EP2466112B1 - Amortisseur de pulsations - Google Patents

Amortisseur de pulsations Download PDF

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Publication number
EP2466112B1
EP2466112B1 EP20110009811 EP11009811A EP2466112B1 EP 2466112 B1 EP2466112 B1 EP 2466112B1 EP 20110009811 EP20110009811 EP 20110009811 EP 11009811 A EP11009811 A EP 11009811A EP 2466112 B1 EP2466112 B1 EP 2466112B1
Authority
EP
European Patent Office
Prior art keywords
damping
snubber
cross
essentially
flow
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.)
Not-in-force
Application number
EP20110009811
Other languages
German (de)
English (en)
Other versions
EP2466112A2 (fr
EP2466112A3 (fr
Inventor
Stephan Wanner
Arthur Handtmann
Sebastian Franz
Stefan Schneider
Franz Prof. Dr. Dr. h.c. Durst
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.)
KW Technologie GmbH and Co KG
Original Assignee
KW Technologie GmbH and Co KG
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 KW Technologie GmbH and Co KG filed Critical KW Technologie GmbH and Co KG
Publication of EP2466112A2 publication Critical patent/EP2466112A2/fr
Publication of EP2466112A3 publication Critical patent/EP2466112A3/fr
Application granted granted Critical
Publication of EP2466112B1 publication Critical patent/EP2466112B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/27—Fuel-injection apparatus with filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations

Definitions

  • the invention relates to a device for injecting a pressurized fuel fluid into a combustion chamber with a pressure generator, at least one injector with injection opening and a fuel line between the pressure generator and the injector according to the preamble of claim 1.
  • Such devices are used, for example, in internal combustion engines in which clocked under high pressure fuel and metered into the combustion chamber of individual cylinders is injected. Particularly in this application, very short switching times of the injectors and an accurate volume metering of the fuel are advantageous.
  • Damping elements or filters which are formed, inter alia, as a sintered material, metal strips, fibers, tube bundles or fabric.
  • Object of the present invention is therefore to provide a device according to the preamble of claim 1 with an improved damping.
  • a device is characterized in that a length of the damping element oriented in the flow direction of the fuel fluid is substantially between 1 and 100 millimeters.
  • a significantly improved compared to the prior art damping is achieved in that a ratio of a cross-sectional diameter of the cross-sectional area and / or a pore diameter of the pores to aligned in the direction of flow of the fuel fluid length of the damping element is substantially between 2 and 5 microns per millimeter.
  • the aligned in the flow direction of the fuel fluid length of the damping element is substantially between 2 and 50 millimeters in size.
  • the latter requirement is primarily for vehicle applications, especially for automotive applications of high relevance.
  • the construction volume of the device or damping unit or injector according to the invention is to be realized as small as possible.
  • comparatively small dampers can be realized with fairly good damping, so that they can be accommodated in modern vehicles with little space available.
  • a cross-sectional diameter of the cross-sectional area and / or a pore diameter of the pores is substantially between 5 and 200 microns in size, preferably substantially between 10 and 100 microns in size.
  • a cross-sectional diameter of the cross-sectional area and / or the pore diameter of the pores is substantially 10 micrometers and the length of the damping element aligned in the flow direction of the fuel fluid is substantially 2 millimeters.
  • a cross-sectional diameter of the cross-sectional area and / or a pore diameter of the pores is substantially 100 micrometers and the length of the damping element aligned in the flow direction of the fuel fluid is substantially 50 millimeters.
  • the fuel flow through the Damping element can be subdivided into a plurality of partial flows, wherein the partial flows are at least partially reunited in the flow direction behind the damping element.
  • an increased energy dissipation is realized in the damping element, which can be based on different effects.
  • friction and throttle effects play a role.
  • the contact area and the contact time of the fuel fluid with the wall regions of the damping element and thus also the friction are significantly increased by the inventive division of the total flow of the fuel fluid.
  • Due to the increased energy dissipation can be a pulsation, which is caused for example by the switching of an injector, effectively dampen.
  • improved metering of the fuel is possible both in terms of timing and in terms of the amount to be metered.
  • At least two such damping elements are provided, with a flow zone in between, in which the partial flows are at least partially united.
  • the damping effect can be positively influenced.
  • the partial flows are completely reunited behind one and / or between two damping elements.
  • the partial flows are formed completely separated from each other within the damping element.
  • damping element In principle, however, the use of a damping element would be possible in which the partial flows within the damping element are at least partially in communication with each other. By the interaction of the partial flows with each other, the damping element can then be designed in its entirety with regard to the damping effect to be achieved, since the interaction of the partial flows is difficult to detect with respect to their damping effect.
