined with a suitable device. This is realized with the method according to the invention.
  • the device according to the invention for metering a working fluid comprises a pressure-stable and dimensionally stable pumping chamber and a metering pump for conveying an incompressible fluid
  • the metering pump is connected via a fluid line with a pumping fluid opening of the pumping chamber in order to supply and / or discharge pumping fluid and the pumping chamber has at least one working fluid opening in order to supply and / or remove a working fluid.
  • the pumping chamber is designed in such a way that, in use, an interface between the pumping fluid and the working fluid is formed in the pumping chamber, which interface divides the pumping chamber into a pumping fluid region in which the pumping fluid opening m opens and a working fluid region in which the working fluid orifice opens, wherein in a variant I, an interface forming the flexible membrane is arranged in the pumping chamber or in a variant II, the pumping fluid at the interface directly adjacent to the working fluid.
  • the device according to the invention also has the aforementioned advantages of the method according to the invention.
  • the pumping chamber for receiving a working fluid-containing cartridge is formed with an at least partially flexible designed cartridge wall.
  • at least the flexibly formed part of the cartridge wall forms the flexible membrane according to variant I.
  • the working fluid can be provided in a simple manner according to method step A by arranging the cartridge in the pumping chamber.
  • the pumping chamber has seals and / or a closure system for fluid-tight application of the cartridge walls to walls of the pumping chamber, so that after arranging the cartridge in the pumping chamber, the area not executed by the cartridge in the pumping chamber is fluid-tight and only via the pumping fluid opening a volume exchange is possible.
  • the flexible membrane is arranged in the pumping chamber and fluid-tightly connected to one or more walls of the pumping chamber.
  • the distribution of the pumping chamber in the pumping fluid region and working fluid region is given by the membrane and the volume changes of these regions, ie for example enlargement of the volume of the pumping fluid region and at the same time reduction of the volume of the working fluid region for dispensing working fluid, take place by deformation and / or stretching of the membrane
  • the membrane is formed after a bubble, which bubble is arranged within the pumping chamber and only has an opening which encloses the pumping fluid opening or in another preferred embodiment, the working fluid opening.
  • pump fluid can thus be fed into the bladder opening and thus into the bladder via the pump fluid opening and can be discharged from the bladder.
  • working fluid can be introduced into the bladder through the bladder opening via the working fluid opening or out of the bladder.
  • the metering accuracy of prior art metering systems is surprisingly affected to a degree not to be neglected by fluctuations in the ambient pressure.
  • at least the flow path between the metering pump and the pumping chamber is pressure-stable with respect to ambient pressure acting on the device.
  • the metering pump is connected in a fluid-conducting manner to the pumping chamber via lines which are stable in terms of external pressure and internal pressure and are dimensionally stable.
  • the volume flowing into the pumping chamber corresponds at all times to the effluent at the working fluid openings Volume.
  • a relief valve is opened, which is pressure-compensating connected to an environment and the pumping fluid region and / or the working fluid region of the pumping chamber.
  • the relief valve may be formed as a vent valve, as described below in an advantageous manner.
  • a flexible surge tank can be provided which can be connected via the relief valve. Til fluidly connected to the pumping fluid region and / or the working fluid region of the pumping chamber, so that when the relief valve is open
  • the relief valve is connected to the working fluid portion of the pumping chamber to efficiently provide pressure equalization with the environment upon completion of the dosing operation.
  • the aforesaid preferred embodiment comprising a relief valve is particularly useful in dynamic printing operations, i. H. Printing processes in which a plurality of Dosiermengen, in particular in a short cycle must be delivered, advantageous.
  • a plurality of Dosiermengen in particular in a short cycle must be delivered
  • highly dynamic metering operations are required, so that in particular in such an application, the previously described advantageous embodiment comprising a relief valve considerable advantages in terms Dosing accuracy offers.
  • the relief valve is closed before method step B, preferably before method steps A and B, so that regardless of the ambient pressure, the supply of a predetermined volume of the pumping fluid or on the provision of the working fluid.
