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WO2016066411A1 - Élément de coalescence et élément filtrant présentant un élément de coalescence - Google Patents

Élément de coalescence et élément filtrant présentant un élément de coalescence Download PDF

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Publication number
WO2016066411A1
WO2016066411A1 PCT/EP2015/073520 EP2015073520W WO2016066411A1 WO 2016066411 A1 WO2016066411 A1 WO 2016066411A1 EP 2015073520 W EP2015073520 W EP 2015073520W WO 2016066411 A1 WO2016066411 A1 WO 2016066411A1
Authority
WO
WIPO (PCT)
Prior art keywords
coalescence
filter
fluid
medium
coalescing
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/EP2015/073520
Other languages
German (de)
English (en)
Inventor
Richard Bernewitz
Gerd Behling
Sergio Gandini
Martin Veit
Idriss Razgani
Daniel Volkmer
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.)
Mann and Hummel GmbH
Original Assignee
Mann and Hummel 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 Mann and Hummel GmbH filed Critical Mann and Hummel GmbH
Priority to DE112015004944.4T priority Critical patent/DE112015004944A5/de
Publication of WO2016066411A1 publication Critical patent/WO2016066411A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B01D36/003—Filters in combination with devices for the removal of liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
    • B01D29/58—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection arranged concentrically or coaxially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/04—Supports for the filtering elements
    • B01D2201/0415—Details of supporting structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/29—Filter cartridge constructions
    • B01D2201/291—End caps
    • B01D2201/295—End caps with projections extending in a radial outward direction, e.g. for use as a guide, spacing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/34—Seals or gaskets for filtering elements
    • B01D2201/347—Radial sealings

Definitions

  • the invention relates to a coalescing element, as well as a filter element with a coalesced zenzelement for separating a disperse phase from a continuous phase of a fluid and a filter system with a filter element, in particular for the separation of water from fuel in a fuel filter of a motor vehicle.
  • a filter element for filtering a fluid e.g. Fuel, known, which is suitable for removing contaminants such as water from fuel.
  • the filter element is realized in a kind of sandwich construction.
  • a multi-layer coalescing medium is embedded between the filter medium and a support tube, wherein the coalescing medium consists of one or more formlabile materials, which is embedded in a dimensionally stable manner between the filter medium and the support tube and connected at one end face tightly with the end body.
  • formlabile materials coalescing media can be realized which are optimized with regard to their coalescence efficiency and / or their ability to flow through.
  • Form-flexible materials can be easily adapted to different installation spaces, even during final assembly.
  • dimensionally unstable means that the own dimensional stability and / or inherent rigidity of the coalescent medium is insufficient to ensure that the coalescing medium, when solely bonding, ie without the aid of the described sandwich construction, with the end body, in particular by pressing into a corresponding soft, later hardening bonding medium, for example adhesive or molten surface material of the end body, bends or kinked, whereby the stability and / or the tightness of the connection can be impaired.
  • the support tube and the filter medium ensure the dimensional stability of the entire composite.
  • the layers of the coalescing medium may consist of a single or of different materials.
  • the coalescing medium and the filter medium may be made of different materials.
  • a multilayer coalescing element in which, viewed in the flow direction, a plurality of layers with coalescing medium are arranged on one are arranged composed of fibers meltblown layer. Disclosure of the invention
  • An object of the invention is to form a coalescence element for depositing a disperse phase from a continuous phase of a fluid such that the coalescing element is compact and simple, thereby further improving the separation of the disperse phase from the continuous phase of the fluid.
  • Further objects of the invention are to provide a filter element with a coalescence element for separating a disperse phase from a fluid and a filter system for accommodating such a replaceable filter element with a coalescing element, which is compact and simple in construction and wherein the deposition of the disperse phase from the continuous phase of the fluid is further improved.
  • a coalescing element of a separating device of a disperse phase from a continuous phase of a fluid, in particular of water from fuel in a fuel filter characterized in that the coalescence at least one coalescence, which coalescence of in The fluid contained contained disperse phase is provided, and at least one hydrodynamic focusing element comprises, which is provided for the flow optimization of the fluid flow and is arranged in the flow direction in front of the coalescer.
  • a coalescing element of a disperse phase separation device comprising a continuous phase of a fluid, in particular of water from fuel in a fuel filter, which comprises at least one coalescing medium which is provided for coalescing the disperse phase contained in the fluid, wherein a fluid path for the fluid is arranged between an inlet side and an outlet side through the coalescing medium.