  • the partial flows according to the invention are formed by tubular flow channels.
  • Such tubular flow channels offer by defined boundary conditions such as cross-section, flow length, wall friction, etc. the ability to design the desired damping of a partial flow defined.
  • a plurality of tubular flow channels can also be formed structurally easier.
  • a damping element may include a bundle of elongated elements formed as a hollow body.
  • Such hollow bodies can, for example, by capillaries of different materials, For example, glass capillaries or hollow fibers, but also be formed by small metal tubes or the like.
  • a damping effect can be achieved in particular by wall friction.
  • a bunch of solid bodies such as rods, in particular round rods made of different materials.
  • the outer contour of such rods need not necessarily be round, they can also be otherwise, for example, polygonal design.
  • a defined channel for a partial flow can also be generated by such a measure.
  • phases or beads in individual bodies with a surface-covering cross-section for example, triangular, quadrangular, hexagonal, etc., or even rounded edges of such bodies when forming a bundle can yield defined flow channels in the longitudinal direction.
  • a wound, in particular not flat or corrugated and / or beads and troughs or phases or the like having band element can be provided.
  • This can be arranged as a cylindrical damping element in corresponding lines or pipes.
  • this may be formed in the unwound form in the manner of corrugated cardboard.
  • a damping element is realized by a body with longitudinal bores, which form flow channels for partial flows.
  • an attenuation effect results from the partial flows according to the invention if the cross-sectional diameter of the cross-sectional area and / or a pore diameter of the pores or the average cross section of the partial flows is less than 200 ⁇ m, for example 80 ⁇ m, preferably less than 40 ⁇ m. It has been found that particularly with such small flow cross-sections, which are in the region of capillaries, a particularly good pulsation damping is possible.
  • the damping in particular in the frequency range of the natural frequencies caused thereby, can be further improved.
  • an arrangement of a damping element according to the invention in the vicinity of an injector or even in the injector makes sense, in order to introduce the damping effect in the immediate vicinity of the place of origin of the pulsation.
  • it is advantageous to construct the damping element at an upstream position with respect to the flow direction of the fuel fluid since in the area of the injectors there is often an extreme lack of space, difficult accessibility and / or other unfavorable conditions.
  • one or more damping elements can be arranged in an unbranched region of the fuel line behind the pressure generator to be ordered.
  • This arrangement has the advantage that, with the same damping elements, the pressure pulsations caused by all the injectors can be damped according to the invention.
  • the fuel line in this area is generally more accessible and usually has a larger cross section in this area. Accordingly, one or more damping elements can be accommodated more easily in this area of the fuel line.
  • a damping unit can be formed from one or more damping elements. This can be used in an advantageous manner as a whole, for example via end connection elements, such as connecting flanges or the like in the fuel line. But such a damping unit can also be designed as an insert or as a separately manageable unit, which is / can be mounted in an advantageous manner in the fuel line or can be inserted.
  • damping units is also advantageous in the region of branch lines of the fuel supply, wherein in the region of the branch lines due to the external conditions and the dimensions of the installation is more difficult to implement and also the damping acts directly on all injectors.
  • a damping unit can also be integrated into this main line, wherein in turn a damping unit is conceivable that via end-side connection elements in the fuel line introduced or inserted as a slot in the main line.
  • the damping unit can also be formed so that between two or more branch lines in the main line one or more damping elements and / or assemblies or bays are arranged so that it is ensured that between two or a plurality of injectors in each case a damping element is arranged and a direct pulse transmission between injectors is suppressed without damping element.
  • a damping unit with a plurality of damping elements is preferably formed so that a flow zone results between the individual damping elements, in which the partial flows are at least partially reunited.
  • At least three damping elements are provided, wherein the third damping element has at least a third, to the first and / or second different material and / or a third, the first and / or the second different structure. It has been shown that with three damping elements according to the invention, almost the entire pressure fluctuation can be damped, without appreciable or without relevant pressure loss behind the dampers according to the invention or the damping unit.
  • superposition effects or interferences can advantageously be combined with friction effects, turbulences or with dissipation or the like, or complementarily or even be mutually reinforcing used.
  • This advantageous effect or effects are enhanced or optimized in that according to the invention between the two damping elements in an advantageous manner, a boundary zone or a transition region, in particular with an effective or effective interface and / or reflection surface is generated, the / a generated to the damping effects of the two damping elements, further or third damping effect.