  • Applicant's investigations have furthermore shown that the dosing accuracy can still be impaired by an output delay in process step B.
  • the feeding of the predetermined volume of the incompressible pumping fluid in process step B leads to an output of the working fluid from the working fluid opening only with a time delay. This may be due to the fact that no complete venting has taken place or that at other places there are at least slightly compressible elements or volumes which thus result in no ideal pressure-stable system of incompressible liquids being present.
  • a pre-pressure which is in the range from 50% to 95%, preferably 85% to 95%.
  • a pre-pressure in the working fluid region of the pumping chamber is thus already generated before the actual dosing, but which form is below a pressure threshold for the output of working fluid.
  • a compression of any compressible volumes or other pressure-receiving elements is already achieved when building up the form, so that at the start of the actual dosing no or a significantly reduced delay is achieved until the output of the working fluid and thereby the dosing accuracy is further increased.
  • the application of a pre-pressure is preferably also via the metering pump and supplying pumping fluid in the pumping fluid region of the pumping chamber.
  • pressure sensors are preferably provided in the pumping chamber, preferably in the pumping fluid region of the pumping chamber, in order to build up a predetermined admission pressure in the pumping chamber by means of a likewise preferably provided control unit.
  • the pre-pressure described above can be generated by means of the metering pump. It is particularly advantageous, the admission pressure exclusively by means of a suction side of the pump arranged pressure source, in particular a one
  • the inlet pressure on the suction side of the metering pump is at least 90% of the pressure required to dispense working fluid. Since a pump is typically not absolutely pressure-tight even at a standstill, the pre-applied pressure on the suction side transmits at least attenuated even when the pump is stationary pressure on the pumping fluid and thus the pumping chamber and the working fluid in the working fluid.
  • the pumping chamber has a venting valve fluidly connected to the pumping fluid region.
  • a venting valve fluidly connected to the pumping fluid region.
  • the metering pump is connected in a fluid-conducting manner, on the one hand, to the pumping fluid filling of the pumping chamber and, on the other hand, to a pumping fluid reservoir.
  • the pumping fluid reservoir is pressure-stable in relation to the ambient pressure or designed to be closed in a pressure-stable manner.
  • pumping fluid can be provided in a simple manner for introduction into the pumping chamber and, when the pumping chamber is emptied, the pumping fluid pumped off from the pumping chamber can be stored again in the pumping fluid reservoir.
  • the pressure-stable design leads to an additional increase in the dosing accuracy, as in this preferred embodiment, the suction side of the metering pump ⁇ when pumping pump fluid into the pumping chamber) no or at least substantially no pressure fluctuations in a change in ambient pressure, or by the pressure fluctuations that resulting from the changes in the level in the pumping fluid reservoir, occur.
  • a compressed gas source it is particularly advantageous for a compressed gas source to be connected in a fluid-conducting manner to the pump fluid reservoir.
  • a constant pressure in the pumping fluid reservoir can be maintained even when removing pumping fluid by means of the compressed gas, so that in addition the pressure conditions are kept constant on the suction side of the metering pump and thus additionally the metering accuracy is increased.
  • a further increase in the dosing accuracy is achieved in a preferred embodiment in that a pressure control valve is arranged between the pump fluid reservoir and dosing pump, so that the pressure applied to the dosing pump can be regulated to a constant value by means of the pressure control valve on the suction side in order to increase the dosing accuracy even further.
  • a pressure control valve is arranged between the pump fluid reservoir and dosing pump, so that the pressure applied to the dosing pump can be regulated to a constant value by means of the pressure control valve on the suction side in order to increase the dosing accuracy even further.
  • step A pumping fluid is removed by means of the metering pump from the pumping chamber to generate a negative pressure in the pumping chamber and to introduce working fluid from a working fluid reservoir into the pumping chamber.