  • the Coales- Zenzelement at least one hydrodynamic focusing element, which is provided for the flow optimization of the fluid flow and is arranged in the flow direction in front of the coalescer.
  • the focussing element for the fluid flow has first regions and second regions which have different permeabilities to the fluid flow, the permeability of the second regions being at most half as great as that of the first regions.
  • the permeability of the second regions may be zero when the second regions comprise the material, such as metal, plastic, of which the focusing element is constructed.
  • the first regions may in particular comprise apertures in the material, such as holes, slots or similar structures.
  • the focusing element may be constructed of a fabric, in which case the first regions are the open apertures in the fabric, and the second regions are the impermeable structure of the fabric.
  • the coalescing element is designed to coalesce the majority of the disperse phase in the fluid, ie the droplet size of the disperse phase, which in the case of a water / diesel fuel mixture according to DIN ISO 1 6332 (as of 2009) is of the order of magnitude between 10 ⁇ m and 150 ⁇ is to increase, and to separate the thus coalesced water from the fuel.
  • the water which is heavier than fuel, can settle to the bottom and drain through suitable passages. Also, the water drops can be crushed in subsequent pumps.
  • coalescing medium it is possible to use customary media, for example nonwovens or cellulosic media, which can be designed in wound or pleated form.
  • the coalescence element according to the invention has measures for the optimization of coalescence-based liquid-liquid filters, which are based on the multistage principle of droplet coalescence (increase in droplet size due to coalescence) and the subsequent droplet deposition due to differences in density.
  • the main coalescing stage for enlarging the droplets consists of one or more coalescing media layers, which in pleated or wound form represent a coalescing bellows. Usually, coalescing media layers are flowed through without any further upstream or downstream measures for optimization.
  • the coalescence performance is based on collision processes of droplets, which are delayed by the coalescent medium.
  • the term “graping” generally refers to agglomeration, including the agglomeration of drops-in-drops, that is to say fluid which is enveloped by a shell of the disperse phase, which leads to a drastic deterioration of the separation efficiency.
  • the focusing element which comprises the coalescing element, generates a hydrodynamic focusing.
  • the coalescing element is the merging of the disperse phase by reducing the inflow surface and thereby also an improved deposition with a small proportion of the disperse phase in the fluid.
  • the focusing element may be in flexible or rigid form and / or porous. In the simplest case, it is a film whose porosity is ensured by holes. The number, size and shape of the holes is variable. Thus, for example, a distance between the holes of 5 - 7 mm with a hole diameter of about 5 mm be favorable.
  • the thickness of the film or sheet may be, for example, 0.3 mm.
  • the region of lesser permeability may be between 20% and 90% of the total inflow area of the focussing element.
  • the free surface achieves hydrodynamic focusing, which increases the coalescing power as a function of the overall system.
  • the second regions with lower permeability a spatial separation between a particle and the coalescing medium is achieved, which also contributes to performance improvement.
  • the focusing element may be a separate from Koaleszenzmedium element. This allows a free design of the focusing element regardless of the coalescing material.
  • the focusing element can rest force-free on the coalescing medium.
  • a support of the coalescence medium is achieved, which may be formed, for example, as a fleece or sponge-like and thus has a certain form stability. If the focusing element is made rigid, for example with a foil or a metal sheet, then the coalescence medium can be supported without it lying against a filter bellows or a housing. The coalescing medium is thus protected against compression by a particle filter medium. As a result, the coalescence of the disperse phase to be deposited can be favorably improved.
  • the first regions of the focusing element may comprise between 20% and 90%, preferably between 30% and 80%, of a total inflow surface through the fluid.
  • first and second regions with different permeability to the fluid and the phase dispersed therein, particularly favorable values of velocity gradients can be achieved in hydrodynamic focusing, so that the coagulation reading performance can be further improved.
  • the first regions can be distributed over the total inflow surface.
  • the first regions can be distributed homogeneously over the total inflow surface.
  • the focusing element may be configured so that at least 90% of the fluid flow, in particular at least 95% of the fluid flow, flow through the first regions of the focusing element.
  • the different flow resistance between the first regions and the second regions can be utilized. The flow resistance of the first regions is favorably lower than the flow resistance of the second regions.
  • the first regions of the focusing element may have openings with several tens of millimeters of cross-sectional area, in particular the cross-sectional area may be between 75 mm 2 and 70 mm 2 .