  • This can be realized, for example, in that two adjacent damping elements each have a contact or contact surface. This means that in this variant of the invention, these two damping elements directly abutting or touching each other or are formed standing in contact with each other.
  • a gap and / or the flow zone between two spaced damping elements is arranged in a particular embodiment of the invention, wherein the gap or the volume of the flow zone substantially between 1 and 10 cubic centimeters is. It has been found that such a volume between two damping elements, which is in particular substantially 1 cubic centimeter in size, generates a special damping effect.
  • standing waves and / or reflections and / or calmer flow conditions may advantageously form in this intermediate space.
  • the combination of the aforementioned variants is e.g. formed by curved perforated sheets, metal mesh or the like, for example, the circumference or centrally touch, but on each other surfaces (slightly) spaced and herein include a gap or cavity.
  • At least one spacer element is provided for defining the distance and / or the volume of the intermediate space between the two damping elements.
  • the size of the gap or the distance can be set exactly or fixed in particular force-locking. This is advantageous for e.g. to promote or generate the formation of standing waves and / or reflections in the gap.
  • a structural unit or damping unit can be provided with at least two damping elements, wherein between the damping elements, the spacer element is arranged and / or wherein a common sleeve or the like determines the distance between the damping elements or defined.
  • the partial flows, within the damping element at least partially communicate with each other. This has an advantageous effect on the damping.
  • At least one of the damping elements comprises a pore-forming material, in particular a sintered material, foam material, fiber material such as fleece or fabric, a bed of loose and / or at least partially fixed or glued to each other, welded individual bodies, or the like.
  • Pore-forming material By using a pore-forming material, there is an energy dissipation in the flow of the fuel fluid which is due to different effects, e.g. based on friction, throttling, etc. Pore-forming material, for example, increases the contact area of the fuel fluid with the surrounding material, resulting in significantly increased friction. In addition, a throttling effect and turbulences are achieved by a cross-sectional reduction. These and other processes provide e.g. for the desired energy dissipation, which dampens in a vibrating system.
  • Such a damping element according to the invention can be realized in different ways.
  • a chamber may be provided which is filled with pore-forming material, which is held together by suitable retaining elements, for example by sieves or the like in the chamber.
  • Another possibility is to make a body from the pore-forming material by bonding the material so that no outer wall is required to hold the pore-forming material in shape.
  • a chamber can be filled with bulk material, whereby a damping element can be realized in a simple manner.
  • bulk material is for example a fiber material or the like in question.
  • a single type of material or a mixture of different materials can be used.
  • Different particle sizes can also be used depending on the application in a mixture of bulk material.
  • a fiber material for filling a chamber for example, structures of metal fibers, such as steel wool or the like are conceivable, which can bring about the desired energy dissipation and also in an environment with very harsh operating conditions with regard to temperature, pressure or the like are usable.
  • a porous sintered body in which a granular material or granules are bonded to a body under a high pressure and at a high temperature can be used.
  • Another variant is to glue corresponding particles or grains together by introducing a corresponding adhesive as a binder in the formation of the body.
  • a felt body with fiber material which can likewise provide the dissipation according to the invention.
  • An open-pore foam can also be used, for example, as a damping body according to the invention.
  • metal foams which have similar properties to sintered bodies are also suitable here.
  • At least one of the damping elements comprises at least one perforated plate and / or at least one braid and / or a plurality of juxtaposed or interlaced strands unit such as a woven fabric, mesh, mesh, grid, sieve or the like.
  • the individual elements of a damping element such as tubes, rods, wires, braids, sheets or layers may be loosely and / or at least partially bonded or fixed, e.g. Spot welded, glued, soldered, etc., so that no outer wall is required to hold the Dämfungselement or a stack of these individual elements or damping layers in the form and / or installation.
  • At least one of the damping elements comprises at least one stack with a plurality of perforated plates designed as damping layers and / or a plurality of braids and / or a plurality of units having the strands.
  • a single type of material or even a mixture different materials are used for a damping element according to the invention.
  • different structures or individual elements such as sintered material, tube bundles, tissue and / or fiber / wire sizes can be used depending on the application in a conglomerate, mixture or a single damping element according to the invention.
  • metal fibers such as (high-grade) steel, brass, copper wire or corresponding wire ropes or the like are conceivable.
  • Corresponding materials can also be used or combined for the wires or perforated plates.
  • the desired energy dissipation can be effected hereby or, on the other hand, in an environment with very harsh operating conditions with regard to temperature, pressure or the like, these materials or embodiments can be used in an advantageous manner.
  • a porous sintered body in which a granular material or granules are bonded to a body under a high pressure and at a high temperature can be used.