  • the metering pump can be additionally used to suck working fluid into the pumping chamber to provide the working fluid for a subsequent metering in the pumping chamber available.
  • a fluid line which is connected to a working fluid reservoir is connected to the working fluid opening and after provision of the working fluid in the pumping chamber this fluid line is removed again.
  • a working fluid reservoir is provided which is conductively connected to the working fluid region of the pumping chamber.
  • the working fluid reservoir it is particularly advantageous for the working fluid reservoir to be fiuid attired connected thereto via a second opening of the pumping chamber, so that this opening is thus formed as Pakistanfluidzu- opening to direct working fluid from the working fluid reservoir into the pumping chamber and continue the pumping chamber having the aforementioned working fluid opening which is thus formed in this preferred embodiment as Häfluidausgabeötechnisch.
  • the venting of the pumping chamber in the flow path between the working fluid reservoir and the pumping chamber and / or on the working fluid discharge opening optionally closable valves to close the working fluid dispensing opening when filling the working fluid area of the pumping chamber and to open the flow path between working fluid reservoir and pumping chamber ,
  • the working fluid reservoir is preferably pressure-stable with respect to the ambient pressure and is dimensionally stable or at least pressure-resistant and can be closed in a dimensionally stable manner.
  • a compressed gas source is provided, which is fluid-conductively connected to the working fluid reservoir.
  • a compressed gas source is provided, which is fluid-conductively connected to the working fluid reservoir.
  • the metering pump can be designed in the manner of known per se known conveying devices for incompressible pump fluids and it is basically at the discretion of the person skilled in the art to use any conveying device as a metering pump.
  • a pumping device which consists of a filled with pump fluid cylinder-piston unit, the piston by means of further hyd raulischer components and / or mechanical com ponents is movable, can also be used as a metering pump.
  • the metering pump is preferably designed as a piston, gear or tooth ring pum pe.
  • the individual components of the dosing pump used preferably have a sufficiently high degree of precision in interaction, so that elastic seals can be dispensed with and the dosing accuracy is increased hereby.
  • the pumping fluid preferably has Newtonian flow properties.
  • the viscosity of the pumping fluid is in the range between 5000 mPas and 40,000 mPas. In this area, according to experience, suitable metering pumps have the greatest tightness or the lowest slip.
  • gaseous working fluids it is within the scope of the invention to use gaseous working fluids.
  • a particularly high accuracy of the dispensed volume of the working fluid results in particular when using incompressible working fluids and in this case preferably from a liquid as the working fluid.
  • a hydraulic cylinder is preferably arranged so that a first volume of a first hydraulic cylinder with the Pumpfluido réelle the Pumpkamme and a first volume of the second hydraulic cylinder is fluidly connected to the metering pump.
  • the pistons of the two hydraulic cylinders are mechanically coupled such that a volume change in the first volume of the second cylinder due to the mechanical coupling of the pistons results in a volume change in the first volume of the second hydraulic cylinder. It is essential that the piston cross-sectional area of the second hydraulic cylinder is greater than the piston cross-sectional area of the first hydraulic cylinder.
  • a volumetric gear ratio is thus achieved by means of the metering pump, a first volume is conveyed, which leads to the introduction of a second volume of pumping fluid into the pumping chamber, wherein the first volume is greater than the second volume.
  • orzugswelse here is a gear ratio of at least 1: 2.
  • the transmission ratio is preferably selected according to the required dosing accuracy.
  • a further increase in the metering accuracy is achieved, since in particular small volumes can not be metered with high accuracy by means of a metering pump.
  • Due to the volumetric translations by means of the two hydraulic cylinders with different piston cross-sectional area a pumping fluid can thus be conveyed into the pumping chamber, by contrast, a larger volume by means of the metering pump for introducing a predetermined volume.
  • the two hydraulic pistons can be bridged by means of a bypass line, so that optionally there is a direct fluid-conducting connection between metering pump and pumping chamber, in particular in order to fill the pumping fluid region of the pumping chamber with pumping fluid.