  • the openings may preferably be formed as through the focusing element through openings.
  • the large openings provide an advantageous focusing effect.
  • the second regions of the focusing element may be impermeable. This advantageously enhances the focusing effect.
  • the focusing element may be formed from a sheet metal, in particular from a perforated plate.
  • the sheet may for example be galvanized to be protected from corrosion.
  • the number, size and shape of the holes is variable.
  • the design as a metal sheet is particularly favorable, since such a filter bellows and / or the coalescing medium, which are possibly designed to be dimensionally stable, can be supported against the flow pressure.
  • Other geometries for designing the hydrodynamic focusing element are also conceivable, such as lattice, fabric, slots, which can lead to a partial covering or blocking of the total inflow surface.
  • the focusing element may be formed from a plastic film, in particular from a polyamide (PA) film or a polyethylene (PE) film.
  • the polyamide film can be laser-sintered, for example.
  • a design as a laminated and / or stamped film may be favorable, since the focusing element can be manufactured as cost-effective and flexible in various forms and with a varying distribution of first and second regions with different permeability. This also makes it possible to save weight of the coalescing element.
  • the focusing element can be made of cellulose.
  • the cellulose medium may additionally be advantageously impregnated with a binder in order to achieve an impregnating effect. Even so, a cost-effective and very flexible design of the focusing element is possible.
  • the coalescing medium can be arranged according to the intended direction in the flow direction after a particle filter medium. As a result, since the fluid first flows through the particulate filter medium and only then through the coalescence medium, the particulate filter medium can filter out any dirt particles from the fluid, thereby reducing the risk of the coalescing medium being added by these dirt particles.
  • a spatial distance between the coalescer and the particulate filter medium may be provided. Since on or in a first filter stage, when the coalescing element is used as intended in a filter element, such as a particulate filter medium, a preloading usually takes place, a spatial separation between particle filter and coalescing medium is favorable for the coalescence in the main coalescence media layer. As a result of the spatial separation, droplets can form until reaching the separation condition caused by the flow (due to a so-called Rayleigh plateau instability). In comparison, the contact between the particle filter and the coalescing medium leads to a structural change and thus to locally high flow velocities and to deflections of the flow direction which predominantly prevent the formation of large droplets. This is achieved by the invention prevents the reading element. By specifically influencing the flow conditions and the spatial separation in multistage coalescence concepts by special geometries, the performance of coalescence-based liquid-liquid filter is thus further improved.
  • the focusing element can be integrated in a support tube.
  • the geometry of the focusing element for example in the form of a perforated plate, can be integrated in a so-called center tube as a support tube of a filter element.
  • the support tube is made as usual as a plastic injection-molded part and the focusing element is injected with.
  • a support tube usually has large recesses between stable support areas.
  • the focusing element can cover usual recesses of the central tube.
  • the coalescing medium for separating droplets of the disperse phase can, as intended, interact with an end separator arranged on its outlet side, which is formed from a hydrophobic material.
  • a hydrophobic material has the advantage that the disperse phase is particularly easy to drain on the surface and is thus retained.
  • the end separator can be screen-like as a separation medium.
  • a sieve-like, in particular woven separation medium has the advantage that the droplets of the disperse phase are held on the screen fibers and in particular drip down, or, depending on the density difference of disperse and continuous phase, can rise to the top.
  • the disperse phase can be optimally retained on a sieve-like separation medium.
  • the mesh openings of a sieve-like fabric can be defined in a simple and defined manner. It can be optimally permeable to the fuel. With a sieve-like structure, it is easy to minimize the pressure loss on the separation medium.
  • a sedimentation gap can be provided between the coalescing medium and the final separator.
  • the end separator can limit the sedimentation gap on the side opposite the coalescing medium.
  • the drops combined with the coalescing medium The disperse phase can be precipitated in the flow path of the fluid behind the coalescing medium in the sedimentation gap. They can fall down or rise up depending on the specific weight of the fluid. In the coalescing medium, the droplets of the disperse phase are enlarged during the passage through the coalescing element.
  • droplets are collected under gravity in a collecting space of a filter system, from where the coalesced, formerly disperse phase can be drained off, for example via a screw during service.
  • the coalescing medium can be designed as a hollow body, in particular as a hollow cylinder.
  • a hollow body in particular as a hollow cylinder.
  • Round filter shapes are very widespread, especially in the liquid filter area, since they can be used favorably in terms of flow and space.