  • Another variant is to glue corresponding particles or grains together by introducing a corresponding adhesive as a binder in the formation of the body.
  • a felt body with fiber material which likewise can provide the damping or dissipation according to the invention.
  • An open-pore foam can also be used, for example, as a damping body according to the invention.
  • metal foams which have similar properties to sintered bodies are also suitable here.
  • a fuel filter is also provided in the flow direction before at least one damping element, a fuel filter.
  • the fuel filter is mounted in front of the first flow-through damping element in order to retain or remove disturbing particles or contaminants before they pass into a damping element.
  • the risk of clogging a damping element is reduced or completely avoided.
  • such a fuel filter can also already be arranged upstream of the pressure generator in the flow direction.
  • a pulsation damping according to the invention can advantageously be combined with one or more surge tanks.
  • One or more surge tanks communicating with the fuel line can provide as constant a pressure as possible in the fuel line.
  • Such surge tank which usually have a membrane or a piston which separates liquid and thus largely incompressible pressurized fuel fluid from a chamber in which a compressible medium, usually a gaseous fluid, such as air or the like pressurized is arranged, for example, can compensate for fluctuations in a fuel pump.
  • a surge tank can further improve the pulsation damping.
  • a fuel line 1 according to FIG. 1 comprises a main line 2, branch off from the various branch lines 3.
  • Each branch line 3, 4, 5, 6 serves to supply fuel to an injector of an internal combustion engine.
  • the main line 2 can be extended at its end no longer shown in the drawing, so that any further number of branch lines can follow.
  • each branch line 3 4, 5, 6, a damping element 7, 8 is used, which is flowed through by the fuel stream. Due to the advantageous, in particular (different) stacked construction of the damping elements, the o. A. Energy dissipation and thus also the particularly advantageous pulsation damping allows.
  • a damping unit 11 which is inserted into the main line 2.
  • a damping unit 11 that it can be handled separately in an advantageous manner and, for example, independently of other components can be tested or tested and finally installed or assembled in the Brennstpoffsystem and possibly dismantled or again at Need can be exchanged.
  • a total length L D of the damping unit 11, 21, but above all a distance A between two adjacent damping elements or stack 17, 18, 19, 20 and thus at a given pipe inner diameter of the assembly 11, 21 corresponding to a distance volume V exactly adjustable. This is for the attenuation or the setting of the frequencies to be attenuated or of the frequency spectrum to be attenuated special meaning.
  • a diameter D (see. FIG. 3 ) of openings 28 and pores 28 and capillaries 28 for the damping effect of importance.
  • damping unit 11, 21 In a further variant of the invention, e.g. certainly also three or four damping elements 17, 18, 19, 20 are integrated or mounted in a damping unit 11, 21.
  • the total length L D of the damping unit 11, 21 is twice as long as the length of the interior space from an injector nozzle to the injector outlet.
  • the volume V is (at least) about 1 cubic centimeter in size.
  • a length L of the damping element or stack 17, 18, 19, 20 is preferably about 2 to 50 millimeters in size.
  • the damping unit 11 comprises an axially flow-through pipe, which is separated at different points, so that at these points, a radial flow is possible. Shown in the tube 12 of the damping unit 11 by way of example three radial openings, which serve the inflow or outflow of fuel fluid.
  • the radial openings 13, 14 are in communication with the branch pipes 5, 6, so that fuel fluid from the inside of the pipe 12 of the damping unit 11 can flow in these branch pipes in the radial direction.
  • the radial opening 15 is in communication with a supply line 16 which is connected to a pressure generator, not shown.
  • damping elements 17, 18, which are preferably constructed as a stack 20 of a plurality of perforated plates 48 and / or (ordered) braid layers or fabric layers 47.
  • FIG. 8 is schematically illustrated such a layering in two different variants.
  • FIG. 8a an ordered layering of eg perforated plates 48 or fabrics 47 is shown.
  • the openings 28 or pores 28 are arranged substantially one above the other or in such a way that (almost rectilinear) Channels are generated.
  • FIG. 8a an ordered layering of eg perforated plates 48 or fabrics 47 is shown.
  • the openings 28 or pores 28 are arranged substantially one above the other or in such a way that (almost rectilinear) Channels are generated.
  • the layers or layers or damping layers are arranged offset (transversely) in such a way that the fuel fluid does not have to flow through in a straight line but rather through a very branched pore system through the damping element or the stack 20. Accordingly, the effective channel path increases in comparison to the straight-line flow according to FIG. 8a ,
  • damping elements can be used for example in a so-called common rail system.