  • a particularly simple embodiment of this selectively switchable bypass fluid line is obtained by a valve is arranged in the bypass fluid line and in a fluid id réelle between metering pump and second hydraulic cylinder also a valve is arranged.
  • the flow paths are preferably configured such that - when pumping fluid is pumped into the pumping chamber - a flow path branching is formed on the pressure side of the metering pump, whereby one branch via an optionally closable valve as a bypass line leads directly to the backfilling of the pumping chamber and the other branch via a second optionally closable valve opens into the first volume of the second cylinder-piston unit.
  • the device according to the invention and the method according to the invention are fundamentally suitable for applications in which a highly accurate metering of a working fluid is necessary.
  • it is particularly suitable for applications in which highly viscous working fluids are used, in particular working fluids having a high viscosity and / or fields of application where pasty working fluids are used and / or applications using solid state fluids and / or applications using non-Newtonian working fluids and / or aggressive or noxious chemical properties.
  • the device according to the invention and / or the method according to the invention are therefore preferably designed for the use of and / or are preferably used with
  • a non-Newtonian fluid as the working fluid, preferably one with
  • Solid particles filled fluid in particular with metal particles and / or ceramic particles (eg glass frit) filled fluid;
  • a preferred application relates to the production of photovoltaic solar cells:
  • process steps are often necessary in which a paste-like working fluid to be applied in one or more parallel tracks on a semiconductor substrate.
  • the pasty working fluid may be, for example, a metal particle-containing paste having a viscosity of bi to 500,000 mPas for producing a metallic contacting structure.
  • a dopant-containing paste for generating doping regions in the semiconductor substrate is possible.
  • inventive method and the device according to the invention are suitable for incompressible fluids.
  • the method according to the invention and the device according to the invention are also suitable for compressible fluids, in particular compressible gases, due to the high dosing accuracy.
  • Further preferred fields of application are:
  • FIG. 1 shows a first exemplary embodiment of a device according to the invention, in which a working fluid region of a pumping chamber is filled via a working fluid opening;
  • FIG. 2 shows a second embodiment of a device according to the invention, in which working fluid from a working fluid area via a
  • FIG. 1 shows a third embodiment according to the structure of Figure 1, which additionally comprises a volumetric translation device.
  • Figure 4 shows a fourth embodiment of a device according to the invention according to the second embodiment of Figure 2, which additionally has a volumetric translation device.
  • FIG. 1 shows a first exemplary embodiment of a device A for metering a working fluid 1.
  • a first embodiment of a method according to the invention will be further described.
  • the working fluid 1 is located in a cartridge 2.
  • the cartridge 2 is arranged in a pumping chamber 3 in a method step A.
  • the cartridge 2 has a working fluid opening 4 and, after insertion into the pumping chamber 3 at the edges of the working fluid opening 4, is connected in a fluid-tight manner to an edge of the pumping chamber 3 surrounding the working fluid opening 4.
  • the working fluid 1 is in each case designed as a printing paste provided with metal particles. forms.
  • the printing paste is applied to a semiconductor substrate, preferably a preliminary stage in the production process of a photovoltaic solar cell, to form a metallic contacting structure.
  • the enclosed by the cartridge 2 volume, which is filled with working fluid thus represents the working fluid in the pumping chamber 3.
  • a metering pump 5 which is designed for example as a gerotor pump is connected via a pressure-stable and dimensionally stable fluid line 8 with a pumping fluid opening of the pumping chamber 3 ,
  • the metering pump 5 is furthermore connected to a pump fluid reservoir 9 via a pressure-stable fluid line.
  • pumping fluid 6 can thus be conveyed out of the pumping fluid reservoir 9 into a pumping fluid region of the pumping chamber 3 by means of the metering pump 5. If necessary, in the
  • Pump fluid portion of the pumping chamber 3 located gas is discharged via a vent valve 7, wherein a collecting container 1 5 is provided to catch possibly exiting via the vent valve pumping fluid 6.