  • the invention relates to a filter element for filtering a fluid, having a fluid path between a raw side and a clean side, having at least one coalescence element according to the invention as described above.
  • the filter element for filtering a fluid having a fluid path between a raw side and a clean side may comprise at least one filter bellows, which is preferably formed from a particulate filter medium, and a support tube arranged inside the filter bellows.
  • the filter element can comprise at least one end separator arranged in the flow direction downstream of the filter bellows, which has passages for the passage of the fluid, and at least one coalescing element, which comprises at least one coalescing medium, and at least one focusing element in the flow direction in front of the coalescence medium.
  • the coalescence element is arranged in the flow direction between the filter bellows and the final separator and provided for coalescence of the disperse phase contained in the fluid.
  • a spatial distance can be provided between the filter bellows and the coalescing element, and a sedimentation gap can be provided between the coalescing element and the final separator.
  • the focusing element may rest against the filter bellows, in particular bear force-free.
  • the focussing element can support the filter bellows against the flow pressure of the fluid to be filtered and prevent the filter bellows from contacting the coalescing medium.
  • the free space between the filter bellows and the coalescent medium further improves coalescence performance.
  • the focusing element may be integrated in the support tube;
  • the geometry of the focusing element for example in the form of a perforated plate, be integrated into a so-called center tube as a support tube. This is particularly conceivable when the support tube is made as usual as a plastic injection molded part.
  • the filter bellows and / or the coalescing element can be hollow-cylindrical, with the fluid path leading radially through the filter bellows and the coalescing element, in particular leading from an outside area into an interior area of the hollow cylindrical shape.
  • a hollow cylindrical shape is favorable in order to use the filter element in a round filter system, as used in automotive vehicles. range, especially in commercial vehicles, are frequently used.
  • the first fluid path can lead radially from an outer region into an inner region into the filter element. This arrangement allows an inflow, for example, of fuel from the outside over the circumference of the filter element by the example star-folded Filterme- dium of the filter body. The fuel can then flow through the filter element to the inside and be discharged via the inner region of the filter element in the fuel supply of an internal combustion engine.
  • the filter bellows, the coalescing element, and the end separator can be arranged coaxially within the filter element, and the coalescing medium and the focusing element can be arranged coaxially within the coalescing element.
  • This coaxial arrangement is favorable in terms of space in an embodiment of the filter element as a hollow cylinder.
  • the invention relates to a filter system having a filter element which is exchangeably arranged in a filter housing for filtering a fluid, wherein the filter element has at least one hollow cylindrical filter bellows. At least one end separator is arranged inside the filter bellows. Furthermore, a coalescing element is arranged in the flow direction between the filter bellows and the final separator.
  • the coalescing element comprises at least one coalescing medium, as well as at least one focusing element in the flow direction in front of the coalescence medium, the coalescing element being arranged in the flow direction between the filter bellows and the final separator.
  • the filter system for filtering a fluid can be equipped with a filter element arranged exchangeably in a filter housing, the filter element providing on its clean side a coalescing element for coalescing a disperse phase contained in the fluid.
  • the filter system may be equipped with a filter element, wherein the filter element has a hohizylinderförmigen filter bellows with an arranged inside the filter bellows end.
  • a coalescing element in the flow direction between the filter bellows and the end be arranged separator, and the coalescing at least one coalescence medium, and at least one focusing element in the flow direction in front of the coalesced medium, wherein the coalescer can be arranged in the flow direction between the filter bellows and the Endabscheider.
  • the filter system for filtering fuel, in particular diesel fuel, in particular an internal combustion engine, and in particular a motor vehicle.
  • fuel in particular diesel fuel
  • an internal combustion engine in particular a motor vehicle.
  • the use of such a configuration for other liquid fluids that need to be filtered and contain a dispersed phase is conceivable.
  • filter systems for other liquid fluids will usually provide coalescence elements, so that the use of the proposed coalescence element is also conceivable when filtering other fluids.
  • FIG. 1 shows a longitudinal section through a filter element according to an embodiment of the invention with a single-layer coalescing element and a Endabscheider for fuel filtration in a motor vehicle.
  • 2 shows a longitudinal section through a filter element according to a further exemplary embodiment of the invention with a single-layer coalescing element and an end separator for fuel filtration in a motor vehicle;
  • 3 shows a partial section through the filter element according to Fig. 2.