  • the fuel is fed via the pressure generator through the supply line 16 into the main line 2 and can propagate there in both axial directions of the main line 2.
  • the fuel flows through a respective damping element 17, 18, wherein the energy dissipation occurs and pulsations are damped.
  • branch off branch lines 3, 4, 5, 6, which serve to supply fuel fluid to the individual injectors or cylinders of an internal combustion engine.
  • the damping elements 7, 8, 9, 10 in these branch lines 3, 4, 5, 6 are in turn stacked according to the invention and in particular stacked to cause the energy dissipation, which acts to damp pulsations.
  • Damping elements are housed both in the main line and in the branch lines. Since the fuel supply is to be regarded as an overall system, depending on the application, a sufficient damping can already be achieved with arrangements in which damping elements are arranged only in the main line or only in the branch lines.
  • FIG. 2 shows a variant in which a damping unit 21 is inserted as a slot in a fuel line 22, comprising two damping elements 23, 24, between which a gap 25 is formed as a flow zone without a perforated plate and / or a braid / fabric.
  • the stack 19, 20 indicated by a plurality of perforated plates and / or braid / fabric layers.
  • the damping elements 23, 24 are mounted in a support tube 26, so that the damping unit 21 can be handled as a complete unit.
  • a damping unit according to FIG. 2 For example, instead of the damping elements in FIG. 1 be used.
  • the combination of two damping elements 23, 24 with the intermediate space 25 has already shown an improved damping effect compared to the pure accumulation of the damping effect of the individual damping elements 23, 24.
  • the execution according to FIG. 2 can be further expanded to the effect that further damping elements and other spaces are combined in one unit.
  • FIG. 3 shows a section of a Lohblech 27 with a circular cross section, wherein numerous holes 28 are provided. These holes 28 can be drilled, stamped, lasered or made comparable. As a stack 20 (see, eg Fig. 4 ) is advantageous if the holes 28 are at least partially offset in the transverse direction to the perforated plate 27 and to the flow direction of the fluid or overlap only partially.
  • FIG. 4 shows a principle according to the embodiment according to FIG. 2 corresponding variant of a damping element 29 with a multilayer stack 20.
  • the damping element 29 is directly usable in an injector.
  • a large central bore 30, which can be penetrated by a needle of a needle valve of an injector.
  • FIG. 5 shows a schematic representation of such an injector 31.
  • the injector 31 shows a nozzle housing 32 with a nozzle opening 33.
  • a fuel line 34 into which a damping element 29 according to FIG. 4 is used.
  • the damping element 29 is penetrated by a nozzle needle 35 which can seal with its tip 36 against a valve seat 37 and the Nozzle opening 33 closes or opens.
  • the injector can control the injection process by axial movement of the nozzle needle 35 both in terms of the time course and thereby also with regard to the injected fuel volume.
  • the fuel flow through the damping element 29 experiences an energy dissipation.
  • the central bore 30 of the annular damping element 29 is thereby closed by the nozzle needle 35 so that only the path through stack 20 remains for the fuel fluid.
  • the damping effect according to the invention is generated directly at the point of origin of the pulsation in the vicinity of the nozzle opening 33.
  • annular damping elements 29 may in multiple versions with gaps corresponding to the gap 25 according to the embodiment according to FIG. 3 can be used to further increase the damping effect.
  • FIG. 6 shows a further embodiment of a damping element 17, 18. It comprises a base body in which many small longitudinal bores 28 are mounted. The longitudinal bores 28 are formed continuously. In each longitudinal bore 28 may therefore form a partial flow, which contributes to the invention damping.
  • damping elements for example, with a damping element 17 according to FIG. 2 partly replaced or combined used.
  • FIG. 7 shows a schematic representation of a common rail system 38 with a commonly referred to as "common rail" main line 39, from the two branch lines 40, 41 depart in the illustrated case.
  • the branch lines 40, 41 lead to injectors 42, 43.
  • the injector 42 is in operation, as indicated by dashed lines, which are intended to represent sprays of injected fuel.
  • Damping units 45, 46 according to the invention are arranged upstream of the injectors 42, 43.
  • the damping units can be used as simple, preferably stacked or multi-layer damping elements, such as the damping element according to FIG. 4 or 6 or 8 or as a multi-stage, in particular two-stage damping unit according to the damping unit 21 according to the embodiment according to FIG. 2 be educated.
  • the arrangement of the damping units 45, 46 leads as well as an integration of a damping element in the injector, as in the embodiment according to FIG. 7 is provided with the damping element 29, to the fact that pulsations that are triggered by an injector, can be largely decoupled from the overall system.