  • a predetermined amount of pumping fluid 6 is supplied to the pumping chamber 3 by means of the metering pump 5. Since the pumping fluid is incompressible and since both the pumping fluid and the working fluid share the volume contained in the pressure-stable and dimensionally stable pumping chamber, the volume of pumping fluid 6 supplied to the pumping chamber corresponds to the volume of working fluid 1 dispensed at the working fluid port 4.
  • the working fluid 1 is thus dispensed, since in the pumping chamber 3 by supplying pumping fluid 6, the volume of the pumped fluid area increases and correspondingly decreases due to displacement of the volume of the working fluid area.
  • the outer wall of the cartridge 2 is designed to be flexible and thus forms the flexible membrane between the pumping fluid region and the working fluid region. During the dispensing operation of working fluid 1, a pressure P is thus discharged into the pumping chamber 3 without any significant delay by supplying pumping fluid 6. built, which leads to a reduction of the volume of the working fluid in the pumping chamber 3.
  • the high dosing accuracy is thus on the one hand by the design of the metering pump as a high-precision metering pump in training, for example, as a toothed ring pump, which steals no elastic seals, guaranteed. Furthermore, at least the elements arranged in the region C are in each case pressure-stable and dimensionally stable, so that an internal volume enclosed by these elements does not change either with a change in the ambient pressure B or by the overpressure in the interior.
  • the metering pump 5 is on the suction side (in terms of the direction of flow when supplying pumping fluid 6 to the pumping chamber 3) via a fluid line with a
  • Pumpfluidreservoir 9 connected.
  • the fluid line between Pumpfluidreservoir 9 and metering pump 5 is also formed pressure stable to further increase the dosing accuracy.
  • a pressure-stable design is sufficient at this point, since before the pump only the constant pressure is important and not a constant volume.
  • a dimensionally stable design of this fluid line is therefore not absolutely necessary.
  • a pressure regulating valve 1 1 is provided, by means of which the suction side of the metering pump (conveying pumping fluid into the pumping chamber 3) applied pressure is predetermined, so achieved due to this suction side constantly applied to the metering pump during the delivery pressure, a further increase in dosing accuracy becomes.
  • the dosing accuracy is increased by the pumping fluid reservoir 9 formed pressure stable and pressure-sealed from the environment.
  • a constant gas pressure is generated in the region of the pumping fluid reservoir 9 not occupied by the pumping fluid by means of a compressed gas source 10 via a fluid line which has an optionally closable valve 13, so that additionally a pressure fluctuation on the suction side of the metering pump 3 is avoided.
  • pumping fluid is pumped out of the pumping chamber 3 by means of the metering pump 5 into the pumping fluid reservoir 9 by conveying inversion. In this case, the valve 13 is closed and a vent valve 14 is opened.
  • the dosing accuracy is increased, in particular in dynamic metering processes, by opening the venting valve 7 after method step B in a method step C so that pressure equalization between the pumping fluid region 6 'and the environment (via the collecting container open to the environment 15) is produced and thus an immediate termination of the output of working fluid from the working fluid opening 4 is achieved.
  • the bleeder valve 7 thus also serves as a relief valve in this preferred embodiment. Before the next dosing operation, the venting relief valve 7 is closed again in order to allow a pressure build-up in the pumping chamber 3 by means of the dosing pump 5.
  • a pre-pressure in the pumping chamber 3 is constructed prior to the dosing, which corresponds to about 90% of the pressure at the working fluid exiting the working fluid opening 4.
  • the pumping chamber 3 has a pressure sensor (not shown) in the working fluid region, which is connected to a control unit (also not shown).
  • the control unit controls the dosing pump 5 depending on the measuring signals of the pressure sensor such that before starting the actual dosing of the predetermined form in the
  • FIG. 2 shows a second exemplary embodiment of a device according to the invention, with reference to which a second exemplary embodiment of the method according to the invention is described.