  • FIG. 4 shows a longitudinal section through a filter system according to an embodiment of the invention with a filter element with a single-layer coalescing element and an end separator;
  • FIG. 5 is a schematic diagram of a focusing element according to an embodiment of the invention to illustrate the operation of the hydrodynamic focusing.
  • FIG. 6 shows a schematic diagram of a focusing element according to an exemplary embodiment of the invention for clarifying the mode of action of the detachment of a droplet of a disperse phase due to a plateau Rayleigh instability, driven by the capillary force of the droplet of the disperse phase.
  • the invention is illustrated with reference to a fuel filter for filtering fuel, in particular diesel fuel, but may also be provided for other filter systems with appropriate adaptation of the construction.
  • the filter element 10 for filtering a fluid with a fluid path 40 between a raw side 52 and a clean side 50 comprises a filter bellows 12, which is preferably formed of a particulate filter medium 14, an arranged downstream of the filter 12 in the flow direction 41 Endabscheider 106 having passages 20 for flowing through the fluid, and a coalescing element 30 as a disperse phase separation device from a continuous phase of Fluids, such as water from a fuel, eg diesel fuel.
  • the coalescing element 30, which is provided for coalescing the disperse phase contained in the fluid, comprises a coalescing medium 32 and a focusing element 34 in the flow direction 41 in front of the coalescence medium 32, the coalescing element 30 being arranged in the flow direction 41 between the filter bellows 12 and the end separator 106 and is provided for coalescing the disperse phase contained in the fluid. Between the filter bellows 12 and the coalescing element 30, a spatial distance 1 6 is provided. Between the coalescing element 30 and the end separator 106, a sedimentation gap 18 is further provided.
  • the focusing element 34 which is provided for the flow optimization of the fluid flow and in the flow direction 41 before the coalescent.
  • the permeability of the second portions 38 is at most half as large as that of the first portions 36.
  • the permeability The second regions 38 should be zero when the second regions 38 comprise the material such as metal, plastic, from which the focusing element 34 is constructed.
  • the first regions 36 may in particular comprise apertures in the material such as holes, slots or similar structures.
  • the focusing element 34 may be constructed of a fabric, in which case the first regions 36 are the open apertures in the fabric, and the second regions 38 are the impermeable structure of the fabric.
  • the focusing element 34 is applied as a thin sheet or thin film to the coalescence medium 32 without force.
  • the focusing element 34 could also rest on the filter bellows 12, in particular bear force-free.
  • Another possibility is that the focusing element 34 of coalescing medium 32 and filter bellows 12 is arranged at a distance.
  • a support tube 22 is arranged between the filter bellows 12 and the coalescent medium 32.
  • a gap 16 is formed between the support tube 22 and the focusing element 34, which is attached to the outside of the coalescence medium 32, which contributes favorable flow dynamics to the effect of the focusing element 34.
  • the focusing element 34 it is also conceivable for the focusing element 34 to be integrated in the support tube 22.
  • the focusing element 34 is also conceivable for the focusing element 34 to be integrated in the support tube 22.
  • the geometry of the focusing element 34 in the form of a perforated plate or as a slotted plate could also be formed directly in the plastic material of the support tube 22.
  • the coalescing medium 32 is arranged downstream of the particle filter medium 14 in the flow direction 41.
  • the coalescing medium 32 for separating drops of the disperse Phase cooperates with the arranged on its outlet side 51 Endabscheider 106, which is formed of a hydrophobic material.
  • the focusing element 34 can be formed, for example, from a metal sheet, in particular from a perforated metal sheet, from a plastic film, for example a PA or PE film, or from cellulose.
  • the focusing element 34 may advantageously have a first area 36 between 20% and 90% of a total inflow area through the fluid.
  • embodiments of the focusing element 34 in the form of a grid, a fabric, or slits are conceivable.
  • the filter element 10 is designed in a hollow cylinder shape.
  • the filter bellows 12 and the coalescing element 30 have a hollow cylindrical shape, the fluid path 40 leading radially through the filter bellows 12 and the coalescing element 30, in particular leading from an outer region 42 into an inner region 44 of the hollow cylindrical shape.
  • the filter bowl 12, the coalescing element 30, and the end separator 106 are coaxially disposed within the filter element, and the coalescing medium 32 and the focusing element 34 are coaxially disposed within the coalescing element 30.
  • FIG. 2 shows a longitudinal section through a filter element 10 according to a further exemplary embodiment of the invention with a single-layer coalescing element 30 and an end separator 106 for fuel filtration in a motor vehicle.