  • the injector 42 is active, ie it triggers corresponding pulsations, which are, however, largely attenuated in the damping unit 45, so that the total system located upstream of the damping unit 45 in the flow direction is largely uncoupled from the pulsations of the injector 42.
  • This means that in the temporal sequence of the injector 43 can be operated without being affected by previously caused by the injector 42 pulsations.
  • a more accurate metering of fuel in particular with regard to the injection pressure and the metered amount is possible.
  • damping elements and damping arrangements possible.
  • a construction according to FIG. 3 can also be flexible. Fibers are achieved, both variants with fibers of solid material and hollow fibers are conceivable. These are in FIG. 9 further variants shown.
  • FIG. 9 Variants shown for example, have individual openings 28 or capillary 28 or channels 28, which can also be joined together to capillary bundles.
  • the capillary is produced by mechanical processing (for example drilling, erosion, lasers), by forming (for example, large tubes are rolled and drawn until they reach the desired diameter), are formed in the original way (for example by casting, injection molding) or built ( eg by layers of several perforated plates / sheets).
  • the individual capillaries 28 can be connected to one another to form a bundle by being welded or glued to the contact surfaces ( FIG. 9 a) or with a fuel-resistant material 99 (Ex: PPE, Lauramid) are cast ( FIG. 9 b) ,
  • a carrier sleeve 12 or tube 12 (FIG. FIG. 9c) in which the individual capillary 28 or tubes 28 are introduced, can also be used.
  • the volume can be adjusted in special cases by a spacer sleeve.
  • a bundle of solid tubes or wire 98 or the like (US Pat. FIG. 9 d) be used.
  • holes 28 can be etched in plates 27 to produce perforated plates, which then stacked on each other in an advantageous manner, possibly again give a capillary bundle.
  • long channels / lines can be etched along the surface of a plate. If you place two of these plates with the etched side together, you will also get capillaries. Thus, various combinations of the production methods with one another are also conceivable for the production of capillaries.
  • capillaries can be generated by nanotubes and microstructures.
  • the advantageous diameter of a pore or capillary is 10 .mu.m-40 .mu.m in order to advantageously avoid contamination or clogging and to achieve good damping.
  • both similar, preferably (different) stacked as well as various damping elements, such as fabric combined with grid and / or tube bundles or perforated plates, are combined in one device.
  • FIG. 10 something illustrated.
  • FIG. 10a shows a Durckverlauf without damping elements and FIG. 10b with damping.
  • FIG. 10a The fast closing of the injector after the injection process generates pressure pulsations ( FIG. 10a ) These are transmitted through the fluid in the rail or pipe. If several injectors are connected to the same line or rail, they also experience the pressure pulsations from the closing injector. The generated pressure pulsations behave similarly to a sinusoidal oscillation. Depending on the time interval, a wide variety of pressures are thus present in front of the injector injector, which makes precise, reproducible minimum quantity injection impossible in order to reduce pollutant emissions ( FIG. 11 ).
  • An advantageous damping element preferably between the pressure generator and the injection opening of an injector is provided according to a variant of the invention in an advantageous manner, wherein the fuel flow is divided by the damping element, esp.
  • the damping element esp.
  • the tissue pores and / or holes of the perforated plates in a plurality of part streams and wherein in the flow direction behind the damping element, the partial flows at least partially are reunited.
  • an increased energy dissipation is realized in the damping element, which can be based on different effects.
  • friction and throttle effects play a role.
  • the contact area and the contact time of the fuel fluid with the wall regions of the damping element and thus also the friction are significantly increased by the inventive division of the total flow of the fuel fluid.
  • a damping element or a damping unit which / divides the fuel into a plurality of partial flows and reunited after the damping element and / or at least two mutually spaced damping elements are provided, wherein there is a flow zone in which the partial flows reunite.
  • damping units with combinations of ordered wire mesh and / or bulk material and / or wire mesh, in this case, the number of any layer / layer can be varied as desired.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Prostheses (AREA)

Claims (18)

  1. Dispositif permettant d'injecter un fluide combustible sous pression dans une chambre de combustion, comportant un générateur de pression, au moins un injecteur, muni d'un orifice d'injection, et une conduite de combustible entre le générateur de pression et l'injecteur, il est prévu au moins un élément amortisseur destiné à réduire les ondes de pression du fluide combustible entre le générateur de pression et l'orifice d'injection de l'injecteur, ledit élément amortisseur comportant plusieurs voies d'écoulement avec une surface de section transversale moyenne avec un diamètre, librement traversable, et/ou avec des pores avec un diamètre, librement traversables, caractérisé en ce qu'une longueur de l'élément amortisseur, orientée dans la direction d'écoulement du fluide combustible, mesure sensiblement entre 1 et 100 millimètres, et en ce qu'un rapport entre un diamètre de la surface de section transversale et/ou un diamètre des pores et la longueur de l'élément amortisseur, orientée dans la direction d'écoulement du fluide combustible, se situe sensiblement entre 2 et 5 micromètres par millimètre.