  • the second embodiment of the device according to the invention and of the method according to the invention is fundamentally similar to the respective first exemplary embodiment.
  • the device according to Figure 2 also has the above-described components metering pump 5, pressure control valve 1 1, pumping fluid reservoir 9, valves 13 and 14 and the compressed gas source 10 for providing a form Q on.
  • a pumping chamber 3 'of the device comprises an elastic bladder 23 formed by an elastic membrane.
  • the elastic membrane is fixed on the inside to a wall of the pumping chamber 3 'fluid-tight and encloses an opening of the elastic bubble a pumping fluid opening 24 of the pumping chamber 3'.
  • the metering pump 5 is thus optionally pumping fluid via the pumping fluid port 24 into the elastic bladder 23 can be supplied or discharged from the elastic bladder.
  • the elastic bladder thus divides the pumping chamber 3 'into a pumping fluid area enclosed by the elastic bladder and a working fluid area outside the elastic bladder in the pumping chamber 3'.
  • the device according to FIG. 2 has a working fluid reservoir 16 which is designed to be pressure-stable and is fluid-conductively connected to the working fluid region of the pumping chamber 3 'via pressure-stable lines 18 and 18' via a shut-off valve 17. Furthermore, the pumping chamber 3 'on a vent valve 19, which is also fluidly connected to the working fluid region of the pumping chamber 3', wherein a vent line via the vent valve 19 opens into a collecting container 20.
  • the venting valve 19 is opened and pumping fluid is introduced into the elastic bladder 23 by means of the metering pump 5 so that the elastic bladder 23 expands and any gas present in the working fluid area of the pumping chamber 3 'is discharged via the vent line and the vent valve 19, then the vent valve 1 9 is closed and the shut-off valve 17 is opened so that when pumping fluid from the elastic bladder 23 by means of the metering pump 5, the elastic bladder 23 is reduced in volume and thus working fluid from the working fluid reservoir 16 flows into the working fluid region of the pumping chamber 3 '.
  • the shut-off valve 17 is closed. It is within the scope of the invention, when filling the working fluid region of the pumping chamber 3 'to close the working fluid discharge opening 22 of the pumping chamber 3' by means of a further valve. However, it is also possible to provide such a valve at the working fluid discharge opening 22 and instead to select the admission pressure by means of the compressed gas source 26 always during the filling process equal to the ambient pressure, so that at the working fluid discharge opening 22 neither an excess nor a negative pressure.
  • valves 17 and 19 are closed and it is in a step B by means of the metering pump 5 as previously described in Figure 1 pumping fluid 6 from the pumping fluid reservoir 9 into the pumping chamber 3', that is in the elastic bladder 23 introduced.
  • the elastic bladder 23 expands accordingly and displaces working fluid discharged from the working fluid opening 22.
  • Figure 3 shows a third embodiment of a device according to the invention, which is similar in basic construction to the first embodiment shown in FIG.
  • a third embodiment of a method according to the invention will be described, which thus also resembles the first embodiment of a method according to the invention in the basic sequence.
  • the device according to FIG. 3 has a volumetric translation device 30.
  • This comprises a first cylinder-piston unit 31 and a second cylinder-piston unit 32.
  • a first volume 31 a of the first unit 31 is fluid-conducting with a pump fluid inlet Opening a pumping chamber connected.
  • a first volume 32a of the second unit 32 is connected to a metering pump for conveying pumping fluid.
  • a bypass line for bypassing the units 31 and 32 is provided between the metering pump and the pumping chamber, which bypass line has a shut-off valve 28. Between the shut-off valve 28 and metering pump, a branch is provided in the flow path, which leads via a further shut-off valve 29 to the first volume 32 a of the unit 32.
  • pumping fluid For filling the pumping fluid region of the pumping chamber and for removing pumping fluid from the pumping chamber, by closing the valve 29 and opening the valve 28 as described above, pumping fluid can be fed into the pumping chamber or removed from the pumping chamber by means of the metering pump.