  • the arrangement of the individual components is similar to the filter element 10 shown in Figure 1.
  • the coalescing medium 32 with the attached to the outside focusing element 34 which is formed in this embodiment as a thin perforated plate, on the inside of the filter bellows 12 , which is also flowed through in the flow direction 41 from the outside with the fluid along the flow path 40 in this embodiment. Since in this case no support tube 22, as shown in FIG.
  • FIG. 3 shows a partial section through the filter element 10 according to FIG. 2.
  • the outer hollow cylinder of the filter bellows 12 is shown, which is flowed through from the outside with the fluid along the flow path 40 in the flow direction 41.
  • the focusing element 34 is formed as a thin perforated plate. In the flow direction 41, the coalescing medium 32 is then flowed through, which immediately follows the focusing element 34.
  • the disperse phase in the exemplary embodiment water separated from fuel, drops down as a drop due to gravity and, due to the hydrophobic effect of the downstream end separator 106, sinks down and collects.
  • Focusing element 34, coalescing medium 32, Endabscheider 106 are formed in a hollow cylinder.
  • FIG. 4 shows a longitudinal section through a filter system 100 according to an exemplary embodiment of the invention with a filter element 10 with a single-layer coalescing element 30 and an end separator 106.
  • the filter system 100 has a filter element 10 arranged in a filter housing 108 for filtering a fluid, the filter element 10 providing on its clean side 50 a coalescing element 30 for coalescing a disperse phase contained in the fluid.
  • the filter element 10 is used as a round filter element in a round filter housing 108, which consists of an upper housing part 1 12 and a lower housing part 1 14, is used.
  • the filter element 10 is seated centrally in the housing 108 and is braced with two end plates 15, 17 in the filter housing 108.
  • an end separator 106 is arranged on a clean side 50, which covers the entire fluid path 40, since the end separator 106 protrudes beyond the filter element 10 at both end faces and is fluid-tightly connected to the upper housing part 12 and the lower housing part 14.
  • Fluid is supplied into the filter housing 108 from the outside via an inlet, not shown, which penetrates the filter element 10 from a radial outer side and can pass via the filter bellows 12, the coalescing element 30 and the end separator 106 into an interior region of the filter housing 108. Through this inner region, the filtered fluid is discharged again via an outlet 104. guided.
  • the filter system 100 can be screwed with this outlet 104 via a screw thread 1 10 on a connecting piece.
  • the filter system comprises a filter element 10, which has a hollow-cylindrical filter bellows 12 with an end separator 106 arranged inside the filter bellows 12, the coalescing element 30 being arranged in the flow direction between the filter bellows 12 and the end separator 106.
  • the coalescing element 30 comprises a coalescing medium 32 and a focusing element 34 in the flow direction in front of the coalescence medium 32, the coalescing element 30 being arranged in the flow direction between the filter bellows 12 and the end separator 106.
  • the disperse phase in the fluid is for the most part passed through the filter bellows 12.
  • the droplets of the disperse phase are increased during the passage through the coalescing element 30.
  • the drops are gravity-assisted collected in a collecting space 60 of the filter system, from where the coalesced, formerly disperse phase can be discharged, for example via a screw during service to the outside. Smaller drops, which were not separated by gravity at first, are prevented from penetrating the clean side 50 on the hydrophobic surface of the end separator 106 and are then likewise deposited in the collecting space.
  • the filter system 100 is preferably used for filtering fuel, in particular diesel fuel, in particular an internal combustion engine, and in particular a motor vehicle.
  • FIG. 5 shows a schematic diagram of a focusing element 34 according to an embodiment of the invention to illustrate the operation of the hydrodynamic see focusing.
  • the inflowing fluid in the flow direction 41 impinges on the focusing element 34, which has a first region 36, which is permeable to the fluid, and a second region 38, which is not permeable to the fluid.
  • the focusing element 34 can be represented by a perforated plate. the.
  • the first region 36 is then formed by holes in the sheet, the second region 38 is then the area between the holes, so the non-perforated plate itself.
  • the fluid flows to the perforated plate at a flow velocity v 0 and can only flow through the holes.
  • a velocity distribution of the fluid flow forms as in the enlarged view of the perforated plate in Figure 4 schematically indicated.
  • the velocity vi of the part of the fluid flow which passes centrally through a hole is substantially greater than the velocity v n of the fluid flow in the edge region of the hole.