  2. Dispositif selon la revendication 1, caractérisé en ce qu'un diamètre de la surface de section transversale et/ou un diamètre des pores mesure sensiblement entre 5 et 200 micromètres.
  3. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que la longueur de l'élément amortisseur, orientée dans la direction d'écoulement du fluide combustible, mesure sensiblement entre 2 et 50 millimètres.
  4. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un diamètre de la surface de section transversale et/ou un diamètre des pores mesure sensiblement entre 10 et 100 micromètres.
  5. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un diamètre de la surface de section transversale et/ou un diamètre des pores mesure sensiblement 10 micromètres et la longueur de l'élément amortisseur, orientée dans la direction d'écoulement du fluide combustible, mesure sensiblement 2 millimètres.
  6. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un diamètre de la surface de section transversale et/ou un diamètre des pores mesure sensiblement 100 micromètres et la longueur de l'élément amortisseur, orientée dans la direction d'écoulement du fluide combustible, mesure sensiblement 50 millimètres.
  7. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que le flux de combustible à travers l'élément amortisseur (7) peut être divisé en une pluralité de flux partiels, lesdits flux partiels étant à nouveau réunis au moins partiellement en aval de l'élément amortisseur (7) par référence à la direction d'écoulement.
  8. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il est prévu au moins deux éléments amortisseurs (23, 24) écartés l'un de l'autre, une zone d'écoulement étant située entre ceux-ci, dans laquelle les flux partiels sont à nouveau réunis au moins partiellement.
  9. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'entre deux éléments amortisseurs (23, 24), écartés l'un de l'autre, est disposé un espace intermédiaire et/ou la zone d'écoulement, ledit espace intermédiaire ou le volume de ladite zone d'écoulement mesurant sensiblement entre 1 et 10 cm3.
  10. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que les flux partiels communiquent entre eux au moins partiellement à l'intérieur de l'élément amortisseur.
  11. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément amortisseur contient un faisceau d'éléments allongés (27) qui, sous forme de corps creux et/ou par des espaces intermédiaires entre les corps creux et/ou des corps pleins, comportent des conduits d'écoulement (28) pour les flux partiels.
  12. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément amortisseur (17, 18) comporte un matériau (19, 20) formant des pores.
  13. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément amortisseur (17, 18) comporte au moins une tôle perforée et/ou au moins un treillis et/ou une unité comportant plusieurs brins juxtaposés ou entrelacés.
  14. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément amortisseur comporte au moins une pile avec plusieurs tôles perforées réalisées sous forme de couches d'amortissement, et/ou plusieurs treillis et/ou plusieurs unités comportant les brins.
  15. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il est prévu au moins une unité d'amortissement manoeuvrable séparément, munie d'au moins deux éléments amortisseurs (23, 24) écartés l'un de l'autre, un espace intermédiaire (25) étant situé entre les deux éléments amortisseurs (23, 24).
  16. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'unité d'amortissement manoeuvrable séparément comporte au moins un écarteur permettant de définir la distance et/ou le volume de l'espace intermédiaire (25) entre les deux éléments amortisseurs (23, 24).
  17. Unité d'amortissement destinée à être utilisée dans un dispositif selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu au moins deux éléments amortisseurs (23, 24) écartés l'un de l'autre, un espace intermédiaire (25) étant disposé entre les deux éléments amortisseurs (23, 24).
  18. Unité d'injection pour un dispositif selon la revendication 1, caractérisée en ce qu'il est prévu un injecteur et une unité d'amortissement selon la revendication précédente, disposée en amont dudit injecteur.