  • valve 28 is closed and the valve 29 is opened.
  • pumping of pumping fluid by means of the dosing pump into the pumping chamber thus takes place only indirectly.
  • FIG. 4 shows a fourth exemplary embodiment, which in principle is similar in construction to the second exemplary embodiments.
  • a volumetric translation unit 30 with a first unit 31 and a second unit 32 and a valve 28 and a bypass line and a valve 29 is additionally arranged. The operation follows analogously to the method described with reference to FIG. 2, the volumetric translation as described with respect to FIG. 3 being used to increase the dosing accuracy when the processing fluid is dispensed.
  • All embodiments have in common that due to the pressure-stable and dimensionally stable design of the pumping chamber (3, 3 ') and the connecting elements (8) to the metering pump (5) and due to the fact that pumping fluid (6, 6') and working fluid (3, 3 ') in the region between the metering pump (5) and the working fluid opening (4, 4') share the same volume, the volume flowing into the pumping chamber (3, 3 ') at all times at the working fluid openings (4, 4') outflowing volume corresponds.

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  • Health & Medical Sciences (AREA)
  • Clinical Laboratory Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Reciprocating Pumps (AREA)

Abstract

L'invention concerne un procédé pour doser un fluide de travail, le procédé comprenant les étapes suivantes: A. préparation du fluide de travail (1, 1') dans une chambre (3, 3') de pompe stable à la pression et de forme rigide; B. amenée d'un volume prédéfini d'un fluide de pompe (6, 6') incompressible au moyen d'une pompe de dosage (5) dans la chambre (3, 3') de pompe, dans laquelle (3, 3') sur une interface entre fluide de pompe (6, 6') et fluide de travail, laquelle interface subdivise la chambre de pompe (3, 3') en une région de fluide de pompe et une région de fluide de travail, I. une membrane flexible formant l'interface est disposée dans la chambre (3, 3') de pompe ou II. le fluide de pompe (6, 6') sur l'interface est directement adjacent au fluide de travail, et distribution du fluide de travail (1, 1') par au moins une ouverture (4, 4') pour fluide de travail de la chambre (3, 3') de pompe, par refoulement du fluide de travail (1, 1') dans la chambre (3, 3') de pompe par amenée du fluide de pompe (6, 6'). L'invention concerne également un dispositif pour doser un fluide de travail.
EP12769642.5A 2011-09-30 2012-10-01 Procédé et dispositif pour doser un fluide de travail Withdrawn EP2760584A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110114554 DE102011114554A1 (de) 2011-09-30 2011-09-30 Verfahren und Vorrichtung zum Dosiereneines inkompressiblen Arbeitsfluids
PCT/EP2012/069389 WO2013045711A1 (fr) 2011-09-30 2012-10-01 Procédé et dispositif pour doser un fluide de travail

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EP2760584A1 true EP2760584A1 (fr) 2014-08-06

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EP (1) EP2760584A1 (fr)
DE (1) DE102011114554A1 (fr)
WO (1) WO2013045711A1 (fr)

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DE102015016603A1 (de) 2015-12-22 2017-06-22 Eppendorf Ag Pipettiervorrichtung und Verfahren zu ihrer Herstellung
DE102017114895A1 (de) * 2017-07-04 2019-01-10 Fresenius Medical Care Deutschland Gmbh Pumpsystem, Dialysegerät und Verfahren zum Betrieb eines Pumpsystems
WO2023057566A1 (fr) 2021-10-06 2023-04-13 Shape Engineering GmbH Procédé, récipient et agencement pour distribuer une substance fluide
DE102021125886A1 (de) 2021-10-06 2023-04-06 Shape Engineering GmbH Verfahren, Behälter und Anordnung zum Ausbringen einer fließfähigen Substanz
DE102021133514A1 (de) 2021-12-16 2023-06-22 J. Wagner Gmbh Membranpumpvorrichtung

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WO2013045711A1 (fr) 2013-04-04

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