  • An increased velocity gradient 84 of the fluid flow forms, which can lead to a doubling of the velocity ⁇ of the fluid flow in the central region in relation to the velocity v 0 of the inflowing fluid.
  • FIG. 6 shows a further schematic diagram of a focusing element 34 according to an exemplary embodiment of the invention for clarifying the mode of action of the detachment of a droplet 82 of the disperse phase due to the so-called plateau Rayleigh instability, driven by the capillary force of the drop 82. Due to the increased velocity gradient of the fluid flow in the The central region of the hole in the metal sheet forms more favorable removal conditions for the droplet 82 of the disperse phase, which is thus easier to detach from the fluid droplet 80 and thus can be deposited favorably in a coalescing medium 32.

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  • Chemical Kinetics & Catalysis (AREA)
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Abstract

L'invention concerne un élément de coalescence (30) d'un dispositif de séparation d'une phase dispersée d'une phase continue d'un fluide, en particulier de l'eau d'un carburant dans un filtre à carburant, qui comprend au moins un moyen de coalescence (32), qui est destiné à la coalescence de la phase dispersée contenue dans le fluide, une voie fluidique (40) pour le fluide étant disposée entre un côté entrée (53) et un côté sortie (51) au travers du moyen de coalescence (32). En outre, l'élément de coalescence (30) présente au moins un élément de focalisation (34) hydrodynamique, qui est destiné à l'optimisation de l'écoulement du flux fluidique et qui est disposé, dans le sens d'écoulement (41), en amont du moyen de coalescence (32). L'élément de focalisation (34) présente des premières zones (36) et des deuxièmes zones (38) pour le flux fluidique, qui présentent des perméabilités différentes pour le flux fluidique, la perméabilité des deuxièmes zones (38) représentant au plus la moitié de celle des premières zones (36). L'invention concerne en outre un élément filtrant (10) présentant un tel élément de coalescence (30), un système de filtre (100) équipé d'un tel élément filtrant (10) ainsi que l'utilisation de l'élément filtrant pour filtrer un carburant, en particulier un carburant diesel.
PCT/EP2015/073520 2014-10-30 2015-10-12 Élément de coalescence et élément filtrant présentant un élément de coalescence Ceased WO2016066411A1 (fr)

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DE112015004944.4T DE112015004944A5 (de) 2014-10-30 2015-10-12 Koaleszenzelement und Filterelement mit einem Koaleszenzelement

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DE102014015942.6A DE102014015942A1 (de) 2014-10-30 2014-10-30 Koaleszenzelement und Filterelement mit einem Koaleszenzelement
DE102014015942.6 2014-10-30

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Publication number Priority date Publication date Assignee Title
DE102016103561A1 (de) * 2016-02-29 2017-08-31 Hengst Se & Co. Kg Filtermaterial für einen Filtereinsatz eines Kraftstofffilters, Filtereinsatz und Kraftstofffilter
BR112021017848A2 (pt) 2019-03-12 2021-11-30 Parker Hannifin Corp Elemento de filtro, método para remover água emulsificada a partir de um fluxo de combustível e método para formar um elemento de filtro

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4253954A (en) * 1979-07-02 1981-03-03 Nelson Industries, Inc. Two-stage spin-on separating device
WO2001072396A1 (fr) * 2000-03-24 2001-10-04 Sogefi Filtration S.P.A Filtre pour carburant de moteur diesel
WO2011126136A1 (fr) * 2010-04-09 2011-10-13 ヤマシンフィルタ株式会社 Élément filtrant et dispositif de filtration

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011120647A1 (de) * 2011-12-09 2013-06-13 Mann + Hummel Gmbh Kraftstofffilter einer Brennkraftmaschine und Filterelement eines Kraftstofffilters
DE102011120638A1 (de) 2011-12-09 2013-06-13 Mann + Hummel Gmbh Filterelement eines Kraftstoffilters und Verfahren zur Herstellung eines solchen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4253954A (en) * 1979-07-02 1981-03-03 Nelson Industries, Inc. Two-stage spin-on separating device
WO2001072396A1 (fr) * 2000-03-24 2001-10-04 Sogefi Filtration S.P.A Filtre pour carburant de moteur diesel
WO2011126136A1 (fr) * 2010-04-09 2011-10-13 ヤマシンフィルタ株式会社 Élément filtrant et dispositif de filtration

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