EP20110009811 2010-12-15 2011-12-14 Amortisseur de pulsations Not-in-force EP2466112B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102010054674 2010-12-15
DE102010054675 2010-12-15
DE102011116274 2011-10-19

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EP2466112A2 EP2466112A2 (fr) 2012-06-20
EP2466112A3 EP2466112A3 (fr) 2013-05-29
EP2466112B1 true EP2466112B1 (fr) 2014-09-03

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EP11009813.4A Not-in-force EP2466116B1 (fr) 2010-12-15 2011-12-14 Amortisseur de pulsations
EP20110009812 Not-in-force EP2466113B1 (fr) 2010-12-15 2011-12-14 Amortisseur de pulsations
EP20110009811 Not-in-force EP2466112B1 (fr) 2010-12-15 2011-12-14 Amortisseur de pulsations

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EP11009813.4A Not-in-force EP2466116B1 (fr) 2010-12-15 2011-12-14 Amortisseur de pulsations
EP20110009812 Not-in-force EP2466113B1 (fr) 2010-12-15 2011-12-14 Amortisseur de pulsations

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EP (3) EP2466116B1 (fr)
DE (3) DE102011120944A1 (fr)
ES (3) ES2509942T3 (fr)
HU (1) HUE024519T2 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2468118A1 (fr) 2010-12-24 2012-06-27 Philip Morris Products S.A. Système de génération d'aérosol afin de désactiver un consommable
DE102012220661A1 (de) * 2012-11-13 2014-05-15 Robert Bosch Gmbh Brennstoffverteiler, insbesondere Brennstoffverteilerleiste für gemischverdichtende, fremdgezündete Brennkraftmaschinen
DE102013003104A1 (de) * 2013-02-25 2014-08-28 L'orange Gmbh Krafftstoffinjektor
US9644589B2 (en) * 2013-11-20 2017-05-09 Stanadyne Llc Debris diverter shield for fuel injector
DE102015220550A1 (de) * 2015-10-21 2017-04-27 Ford Global Technologies, Llc Kraftstoffeinspritzdüse
DE102016209423A1 (de) * 2016-05-31 2017-11-30 Robert Bosch Gmbh Hochdruckspeicher und Verfahren zur Herstellung eines Hochdruckspeichers
EP3502461A1 (fr) * 2017-12-20 2019-06-26 Continental Automotive GmbH Passage de distribution de carburant pour système d'injection de carburant et procédé de fabrication d'un passage de distribution de carburant
EP3670895B1 (fr) * 2018-12-20 2023-10-18 Vitesco Technologies GmbH Ensemble de rampe de carburant pour un système d'injection de carburant d'un moteur à combustion interne
DE102019103041B4 (de) * 2019-02-07 2022-12-29 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Sammeldruckleitung für ein Kraftstoffeinspritzsystem einer Verbrennungskraftmaschine
EP3805547A1 (fr) * 2019-10-08 2021-04-14 Vitesco Technologies GmbH Système d'injection de carburant et procédé de fabrication d'un ensemble de rampe à carburant

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US4356091A (en) 1980-10-06 1982-10-26 Caterpillar Tractor Co. Filtering and dampening apparatus
DE19516358C1 (de) 1995-05-04 1996-08-22 Daimler Benz Ag Pulsationsdämpfer für Kraftstoff im Kraftstoffversorgungssystem einer Brennkraftmaschine
DE10226004A1 (de) * 2002-06-12 2004-01-08 Robert Bosch Gmbh Kraftstoffeinspritzsystem mit einem Festkörperdämpfungselement
DE10247775B4 (de) 2002-10-14 2005-12-29 Siemens Ag Speichereinspritzsystem zur Dämpfung von Druckwellen, insbesondere bei einem Common Rail Einspritzsystem
US7093584B1 (en) * 2005-08-19 2006-08-22 Delphi Technologies, Inc. Fuel injector noise mufflers
DE102006054178A1 (de) * 2006-11-16 2008-05-21 Robert Bosch Gmbh Kraftstoffeinspritzsystem für eine Brennkraftmaschine mit druckschwingungsgedämpfter Kraftstoffrücklaufleitung
US7942132B2 (en) * 2008-07-17 2011-05-17 Robert Bosch Gmbh In-line noise filtering device for fuel system

Also Published As

Publication number Publication date
DE102011120944A1 (de) 2012-06-21
EP2466116B1 (fr) 2014-07-30
EP2466112A2 (fr) 2012-06-20
EP2466113B1 (fr) 2014-12-17
EP2466116A2 (fr) 2012-06-20
DE102011120924A1 (de) 2012-06-21
EP2466116A3 (fr) 2013-05-29
EP2466113A3 (fr) 2013-05-29
ES2531313T3 (es) 2015-03-12
ES2525294T3 (es) 2014-12-19
ES2509942T3 (es) 2014-10-20
EP2466113A2 (fr) 2012-06-20
DE102011120945A1 (de) 2012-06-21
HUE024519T2 (en) 2016-01-28
EP2466112A3 (fr) 2013-05-29

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